xref: /linux/arch/s390/kvm/kvm-s390.c (revision 42422993cf28d456778ee9168d73758ec037cd51)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * hosting IBM Z kernel virtual machines (s390x)
4  *
5  * Copyright IBM Corp. 2008, 2020
6  *
7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
8  *               Christian Borntraeger <borntraeger@de.ibm.com>
9  *               Christian Ehrhardt <ehrhardt@de.ibm.com>
10  *               Jason J. Herne <jjherne@us.ibm.com>
11  */
12 
13 #define KMSG_COMPONENT "kvm-s390"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15 
16 #include <linux/compiler.h>
17 #include <linux/err.h>
18 #include <linux/fs.h>
19 #include <linux/hrtimer.h>
20 #include <linux/init.h>
21 #include <linux/kvm.h>
22 #include <linux/kvm_host.h>
23 #include <linux/mman.h>
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/random.h>
27 #include <linux/slab.h>
28 #include <linux/timer.h>
29 #include <linux/vmalloc.h>
30 #include <linux/bitmap.h>
31 #include <linux/sched/signal.h>
32 #include <linux/string.h>
33 #include <linux/pgtable.h>
34 #include <linux/mmu_notifier.h>
35 
36 #include <asm/asm-offsets.h>
37 #include <asm/lowcore.h>
38 #include <asm/stp.h>
39 #include <asm/gmap.h>
40 #include <asm/nmi.h>
41 #include <asm/switch_to.h>
42 #include <asm/isc.h>
43 #include <asm/sclp.h>
44 #include <asm/cpacf.h>
45 #include <asm/timex.h>
46 #include <asm/ap.h>
47 #include <asm/uv.h>
48 #include <asm/fpu/api.h>
49 #include "kvm-s390.h"
50 #include "gaccess.h"
51 #include "pci.h"
52 
53 #define CREATE_TRACE_POINTS
54 #include "trace.h"
55 #include "trace-s390.h"
56 
57 #define MEM_OP_MAX_SIZE 65536	/* Maximum transfer size for KVM_S390_MEM_OP */
58 #define LOCAL_IRQS 32
59 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
60 			   (KVM_MAX_VCPUS + LOCAL_IRQS))
61 
62 const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
63 	KVM_GENERIC_VM_STATS(),
64 	STATS_DESC_COUNTER(VM, inject_io),
65 	STATS_DESC_COUNTER(VM, inject_float_mchk),
66 	STATS_DESC_COUNTER(VM, inject_pfault_done),
67 	STATS_DESC_COUNTER(VM, inject_service_signal),
68 	STATS_DESC_COUNTER(VM, inject_virtio),
69 	STATS_DESC_COUNTER(VM, aen_forward),
70 	STATS_DESC_COUNTER(VM, gmap_shadow_reuse),
71 	STATS_DESC_COUNTER(VM, gmap_shadow_create),
72 	STATS_DESC_COUNTER(VM, gmap_shadow_r1_entry),
73 	STATS_DESC_COUNTER(VM, gmap_shadow_r2_entry),
74 	STATS_DESC_COUNTER(VM, gmap_shadow_r3_entry),
75 	STATS_DESC_COUNTER(VM, gmap_shadow_sg_entry),
76 	STATS_DESC_COUNTER(VM, gmap_shadow_pg_entry),
77 };
78 
79 const struct kvm_stats_header kvm_vm_stats_header = {
80 	.name_size = KVM_STATS_NAME_SIZE,
81 	.num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
82 	.id_offset = sizeof(struct kvm_stats_header),
83 	.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
84 	.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
85 		       sizeof(kvm_vm_stats_desc),
86 };
87 
88 const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
89 	KVM_GENERIC_VCPU_STATS(),
90 	STATS_DESC_COUNTER(VCPU, exit_userspace),
91 	STATS_DESC_COUNTER(VCPU, exit_null),
92 	STATS_DESC_COUNTER(VCPU, exit_external_request),
93 	STATS_DESC_COUNTER(VCPU, exit_io_request),
94 	STATS_DESC_COUNTER(VCPU, exit_external_interrupt),
95 	STATS_DESC_COUNTER(VCPU, exit_stop_request),
96 	STATS_DESC_COUNTER(VCPU, exit_validity),
97 	STATS_DESC_COUNTER(VCPU, exit_instruction),
98 	STATS_DESC_COUNTER(VCPU, exit_pei),
99 	STATS_DESC_COUNTER(VCPU, halt_no_poll_steal),
100 	STATS_DESC_COUNTER(VCPU, instruction_lctl),
101 	STATS_DESC_COUNTER(VCPU, instruction_lctlg),
102 	STATS_DESC_COUNTER(VCPU, instruction_stctl),
103 	STATS_DESC_COUNTER(VCPU, instruction_stctg),
104 	STATS_DESC_COUNTER(VCPU, exit_program_interruption),
105 	STATS_DESC_COUNTER(VCPU, exit_instr_and_program),
106 	STATS_DESC_COUNTER(VCPU, exit_operation_exception),
107 	STATS_DESC_COUNTER(VCPU, deliver_ckc),
108 	STATS_DESC_COUNTER(VCPU, deliver_cputm),
109 	STATS_DESC_COUNTER(VCPU, deliver_external_call),
110 	STATS_DESC_COUNTER(VCPU, deliver_emergency_signal),
111 	STATS_DESC_COUNTER(VCPU, deliver_service_signal),
112 	STATS_DESC_COUNTER(VCPU, deliver_virtio),
113 	STATS_DESC_COUNTER(VCPU, deliver_stop_signal),
114 	STATS_DESC_COUNTER(VCPU, deliver_prefix_signal),
115 	STATS_DESC_COUNTER(VCPU, deliver_restart_signal),
116 	STATS_DESC_COUNTER(VCPU, deliver_program),
117 	STATS_DESC_COUNTER(VCPU, deliver_io),
118 	STATS_DESC_COUNTER(VCPU, deliver_machine_check),
119 	STATS_DESC_COUNTER(VCPU, exit_wait_state),
120 	STATS_DESC_COUNTER(VCPU, inject_ckc),
121 	STATS_DESC_COUNTER(VCPU, inject_cputm),
122 	STATS_DESC_COUNTER(VCPU, inject_external_call),
123 	STATS_DESC_COUNTER(VCPU, inject_emergency_signal),
124 	STATS_DESC_COUNTER(VCPU, inject_mchk),
125 	STATS_DESC_COUNTER(VCPU, inject_pfault_init),
126 	STATS_DESC_COUNTER(VCPU, inject_program),
127 	STATS_DESC_COUNTER(VCPU, inject_restart),
128 	STATS_DESC_COUNTER(VCPU, inject_set_prefix),
129 	STATS_DESC_COUNTER(VCPU, inject_stop_signal),
130 	STATS_DESC_COUNTER(VCPU, instruction_epsw),
131 	STATS_DESC_COUNTER(VCPU, instruction_gs),
132 	STATS_DESC_COUNTER(VCPU, instruction_io_other),
133 	STATS_DESC_COUNTER(VCPU, instruction_lpsw),
134 	STATS_DESC_COUNTER(VCPU, instruction_lpswe),
135 	STATS_DESC_COUNTER(VCPU, instruction_pfmf),
136 	STATS_DESC_COUNTER(VCPU, instruction_ptff),
137 	STATS_DESC_COUNTER(VCPU, instruction_sck),
138 	STATS_DESC_COUNTER(VCPU, instruction_sckpf),
139 	STATS_DESC_COUNTER(VCPU, instruction_stidp),
140 	STATS_DESC_COUNTER(VCPU, instruction_spx),
141 	STATS_DESC_COUNTER(VCPU, instruction_stpx),
142 	STATS_DESC_COUNTER(VCPU, instruction_stap),
143 	STATS_DESC_COUNTER(VCPU, instruction_iske),
144 	STATS_DESC_COUNTER(VCPU, instruction_ri),
145 	STATS_DESC_COUNTER(VCPU, instruction_rrbe),
146 	STATS_DESC_COUNTER(VCPU, instruction_sske),
147 	STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock),
148 	STATS_DESC_COUNTER(VCPU, instruction_stsi),
149 	STATS_DESC_COUNTER(VCPU, instruction_stfl),
150 	STATS_DESC_COUNTER(VCPU, instruction_tb),
151 	STATS_DESC_COUNTER(VCPU, instruction_tpi),
152 	STATS_DESC_COUNTER(VCPU, instruction_tprot),
153 	STATS_DESC_COUNTER(VCPU, instruction_tsch),
154 	STATS_DESC_COUNTER(VCPU, instruction_sie),
155 	STATS_DESC_COUNTER(VCPU, instruction_essa),
156 	STATS_DESC_COUNTER(VCPU, instruction_sthyi),
157 	STATS_DESC_COUNTER(VCPU, instruction_sigp_sense),
158 	STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running),
159 	STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call),
160 	STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency),
161 	STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency),
162 	STATS_DESC_COUNTER(VCPU, instruction_sigp_start),
163 	STATS_DESC_COUNTER(VCPU, instruction_sigp_stop),
164 	STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status),
165 	STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status),
166 	STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status),
167 	STATS_DESC_COUNTER(VCPU, instruction_sigp_arch),
168 	STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix),
169 	STATS_DESC_COUNTER(VCPU, instruction_sigp_restart),
170 	STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset),
171 	STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset),
172 	STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown),
173 	STATS_DESC_COUNTER(VCPU, instruction_diagnose_10),
174 	STATS_DESC_COUNTER(VCPU, instruction_diagnose_44),
175 	STATS_DESC_COUNTER(VCPU, instruction_diagnose_9c),
176 	STATS_DESC_COUNTER(VCPU, diag_9c_ignored),
177 	STATS_DESC_COUNTER(VCPU, diag_9c_forward),
178 	STATS_DESC_COUNTER(VCPU, instruction_diagnose_258),
179 	STATS_DESC_COUNTER(VCPU, instruction_diagnose_308),
180 	STATS_DESC_COUNTER(VCPU, instruction_diagnose_500),
181 	STATS_DESC_COUNTER(VCPU, instruction_diagnose_other),
182 	STATS_DESC_COUNTER(VCPU, pfault_sync)
183 };
184 
185 const struct kvm_stats_header kvm_vcpu_stats_header = {
186 	.name_size = KVM_STATS_NAME_SIZE,
187 	.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
188 	.id_offset = sizeof(struct kvm_stats_header),
189 	.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
190 	.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
191 		       sizeof(kvm_vcpu_stats_desc),
192 };
193 
194 /* allow nested virtualization in KVM (if enabled by user space) */
195 static int nested;
196 module_param(nested, int, S_IRUGO);
197 MODULE_PARM_DESC(nested, "Nested virtualization support");
198 
199 /* allow 1m huge page guest backing, if !nested */
200 static int hpage;
201 module_param(hpage, int, 0444);
202 MODULE_PARM_DESC(hpage, "1m huge page backing support");
203 
204 /* maximum percentage of steal time for polling.  >100 is treated like 100 */
205 static u8 halt_poll_max_steal = 10;
206 module_param(halt_poll_max_steal, byte, 0644);
207 MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling");
208 
209 /* if set to true, the GISA will be initialized and used if available */
210 static bool use_gisa  = true;
211 module_param(use_gisa, bool, 0644);
212 MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it.");
213 
214 /* maximum diag9c forwarding per second */
215 unsigned int diag9c_forwarding_hz;
216 module_param(diag9c_forwarding_hz, uint, 0644);
217 MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off");
218 
219 /*
220  * allow asynchronous deinit for protected guests; enable by default since
221  * the feature is opt-in anyway
222  */
223 static int async_destroy = 1;
224 module_param(async_destroy, int, 0444);
225 MODULE_PARM_DESC(async_destroy, "Asynchronous destroy for protected guests");
226 
227 /*
228  * For now we handle at most 16 double words as this is what the s390 base
229  * kernel handles and stores in the prefix page. If we ever need to go beyond
230  * this, this requires changes to code, but the external uapi can stay.
231  */
232 #define SIZE_INTERNAL 16
233 
234 /*
235  * Base feature mask that defines default mask for facilities. Consists of the
236  * defines in FACILITIES_KVM and the non-hypervisor managed bits.
237  */
238 static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM };
239 /*
240  * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL
241  * and defines the facilities that can be enabled via a cpu model.
242  */
243 static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL };
244 
245 static unsigned long kvm_s390_fac_size(void)
246 {
247 	BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64);
248 	BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64);
249 	BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) >
250 		sizeof(stfle_fac_list));
251 
252 	return SIZE_INTERNAL;
253 }
254 
255 /* available cpu features supported by kvm */
256 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
257 /* available subfunctions indicated via query / "test bit" */
258 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
259 
260 static struct gmap_notifier gmap_notifier;
261 static struct gmap_notifier vsie_gmap_notifier;
262 debug_info_t *kvm_s390_dbf;
263 debug_info_t *kvm_s390_dbf_uv;
264 
265 /* Section: not file related */
266 /* forward declarations */
267 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
268 			      unsigned long end);
269 static int sca_switch_to_extended(struct kvm *kvm);
270 
271 static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta)
272 {
273 	u8 delta_idx = 0;
274 
275 	/*
276 	 * The TOD jumps by delta, we have to compensate this by adding
277 	 * -delta to the epoch.
278 	 */
279 	delta = -delta;
280 
281 	/* sign-extension - we're adding to signed values below */
282 	if ((s64)delta < 0)
283 		delta_idx = -1;
284 
285 	scb->epoch += delta;
286 	if (scb->ecd & ECD_MEF) {
287 		scb->epdx += delta_idx;
288 		if (scb->epoch < delta)
289 			scb->epdx += 1;
290 	}
291 }
292 
293 /*
294  * This callback is executed during stop_machine(). All CPUs are therefore
295  * temporarily stopped. In order not to change guest behavior, we have to
296  * disable preemption whenever we touch the epoch of kvm and the VCPUs,
297  * so a CPU won't be stopped while calculating with the epoch.
298  */
299 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
300 			  void *v)
301 {
302 	struct kvm *kvm;
303 	struct kvm_vcpu *vcpu;
304 	unsigned long i;
305 	unsigned long long *delta = v;
306 
307 	list_for_each_entry(kvm, &vm_list, vm_list) {
308 		kvm_for_each_vcpu(i, vcpu, kvm) {
309 			kvm_clock_sync_scb(vcpu->arch.sie_block, *delta);
310 			if (i == 0) {
311 				kvm->arch.epoch = vcpu->arch.sie_block->epoch;
312 				kvm->arch.epdx = vcpu->arch.sie_block->epdx;
313 			}
314 			if (vcpu->arch.cputm_enabled)
315 				vcpu->arch.cputm_start += *delta;
316 			if (vcpu->arch.vsie_block)
317 				kvm_clock_sync_scb(vcpu->arch.vsie_block,
318 						   *delta);
319 		}
320 	}
321 	return NOTIFY_OK;
322 }
323 
324 static struct notifier_block kvm_clock_notifier = {
325 	.notifier_call = kvm_clock_sync,
326 };
327 
328 static void allow_cpu_feat(unsigned long nr)
329 {
330 	set_bit_inv(nr, kvm_s390_available_cpu_feat);
331 }
332 
333 static inline int plo_test_bit(unsigned char nr)
334 {
335 	unsigned long function = (unsigned long)nr | 0x100;
336 	int cc;
337 
338 	asm volatile(
339 		"	lgr	0,%[function]\n"
340 		/* Parameter registers are ignored for "test bit" */
341 		"	plo	0,0,0,0(0)\n"
342 		"	ipm	%0\n"
343 		"	srl	%0,28\n"
344 		: "=d" (cc)
345 		: [function] "d" (function)
346 		: "cc", "0");
347 	return cc == 0;
348 }
349 
350 static __always_inline void __insn32_query(unsigned int opcode, u8 *query)
351 {
352 	asm volatile(
353 		"	lghi	0,0\n"
354 		"	lgr	1,%[query]\n"
355 		/* Parameter registers are ignored */
356 		"	.insn	rrf,%[opc] << 16,2,4,6,0\n"
357 		:
358 		: [query] "d" ((unsigned long)query), [opc] "i" (opcode)
359 		: "cc", "memory", "0", "1");
360 }
361 
362 #define INSN_SORTL 0xb938
363 #define INSN_DFLTCC 0xb939
364 
365 static void __init kvm_s390_cpu_feat_init(void)
366 {
367 	int i;
368 
369 	for (i = 0; i < 256; ++i) {
370 		if (plo_test_bit(i))
371 			kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
372 	}
373 
374 	if (test_facility(28)) /* TOD-clock steering */
375 		ptff(kvm_s390_available_subfunc.ptff,
376 		     sizeof(kvm_s390_available_subfunc.ptff),
377 		     PTFF_QAF);
378 
379 	if (test_facility(17)) { /* MSA */
380 		__cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
381 			      kvm_s390_available_subfunc.kmac);
382 		__cpacf_query(CPACF_KMC, (cpacf_mask_t *)
383 			      kvm_s390_available_subfunc.kmc);
384 		__cpacf_query(CPACF_KM, (cpacf_mask_t *)
385 			      kvm_s390_available_subfunc.km);
386 		__cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
387 			      kvm_s390_available_subfunc.kimd);
388 		__cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
389 			      kvm_s390_available_subfunc.klmd);
390 	}
391 	if (test_facility(76)) /* MSA3 */
392 		__cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
393 			      kvm_s390_available_subfunc.pckmo);
394 	if (test_facility(77)) { /* MSA4 */
395 		__cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
396 			      kvm_s390_available_subfunc.kmctr);
397 		__cpacf_query(CPACF_KMF, (cpacf_mask_t *)
398 			      kvm_s390_available_subfunc.kmf);
399 		__cpacf_query(CPACF_KMO, (cpacf_mask_t *)
400 			      kvm_s390_available_subfunc.kmo);
401 		__cpacf_query(CPACF_PCC, (cpacf_mask_t *)
402 			      kvm_s390_available_subfunc.pcc);
403 	}
404 	if (test_facility(57)) /* MSA5 */
405 		__cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
406 			      kvm_s390_available_subfunc.ppno);
407 
408 	if (test_facility(146)) /* MSA8 */
409 		__cpacf_query(CPACF_KMA, (cpacf_mask_t *)
410 			      kvm_s390_available_subfunc.kma);
411 
412 	if (test_facility(155)) /* MSA9 */
413 		__cpacf_query(CPACF_KDSA, (cpacf_mask_t *)
414 			      kvm_s390_available_subfunc.kdsa);
415 
416 	if (test_facility(150)) /* SORTL */
417 		__insn32_query(INSN_SORTL, kvm_s390_available_subfunc.sortl);
418 
419 	if (test_facility(151)) /* DFLTCC */
420 		__insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc);
421 
422 	if (MACHINE_HAS_ESOP)
423 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
424 	/*
425 	 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
426 	 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
427 	 */
428 	if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
429 	    !test_facility(3) || !nested)
430 		return;
431 	allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
432 	if (sclp.has_64bscao)
433 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
434 	if (sclp.has_siif)
435 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
436 	if (sclp.has_gpere)
437 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
438 	if (sclp.has_gsls)
439 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
440 	if (sclp.has_ib)
441 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
442 	if (sclp.has_cei)
443 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
444 	if (sclp.has_ibs)
445 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
446 	if (sclp.has_kss)
447 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
448 	/*
449 	 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
450 	 * all skey handling functions read/set the skey from the PGSTE
451 	 * instead of the real storage key.
452 	 *
453 	 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
454 	 * pages being detected as preserved although they are resident.
455 	 *
456 	 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
457 	 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
458 	 *
459 	 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
460 	 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
461 	 * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
462 	 *
463 	 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
464 	 * cannot easily shadow the SCA because of the ipte lock.
465 	 */
466 }
467 
468 static int __init __kvm_s390_init(void)
469 {
470 	int rc = -ENOMEM;
471 
472 	kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
473 	if (!kvm_s390_dbf)
474 		return -ENOMEM;
475 
476 	kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long));
477 	if (!kvm_s390_dbf_uv)
478 		goto err_kvm_uv;
479 
480 	if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) ||
481 	    debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view))
482 		goto err_debug_view;
483 
484 	kvm_s390_cpu_feat_init();
485 
486 	/* Register floating interrupt controller interface. */
487 	rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
488 	if (rc) {
489 		pr_err("A FLIC registration call failed with rc=%d\n", rc);
490 		goto err_flic;
491 	}
492 
493 	if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
494 		rc = kvm_s390_pci_init();
495 		if (rc) {
496 			pr_err("Unable to allocate AIFT for PCI\n");
497 			goto err_pci;
498 		}
499 	}
500 
501 	rc = kvm_s390_gib_init(GAL_ISC);
502 	if (rc)
503 		goto err_gib;
504 
505 	gmap_notifier.notifier_call = kvm_gmap_notifier;
506 	gmap_register_pte_notifier(&gmap_notifier);
507 	vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
508 	gmap_register_pte_notifier(&vsie_gmap_notifier);
509 	atomic_notifier_chain_register(&s390_epoch_delta_notifier,
510 				       &kvm_clock_notifier);
511 
512 	return 0;
513 
514 err_gib:
515 	if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
516 		kvm_s390_pci_exit();
517 err_pci:
518 err_flic:
519 err_debug_view:
520 	debug_unregister(kvm_s390_dbf_uv);
521 err_kvm_uv:
522 	debug_unregister(kvm_s390_dbf);
523 	return rc;
524 }
525 
526 static void __kvm_s390_exit(void)
527 {
528 	gmap_unregister_pte_notifier(&gmap_notifier);
529 	gmap_unregister_pte_notifier(&vsie_gmap_notifier);
530 	atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
531 					 &kvm_clock_notifier);
532 
533 	kvm_s390_gib_destroy();
534 	if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
535 		kvm_s390_pci_exit();
536 	debug_unregister(kvm_s390_dbf);
537 	debug_unregister(kvm_s390_dbf_uv);
538 }
539 
540 /* Section: device related */
541 long kvm_arch_dev_ioctl(struct file *filp,
542 			unsigned int ioctl, unsigned long arg)
543 {
544 	if (ioctl == KVM_S390_ENABLE_SIE)
545 		return s390_enable_sie();
546 	return -EINVAL;
547 }
548 
549 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
550 {
551 	int r;
552 
553 	switch (ext) {
554 	case KVM_CAP_S390_PSW:
555 	case KVM_CAP_S390_GMAP:
556 	case KVM_CAP_SYNC_MMU:
557 #ifdef CONFIG_KVM_S390_UCONTROL
558 	case KVM_CAP_S390_UCONTROL:
559 #endif
560 	case KVM_CAP_ASYNC_PF:
561 	case KVM_CAP_SYNC_REGS:
562 	case KVM_CAP_ONE_REG:
563 	case KVM_CAP_ENABLE_CAP:
564 	case KVM_CAP_S390_CSS_SUPPORT:
565 	case KVM_CAP_IOEVENTFD:
566 	case KVM_CAP_DEVICE_CTRL:
567 	case KVM_CAP_S390_IRQCHIP:
568 	case KVM_CAP_VM_ATTRIBUTES:
569 	case KVM_CAP_MP_STATE:
570 	case KVM_CAP_IMMEDIATE_EXIT:
571 	case KVM_CAP_S390_INJECT_IRQ:
572 	case KVM_CAP_S390_USER_SIGP:
573 	case KVM_CAP_S390_USER_STSI:
574 	case KVM_CAP_S390_SKEYS:
575 	case KVM_CAP_S390_IRQ_STATE:
576 	case KVM_CAP_S390_USER_INSTR0:
577 	case KVM_CAP_S390_CMMA_MIGRATION:
578 	case KVM_CAP_S390_AIS:
579 	case KVM_CAP_S390_AIS_MIGRATION:
580 	case KVM_CAP_S390_VCPU_RESETS:
581 	case KVM_CAP_SET_GUEST_DEBUG:
582 	case KVM_CAP_S390_DIAG318:
583 	case KVM_CAP_IRQFD_RESAMPLE:
584 		r = 1;
585 		break;
586 	case KVM_CAP_SET_GUEST_DEBUG2:
587 		r = KVM_GUESTDBG_VALID_MASK;
588 		break;
589 	case KVM_CAP_S390_HPAGE_1M:
590 		r = 0;
591 		if (hpage && !kvm_is_ucontrol(kvm))
592 			r = 1;
593 		break;
594 	case KVM_CAP_S390_MEM_OP:
595 		r = MEM_OP_MAX_SIZE;
596 		break;
597 	case KVM_CAP_S390_MEM_OP_EXTENSION:
598 		/*
599 		 * Flag bits indicating which extensions are supported.
600 		 * If r > 0, the base extension must also be supported/indicated,
601 		 * in order to maintain backwards compatibility.
602 		 */
603 		r = KVM_S390_MEMOP_EXTENSION_CAP_BASE |
604 		    KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG;
605 		break;
606 	case KVM_CAP_NR_VCPUS:
607 	case KVM_CAP_MAX_VCPUS:
608 	case KVM_CAP_MAX_VCPU_ID:
609 		r = KVM_S390_BSCA_CPU_SLOTS;
610 		if (!kvm_s390_use_sca_entries())
611 			r = KVM_MAX_VCPUS;
612 		else if (sclp.has_esca && sclp.has_64bscao)
613 			r = KVM_S390_ESCA_CPU_SLOTS;
614 		if (ext == KVM_CAP_NR_VCPUS)
615 			r = min_t(unsigned int, num_online_cpus(), r);
616 		break;
617 	case KVM_CAP_S390_COW:
618 		r = MACHINE_HAS_ESOP;
619 		break;
620 	case KVM_CAP_S390_VECTOR_REGISTERS:
621 		r = MACHINE_HAS_VX;
622 		break;
623 	case KVM_CAP_S390_RI:
624 		r = test_facility(64);
625 		break;
626 	case KVM_CAP_S390_GS:
627 		r = test_facility(133);
628 		break;
629 	case KVM_CAP_S390_BPB:
630 		r = test_facility(82);
631 		break;
632 	case KVM_CAP_S390_PROTECTED_ASYNC_DISABLE:
633 		r = async_destroy && is_prot_virt_host();
634 		break;
635 	case KVM_CAP_S390_PROTECTED:
636 		r = is_prot_virt_host();
637 		break;
638 	case KVM_CAP_S390_PROTECTED_DUMP: {
639 		u64 pv_cmds_dump[] = {
640 			BIT_UVC_CMD_DUMP_INIT,
641 			BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE,
642 			BIT_UVC_CMD_DUMP_CPU,
643 			BIT_UVC_CMD_DUMP_COMPLETE,
644 		};
645 		int i;
646 
647 		r = is_prot_virt_host();
648 
649 		for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) {
650 			if (!test_bit_inv(pv_cmds_dump[i],
651 					  (unsigned long *)&uv_info.inst_calls_list)) {
652 				r = 0;
653 				break;
654 			}
655 		}
656 		break;
657 	}
658 	case KVM_CAP_S390_ZPCI_OP:
659 		r = kvm_s390_pci_interp_allowed();
660 		break;
661 	case KVM_CAP_S390_CPU_TOPOLOGY:
662 		r = test_facility(11);
663 		break;
664 	default:
665 		r = 0;
666 	}
667 	return r;
668 }
669 
670 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
671 {
672 	int i;
673 	gfn_t cur_gfn, last_gfn;
674 	unsigned long gaddr, vmaddr;
675 	struct gmap *gmap = kvm->arch.gmap;
676 	DECLARE_BITMAP(bitmap, _PAGE_ENTRIES);
677 
678 	/* Loop over all guest segments */
679 	cur_gfn = memslot->base_gfn;
680 	last_gfn = memslot->base_gfn + memslot->npages;
681 	for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) {
682 		gaddr = gfn_to_gpa(cur_gfn);
683 		vmaddr = gfn_to_hva_memslot(memslot, cur_gfn);
684 		if (kvm_is_error_hva(vmaddr))
685 			continue;
686 
687 		bitmap_zero(bitmap, _PAGE_ENTRIES);
688 		gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr);
689 		for (i = 0; i < _PAGE_ENTRIES; i++) {
690 			if (test_bit(i, bitmap))
691 				mark_page_dirty(kvm, cur_gfn + i);
692 		}
693 
694 		if (fatal_signal_pending(current))
695 			return;
696 		cond_resched();
697 	}
698 }
699 
700 /* Section: vm related */
701 static void sca_del_vcpu(struct kvm_vcpu *vcpu);
702 
703 /*
704  * Get (and clear) the dirty memory log for a memory slot.
705  */
706 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
707 			       struct kvm_dirty_log *log)
708 {
709 	int r;
710 	unsigned long n;
711 	struct kvm_memory_slot *memslot;
712 	int is_dirty;
713 
714 	if (kvm_is_ucontrol(kvm))
715 		return -EINVAL;
716 
717 	mutex_lock(&kvm->slots_lock);
718 
719 	r = -EINVAL;
720 	if (log->slot >= KVM_USER_MEM_SLOTS)
721 		goto out;
722 
723 	r = kvm_get_dirty_log(kvm, log, &is_dirty, &memslot);
724 	if (r)
725 		goto out;
726 
727 	/* Clear the dirty log */
728 	if (is_dirty) {
729 		n = kvm_dirty_bitmap_bytes(memslot);
730 		memset(memslot->dirty_bitmap, 0, n);
731 	}
732 	r = 0;
733 out:
734 	mutex_unlock(&kvm->slots_lock);
735 	return r;
736 }
737 
738 static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
739 {
740 	unsigned long i;
741 	struct kvm_vcpu *vcpu;
742 
743 	kvm_for_each_vcpu(i, vcpu, kvm) {
744 		kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
745 	}
746 }
747 
748 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
749 {
750 	int r;
751 
752 	if (cap->flags)
753 		return -EINVAL;
754 
755 	switch (cap->cap) {
756 	case KVM_CAP_S390_IRQCHIP:
757 		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
758 		kvm->arch.use_irqchip = 1;
759 		r = 0;
760 		break;
761 	case KVM_CAP_S390_USER_SIGP:
762 		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
763 		kvm->arch.user_sigp = 1;
764 		r = 0;
765 		break;
766 	case KVM_CAP_S390_VECTOR_REGISTERS:
767 		mutex_lock(&kvm->lock);
768 		if (kvm->created_vcpus) {
769 			r = -EBUSY;
770 		} else if (MACHINE_HAS_VX) {
771 			set_kvm_facility(kvm->arch.model.fac_mask, 129);
772 			set_kvm_facility(kvm->arch.model.fac_list, 129);
773 			if (test_facility(134)) {
774 				set_kvm_facility(kvm->arch.model.fac_mask, 134);
775 				set_kvm_facility(kvm->arch.model.fac_list, 134);
776 			}
777 			if (test_facility(135)) {
778 				set_kvm_facility(kvm->arch.model.fac_mask, 135);
779 				set_kvm_facility(kvm->arch.model.fac_list, 135);
780 			}
781 			if (test_facility(148)) {
782 				set_kvm_facility(kvm->arch.model.fac_mask, 148);
783 				set_kvm_facility(kvm->arch.model.fac_list, 148);
784 			}
785 			if (test_facility(152)) {
786 				set_kvm_facility(kvm->arch.model.fac_mask, 152);
787 				set_kvm_facility(kvm->arch.model.fac_list, 152);
788 			}
789 			if (test_facility(192)) {
790 				set_kvm_facility(kvm->arch.model.fac_mask, 192);
791 				set_kvm_facility(kvm->arch.model.fac_list, 192);
792 			}
793 			r = 0;
794 		} else
795 			r = -EINVAL;
796 		mutex_unlock(&kvm->lock);
797 		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
798 			 r ? "(not available)" : "(success)");
799 		break;
800 	case KVM_CAP_S390_RI:
801 		r = -EINVAL;
802 		mutex_lock(&kvm->lock);
803 		if (kvm->created_vcpus) {
804 			r = -EBUSY;
805 		} else if (test_facility(64)) {
806 			set_kvm_facility(kvm->arch.model.fac_mask, 64);
807 			set_kvm_facility(kvm->arch.model.fac_list, 64);
808 			r = 0;
809 		}
810 		mutex_unlock(&kvm->lock);
811 		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
812 			 r ? "(not available)" : "(success)");
813 		break;
814 	case KVM_CAP_S390_AIS:
815 		mutex_lock(&kvm->lock);
816 		if (kvm->created_vcpus) {
817 			r = -EBUSY;
818 		} else {
819 			set_kvm_facility(kvm->arch.model.fac_mask, 72);
820 			set_kvm_facility(kvm->arch.model.fac_list, 72);
821 			r = 0;
822 		}
823 		mutex_unlock(&kvm->lock);
824 		VM_EVENT(kvm, 3, "ENABLE: AIS %s",
825 			 r ? "(not available)" : "(success)");
826 		break;
827 	case KVM_CAP_S390_GS:
828 		r = -EINVAL;
829 		mutex_lock(&kvm->lock);
830 		if (kvm->created_vcpus) {
831 			r = -EBUSY;
832 		} else if (test_facility(133)) {
833 			set_kvm_facility(kvm->arch.model.fac_mask, 133);
834 			set_kvm_facility(kvm->arch.model.fac_list, 133);
835 			r = 0;
836 		}
837 		mutex_unlock(&kvm->lock);
838 		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
839 			 r ? "(not available)" : "(success)");
840 		break;
841 	case KVM_CAP_S390_HPAGE_1M:
842 		mutex_lock(&kvm->lock);
843 		if (kvm->created_vcpus)
844 			r = -EBUSY;
845 		else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm))
846 			r = -EINVAL;
847 		else {
848 			r = 0;
849 			mmap_write_lock(kvm->mm);
850 			kvm->mm->context.allow_gmap_hpage_1m = 1;
851 			mmap_write_unlock(kvm->mm);
852 			/*
853 			 * We might have to create fake 4k page
854 			 * tables. To avoid that the hardware works on
855 			 * stale PGSTEs, we emulate these instructions.
856 			 */
857 			kvm->arch.use_skf = 0;
858 			kvm->arch.use_pfmfi = 0;
859 		}
860 		mutex_unlock(&kvm->lock);
861 		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s",
862 			 r ? "(not available)" : "(success)");
863 		break;
864 	case KVM_CAP_S390_USER_STSI:
865 		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
866 		kvm->arch.user_stsi = 1;
867 		r = 0;
868 		break;
869 	case KVM_CAP_S390_USER_INSTR0:
870 		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
871 		kvm->arch.user_instr0 = 1;
872 		icpt_operexc_on_all_vcpus(kvm);
873 		r = 0;
874 		break;
875 	case KVM_CAP_S390_CPU_TOPOLOGY:
876 		r = -EINVAL;
877 		mutex_lock(&kvm->lock);
878 		if (kvm->created_vcpus) {
879 			r = -EBUSY;
880 		} else if (test_facility(11)) {
881 			set_kvm_facility(kvm->arch.model.fac_mask, 11);
882 			set_kvm_facility(kvm->arch.model.fac_list, 11);
883 			r = 0;
884 		}
885 		mutex_unlock(&kvm->lock);
886 		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_CPU_TOPOLOGY %s",
887 			 r ? "(not available)" : "(success)");
888 		break;
889 	default:
890 		r = -EINVAL;
891 		break;
892 	}
893 	return r;
894 }
895 
896 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
897 {
898 	int ret;
899 
900 	switch (attr->attr) {
901 	case KVM_S390_VM_MEM_LIMIT_SIZE:
902 		ret = 0;
903 		VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
904 			 kvm->arch.mem_limit);
905 		if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
906 			ret = -EFAULT;
907 		break;
908 	default:
909 		ret = -ENXIO;
910 		break;
911 	}
912 	return ret;
913 }
914 
915 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
916 {
917 	int ret;
918 	unsigned int idx;
919 	switch (attr->attr) {
920 	case KVM_S390_VM_MEM_ENABLE_CMMA:
921 		ret = -ENXIO;
922 		if (!sclp.has_cmma)
923 			break;
924 
925 		VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
926 		mutex_lock(&kvm->lock);
927 		if (kvm->created_vcpus)
928 			ret = -EBUSY;
929 		else if (kvm->mm->context.allow_gmap_hpage_1m)
930 			ret = -EINVAL;
931 		else {
932 			kvm->arch.use_cmma = 1;
933 			/* Not compatible with cmma. */
934 			kvm->arch.use_pfmfi = 0;
935 			ret = 0;
936 		}
937 		mutex_unlock(&kvm->lock);
938 		break;
939 	case KVM_S390_VM_MEM_CLR_CMMA:
940 		ret = -ENXIO;
941 		if (!sclp.has_cmma)
942 			break;
943 		ret = -EINVAL;
944 		if (!kvm->arch.use_cmma)
945 			break;
946 
947 		VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
948 		mutex_lock(&kvm->lock);
949 		idx = srcu_read_lock(&kvm->srcu);
950 		s390_reset_cmma(kvm->arch.gmap->mm);
951 		srcu_read_unlock(&kvm->srcu, idx);
952 		mutex_unlock(&kvm->lock);
953 		ret = 0;
954 		break;
955 	case KVM_S390_VM_MEM_LIMIT_SIZE: {
956 		unsigned long new_limit;
957 
958 		if (kvm_is_ucontrol(kvm))
959 			return -EINVAL;
960 
961 		if (get_user(new_limit, (u64 __user *)attr->addr))
962 			return -EFAULT;
963 
964 		if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
965 		    new_limit > kvm->arch.mem_limit)
966 			return -E2BIG;
967 
968 		if (!new_limit)
969 			return -EINVAL;
970 
971 		/* gmap_create takes last usable address */
972 		if (new_limit != KVM_S390_NO_MEM_LIMIT)
973 			new_limit -= 1;
974 
975 		ret = -EBUSY;
976 		mutex_lock(&kvm->lock);
977 		if (!kvm->created_vcpus) {
978 			/* gmap_create will round the limit up */
979 			struct gmap *new = gmap_create(current->mm, new_limit);
980 
981 			if (!new) {
982 				ret = -ENOMEM;
983 			} else {
984 				gmap_remove(kvm->arch.gmap);
985 				new->private = kvm;
986 				kvm->arch.gmap = new;
987 				ret = 0;
988 			}
989 		}
990 		mutex_unlock(&kvm->lock);
991 		VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
992 		VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
993 			 (void *) kvm->arch.gmap->asce);
994 		break;
995 	}
996 	default:
997 		ret = -ENXIO;
998 		break;
999 	}
1000 	return ret;
1001 }
1002 
1003 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
1004 
1005 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
1006 {
1007 	struct kvm_vcpu *vcpu;
1008 	unsigned long i;
1009 
1010 	kvm_s390_vcpu_block_all(kvm);
1011 
1012 	kvm_for_each_vcpu(i, vcpu, kvm) {
1013 		kvm_s390_vcpu_crypto_setup(vcpu);
1014 		/* recreate the shadow crycb by leaving the VSIE handler */
1015 		kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
1016 	}
1017 
1018 	kvm_s390_vcpu_unblock_all(kvm);
1019 }
1020 
1021 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
1022 {
1023 	mutex_lock(&kvm->lock);
1024 	switch (attr->attr) {
1025 	case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
1026 		if (!test_kvm_facility(kvm, 76)) {
1027 			mutex_unlock(&kvm->lock);
1028 			return -EINVAL;
1029 		}
1030 		get_random_bytes(
1031 			kvm->arch.crypto.crycb->aes_wrapping_key_mask,
1032 			sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
1033 		kvm->arch.crypto.aes_kw = 1;
1034 		VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
1035 		break;
1036 	case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
1037 		if (!test_kvm_facility(kvm, 76)) {
1038 			mutex_unlock(&kvm->lock);
1039 			return -EINVAL;
1040 		}
1041 		get_random_bytes(
1042 			kvm->arch.crypto.crycb->dea_wrapping_key_mask,
1043 			sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1044 		kvm->arch.crypto.dea_kw = 1;
1045 		VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
1046 		break;
1047 	case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
1048 		if (!test_kvm_facility(kvm, 76)) {
1049 			mutex_unlock(&kvm->lock);
1050 			return -EINVAL;
1051 		}
1052 		kvm->arch.crypto.aes_kw = 0;
1053 		memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
1054 			sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
1055 		VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
1056 		break;
1057 	case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
1058 		if (!test_kvm_facility(kvm, 76)) {
1059 			mutex_unlock(&kvm->lock);
1060 			return -EINVAL;
1061 		}
1062 		kvm->arch.crypto.dea_kw = 0;
1063 		memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
1064 			sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1065 		VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
1066 		break;
1067 	case KVM_S390_VM_CRYPTO_ENABLE_APIE:
1068 		if (!ap_instructions_available()) {
1069 			mutex_unlock(&kvm->lock);
1070 			return -EOPNOTSUPP;
1071 		}
1072 		kvm->arch.crypto.apie = 1;
1073 		break;
1074 	case KVM_S390_VM_CRYPTO_DISABLE_APIE:
1075 		if (!ap_instructions_available()) {
1076 			mutex_unlock(&kvm->lock);
1077 			return -EOPNOTSUPP;
1078 		}
1079 		kvm->arch.crypto.apie = 0;
1080 		break;
1081 	default:
1082 		mutex_unlock(&kvm->lock);
1083 		return -ENXIO;
1084 	}
1085 
1086 	kvm_s390_vcpu_crypto_reset_all(kvm);
1087 	mutex_unlock(&kvm->lock);
1088 	return 0;
1089 }
1090 
1091 static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu)
1092 {
1093 	/* Only set the ECB bits after guest requests zPCI interpretation */
1094 	if (!vcpu->kvm->arch.use_zpci_interp)
1095 		return;
1096 
1097 	vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI;
1098 	vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI;
1099 }
1100 
1101 void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm)
1102 {
1103 	struct kvm_vcpu *vcpu;
1104 	unsigned long i;
1105 
1106 	lockdep_assert_held(&kvm->lock);
1107 
1108 	if (!kvm_s390_pci_interp_allowed())
1109 		return;
1110 
1111 	/*
1112 	 * If host is configured for PCI and the necessary facilities are
1113 	 * available, turn on interpretation for the life of this guest
1114 	 */
1115 	kvm->arch.use_zpci_interp = 1;
1116 
1117 	kvm_s390_vcpu_block_all(kvm);
1118 
1119 	kvm_for_each_vcpu(i, vcpu, kvm) {
1120 		kvm_s390_vcpu_pci_setup(vcpu);
1121 		kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
1122 	}
1123 
1124 	kvm_s390_vcpu_unblock_all(kvm);
1125 }
1126 
1127 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
1128 {
1129 	unsigned long cx;
1130 	struct kvm_vcpu *vcpu;
1131 
1132 	kvm_for_each_vcpu(cx, vcpu, kvm)
1133 		kvm_s390_sync_request(req, vcpu);
1134 }
1135 
1136 /*
1137  * Must be called with kvm->srcu held to avoid races on memslots, and with
1138  * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
1139  */
1140 static int kvm_s390_vm_start_migration(struct kvm *kvm)
1141 {
1142 	struct kvm_memory_slot *ms;
1143 	struct kvm_memslots *slots;
1144 	unsigned long ram_pages = 0;
1145 	int bkt;
1146 
1147 	/* migration mode already enabled */
1148 	if (kvm->arch.migration_mode)
1149 		return 0;
1150 	slots = kvm_memslots(kvm);
1151 	if (!slots || kvm_memslots_empty(slots))
1152 		return -EINVAL;
1153 
1154 	if (!kvm->arch.use_cmma) {
1155 		kvm->arch.migration_mode = 1;
1156 		return 0;
1157 	}
1158 	/* mark all the pages in active slots as dirty */
1159 	kvm_for_each_memslot(ms, bkt, slots) {
1160 		if (!ms->dirty_bitmap)
1161 			return -EINVAL;
1162 		/*
1163 		 * The second half of the bitmap is only used on x86,
1164 		 * and would be wasted otherwise, so we put it to good
1165 		 * use here to keep track of the state of the storage
1166 		 * attributes.
1167 		 */
1168 		memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms));
1169 		ram_pages += ms->npages;
1170 	}
1171 	atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages);
1172 	kvm->arch.migration_mode = 1;
1173 	kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
1174 	return 0;
1175 }
1176 
1177 /*
1178  * Must be called with kvm->slots_lock to avoid races with ourselves and
1179  * kvm_s390_vm_start_migration.
1180  */
1181 static int kvm_s390_vm_stop_migration(struct kvm *kvm)
1182 {
1183 	/* migration mode already disabled */
1184 	if (!kvm->arch.migration_mode)
1185 		return 0;
1186 	kvm->arch.migration_mode = 0;
1187 	if (kvm->arch.use_cmma)
1188 		kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
1189 	return 0;
1190 }
1191 
1192 static int kvm_s390_vm_set_migration(struct kvm *kvm,
1193 				     struct kvm_device_attr *attr)
1194 {
1195 	int res = -ENXIO;
1196 
1197 	mutex_lock(&kvm->slots_lock);
1198 	switch (attr->attr) {
1199 	case KVM_S390_VM_MIGRATION_START:
1200 		res = kvm_s390_vm_start_migration(kvm);
1201 		break;
1202 	case KVM_S390_VM_MIGRATION_STOP:
1203 		res = kvm_s390_vm_stop_migration(kvm);
1204 		break;
1205 	default:
1206 		break;
1207 	}
1208 	mutex_unlock(&kvm->slots_lock);
1209 
1210 	return res;
1211 }
1212 
1213 static int kvm_s390_vm_get_migration(struct kvm *kvm,
1214 				     struct kvm_device_attr *attr)
1215 {
1216 	u64 mig = kvm->arch.migration_mode;
1217 
1218 	if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
1219 		return -ENXIO;
1220 
1221 	if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
1222 		return -EFAULT;
1223 	return 0;
1224 }
1225 
1226 static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod);
1227 
1228 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1229 {
1230 	struct kvm_s390_vm_tod_clock gtod;
1231 
1232 	if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
1233 		return -EFAULT;
1234 
1235 	if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx)
1236 		return -EINVAL;
1237 	__kvm_s390_set_tod_clock(kvm, &gtod);
1238 
1239 	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
1240 		gtod.epoch_idx, gtod.tod);
1241 
1242 	return 0;
1243 }
1244 
1245 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1246 {
1247 	u8 gtod_high;
1248 
1249 	if (copy_from_user(&gtod_high, (void __user *)attr->addr,
1250 					   sizeof(gtod_high)))
1251 		return -EFAULT;
1252 
1253 	if (gtod_high != 0)
1254 		return -EINVAL;
1255 	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
1256 
1257 	return 0;
1258 }
1259 
1260 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1261 {
1262 	struct kvm_s390_vm_tod_clock gtod = { 0 };
1263 
1264 	if (copy_from_user(&gtod.tod, (void __user *)attr->addr,
1265 			   sizeof(gtod.tod)))
1266 		return -EFAULT;
1267 
1268 	__kvm_s390_set_tod_clock(kvm, &gtod);
1269 	VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod);
1270 	return 0;
1271 }
1272 
1273 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1274 {
1275 	int ret;
1276 
1277 	if (attr->flags)
1278 		return -EINVAL;
1279 
1280 	mutex_lock(&kvm->lock);
1281 	/*
1282 	 * For protected guests, the TOD is managed by the ultravisor, so trying
1283 	 * to change it will never bring the expected results.
1284 	 */
1285 	if (kvm_s390_pv_is_protected(kvm)) {
1286 		ret = -EOPNOTSUPP;
1287 		goto out_unlock;
1288 	}
1289 
1290 	switch (attr->attr) {
1291 	case KVM_S390_VM_TOD_EXT:
1292 		ret = kvm_s390_set_tod_ext(kvm, attr);
1293 		break;
1294 	case KVM_S390_VM_TOD_HIGH:
1295 		ret = kvm_s390_set_tod_high(kvm, attr);
1296 		break;
1297 	case KVM_S390_VM_TOD_LOW:
1298 		ret = kvm_s390_set_tod_low(kvm, attr);
1299 		break;
1300 	default:
1301 		ret = -ENXIO;
1302 		break;
1303 	}
1304 
1305 out_unlock:
1306 	mutex_unlock(&kvm->lock);
1307 	return ret;
1308 }
1309 
1310 static void kvm_s390_get_tod_clock(struct kvm *kvm,
1311 				   struct kvm_s390_vm_tod_clock *gtod)
1312 {
1313 	union tod_clock clk;
1314 
1315 	preempt_disable();
1316 
1317 	store_tod_clock_ext(&clk);
1318 
1319 	gtod->tod = clk.tod + kvm->arch.epoch;
1320 	gtod->epoch_idx = 0;
1321 	if (test_kvm_facility(kvm, 139)) {
1322 		gtod->epoch_idx = clk.ei + kvm->arch.epdx;
1323 		if (gtod->tod < clk.tod)
1324 			gtod->epoch_idx += 1;
1325 	}
1326 
1327 	preempt_enable();
1328 }
1329 
1330 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1331 {
1332 	struct kvm_s390_vm_tod_clock gtod;
1333 
1334 	memset(&gtod, 0, sizeof(gtod));
1335 	kvm_s390_get_tod_clock(kvm, &gtod);
1336 	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1337 		return -EFAULT;
1338 
1339 	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
1340 		gtod.epoch_idx, gtod.tod);
1341 	return 0;
1342 }
1343 
1344 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1345 {
1346 	u8 gtod_high = 0;
1347 
1348 	if (copy_to_user((void __user *)attr->addr, &gtod_high,
1349 					 sizeof(gtod_high)))
1350 		return -EFAULT;
1351 	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
1352 
1353 	return 0;
1354 }
1355 
1356 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1357 {
1358 	u64 gtod;
1359 
1360 	gtod = kvm_s390_get_tod_clock_fast(kvm);
1361 	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1362 		return -EFAULT;
1363 	VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1364 
1365 	return 0;
1366 }
1367 
1368 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1369 {
1370 	int ret;
1371 
1372 	if (attr->flags)
1373 		return -EINVAL;
1374 
1375 	switch (attr->attr) {
1376 	case KVM_S390_VM_TOD_EXT:
1377 		ret = kvm_s390_get_tod_ext(kvm, attr);
1378 		break;
1379 	case KVM_S390_VM_TOD_HIGH:
1380 		ret = kvm_s390_get_tod_high(kvm, attr);
1381 		break;
1382 	case KVM_S390_VM_TOD_LOW:
1383 		ret = kvm_s390_get_tod_low(kvm, attr);
1384 		break;
1385 	default:
1386 		ret = -ENXIO;
1387 		break;
1388 	}
1389 	return ret;
1390 }
1391 
1392 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1393 {
1394 	struct kvm_s390_vm_cpu_processor *proc;
1395 	u16 lowest_ibc, unblocked_ibc;
1396 	int ret = 0;
1397 
1398 	mutex_lock(&kvm->lock);
1399 	if (kvm->created_vcpus) {
1400 		ret = -EBUSY;
1401 		goto out;
1402 	}
1403 	proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT);
1404 	if (!proc) {
1405 		ret = -ENOMEM;
1406 		goto out;
1407 	}
1408 	if (!copy_from_user(proc, (void __user *)attr->addr,
1409 			    sizeof(*proc))) {
1410 		kvm->arch.model.cpuid = proc->cpuid;
1411 		lowest_ibc = sclp.ibc >> 16 & 0xfff;
1412 		unblocked_ibc = sclp.ibc & 0xfff;
1413 		if (lowest_ibc && proc->ibc) {
1414 			if (proc->ibc > unblocked_ibc)
1415 				kvm->arch.model.ibc = unblocked_ibc;
1416 			else if (proc->ibc < lowest_ibc)
1417 				kvm->arch.model.ibc = lowest_ibc;
1418 			else
1419 				kvm->arch.model.ibc = proc->ibc;
1420 		}
1421 		memcpy(kvm->arch.model.fac_list, proc->fac_list,
1422 		       S390_ARCH_FAC_LIST_SIZE_BYTE);
1423 		VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1424 			 kvm->arch.model.ibc,
1425 			 kvm->arch.model.cpuid);
1426 		VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1427 			 kvm->arch.model.fac_list[0],
1428 			 kvm->arch.model.fac_list[1],
1429 			 kvm->arch.model.fac_list[2]);
1430 	} else
1431 		ret = -EFAULT;
1432 	kfree(proc);
1433 out:
1434 	mutex_unlock(&kvm->lock);
1435 	return ret;
1436 }
1437 
1438 static int kvm_s390_set_processor_feat(struct kvm *kvm,
1439 				       struct kvm_device_attr *attr)
1440 {
1441 	struct kvm_s390_vm_cpu_feat data;
1442 
1443 	if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
1444 		return -EFAULT;
1445 	if (!bitmap_subset((unsigned long *) data.feat,
1446 			   kvm_s390_available_cpu_feat,
1447 			   KVM_S390_VM_CPU_FEAT_NR_BITS))
1448 		return -EINVAL;
1449 
1450 	mutex_lock(&kvm->lock);
1451 	if (kvm->created_vcpus) {
1452 		mutex_unlock(&kvm->lock);
1453 		return -EBUSY;
1454 	}
1455 	bitmap_from_arr64(kvm->arch.cpu_feat, data.feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
1456 	mutex_unlock(&kvm->lock);
1457 	VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1458 			 data.feat[0],
1459 			 data.feat[1],
1460 			 data.feat[2]);
1461 	return 0;
1462 }
1463 
1464 static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
1465 					  struct kvm_device_attr *attr)
1466 {
1467 	mutex_lock(&kvm->lock);
1468 	if (kvm->created_vcpus) {
1469 		mutex_unlock(&kvm->lock);
1470 		return -EBUSY;
1471 	}
1472 
1473 	if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
1474 			   sizeof(struct kvm_s390_vm_cpu_subfunc))) {
1475 		mutex_unlock(&kvm->lock);
1476 		return -EFAULT;
1477 	}
1478 	mutex_unlock(&kvm->lock);
1479 
1480 	VM_EVENT(kvm, 3, "SET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1481 		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1482 		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1483 		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1484 		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1485 	VM_EVENT(kvm, 3, "SET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
1486 		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1487 		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1488 	VM_EVENT(kvm, 3, "SET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
1489 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1490 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1491 	VM_EVENT(kvm, 3, "SET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
1492 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1493 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1494 	VM_EVENT(kvm, 3, "SET: guest KM     subfunc 0x%16.16lx.%16.16lx",
1495 		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1496 		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1497 	VM_EVENT(kvm, 3, "SET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
1498 		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1499 		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1500 	VM_EVENT(kvm, 3, "SET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
1501 		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1502 		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1503 	VM_EVENT(kvm, 3, "SET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
1504 		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1505 		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1506 	VM_EVENT(kvm, 3, "SET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
1507 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1508 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1509 	VM_EVENT(kvm, 3, "SET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
1510 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1511 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1512 	VM_EVENT(kvm, 3, "SET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
1513 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1514 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1515 	VM_EVENT(kvm, 3, "SET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
1516 		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1517 		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1518 	VM_EVENT(kvm, 3, "SET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
1519 		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1520 		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1521 	VM_EVENT(kvm, 3, "SET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
1522 		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1523 		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1524 	VM_EVENT(kvm, 3, "SET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
1525 		 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1526 		 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1527 	VM_EVENT(kvm, 3, "SET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1528 		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1529 		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1530 		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1531 		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1532 	VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1533 		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1534 		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1535 		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1536 		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1537 
1538 	return 0;
1539 }
1540 
1541 #define KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK	\
1542 (						\
1543 	((struct kvm_s390_vm_cpu_uv_feat){	\
1544 		.ap = 1,			\
1545 		.ap_intr = 1,			\
1546 	})					\
1547 	.feat					\
1548 )
1549 
1550 static int kvm_s390_set_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr)
1551 {
1552 	struct kvm_s390_vm_cpu_uv_feat __user *ptr = (void __user *)attr->addr;
1553 	unsigned long data, filter;
1554 
1555 	filter = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK;
1556 	if (get_user(data, &ptr->feat))
1557 		return -EFAULT;
1558 	if (!bitmap_subset(&data, &filter, KVM_S390_VM_CPU_UV_FEAT_NR_BITS))
1559 		return -EINVAL;
1560 
1561 	mutex_lock(&kvm->lock);
1562 	if (kvm->created_vcpus) {
1563 		mutex_unlock(&kvm->lock);
1564 		return -EBUSY;
1565 	}
1566 	kvm->arch.model.uv_feat_guest.feat = data;
1567 	mutex_unlock(&kvm->lock);
1568 
1569 	VM_EVENT(kvm, 3, "SET: guest UV-feat: 0x%16.16lx", data);
1570 
1571 	return 0;
1572 }
1573 
1574 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1575 {
1576 	int ret = -ENXIO;
1577 
1578 	switch (attr->attr) {
1579 	case KVM_S390_VM_CPU_PROCESSOR:
1580 		ret = kvm_s390_set_processor(kvm, attr);
1581 		break;
1582 	case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1583 		ret = kvm_s390_set_processor_feat(kvm, attr);
1584 		break;
1585 	case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1586 		ret = kvm_s390_set_processor_subfunc(kvm, attr);
1587 		break;
1588 	case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST:
1589 		ret = kvm_s390_set_uv_feat(kvm, attr);
1590 		break;
1591 	}
1592 	return ret;
1593 }
1594 
1595 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1596 {
1597 	struct kvm_s390_vm_cpu_processor *proc;
1598 	int ret = 0;
1599 
1600 	proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT);
1601 	if (!proc) {
1602 		ret = -ENOMEM;
1603 		goto out;
1604 	}
1605 	proc->cpuid = kvm->arch.model.cpuid;
1606 	proc->ibc = kvm->arch.model.ibc;
1607 	memcpy(&proc->fac_list, kvm->arch.model.fac_list,
1608 	       S390_ARCH_FAC_LIST_SIZE_BYTE);
1609 	VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1610 		 kvm->arch.model.ibc,
1611 		 kvm->arch.model.cpuid);
1612 	VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1613 		 kvm->arch.model.fac_list[0],
1614 		 kvm->arch.model.fac_list[1],
1615 		 kvm->arch.model.fac_list[2]);
1616 	if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
1617 		ret = -EFAULT;
1618 	kfree(proc);
1619 out:
1620 	return ret;
1621 }
1622 
1623 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
1624 {
1625 	struct kvm_s390_vm_cpu_machine *mach;
1626 	int ret = 0;
1627 
1628 	mach = kzalloc(sizeof(*mach), GFP_KERNEL_ACCOUNT);
1629 	if (!mach) {
1630 		ret = -ENOMEM;
1631 		goto out;
1632 	}
1633 	get_cpu_id((struct cpuid *) &mach->cpuid);
1634 	mach->ibc = sclp.ibc;
1635 	memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1636 	       S390_ARCH_FAC_LIST_SIZE_BYTE);
1637 	memcpy((unsigned long *)&mach->fac_list, stfle_fac_list,
1638 	       sizeof(stfle_fac_list));
1639 	VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
1640 		 kvm->arch.model.ibc,
1641 		 kvm->arch.model.cpuid);
1642 	VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
1643 		 mach->fac_mask[0],
1644 		 mach->fac_mask[1],
1645 		 mach->fac_mask[2]);
1646 	VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
1647 		 mach->fac_list[0],
1648 		 mach->fac_list[1],
1649 		 mach->fac_list[2]);
1650 	if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
1651 		ret = -EFAULT;
1652 	kfree(mach);
1653 out:
1654 	return ret;
1655 }
1656 
1657 static int kvm_s390_get_processor_feat(struct kvm *kvm,
1658 				       struct kvm_device_attr *attr)
1659 {
1660 	struct kvm_s390_vm_cpu_feat data;
1661 
1662 	bitmap_to_arr64(data.feat, kvm->arch.cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
1663 	if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1664 		return -EFAULT;
1665 	VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1666 			 data.feat[0],
1667 			 data.feat[1],
1668 			 data.feat[2]);
1669 	return 0;
1670 }
1671 
1672 static int kvm_s390_get_machine_feat(struct kvm *kvm,
1673 				     struct kvm_device_attr *attr)
1674 {
1675 	struct kvm_s390_vm_cpu_feat data;
1676 
1677 	bitmap_to_arr64(data.feat, kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
1678 	if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1679 		return -EFAULT;
1680 	VM_EVENT(kvm, 3, "GET: host feat:  0x%16.16llx.0x%16.16llx.0x%16.16llx",
1681 			 data.feat[0],
1682 			 data.feat[1],
1683 			 data.feat[2]);
1684 	return 0;
1685 }
1686 
1687 static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
1688 					  struct kvm_device_attr *attr)
1689 {
1690 	if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
1691 	    sizeof(struct kvm_s390_vm_cpu_subfunc)))
1692 		return -EFAULT;
1693 
1694 	VM_EVENT(kvm, 3, "GET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1695 		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1696 		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1697 		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1698 		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1699 	VM_EVENT(kvm, 3, "GET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
1700 		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1701 		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1702 	VM_EVENT(kvm, 3, "GET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
1703 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1704 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1705 	VM_EVENT(kvm, 3, "GET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
1706 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1707 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1708 	VM_EVENT(kvm, 3, "GET: guest KM     subfunc 0x%16.16lx.%16.16lx",
1709 		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1710 		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1711 	VM_EVENT(kvm, 3, "GET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
1712 		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1713 		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1714 	VM_EVENT(kvm, 3, "GET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
1715 		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1716 		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1717 	VM_EVENT(kvm, 3, "GET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
1718 		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1719 		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1720 	VM_EVENT(kvm, 3, "GET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
1721 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1722 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1723 	VM_EVENT(kvm, 3, "GET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
1724 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1725 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1726 	VM_EVENT(kvm, 3, "GET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
1727 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1728 		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1729 	VM_EVENT(kvm, 3, "GET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
1730 		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1731 		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1732 	VM_EVENT(kvm, 3, "GET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
1733 		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1734 		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1735 	VM_EVENT(kvm, 3, "GET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
1736 		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1737 		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1738 	VM_EVENT(kvm, 3, "GET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
1739 		 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1740 		 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1741 	VM_EVENT(kvm, 3, "GET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1742 		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1743 		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1744 		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1745 		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1746 	VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1747 		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1748 		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1749 		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1750 		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1751 
1752 	return 0;
1753 }
1754 
1755 static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
1756 					struct kvm_device_attr *attr)
1757 {
1758 	if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
1759 	    sizeof(struct kvm_s390_vm_cpu_subfunc)))
1760 		return -EFAULT;
1761 
1762 	VM_EVENT(kvm, 3, "GET: host  PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1763 		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0],
1764 		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1],
1765 		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2],
1766 		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]);
1767 	VM_EVENT(kvm, 3, "GET: host  PTFF   subfunc 0x%16.16lx.%16.16lx",
1768 		 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0],
1769 		 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]);
1770 	VM_EVENT(kvm, 3, "GET: host  KMAC   subfunc 0x%16.16lx.%16.16lx",
1771 		 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0],
1772 		 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]);
1773 	VM_EVENT(kvm, 3, "GET: host  KMC    subfunc 0x%16.16lx.%16.16lx",
1774 		 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0],
1775 		 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]);
1776 	VM_EVENT(kvm, 3, "GET: host  KM     subfunc 0x%16.16lx.%16.16lx",
1777 		 ((unsigned long *) &kvm_s390_available_subfunc.km)[0],
1778 		 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]);
1779 	VM_EVENT(kvm, 3, "GET: host  KIMD   subfunc 0x%16.16lx.%16.16lx",
1780 		 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0],
1781 		 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]);
1782 	VM_EVENT(kvm, 3, "GET: host  KLMD   subfunc 0x%16.16lx.%16.16lx",
1783 		 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0],
1784 		 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]);
1785 	VM_EVENT(kvm, 3, "GET: host  PCKMO  subfunc 0x%16.16lx.%16.16lx",
1786 		 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0],
1787 		 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]);
1788 	VM_EVENT(kvm, 3, "GET: host  KMCTR  subfunc 0x%16.16lx.%16.16lx",
1789 		 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0],
1790 		 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]);
1791 	VM_EVENT(kvm, 3, "GET: host  KMF    subfunc 0x%16.16lx.%16.16lx",
1792 		 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0],
1793 		 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]);
1794 	VM_EVENT(kvm, 3, "GET: host  KMO    subfunc 0x%16.16lx.%16.16lx",
1795 		 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0],
1796 		 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]);
1797 	VM_EVENT(kvm, 3, "GET: host  PCC    subfunc 0x%16.16lx.%16.16lx",
1798 		 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0],
1799 		 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]);
1800 	VM_EVENT(kvm, 3, "GET: host  PPNO   subfunc 0x%16.16lx.%16.16lx",
1801 		 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0],
1802 		 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]);
1803 	VM_EVENT(kvm, 3, "GET: host  KMA    subfunc 0x%16.16lx.%16.16lx",
1804 		 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0],
1805 		 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]);
1806 	VM_EVENT(kvm, 3, "GET: host  KDSA   subfunc 0x%16.16lx.%16.16lx",
1807 		 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0],
1808 		 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]);
1809 	VM_EVENT(kvm, 3, "GET: host  SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1810 		 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0],
1811 		 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1],
1812 		 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2],
1813 		 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]);
1814 	VM_EVENT(kvm, 3, "GET: host  DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1815 		 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0],
1816 		 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1],
1817 		 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2],
1818 		 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]);
1819 
1820 	return 0;
1821 }
1822 
1823 static int kvm_s390_get_processor_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr)
1824 {
1825 	struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr;
1826 	unsigned long feat = kvm->arch.model.uv_feat_guest.feat;
1827 
1828 	if (put_user(feat, &dst->feat))
1829 		return -EFAULT;
1830 	VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat);
1831 
1832 	return 0;
1833 }
1834 
1835 static int kvm_s390_get_machine_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr)
1836 {
1837 	struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr;
1838 	unsigned long feat;
1839 
1840 	BUILD_BUG_ON(sizeof(*dst) != sizeof(uv_info.uv_feature_indications));
1841 
1842 	feat = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK;
1843 	if (put_user(feat, &dst->feat))
1844 		return -EFAULT;
1845 	VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat);
1846 
1847 	return 0;
1848 }
1849 
1850 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1851 {
1852 	int ret = -ENXIO;
1853 
1854 	switch (attr->attr) {
1855 	case KVM_S390_VM_CPU_PROCESSOR:
1856 		ret = kvm_s390_get_processor(kvm, attr);
1857 		break;
1858 	case KVM_S390_VM_CPU_MACHINE:
1859 		ret = kvm_s390_get_machine(kvm, attr);
1860 		break;
1861 	case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1862 		ret = kvm_s390_get_processor_feat(kvm, attr);
1863 		break;
1864 	case KVM_S390_VM_CPU_MACHINE_FEAT:
1865 		ret = kvm_s390_get_machine_feat(kvm, attr);
1866 		break;
1867 	case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1868 		ret = kvm_s390_get_processor_subfunc(kvm, attr);
1869 		break;
1870 	case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1871 		ret = kvm_s390_get_machine_subfunc(kvm, attr);
1872 		break;
1873 	case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST:
1874 		ret = kvm_s390_get_processor_uv_feat(kvm, attr);
1875 		break;
1876 	case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST:
1877 		ret = kvm_s390_get_machine_uv_feat(kvm, attr);
1878 		break;
1879 	}
1880 	return ret;
1881 }
1882 
1883 /**
1884  * kvm_s390_update_topology_change_report - update CPU topology change report
1885  * @kvm: guest KVM description
1886  * @val: set or clear the MTCR bit
1887  *
1888  * Updates the Multiprocessor Topology-Change-Report bit to signal
1889  * the guest with a topology change.
1890  * This is only relevant if the topology facility is present.
1891  *
1892  * The SCA version, bsca or esca, doesn't matter as offset is the same.
1893  */
1894 static void kvm_s390_update_topology_change_report(struct kvm *kvm, bool val)
1895 {
1896 	union sca_utility new, old;
1897 	struct bsca_block *sca;
1898 
1899 	read_lock(&kvm->arch.sca_lock);
1900 	sca = kvm->arch.sca;
1901 	do {
1902 		old = READ_ONCE(sca->utility);
1903 		new = old;
1904 		new.mtcr = val;
1905 	} while (cmpxchg(&sca->utility.val, old.val, new.val) != old.val);
1906 	read_unlock(&kvm->arch.sca_lock);
1907 }
1908 
1909 static int kvm_s390_set_topo_change_indication(struct kvm *kvm,
1910 					       struct kvm_device_attr *attr)
1911 {
1912 	if (!test_kvm_facility(kvm, 11))
1913 		return -ENXIO;
1914 
1915 	kvm_s390_update_topology_change_report(kvm, !!attr->attr);
1916 	return 0;
1917 }
1918 
1919 static int kvm_s390_get_topo_change_indication(struct kvm *kvm,
1920 					       struct kvm_device_attr *attr)
1921 {
1922 	u8 topo;
1923 
1924 	if (!test_kvm_facility(kvm, 11))
1925 		return -ENXIO;
1926 
1927 	read_lock(&kvm->arch.sca_lock);
1928 	topo = ((struct bsca_block *)kvm->arch.sca)->utility.mtcr;
1929 	read_unlock(&kvm->arch.sca_lock);
1930 
1931 	return put_user(topo, (u8 __user *)attr->addr);
1932 }
1933 
1934 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1935 {
1936 	int ret;
1937 
1938 	switch (attr->group) {
1939 	case KVM_S390_VM_MEM_CTRL:
1940 		ret = kvm_s390_set_mem_control(kvm, attr);
1941 		break;
1942 	case KVM_S390_VM_TOD:
1943 		ret = kvm_s390_set_tod(kvm, attr);
1944 		break;
1945 	case KVM_S390_VM_CPU_MODEL:
1946 		ret = kvm_s390_set_cpu_model(kvm, attr);
1947 		break;
1948 	case KVM_S390_VM_CRYPTO:
1949 		ret = kvm_s390_vm_set_crypto(kvm, attr);
1950 		break;
1951 	case KVM_S390_VM_MIGRATION:
1952 		ret = kvm_s390_vm_set_migration(kvm, attr);
1953 		break;
1954 	case KVM_S390_VM_CPU_TOPOLOGY:
1955 		ret = kvm_s390_set_topo_change_indication(kvm, attr);
1956 		break;
1957 	default:
1958 		ret = -ENXIO;
1959 		break;
1960 	}
1961 
1962 	return ret;
1963 }
1964 
1965 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1966 {
1967 	int ret;
1968 
1969 	switch (attr->group) {
1970 	case KVM_S390_VM_MEM_CTRL:
1971 		ret = kvm_s390_get_mem_control(kvm, attr);
1972 		break;
1973 	case KVM_S390_VM_TOD:
1974 		ret = kvm_s390_get_tod(kvm, attr);
1975 		break;
1976 	case KVM_S390_VM_CPU_MODEL:
1977 		ret = kvm_s390_get_cpu_model(kvm, attr);
1978 		break;
1979 	case KVM_S390_VM_MIGRATION:
1980 		ret = kvm_s390_vm_get_migration(kvm, attr);
1981 		break;
1982 	case KVM_S390_VM_CPU_TOPOLOGY:
1983 		ret = kvm_s390_get_topo_change_indication(kvm, attr);
1984 		break;
1985 	default:
1986 		ret = -ENXIO;
1987 		break;
1988 	}
1989 
1990 	return ret;
1991 }
1992 
1993 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1994 {
1995 	int ret;
1996 
1997 	switch (attr->group) {
1998 	case KVM_S390_VM_MEM_CTRL:
1999 		switch (attr->attr) {
2000 		case KVM_S390_VM_MEM_ENABLE_CMMA:
2001 		case KVM_S390_VM_MEM_CLR_CMMA:
2002 			ret = sclp.has_cmma ? 0 : -ENXIO;
2003 			break;
2004 		case KVM_S390_VM_MEM_LIMIT_SIZE:
2005 			ret = 0;
2006 			break;
2007 		default:
2008 			ret = -ENXIO;
2009 			break;
2010 		}
2011 		break;
2012 	case KVM_S390_VM_TOD:
2013 		switch (attr->attr) {
2014 		case KVM_S390_VM_TOD_LOW:
2015 		case KVM_S390_VM_TOD_HIGH:
2016 			ret = 0;
2017 			break;
2018 		default:
2019 			ret = -ENXIO;
2020 			break;
2021 		}
2022 		break;
2023 	case KVM_S390_VM_CPU_MODEL:
2024 		switch (attr->attr) {
2025 		case KVM_S390_VM_CPU_PROCESSOR:
2026 		case KVM_S390_VM_CPU_MACHINE:
2027 		case KVM_S390_VM_CPU_PROCESSOR_FEAT:
2028 		case KVM_S390_VM_CPU_MACHINE_FEAT:
2029 		case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
2030 		case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
2031 		case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST:
2032 		case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST:
2033 			ret = 0;
2034 			break;
2035 		default:
2036 			ret = -ENXIO;
2037 			break;
2038 		}
2039 		break;
2040 	case KVM_S390_VM_CRYPTO:
2041 		switch (attr->attr) {
2042 		case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
2043 		case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
2044 		case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
2045 		case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
2046 			ret = 0;
2047 			break;
2048 		case KVM_S390_VM_CRYPTO_ENABLE_APIE:
2049 		case KVM_S390_VM_CRYPTO_DISABLE_APIE:
2050 			ret = ap_instructions_available() ? 0 : -ENXIO;
2051 			break;
2052 		default:
2053 			ret = -ENXIO;
2054 			break;
2055 		}
2056 		break;
2057 	case KVM_S390_VM_MIGRATION:
2058 		ret = 0;
2059 		break;
2060 	case KVM_S390_VM_CPU_TOPOLOGY:
2061 		ret = test_kvm_facility(kvm, 11) ? 0 : -ENXIO;
2062 		break;
2063 	default:
2064 		ret = -ENXIO;
2065 		break;
2066 	}
2067 
2068 	return ret;
2069 }
2070 
2071 static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
2072 {
2073 	uint8_t *keys;
2074 	uint64_t hva;
2075 	int srcu_idx, i, r = 0;
2076 
2077 	if (args->flags != 0)
2078 		return -EINVAL;
2079 
2080 	/* Is this guest using storage keys? */
2081 	if (!mm_uses_skeys(current->mm))
2082 		return KVM_S390_GET_SKEYS_NONE;
2083 
2084 	/* Enforce sane limit on memory allocation */
2085 	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
2086 		return -EINVAL;
2087 
2088 	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT);
2089 	if (!keys)
2090 		return -ENOMEM;
2091 
2092 	mmap_read_lock(current->mm);
2093 	srcu_idx = srcu_read_lock(&kvm->srcu);
2094 	for (i = 0; i < args->count; i++) {
2095 		hva = gfn_to_hva(kvm, args->start_gfn + i);
2096 		if (kvm_is_error_hva(hva)) {
2097 			r = -EFAULT;
2098 			break;
2099 		}
2100 
2101 		r = get_guest_storage_key(current->mm, hva, &keys[i]);
2102 		if (r)
2103 			break;
2104 	}
2105 	srcu_read_unlock(&kvm->srcu, srcu_idx);
2106 	mmap_read_unlock(current->mm);
2107 
2108 	if (!r) {
2109 		r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
2110 				 sizeof(uint8_t) * args->count);
2111 		if (r)
2112 			r = -EFAULT;
2113 	}
2114 
2115 	kvfree(keys);
2116 	return r;
2117 }
2118 
2119 static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
2120 {
2121 	uint8_t *keys;
2122 	uint64_t hva;
2123 	int srcu_idx, i, r = 0;
2124 	bool unlocked;
2125 
2126 	if (args->flags != 0)
2127 		return -EINVAL;
2128 
2129 	/* Enforce sane limit on memory allocation */
2130 	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
2131 		return -EINVAL;
2132 
2133 	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT);
2134 	if (!keys)
2135 		return -ENOMEM;
2136 
2137 	r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
2138 			   sizeof(uint8_t) * args->count);
2139 	if (r) {
2140 		r = -EFAULT;
2141 		goto out;
2142 	}
2143 
2144 	/* Enable storage key handling for the guest */
2145 	r = s390_enable_skey();
2146 	if (r)
2147 		goto out;
2148 
2149 	i = 0;
2150 	mmap_read_lock(current->mm);
2151 	srcu_idx = srcu_read_lock(&kvm->srcu);
2152         while (i < args->count) {
2153 		unlocked = false;
2154 		hva = gfn_to_hva(kvm, args->start_gfn + i);
2155 		if (kvm_is_error_hva(hva)) {
2156 			r = -EFAULT;
2157 			break;
2158 		}
2159 
2160 		/* Lowest order bit is reserved */
2161 		if (keys[i] & 0x01) {
2162 			r = -EINVAL;
2163 			break;
2164 		}
2165 
2166 		r = set_guest_storage_key(current->mm, hva, keys[i], 0);
2167 		if (r) {
2168 			r = fixup_user_fault(current->mm, hva,
2169 					     FAULT_FLAG_WRITE, &unlocked);
2170 			if (r)
2171 				break;
2172 		}
2173 		if (!r)
2174 			i++;
2175 	}
2176 	srcu_read_unlock(&kvm->srcu, srcu_idx);
2177 	mmap_read_unlock(current->mm);
2178 out:
2179 	kvfree(keys);
2180 	return r;
2181 }
2182 
2183 /*
2184  * Base address and length must be sent at the start of each block, therefore
2185  * it's cheaper to send some clean data, as long as it's less than the size of
2186  * two longs.
2187  */
2188 #define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
2189 /* for consistency */
2190 #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
2191 
2192 static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
2193 			      u8 *res, unsigned long bufsize)
2194 {
2195 	unsigned long pgstev, hva, cur_gfn = args->start_gfn;
2196 
2197 	args->count = 0;
2198 	while (args->count < bufsize) {
2199 		hva = gfn_to_hva(kvm, cur_gfn);
2200 		/*
2201 		 * We return an error if the first value was invalid, but we
2202 		 * return successfully if at least one value was copied.
2203 		 */
2204 		if (kvm_is_error_hva(hva))
2205 			return args->count ? 0 : -EFAULT;
2206 		if (get_pgste(kvm->mm, hva, &pgstev) < 0)
2207 			pgstev = 0;
2208 		res[args->count++] = (pgstev >> 24) & 0x43;
2209 		cur_gfn++;
2210 	}
2211 
2212 	return 0;
2213 }
2214 
2215 static struct kvm_memory_slot *gfn_to_memslot_approx(struct kvm_memslots *slots,
2216 						     gfn_t gfn)
2217 {
2218 	return ____gfn_to_memslot(slots, gfn, true);
2219 }
2220 
2221 static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots,
2222 					      unsigned long cur_gfn)
2223 {
2224 	struct kvm_memory_slot *ms = gfn_to_memslot_approx(slots, cur_gfn);
2225 	unsigned long ofs = cur_gfn - ms->base_gfn;
2226 	struct rb_node *mnode = &ms->gfn_node[slots->node_idx];
2227 
2228 	if (ms->base_gfn + ms->npages <= cur_gfn) {
2229 		mnode = rb_next(mnode);
2230 		/* If we are above the highest slot, wrap around */
2231 		if (!mnode)
2232 			mnode = rb_first(&slots->gfn_tree);
2233 
2234 		ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]);
2235 		ofs = 0;
2236 	}
2237 
2238 	if (cur_gfn < ms->base_gfn)
2239 		ofs = 0;
2240 
2241 	ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs);
2242 	while (ofs >= ms->npages && (mnode = rb_next(mnode))) {
2243 		ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]);
2244 		ofs = find_first_bit(kvm_second_dirty_bitmap(ms), ms->npages);
2245 	}
2246 	return ms->base_gfn + ofs;
2247 }
2248 
2249 static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
2250 			     u8 *res, unsigned long bufsize)
2251 {
2252 	unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev;
2253 	struct kvm_memslots *slots = kvm_memslots(kvm);
2254 	struct kvm_memory_slot *ms;
2255 
2256 	if (unlikely(kvm_memslots_empty(slots)))
2257 		return 0;
2258 
2259 	cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn);
2260 	ms = gfn_to_memslot(kvm, cur_gfn);
2261 	args->count = 0;
2262 	args->start_gfn = cur_gfn;
2263 	if (!ms)
2264 		return 0;
2265 	next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
2266 	mem_end = kvm_s390_get_gfn_end(slots);
2267 
2268 	while (args->count < bufsize) {
2269 		hva = gfn_to_hva(kvm, cur_gfn);
2270 		if (kvm_is_error_hva(hva))
2271 			return 0;
2272 		/* Decrement only if we actually flipped the bit to 0 */
2273 		if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
2274 			atomic64_dec(&kvm->arch.cmma_dirty_pages);
2275 		if (get_pgste(kvm->mm, hva, &pgstev) < 0)
2276 			pgstev = 0;
2277 		/* Save the value */
2278 		res[args->count++] = (pgstev >> 24) & 0x43;
2279 		/* If the next bit is too far away, stop. */
2280 		if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE)
2281 			return 0;
2282 		/* If we reached the previous "next", find the next one */
2283 		if (cur_gfn == next_gfn)
2284 			next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
2285 		/* Reached the end of memory or of the buffer, stop */
2286 		if ((next_gfn >= mem_end) ||
2287 		    (next_gfn - args->start_gfn >= bufsize))
2288 			return 0;
2289 		cur_gfn++;
2290 		/* Reached the end of the current memslot, take the next one. */
2291 		if (cur_gfn - ms->base_gfn >= ms->npages) {
2292 			ms = gfn_to_memslot(kvm, cur_gfn);
2293 			if (!ms)
2294 				return 0;
2295 		}
2296 	}
2297 	return 0;
2298 }
2299 
2300 /*
2301  * This function searches for the next page with dirty CMMA attributes, and
2302  * saves the attributes in the buffer up to either the end of the buffer or
2303  * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
2304  * no trailing clean bytes are saved.
2305  * In case no dirty bits were found, or if CMMA was not enabled or used, the
2306  * output buffer will indicate 0 as length.
2307  */
2308 static int kvm_s390_get_cmma_bits(struct kvm *kvm,
2309 				  struct kvm_s390_cmma_log *args)
2310 {
2311 	unsigned long bufsize;
2312 	int srcu_idx, peek, ret;
2313 	u8 *values;
2314 
2315 	if (!kvm->arch.use_cmma)
2316 		return -ENXIO;
2317 	/* Invalid/unsupported flags were specified */
2318 	if (args->flags & ~KVM_S390_CMMA_PEEK)
2319 		return -EINVAL;
2320 	/* Migration mode query, and we are not doing a migration */
2321 	peek = !!(args->flags & KVM_S390_CMMA_PEEK);
2322 	if (!peek && !kvm->arch.migration_mode)
2323 		return -EINVAL;
2324 	/* CMMA is disabled or was not used, or the buffer has length zero */
2325 	bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
2326 	if (!bufsize || !kvm->mm->context.uses_cmm) {
2327 		memset(args, 0, sizeof(*args));
2328 		return 0;
2329 	}
2330 	/* We are not peeking, and there are no dirty pages */
2331 	if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) {
2332 		memset(args, 0, sizeof(*args));
2333 		return 0;
2334 	}
2335 
2336 	values = vmalloc(bufsize);
2337 	if (!values)
2338 		return -ENOMEM;
2339 
2340 	mmap_read_lock(kvm->mm);
2341 	srcu_idx = srcu_read_lock(&kvm->srcu);
2342 	if (peek)
2343 		ret = kvm_s390_peek_cmma(kvm, args, values, bufsize);
2344 	else
2345 		ret = kvm_s390_get_cmma(kvm, args, values, bufsize);
2346 	srcu_read_unlock(&kvm->srcu, srcu_idx);
2347 	mmap_read_unlock(kvm->mm);
2348 
2349 	if (kvm->arch.migration_mode)
2350 		args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages);
2351 	else
2352 		args->remaining = 0;
2353 
2354 	if (copy_to_user((void __user *)args->values, values, args->count))
2355 		ret = -EFAULT;
2356 
2357 	vfree(values);
2358 	return ret;
2359 }
2360 
2361 /*
2362  * This function sets the CMMA attributes for the given pages. If the input
2363  * buffer has zero length, no action is taken, otherwise the attributes are
2364  * set and the mm->context.uses_cmm flag is set.
2365  */
2366 static int kvm_s390_set_cmma_bits(struct kvm *kvm,
2367 				  const struct kvm_s390_cmma_log *args)
2368 {
2369 	unsigned long hva, mask, pgstev, i;
2370 	uint8_t *bits;
2371 	int srcu_idx, r = 0;
2372 
2373 	mask = args->mask;
2374 
2375 	if (!kvm->arch.use_cmma)
2376 		return -ENXIO;
2377 	/* invalid/unsupported flags */
2378 	if (args->flags != 0)
2379 		return -EINVAL;
2380 	/* Enforce sane limit on memory allocation */
2381 	if (args->count > KVM_S390_CMMA_SIZE_MAX)
2382 		return -EINVAL;
2383 	/* Nothing to do */
2384 	if (args->count == 0)
2385 		return 0;
2386 
2387 	bits = vmalloc(array_size(sizeof(*bits), args->count));
2388 	if (!bits)
2389 		return -ENOMEM;
2390 
2391 	r = copy_from_user(bits, (void __user *)args->values, args->count);
2392 	if (r) {
2393 		r = -EFAULT;
2394 		goto out;
2395 	}
2396 
2397 	mmap_read_lock(kvm->mm);
2398 	srcu_idx = srcu_read_lock(&kvm->srcu);
2399 	for (i = 0; i < args->count; i++) {
2400 		hva = gfn_to_hva(kvm, args->start_gfn + i);
2401 		if (kvm_is_error_hva(hva)) {
2402 			r = -EFAULT;
2403 			break;
2404 		}
2405 
2406 		pgstev = bits[i];
2407 		pgstev = pgstev << 24;
2408 		mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
2409 		set_pgste_bits(kvm->mm, hva, mask, pgstev);
2410 	}
2411 	srcu_read_unlock(&kvm->srcu, srcu_idx);
2412 	mmap_read_unlock(kvm->mm);
2413 
2414 	if (!kvm->mm->context.uses_cmm) {
2415 		mmap_write_lock(kvm->mm);
2416 		kvm->mm->context.uses_cmm = 1;
2417 		mmap_write_unlock(kvm->mm);
2418 	}
2419 out:
2420 	vfree(bits);
2421 	return r;
2422 }
2423 
2424 /**
2425  * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to
2426  * non protected.
2427  * @kvm: the VM whose protected vCPUs are to be converted
2428  * @rc: return value for the RC field of the UVC (in case of error)
2429  * @rrc: return value for the RRC field of the UVC (in case of error)
2430  *
2431  * Does not stop in case of error, tries to convert as many
2432  * CPUs as possible. In case of error, the RC and RRC of the last error are
2433  * returned.
2434  *
2435  * Return: 0 in case of success, otherwise -EIO
2436  */
2437 int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
2438 {
2439 	struct kvm_vcpu *vcpu;
2440 	unsigned long i;
2441 	u16 _rc, _rrc;
2442 	int ret = 0;
2443 
2444 	/*
2445 	 * We ignore failures and try to destroy as many CPUs as possible.
2446 	 * At the same time we must not free the assigned resources when
2447 	 * this fails, as the ultravisor has still access to that memory.
2448 	 * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak
2449 	 * behind.
2450 	 * We want to return the first failure rc and rrc, though.
2451 	 */
2452 	kvm_for_each_vcpu(i, vcpu, kvm) {
2453 		mutex_lock(&vcpu->mutex);
2454 		if (kvm_s390_pv_destroy_cpu(vcpu, &_rc, &_rrc) && !ret) {
2455 			*rc = _rc;
2456 			*rrc = _rrc;
2457 			ret = -EIO;
2458 		}
2459 		mutex_unlock(&vcpu->mutex);
2460 	}
2461 	/* Ensure that we re-enable gisa if the non-PV guest used it but the PV guest did not. */
2462 	if (use_gisa)
2463 		kvm_s390_gisa_enable(kvm);
2464 	return ret;
2465 }
2466 
2467 /**
2468  * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM
2469  * to protected.
2470  * @kvm: the VM whose protected vCPUs are to be converted
2471  * @rc: return value for the RC field of the UVC (in case of error)
2472  * @rrc: return value for the RRC field of the UVC (in case of error)
2473  *
2474  * Tries to undo the conversion in case of error.
2475  *
2476  * Return: 0 in case of success, otherwise -EIO
2477  */
2478 static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
2479 {
2480 	unsigned long i;
2481 	int r = 0;
2482 	u16 dummy;
2483 
2484 	struct kvm_vcpu *vcpu;
2485 
2486 	/* Disable the GISA if the ultravisor does not support AIV. */
2487 	if (!uv_has_feature(BIT_UV_FEAT_AIV))
2488 		kvm_s390_gisa_disable(kvm);
2489 
2490 	kvm_for_each_vcpu(i, vcpu, kvm) {
2491 		mutex_lock(&vcpu->mutex);
2492 		r = kvm_s390_pv_create_cpu(vcpu, rc, rrc);
2493 		mutex_unlock(&vcpu->mutex);
2494 		if (r)
2495 			break;
2496 	}
2497 	if (r)
2498 		kvm_s390_cpus_from_pv(kvm, &dummy, &dummy);
2499 	return r;
2500 }
2501 
2502 /*
2503  * Here we provide user space with a direct interface to query UV
2504  * related data like UV maxima and available features as well as
2505  * feature specific data.
2506  *
2507  * To facilitate future extension of the data structures we'll try to
2508  * write data up to the maximum requested length.
2509  */
2510 static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info)
2511 {
2512 	ssize_t len_min;
2513 
2514 	switch (info->header.id) {
2515 	case KVM_PV_INFO_VM: {
2516 		len_min =  sizeof(info->header) + sizeof(info->vm);
2517 
2518 		if (info->header.len_max < len_min)
2519 			return -EINVAL;
2520 
2521 		memcpy(info->vm.inst_calls_list,
2522 		       uv_info.inst_calls_list,
2523 		       sizeof(uv_info.inst_calls_list));
2524 
2525 		/* It's max cpuid not max cpus, so it's off by one */
2526 		info->vm.max_cpus = uv_info.max_guest_cpu_id + 1;
2527 		info->vm.max_guests = uv_info.max_num_sec_conf;
2528 		info->vm.max_guest_addr = uv_info.max_sec_stor_addr;
2529 		info->vm.feature_indication = uv_info.uv_feature_indications;
2530 
2531 		return len_min;
2532 	}
2533 	case KVM_PV_INFO_DUMP: {
2534 		len_min =  sizeof(info->header) + sizeof(info->dump);
2535 
2536 		if (info->header.len_max < len_min)
2537 			return -EINVAL;
2538 
2539 		info->dump.dump_cpu_buffer_len = uv_info.guest_cpu_stor_len;
2540 		info->dump.dump_config_mem_buffer_per_1m = uv_info.conf_dump_storage_state_len;
2541 		info->dump.dump_config_finalize_len = uv_info.conf_dump_finalize_len;
2542 		return len_min;
2543 	}
2544 	default:
2545 		return -EINVAL;
2546 	}
2547 }
2548 
2549 static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd,
2550 			   struct kvm_s390_pv_dmp dmp)
2551 {
2552 	int r = -EINVAL;
2553 	void __user *result_buff = (void __user *)dmp.buff_addr;
2554 
2555 	switch (dmp.subcmd) {
2556 	case KVM_PV_DUMP_INIT: {
2557 		if (kvm->arch.pv.dumping)
2558 			break;
2559 
2560 		/*
2561 		 * Block SIE entry as concurrent dump UVCs could lead
2562 		 * to validities.
2563 		 */
2564 		kvm_s390_vcpu_block_all(kvm);
2565 
2566 		r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2567 				  UVC_CMD_DUMP_INIT, &cmd->rc, &cmd->rrc);
2568 		KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP INIT: rc %x rrc %x",
2569 			     cmd->rc, cmd->rrc);
2570 		if (!r) {
2571 			kvm->arch.pv.dumping = true;
2572 		} else {
2573 			kvm_s390_vcpu_unblock_all(kvm);
2574 			r = -EINVAL;
2575 		}
2576 		break;
2577 	}
2578 	case KVM_PV_DUMP_CONFIG_STOR_STATE: {
2579 		if (!kvm->arch.pv.dumping)
2580 			break;
2581 
2582 		/*
2583 		 * gaddr is an output parameter since we might stop
2584 		 * early. As dmp will be copied back in our caller, we
2585 		 * don't need to do it ourselves.
2586 		 */
2587 		r = kvm_s390_pv_dump_stor_state(kvm, result_buff, &dmp.gaddr, dmp.buff_len,
2588 						&cmd->rc, &cmd->rrc);
2589 		break;
2590 	}
2591 	case KVM_PV_DUMP_COMPLETE: {
2592 		if (!kvm->arch.pv.dumping)
2593 			break;
2594 
2595 		r = -EINVAL;
2596 		if (dmp.buff_len < uv_info.conf_dump_finalize_len)
2597 			break;
2598 
2599 		r = kvm_s390_pv_dump_complete(kvm, result_buff,
2600 					      &cmd->rc, &cmd->rrc);
2601 		break;
2602 	}
2603 	default:
2604 		r = -ENOTTY;
2605 		break;
2606 	}
2607 
2608 	return r;
2609 }
2610 
2611 static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
2612 {
2613 	const bool need_lock = (cmd->cmd != KVM_PV_ASYNC_CLEANUP_PERFORM);
2614 	void __user *argp = (void __user *)cmd->data;
2615 	int r = 0;
2616 	u16 dummy;
2617 
2618 	if (need_lock)
2619 		mutex_lock(&kvm->lock);
2620 
2621 	switch (cmd->cmd) {
2622 	case KVM_PV_ENABLE: {
2623 		r = -EINVAL;
2624 		if (kvm_s390_pv_is_protected(kvm))
2625 			break;
2626 
2627 		/*
2628 		 *  FMT 4 SIE needs esca. As we never switch back to bsca from
2629 		 *  esca, we need no cleanup in the error cases below
2630 		 */
2631 		r = sca_switch_to_extended(kvm);
2632 		if (r)
2633 			break;
2634 
2635 		mmap_write_lock(current->mm);
2636 		r = gmap_mark_unmergeable();
2637 		mmap_write_unlock(current->mm);
2638 		if (r)
2639 			break;
2640 
2641 		r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc);
2642 		if (r)
2643 			break;
2644 
2645 		r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc);
2646 		if (r)
2647 			kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy);
2648 
2649 		/* we need to block service interrupts from now on */
2650 		set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
2651 		break;
2652 	}
2653 	case KVM_PV_ASYNC_CLEANUP_PREPARE:
2654 		r = -EINVAL;
2655 		if (!kvm_s390_pv_is_protected(kvm) || !async_destroy)
2656 			break;
2657 
2658 		r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc);
2659 		/*
2660 		 * If a CPU could not be destroyed, destroy VM will also fail.
2661 		 * There is no point in trying to destroy it. Instead return
2662 		 * the rc and rrc from the first CPU that failed destroying.
2663 		 */
2664 		if (r)
2665 			break;
2666 		r = kvm_s390_pv_set_aside(kvm, &cmd->rc, &cmd->rrc);
2667 
2668 		/* no need to block service interrupts any more */
2669 		clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
2670 		break;
2671 	case KVM_PV_ASYNC_CLEANUP_PERFORM:
2672 		r = -EINVAL;
2673 		if (!async_destroy)
2674 			break;
2675 		/* kvm->lock must not be held; this is asserted inside the function. */
2676 		r = kvm_s390_pv_deinit_aside_vm(kvm, &cmd->rc, &cmd->rrc);
2677 		break;
2678 	case KVM_PV_DISABLE: {
2679 		r = -EINVAL;
2680 		if (!kvm_s390_pv_is_protected(kvm))
2681 			break;
2682 
2683 		r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc);
2684 		/*
2685 		 * If a CPU could not be destroyed, destroy VM will also fail.
2686 		 * There is no point in trying to destroy it. Instead return
2687 		 * the rc and rrc from the first CPU that failed destroying.
2688 		 */
2689 		if (r)
2690 			break;
2691 		r = kvm_s390_pv_deinit_cleanup_all(kvm, &cmd->rc, &cmd->rrc);
2692 
2693 		/* no need to block service interrupts any more */
2694 		clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
2695 		break;
2696 	}
2697 	case KVM_PV_SET_SEC_PARMS: {
2698 		struct kvm_s390_pv_sec_parm parms = {};
2699 		void *hdr;
2700 
2701 		r = -EINVAL;
2702 		if (!kvm_s390_pv_is_protected(kvm))
2703 			break;
2704 
2705 		r = -EFAULT;
2706 		if (copy_from_user(&parms, argp, sizeof(parms)))
2707 			break;
2708 
2709 		/* Currently restricted to 8KB */
2710 		r = -EINVAL;
2711 		if (parms.length > PAGE_SIZE * 2)
2712 			break;
2713 
2714 		r = -ENOMEM;
2715 		hdr = vmalloc(parms.length);
2716 		if (!hdr)
2717 			break;
2718 
2719 		r = -EFAULT;
2720 		if (!copy_from_user(hdr, (void __user *)parms.origin,
2721 				    parms.length))
2722 			r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length,
2723 						      &cmd->rc, &cmd->rrc);
2724 
2725 		vfree(hdr);
2726 		break;
2727 	}
2728 	case KVM_PV_UNPACK: {
2729 		struct kvm_s390_pv_unp unp = {};
2730 
2731 		r = -EINVAL;
2732 		if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm))
2733 			break;
2734 
2735 		r = -EFAULT;
2736 		if (copy_from_user(&unp, argp, sizeof(unp)))
2737 			break;
2738 
2739 		r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak,
2740 				       &cmd->rc, &cmd->rrc);
2741 		break;
2742 	}
2743 	case KVM_PV_VERIFY: {
2744 		r = -EINVAL;
2745 		if (!kvm_s390_pv_is_protected(kvm))
2746 			break;
2747 
2748 		r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2749 				  UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc);
2750 		KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc,
2751 			     cmd->rrc);
2752 		break;
2753 	}
2754 	case KVM_PV_PREP_RESET: {
2755 		r = -EINVAL;
2756 		if (!kvm_s390_pv_is_protected(kvm))
2757 			break;
2758 
2759 		r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2760 				  UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc);
2761 		KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x",
2762 			     cmd->rc, cmd->rrc);
2763 		break;
2764 	}
2765 	case KVM_PV_UNSHARE_ALL: {
2766 		r = -EINVAL;
2767 		if (!kvm_s390_pv_is_protected(kvm))
2768 			break;
2769 
2770 		r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2771 				  UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc);
2772 		KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x",
2773 			     cmd->rc, cmd->rrc);
2774 		break;
2775 	}
2776 	case KVM_PV_INFO: {
2777 		struct kvm_s390_pv_info info = {};
2778 		ssize_t data_len;
2779 
2780 		/*
2781 		 * No need to check the VM protection here.
2782 		 *
2783 		 * Maybe user space wants to query some of the data
2784 		 * when the VM is still unprotected. If we see the
2785 		 * need to fence a new data command we can still
2786 		 * return an error in the info handler.
2787 		 */
2788 
2789 		r = -EFAULT;
2790 		if (copy_from_user(&info, argp, sizeof(info.header)))
2791 			break;
2792 
2793 		r = -EINVAL;
2794 		if (info.header.len_max < sizeof(info.header))
2795 			break;
2796 
2797 		data_len = kvm_s390_handle_pv_info(&info);
2798 		if (data_len < 0) {
2799 			r = data_len;
2800 			break;
2801 		}
2802 		/*
2803 		 * If a data command struct is extended (multiple
2804 		 * times) this can be used to determine how much of it
2805 		 * is valid.
2806 		 */
2807 		info.header.len_written = data_len;
2808 
2809 		r = -EFAULT;
2810 		if (copy_to_user(argp, &info, data_len))
2811 			break;
2812 
2813 		r = 0;
2814 		break;
2815 	}
2816 	case KVM_PV_DUMP: {
2817 		struct kvm_s390_pv_dmp dmp;
2818 
2819 		r = -EINVAL;
2820 		if (!kvm_s390_pv_is_protected(kvm))
2821 			break;
2822 
2823 		r = -EFAULT;
2824 		if (copy_from_user(&dmp, argp, sizeof(dmp)))
2825 			break;
2826 
2827 		r = kvm_s390_pv_dmp(kvm, cmd, dmp);
2828 		if (r)
2829 			break;
2830 
2831 		if (copy_to_user(argp, &dmp, sizeof(dmp))) {
2832 			r = -EFAULT;
2833 			break;
2834 		}
2835 
2836 		break;
2837 	}
2838 	default:
2839 		r = -ENOTTY;
2840 	}
2841 	if (need_lock)
2842 		mutex_unlock(&kvm->lock);
2843 
2844 	return r;
2845 }
2846 
2847 static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_flags)
2848 {
2849 	if (mop->flags & ~supported_flags || !mop->size)
2850 		return -EINVAL;
2851 	if (mop->size > MEM_OP_MAX_SIZE)
2852 		return -E2BIG;
2853 	if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) {
2854 		if (mop->key > 0xf)
2855 			return -EINVAL;
2856 	} else {
2857 		mop->key = 0;
2858 	}
2859 	return 0;
2860 }
2861 
2862 static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop)
2863 {
2864 	void __user *uaddr = (void __user *)mop->buf;
2865 	enum gacc_mode acc_mode;
2866 	void *tmpbuf = NULL;
2867 	int r, srcu_idx;
2868 
2869 	r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION |
2870 					KVM_S390_MEMOP_F_CHECK_ONLY);
2871 	if (r)
2872 		return r;
2873 
2874 	if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
2875 		tmpbuf = vmalloc(mop->size);
2876 		if (!tmpbuf)
2877 			return -ENOMEM;
2878 	}
2879 
2880 	srcu_idx = srcu_read_lock(&kvm->srcu);
2881 
2882 	if (kvm_is_error_gpa(kvm, mop->gaddr)) {
2883 		r = PGM_ADDRESSING;
2884 		goto out_unlock;
2885 	}
2886 
2887 	acc_mode = mop->op == KVM_S390_MEMOP_ABSOLUTE_READ ? GACC_FETCH : GACC_STORE;
2888 	if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
2889 		r = check_gpa_range(kvm, mop->gaddr, mop->size, acc_mode, mop->key);
2890 		goto out_unlock;
2891 	}
2892 	if (acc_mode == GACC_FETCH) {
2893 		r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
2894 					      mop->size, GACC_FETCH, mop->key);
2895 		if (r)
2896 			goto out_unlock;
2897 		if (copy_to_user(uaddr, tmpbuf, mop->size))
2898 			r = -EFAULT;
2899 	} else {
2900 		if (copy_from_user(tmpbuf, uaddr, mop->size)) {
2901 			r = -EFAULT;
2902 			goto out_unlock;
2903 		}
2904 		r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
2905 					      mop->size, GACC_STORE, mop->key);
2906 	}
2907 
2908 out_unlock:
2909 	srcu_read_unlock(&kvm->srcu, srcu_idx);
2910 
2911 	vfree(tmpbuf);
2912 	return r;
2913 }
2914 
2915 static int kvm_s390_vm_mem_op_cmpxchg(struct kvm *kvm, struct kvm_s390_mem_op *mop)
2916 {
2917 	void __user *uaddr = (void __user *)mop->buf;
2918 	void __user *old_addr = (void __user *)mop->old_addr;
2919 	union {
2920 		__uint128_t quad;
2921 		char raw[sizeof(__uint128_t)];
2922 	} old = { .quad = 0}, new = { .quad = 0 };
2923 	unsigned int off_in_quad = sizeof(new) - mop->size;
2924 	int r, srcu_idx;
2925 	bool success;
2926 
2927 	r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION);
2928 	if (r)
2929 		return r;
2930 	/*
2931 	 * This validates off_in_quad. Checking that size is a power
2932 	 * of two is not necessary, as cmpxchg_guest_abs_with_key
2933 	 * takes care of that
2934 	 */
2935 	if (mop->size > sizeof(new))
2936 		return -EINVAL;
2937 	if (copy_from_user(&new.raw[off_in_quad], uaddr, mop->size))
2938 		return -EFAULT;
2939 	if (copy_from_user(&old.raw[off_in_quad], old_addr, mop->size))
2940 		return -EFAULT;
2941 
2942 	srcu_idx = srcu_read_lock(&kvm->srcu);
2943 
2944 	if (kvm_is_error_gpa(kvm, mop->gaddr)) {
2945 		r = PGM_ADDRESSING;
2946 		goto out_unlock;
2947 	}
2948 
2949 	r = cmpxchg_guest_abs_with_key(kvm, mop->gaddr, mop->size, &old.quad,
2950 				       new.quad, mop->key, &success);
2951 	if (!success && copy_to_user(old_addr, &old.raw[off_in_quad], mop->size))
2952 		r = -EFAULT;
2953 
2954 out_unlock:
2955 	srcu_read_unlock(&kvm->srcu, srcu_idx);
2956 	return r;
2957 }
2958 
2959 static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
2960 {
2961 	/*
2962 	 * This is technically a heuristic only, if the kvm->lock is not
2963 	 * taken, it is not guaranteed that the vm is/remains non-protected.
2964 	 * This is ok from a kernel perspective, wrongdoing is detected
2965 	 * on the access, -EFAULT is returned and the vm may crash the
2966 	 * next time it accesses the memory in question.
2967 	 * There is no sane usecase to do switching and a memop on two
2968 	 * different CPUs at the same time.
2969 	 */
2970 	if (kvm_s390_pv_get_handle(kvm))
2971 		return -EINVAL;
2972 
2973 	switch (mop->op) {
2974 	case KVM_S390_MEMOP_ABSOLUTE_READ:
2975 	case KVM_S390_MEMOP_ABSOLUTE_WRITE:
2976 		return kvm_s390_vm_mem_op_abs(kvm, mop);
2977 	case KVM_S390_MEMOP_ABSOLUTE_CMPXCHG:
2978 		return kvm_s390_vm_mem_op_cmpxchg(kvm, mop);
2979 	default:
2980 		return -EINVAL;
2981 	}
2982 }
2983 
2984 int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
2985 {
2986 	struct kvm *kvm = filp->private_data;
2987 	void __user *argp = (void __user *)arg;
2988 	struct kvm_device_attr attr;
2989 	int r;
2990 
2991 	switch (ioctl) {
2992 	case KVM_S390_INTERRUPT: {
2993 		struct kvm_s390_interrupt s390int;
2994 
2995 		r = -EFAULT;
2996 		if (copy_from_user(&s390int, argp, sizeof(s390int)))
2997 			break;
2998 		r = kvm_s390_inject_vm(kvm, &s390int);
2999 		break;
3000 	}
3001 	case KVM_CREATE_IRQCHIP: {
3002 		struct kvm_irq_routing_entry routing;
3003 
3004 		r = -EINVAL;
3005 		if (kvm->arch.use_irqchip) {
3006 			/* Set up dummy routing. */
3007 			memset(&routing, 0, sizeof(routing));
3008 			r = kvm_set_irq_routing(kvm, &routing, 0, 0);
3009 		}
3010 		break;
3011 	}
3012 	case KVM_SET_DEVICE_ATTR: {
3013 		r = -EFAULT;
3014 		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
3015 			break;
3016 		r = kvm_s390_vm_set_attr(kvm, &attr);
3017 		break;
3018 	}
3019 	case KVM_GET_DEVICE_ATTR: {
3020 		r = -EFAULT;
3021 		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
3022 			break;
3023 		r = kvm_s390_vm_get_attr(kvm, &attr);
3024 		break;
3025 	}
3026 	case KVM_HAS_DEVICE_ATTR: {
3027 		r = -EFAULT;
3028 		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
3029 			break;
3030 		r = kvm_s390_vm_has_attr(kvm, &attr);
3031 		break;
3032 	}
3033 	case KVM_S390_GET_SKEYS: {
3034 		struct kvm_s390_skeys args;
3035 
3036 		r = -EFAULT;
3037 		if (copy_from_user(&args, argp,
3038 				   sizeof(struct kvm_s390_skeys)))
3039 			break;
3040 		r = kvm_s390_get_skeys(kvm, &args);
3041 		break;
3042 	}
3043 	case KVM_S390_SET_SKEYS: {
3044 		struct kvm_s390_skeys args;
3045 
3046 		r = -EFAULT;
3047 		if (copy_from_user(&args, argp,
3048 				   sizeof(struct kvm_s390_skeys)))
3049 			break;
3050 		r = kvm_s390_set_skeys(kvm, &args);
3051 		break;
3052 	}
3053 	case KVM_S390_GET_CMMA_BITS: {
3054 		struct kvm_s390_cmma_log args;
3055 
3056 		r = -EFAULT;
3057 		if (copy_from_user(&args, argp, sizeof(args)))
3058 			break;
3059 		mutex_lock(&kvm->slots_lock);
3060 		r = kvm_s390_get_cmma_bits(kvm, &args);
3061 		mutex_unlock(&kvm->slots_lock);
3062 		if (!r) {
3063 			r = copy_to_user(argp, &args, sizeof(args));
3064 			if (r)
3065 				r = -EFAULT;
3066 		}
3067 		break;
3068 	}
3069 	case KVM_S390_SET_CMMA_BITS: {
3070 		struct kvm_s390_cmma_log args;
3071 
3072 		r = -EFAULT;
3073 		if (copy_from_user(&args, argp, sizeof(args)))
3074 			break;
3075 		mutex_lock(&kvm->slots_lock);
3076 		r = kvm_s390_set_cmma_bits(kvm, &args);
3077 		mutex_unlock(&kvm->slots_lock);
3078 		break;
3079 	}
3080 	case KVM_S390_PV_COMMAND: {
3081 		struct kvm_pv_cmd args;
3082 
3083 		/* protvirt means user cpu state */
3084 		kvm_s390_set_user_cpu_state_ctrl(kvm);
3085 		r = 0;
3086 		if (!is_prot_virt_host()) {
3087 			r = -EINVAL;
3088 			break;
3089 		}
3090 		if (copy_from_user(&args, argp, sizeof(args))) {
3091 			r = -EFAULT;
3092 			break;
3093 		}
3094 		if (args.flags) {
3095 			r = -EINVAL;
3096 			break;
3097 		}
3098 		/* must be called without kvm->lock */
3099 		r = kvm_s390_handle_pv(kvm, &args);
3100 		if (copy_to_user(argp, &args, sizeof(args))) {
3101 			r = -EFAULT;
3102 			break;
3103 		}
3104 		break;
3105 	}
3106 	case KVM_S390_MEM_OP: {
3107 		struct kvm_s390_mem_op mem_op;
3108 
3109 		if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
3110 			r = kvm_s390_vm_mem_op(kvm, &mem_op);
3111 		else
3112 			r = -EFAULT;
3113 		break;
3114 	}
3115 	case KVM_S390_ZPCI_OP: {
3116 		struct kvm_s390_zpci_op args;
3117 
3118 		r = -EINVAL;
3119 		if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
3120 			break;
3121 		if (copy_from_user(&args, argp, sizeof(args))) {
3122 			r = -EFAULT;
3123 			break;
3124 		}
3125 		r = kvm_s390_pci_zpci_op(kvm, &args);
3126 		break;
3127 	}
3128 	default:
3129 		r = -ENOTTY;
3130 	}
3131 
3132 	return r;
3133 }
3134 
3135 static int kvm_s390_apxa_installed(void)
3136 {
3137 	struct ap_config_info info;
3138 
3139 	if (ap_instructions_available()) {
3140 		if (ap_qci(&info) == 0)
3141 			return info.apxa;
3142 	}
3143 
3144 	return 0;
3145 }
3146 
3147 /*
3148  * The format of the crypto control block (CRYCB) is specified in the 3 low
3149  * order bits of the CRYCB designation (CRYCBD) field as follows:
3150  * Format 0: Neither the message security assist extension 3 (MSAX3) nor the
3151  *	     AP extended addressing (APXA) facility are installed.
3152  * Format 1: The APXA facility is not installed but the MSAX3 facility is.
3153  * Format 2: Both the APXA and MSAX3 facilities are installed
3154  */
3155 static void kvm_s390_set_crycb_format(struct kvm *kvm)
3156 {
3157 	kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
3158 
3159 	/* Clear the CRYCB format bits - i.e., set format 0 by default */
3160 	kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK);
3161 
3162 	/* Check whether MSAX3 is installed */
3163 	if (!test_kvm_facility(kvm, 76))
3164 		return;
3165 
3166 	if (kvm_s390_apxa_installed())
3167 		kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
3168 	else
3169 		kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
3170 }
3171 
3172 /*
3173  * kvm_arch_crypto_set_masks
3174  *
3175  * @kvm: pointer to the target guest's KVM struct containing the crypto masks
3176  *	 to be set.
3177  * @apm: the mask identifying the accessible AP adapters
3178  * @aqm: the mask identifying the accessible AP domains
3179  * @adm: the mask identifying the accessible AP control domains
3180  *
3181  * Set the masks that identify the adapters, domains and control domains to
3182  * which the KVM guest is granted access.
3183  *
3184  * Note: The kvm->lock mutex must be locked by the caller before invoking this
3185  *	 function.
3186  */
3187 void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
3188 			       unsigned long *aqm, unsigned long *adm)
3189 {
3190 	struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;
3191 
3192 	kvm_s390_vcpu_block_all(kvm);
3193 
3194 	switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
3195 	case CRYCB_FORMAT2: /* APCB1 use 256 bits */
3196 		memcpy(crycb->apcb1.apm, apm, 32);
3197 		VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
3198 			 apm[0], apm[1], apm[2], apm[3]);
3199 		memcpy(crycb->apcb1.aqm, aqm, 32);
3200 		VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
3201 			 aqm[0], aqm[1], aqm[2], aqm[3]);
3202 		memcpy(crycb->apcb1.adm, adm, 32);
3203 		VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
3204 			 adm[0], adm[1], adm[2], adm[3]);
3205 		break;
3206 	case CRYCB_FORMAT1:
3207 	case CRYCB_FORMAT0: /* Fall through both use APCB0 */
3208 		memcpy(crycb->apcb0.apm, apm, 8);
3209 		memcpy(crycb->apcb0.aqm, aqm, 2);
3210 		memcpy(crycb->apcb0.adm, adm, 2);
3211 		VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
3212 			 apm[0], *((unsigned short *)aqm),
3213 			 *((unsigned short *)adm));
3214 		break;
3215 	default:	/* Can not happen */
3216 		break;
3217 	}
3218 
3219 	/* recreate the shadow crycb for each vcpu */
3220 	kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
3221 	kvm_s390_vcpu_unblock_all(kvm);
3222 }
3223 EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);
3224 
3225 /*
3226  * kvm_arch_crypto_clear_masks
3227  *
3228  * @kvm: pointer to the target guest's KVM struct containing the crypto masks
3229  *	 to be cleared.
3230  *
3231  * Clear the masks that identify the adapters, domains and control domains to
3232  * which the KVM guest is granted access.
3233  *
3234  * Note: The kvm->lock mutex must be locked by the caller before invoking this
3235  *	 function.
3236  */
3237 void kvm_arch_crypto_clear_masks(struct kvm *kvm)
3238 {
3239 	kvm_s390_vcpu_block_all(kvm);
3240 
3241 	memset(&kvm->arch.crypto.crycb->apcb0, 0,
3242 	       sizeof(kvm->arch.crypto.crycb->apcb0));
3243 	memset(&kvm->arch.crypto.crycb->apcb1, 0,
3244 	       sizeof(kvm->arch.crypto.crycb->apcb1));
3245 
3246 	VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
3247 	/* recreate the shadow crycb for each vcpu */
3248 	kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
3249 	kvm_s390_vcpu_unblock_all(kvm);
3250 }
3251 EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks);
3252 
3253 static u64 kvm_s390_get_initial_cpuid(void)
3254 {
3255 	struct cpuid cpuid;
3256 
3257 	get_cpu_id(&cpuid);
3258 	cpuid.version = 0xff;
3259 	return *((u64 *) &cpuid);
3260 }
3261 
3262 static void kvm_s390_crypto_init(struct kvm *kvm)
3263 {
3264 	kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
3265 	kvm_s390_set_crycb_format(kvm);
3266 	init_rwsem(&kvm->arch.crypto.pqap_hook_rwsem);
3267 
3268 	if (!test_kvm_facility(kvm, 76))
3269 		return;
3270 
3271 	/* Enable AES/DEA protected key functions by default */
3272 	kvm->arch.crypto.aes_kw = 1;
3273 	kvm->arch.crypto.dea_kw = 1;
3274 	get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
3275 			 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
3276 	get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
3277 			 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
3278 }
3279 
3280 static void sca_dispose(struct kvm *kvm)
3281 {
3282 	if (kvm->arch.use_esca)
3283 		free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
3284 	else
3285 		free_page((unsigned long)(kvm->arch.sca));
3286 	kvm->arch.sca = NULL;
3287 }
3288 
3289 void kvm_arch_free_vm(struct kvm *kvm)
3290 {
3291 	if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
3292 		kvm_s390_pci_clear_list(kvm);
3293 
3294 	__kvm_arch_free_vm(kvm);
3295 }
3296 
3297 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
3298 {
3299 	gfp_t alloc_flags = GFP_KERNEL_ACCOUNT;
3300 	int i, rc;
3301 	char debug_name[16];
3302 	static unsigned long sca_offset;
3303 
3304 	rc = -EINVAL;
3305 #ifdef CONFIG_KVM_S390_UCONTROL
3306 	if (type & ~KVM_VM_S390_UCONTROL)
3307 		goto out_err;
3308 	if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
3309 		goto out_err;
3310 #else
3311 	if (type)
3312 		goto out_err;
3313 #endif
3314 
3315 	rc = s390_enable_sie();
3316 	if (rc)
3317 		goto out_err;
3318 
3319 	rc = -ENOMEM;
3320 
3321 	if (!sclp.has_64bscao)
3322 		alloc_flags |= GFP_DMA;
3323 	rwlock_init(&kvm->arch.sca_lock);
3324 	/* start with basic SCA */
3325 	kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
3326 	if (!kvm->arch.sca)
3327 		goto out_err;
3328 	mutex_lock(&kvm_lock);
3329 	sca_offset += 16;
3330 	if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
3331 		sca_offset = 0;
3332 	kvm->arch.sca = (struct bsca_block *)
3333 			((char *) kvm->arch.sca + sca_offset);
3334 	mutex_unlock(&kvm_lock);
3335 
3336 	sprintf(debug_name, "kvm-%u", current->pid);
3337 
3338 	kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
3339 	if (!kvm->arch.dbf)
3340 		goto out_err;
3341 
3342 	BUILD_BUG_ON(sizeof(struct sie_page2) != 4096);
3343 	kvm->arch.sie_page2 =
3344 	     (struct sie_page2 *) get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA);
3345 	if (!kvm->arch.sie_page2)
3346 		goto out_err;
3347 
3348 	kvm->arch.sie_page2->kvm = kvm;
3349 	kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
3350 
3351 	for (i = 0; i < kvm_s390_fac_size(); i++) {
3352 		kvm->arch.model.fac_mask[i] = stfle_fac_list[i] &
3353 					      (kvm_s390_fac_base[i] |
3354 					       kvm_s390_fac_ext[i]);
3355 		kvm->arch.model.fac_list[i] = stfle_fac_list[i] &
3356 					      kvm_s390_fac_base[i];
3357 	}
3358 	kvm->arch.model.subfuncs = kvm_s390_available_subfunc;
3359 
3360 	/* we are always in czam mode - even on pre z14 machines */
3361 	set_kvm_facility(kvm->arch.model.fac_mask, 138);
3362 	set_kvm_facility(kvm->arch.model.fac_list, 138);
3363 	/* we emulate STHYI in kvm */
3364 	set_kvm_facility(kvm->arch.model.fac_mask, 74);
3365 	set_kvm_facility(kvm->arch.model.fac_list, 74);
3366 	if (MACHINE_HAS_TLB_GUEST) {
3367 		set_kvm_facility(kvm->arch.model.fac_mask, 147);
3368 		set_kvm_facility(kvm->arch.model.fac_list, 147);
3369 	}
3370 
3371 	if (css_general_characteristics.aiv && test_facility(65))
3372 		set_kvm_facility(kvm->arch.model.fac_mask, 65);
3373 
3374 	kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
3375 	kvm->arch.model.ibc = sclp.ibc & 0x0fff;
3376 
3377 	kvm->arch.model.uv_feat_guest.feat = 0;
3378 
3379 	kvm_s390_crypto_init(kvm);
3380 
3381 	if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
3382 		mutex_lock(&kvm->lock);
3383 		kvm_s390_pci_init_list(kvm);
3384 		kvm_s390_vcpu_pci_enable_interp(kvm);
3385 		mutex_unlock(&kvm->lock);
3386 	}
3387 
3388 	mutex_init(&kvm->arch.float_int.ais_lock);
3389 	spin_lock_init(&kvm->arch.float_int.lock);
3390 	for (i = 0; i < FIRQ_LIST_COUNT; i++)
3391 		INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
3392 	init_waitqueue_head(&kvm->arch.ipte_wq);
3393 	mutex_init(&kvm->arch.ipte_mutex);
3394 
3395 	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
3396 	VM_EVENT(kvm, 3, "vm created with type %lu", type);
3397 
3398 	if (type & KVM_VM_S390_UCONTROL) {
3399 		kvm->arch.gmap = NULL;
3400 		kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
3401 	} else {
3402 		if (sclp.hamax == U64_MAX)
3403 			kvm->arch.mem_limit = TASK_SIZE_MAX;
3404 		else
3405 			kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
3406 						    sclp.hamax + 1);
3407 		kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
3408 		if (!kvm->arch.gmap)
3409 			goto out_err;
3410 		kvm->arch.gmap->private = kvm;
3411 		kvm->arch.gmap->pfault_enabled = 0;
3412 	}
3413 
3414 	kvm->arch.use_pfmfi = sclp.has_pfmfi;
3415 	kvm->arch.use_skf = sclp.has_skey;
3416 	spin_lock_init(&kvm->arch.start_stop_lock);
3417 	kvm_s390_vsie_init(kvm);
3418 	if (use_gisa)
3419 		kvm_s390_gisa_init(kvm);
3420 	INIT_LIST_HEAD(&kvm->arch.pv.need_cleanup);
3421 	kvm->arch.pv.set_aside = NULL;
3422 	KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
3423 
3424 	return 0;
3425 out_err:
3426 	free_page((unsigned long)kvm->arch.sie_page2);
3427 	debug_unregister(kvm->arch.dbf);
3428 	sca_dispose(kvm);
3429 	KVM_EVENT(3, "creation of vm failed: %d", rc);
3430 	return rc;
3431 }
3432 
3433 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
3434 {
3435 	u16 rc, rrc;
3436 
3437 	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
3438 	trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
3439 	kvm_s390_clear_local_irqs(vcpu);
3440 	kvm_clear_async_pf_completion_queue(vcpu);
3441 	if (!kvm_is_ucontrol(vcpu->kvm))
3442 		sca_del_vcpu(vcpu);
3443 	kvm_s390_update_topology_change_report(vcpu->kvm, 1);
3444 
3445 	if (kvm_is_ucontrol(vcpu->kvm))
3446 		gmap_remove(vcpu->arch.gmap);
3447 
3448 	if (vcpu->kvm->arch.use_cmma)
3449 		kvm_s390_vcpu_unsetup_cmma(vcpu);
3450 	/* We can not hold the vcpu mutex here, we are already dying */
3451 	if (kvm_s390_pv_cpu_get_handle(vcpu))
3452 		kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc);
3453 	free_page((unsigned long)(vcpu->arch.sie_block));
3454 }
3455 
3456 void kvm_arch_destroy_vm(struct kvm *kvm)
3457 {
3458 	u16 rc, rrc;
3459 
3460 	kvm_destroy_vcpus(kvm);
3461 	sca_dispose(kvm);
3462 	kvm_s390_gisa_destroy(kvm);
3463 	/*
3464 	 * We are already at the end of life and kvm->lock is not taken.
3465 	 * This is ok as the file descriptor is closed by now and nobody
3466 	 * can mess with the pv state.
3467 	 */
3468 	kvm_s390_pv_deinit_cleanup_all(kvm, &rc, &rrc);
3469 	/*
3470 	 * Remove the mmu notifier only when the whole KVM VM is torn down,
3471 	 * and only if one was registered to begin with. If the VM is
3472 	 * currently not protected, but has been previously been protected,
3473 	 * then it's possible that the notifier is still registered.
3474 	 */
3475 	if (kvm->arch.pv.mmu_notifier.ops)
3476 		mmu_notifier_unregister(&kvm->arch.pv.mmu_notifier, kvm->mm);
3477 
3478 	debug_unregister(kvm->arch.dbf);
3479 	free_page((unsigned long)kvm->arch.sie_page2);
3480 	if (!kvm_is_ucontrol(kvm))
3481 		gmap_remove(kvm->arch.gmap);
3482 	kvm_s390_destroy_adapters(kvm);
3483 	kvm_s390_clear_float_irqs(kvm);
3484 	kvm_s390_vsie_destroy(kvm);
3485 	KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
3486 }
3487 
3488 /* Section: vcpu related */
3489 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
3490 {
3491 	vcpu->arch.gmap = gmap_create(current->mm, -1UL);
3492 	if (!vcpu->arch.gmap)
3493 		return -ENOMEM;
3494 	vcpu->arch.gmap->private = vcpu->kvm;
3495 
3496 	return 0;
3497 }
3498 
3499 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
3500 {
3501 	if (!kvm_s390_use_sca_entries())
3502 		return;
3503 	read_lock(&vcpu->kvm->arch.sca_lock);
3504 	if (vcpu->kvm->arch.use_esca) {
3505 		struct esca_block *sca = vcpu->kvm->arch.sca;
3506 
3507 		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
3508 		sca->cpu[vcpu->vcpu_id].sda = 0;
3509 	} else {
3510 		struct bsca_block *sca = vcpu->kvm->arch.sca;
3511 
3512 		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
3513 		sca->cpu[vcpu->vcpu_id].sda = 0;
3514 	}
3515 	read_unlock(&vcpu->kvm->arch.sca_lock);
3516 }
3517 
3518 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
3519 {
3520 	if (!kvm_s390_use_sca_entries()) {
3521 		phys_addr_t sca_phys = virt_to_phys(vcpu->kvm->arch.sca);
3522 
3523 		/* we still need the basic sca for the ipte control */
3524 		vcpu->arch.sie_block->scaoh = sca_phys >> 32;
3525 		vcpu->arch.sie_block->scaol = sca_phys;
3526 		return;
3527 	}
3528 	read_lock(&vcpu->kvm->arch.sca_lock);
3529 	if (vcpu->kvm->arch.use_esca) {
3530 		struct esca_block *sca = vcpu->kvm->arch.sca;
3531 		phys_addr_t sca_phys = virt_to_phys(sca);
3532 
3533 		sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block);
3534 		vcpu->arch.sie_block->scaoh = sca_phys >> 32;
3535 		vcpu->arch.sie_block->scaol = sca_phys & ESCA_SCAOL_MASK;
3536 		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
3537 		set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
3538 	} else {
3539 		struct bsca_block *sca = vcpu->kvm->arch.sca;
3540 		phys_addr_t sca_phys = virt_to_phys(sca);
3541 
3542 		sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block);
3543 		vcpu->arch.sie_block->scaoh = sca_phys >> 32;
3544 		vcpu->arch.sie_block->scaol = sca_phys;
3545 		set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
3546 	}
3547 	read_unlock(&vcpu->kvm->arch.sca_lock);
3548 }
3549 
3550 /* Basic SCA to Extended SCA data copy routines */
3551 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
3552 {
3553 	d->sda = s->sda;
3554 	d->sigp_ctrl.c = s->sigp_ctrl.c;
3555 	d->sigp_ctrl.scn = s->sigp_ctrl.scn;
3556 }
3557 
3558 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
3559 {
3560 	int i;
3561 
3562 	d->ipte_control = s->ipte_control;
3563 	d->mcn[0] = s->mcn;
3564 	for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
3565 		sca_copy_entry(&d->cpu[i], &s->cpu[i]);
3566 }
3567 
3568 static int sca_switch_to_extended(struct kvm *kvm)
3569 {
3570 	struct bsca_block *old_sca = kvm->arch.sca;
3571 	struct esca_block *new_sca;
3572 	struct kvm_vcpu *vcpu;
3573 	unsigned long vcpu_idx;
3574 	u32 scaol, scaoh;
3575 	phys_addr_t new_sca_phys;
3576 
3577 	if (kvm->arch.use_esca)
3578 		return 0;
3579 
3580 	new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL_ACCOUNT | __GFP_ZERO);
3581 	if (!new_sca)
3582 		return -ENOMEM;
3583 
3584 	new_sca_phys = virt_to_phys(new_sca);
3585 	scaoh = new_sca_phys >> 32;
3586 	scaol = new_sca_phys & ESCA_SCAOL_MASK;
3587 
3588 	kvm_s390_vcpu_block_all(kvm);
3589 	write_lock(&kvm->arch.sca_lock);
3590 
3591 	sca_copy_b_to_e(new_sca, old_sca);
3592 
3593 	kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
3594 		vcpu->arch.sie_block->scaoh = scaoh;
3595 		vcpu->arch.sie_block->scaol = scaol;
3596 		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
3597 	}
3598 	kvm->arch.sca = new_sca;
3599 	kvm->arch.use_esca = 1;
3600 
3601 	write_unlock(&kvm->arch.sca_lock);
3602 	kvm_s390_vcpu_unblock_all(kvm);
3603 
3604 	free_page((unsigned long)old_sca);
3605 
3606 	VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
3607 		 old_sca, kvm->arch.sca);
3608 	return 0;
3609 }
3610 
3611 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
3612 {
3613 	int rc;
3614 
3615 	if (!kvm_s390_use_sca_entries()) {
3616 		if (id < KVM_MAX_VCPUS)
3617 			return true;
3618 		return false;
3619 	}
3620 	if (id < KVM_S390_BSCA_CPU_SLOTS)
3621 		return true;
3622 	if (!sclp.has_esca || !sclp.has_64bscao)
3623 		return false;
3624 
3625 	rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
3626 
3627 	return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
3628 }
3629 
3630 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
3631 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3632 {
3633 	WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
3634 	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
3635 	vcpu->arch.cputm_start = get_tod_clock_fast();
3636 	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
3637 }
3638 
3639 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
3640 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3641 {
3642 	WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
3643 	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
3644 	vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
3645 	vcpu->arch.cputm_start = 0;
3646 	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
3647 }
3648 
3649 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
3650 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3651 {
3652 	WARN_ON_ONCE(vcpu->arch.cputm_enabled);
3653 	vcpu->arch.cputm_enabled = true;
3654 	__start_cpu_timer_accounting(vcpu);
3655 }
3656 
3657 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
3658 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3659 {
3660 	WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
3661 	__stop_cpu_timer_accounting(vcpu);
3662 	vcpu->arch.cputm_enabled = false;
3663 }
3664 
3665 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3666 {
3667 	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3668 	__enable_cpu_timer_accounting(vcpu);
3669 	preempt_enable();
3670 }
3671 
3672 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3673 {
3674 	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3675 	__disable_cpu_timer_accounting(vcpu);
3676 	preempt_enable();
3677 }
3678 
3679 /* set the cpu timer - may only be called from the VCPU thread itself */
3680 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
3681 {
3682 	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3683 	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
3684 	if (vcpu->arch.cputm_enabled)
3685 		vcpu->arch.cputm_start = get_tod_clock_fast();
3686 	vcpu->arch.sie_block->cputm = cputm;
3687 	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
3688 	preempt_enable();
3689 }
3690 
3691 /* update and get the cpu timer - can also be called from other VCPU threads */
3692 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
3693 {
3694 	unsigned int seq;
3695 	__u64 value;
3696 
3697 	if (unlikely(!vcpu->arch.cputm_enabled))
3698 		return vcpu->arch.sie_block->cputm;
3699 
3700 	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3701 	do {
3702 		seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
3703 		/*
3704 		 * If the writer would ever execute a read in the critical
3705 		 * section, e.g. in irq context, we have a deadlock.
3706 		 */
3707 		WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
3708 		value = vcpu->arch.sie_block->cputm;
3709 		/* if cputm_start is 0, accounting is being started/stopped */
3710 		if (likely(vcpu->arch.cputm_start))
3711 			value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
3712 	} while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
3713 	preempt_enable();
3714 	return value;
3715 }
3716 
3717 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
3718 {
3719 
3720 	gmap_enable(vcpu->arch.enabled_gmap);
3721 	kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING);
3722 	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
3723 		__start_cpu_timer_accounting(vcpu);
3724 	vcpu->cpu = cpu;
3725 }
3726 
3727 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
3728 {
3729 	vcpu->cpu = -1;
3730 	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
3731 		__stop_cpu_timer_accounting(vcpu);
3732 	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING);
3733 	vcpu->arch.enabled_gmap = gmap_get_enabled();
3734 	gmap_disable(vcpu->arch.enabled_gmap);
3735 
3736 }
3737 
3738 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
3739 {
3740 	mutex_lock(&vcpu->kvm->lock);
3741 	preempt_disable();
3742 	vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
3743 	vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx;
3744 	preempt_enable();
3745 	mutex_unlock(&vcpu->kvm->lock);
3746 	if (!kvm_is_ucontrol(vcpu->kvm)) {
3747 		vcpu->arch.gmap = vcpu->kvm->arch.gmap;
3748 		sca_add_vcpu(vcpu);
3749 	}
3750 	if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
3751 		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
3752 	/* make vcpu_load load the right gmap on the first trigger */
3753 	vcpu->arch.enabled_gmap = vcpu->arch.gmap;
3754 }
3755 
3756 static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr)
3757 {
3758 	if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) &&
3759 	    test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo))
3760 		return true;
3761 	return false;
3762 }
3763 
3764 static bool kvm_has_pckmo_ecc(struct kvm *kvm)
3765 {
3766 	/* At least one ECC subfunction must be present */
3767 	return kvm_has_pckmo_subfunc(kvm, 32) ||
3768 	       kvm_has_pckmo_subfunc(kvm, 33) ||
3769 	       kvm_has_pckmo_subfunc(kvm, 34) ||
3770 	       kvm_has_pckmo_subfunc(kvm, 40) ||
3771 	       kvm_has_pckmo_subfunc(kvm, 41);
3772 
3773 }
3774 
3775 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
3776 {
3777 	/*
3778 	 * If the AP instructions are not being interpreted and the MSAX3
3779 	 * facility is not configured for the guest, there is nothing to set up.
3780 	 */
3781 	if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76))
3782 		return;
3783 
3784 	vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
3785 	vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
3786 	vcpu->arch.sie_block->eca &= ~ECA_APIE;
3787 	vcpu->arch.sie_block->ecd &= ~ECD_ECC;
3788 
3789 	if (vcpu->kvm->arch.crypto.apie)
3790 		vcpu->arch.sie_block->eca |= ECA_APIE;
3791 
3792 	/* Set up protected key support */
3793 	if (vcpu->kvm->arch.crypto.aes_kw) {
3794 		vcpu->arch.sie_block->ecb3 |= ECB3_AES;
3795 		/* ecc is also wrapped with AES key */
3796 		if (kvm_has_pckmo_ecc(vcpu->kvm))
3797 			vcpu->arch.sie_block->ecd |= ECD_ECC;
3798 	}
3799 
3800 	if (vcpu->kvm->arch.crypto.dea_kw)
3801 		vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
3802 }
3803 
3804 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
3805 {
3806 	free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo));
3807 	vcpu->arch.sie_block->cbrlo = 0;
3808 }
3809 
3810 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
3811 {
3812 	void *cbrlo_page = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT);
3813 
3814 	if (!cbrlo_page)
3815 		return -ENOMEM;
3816 
3817 	vcpu->arch.sie_block->cbrlo = virt_to_phys(cbrlo_page);
3818 	return 0;
3819 }
3820 
3821 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
3822 {
3823 	struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
3824 
3825 	vcpu->arch.sie_block->ibc = model->ibc;
3826 	if (test_kvm_facility(vcpu->kvm, 7))
3827 		vcpu->arch.sie_block->fac = virt_to_phys(model->fac_list);
3828 }
3829 
3830 static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
3831 {
3832 	int rc = 0;
3833 	u16 uvrc, uvrrc;
3834 
3835 	atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
3836 						    CPUSTAT_SM |
3837 						    CPUSTAT_STOPPED);
3838 
3839 	if (test_kvm_facility(vcpu->kvm, 78))
3840 		kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2);
3841 	else if (test_kvm_facility(vcpu->kvm, 8))
3842 		kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED);
3843 
3844 	kvm_s390_vcpu_setup_model(vcpu);
3845 
3846 	/* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
3847 	if (MACHINE_HAS_ESOP)
3848 		vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
3849 	if (test_kvm_facility(vcpu->kvm, 9))
3850 		vcpu->arch.sie_block->ecb |= ECB_SRSI;
3851 	if (test_kvm_facility(vcpu->kvm, 11))
3852 		vcpu->arch.sie_block->ecb |= ECB_PTF;
3853 	if (test_kvm_facility(vcpu->kvm, 73))
3854 		vcpu->arch.sie_block->ecb |= ECB_TE;
3855 	if (!kvm_is_ucontrol(vcpu->kvm))
3856 		vcpu->arch.sie_block->ecb |= ECB_SPECI;
3857 
3858 	if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi)
3859 		vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
3860 	if (test_kvm_facility(vcpu->kvm, 130))
3861 		vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
3862 	vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
3863 	if (sclp.has_cei)
3864 		vcpu->arch.sie_block->eca |= ECA_CEI;
3865 	if (sclp.has_ib)
3866 		vcpu->arch.sie_block->eca |= ECA_IB;
3867 	if (sclp.has_siif)
3868 		vcpu->arch.sie_block->eca |= ECA_SII;
3869 	if (sclp.has_sigpif)
3870 		vcpu->arch.sie_block->eca |= ECA_SIGPI;
3871 	if (test_kvm_facility(vcpu->kvm, 129)) {
3872 		vcpu->arch.sie_block->eca |= ECA_VX;
3873 		vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
3874 	}
3875 	if (test_kvm_facility(vcpu->kvm, 139))
3876 		vcpu->arch.sie_block->ecd |= ECD_MEF;
3877 	if (test_kvm_facility(vcpu->kvm, 156))
3878 		vcpu->arch.sie_block->ecd |= ECD_ETOKENF;
3879 	if (vcpu->arch.sie_block->gd) {
3880 		vcpu->arch.sie_block->eca |= ECA_AIV;
3881 		VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u",
3882 			   vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id);
3883 	}
3884 	vcpu->arch.sie_block->sdnxo = virt_to_phys(&vcpu->run->s.regs.sdnx) | SDNXC;
3885 	vcpu->arch.sie_block->riccbd = virt_to_phys(&vcpu->run->s.regs.riccb);
3886 
3887 	if (sclp.has_kss)
3888 		kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS);
3889 	else
3890 		vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
3891 
3892 	if (vcpu->kvm->arch.use_cmma) {
3893 		rc = kvm_s390_vcpu_setup_cmma(vcpu);
3894 		if (rc)
3895 			return rc;
3896 	}
3897 	hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
3898 	vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
3899 
3900 	vcpu->arch.sie_block->hpid = HPID_KVM;
3901 
3902 	kvm_s390_vcpu_crypto_setup(vcpu);
3903 
3904 	kvm_s390_vcpu_pci_setup(vcpu);
3905 
3906 	mutex_lock(&vcpu->kvm->lock);
3907 	if (kvm_s390_pv_is_protected(vcpu->kvm)) {
3908 		rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc);
3909 		if (rc)
3910 			kvm_s390_vcpu_unsetup_cmma(vcpu);
3911 	}
3912 	mutex_unlock(&vcpu->kvm->lock);
3913 
3914 	return rc;
3915 }
3916 
3917 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
3918 {
3919 	if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
3920 		return -EINVAL;
3921 	return 0;
3922 }
3923 
3924 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
3925 {
3926 	struct sie_page *sie_page;
3927 	int rc;
3928 
3929 	BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
3930 	sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT);
3931 	if (!sie_page)
3932 		return -ENOMEM;
3933 
3934 	vcpu->arch.sie_block = &sie_page->sie_block;
3935 	vcpu->arch.sie_block->itdba = virt_to_phys(&sie_page->itdb);
3936 
3937 	/* the real guest size will always be smaller than msl */
3938 	vcpu->arch.sie_block->mso = 0;
3939 	vcpu->arch.sie_block->msl = sclp.hamax;
3940 
3941 	vcpu->arch.sie_block->icpua = vcpu->vcpu_id;
3942 	spin_lock_init(&vcpu->arch.local_int.lock);
3943 	vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(vcpu->kvm);
3944 	seqcount_init(&vcpu->arch.cputm_seqcount);
3945 
3946 	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
3947 	kvm_clear_async_pf_completion_queue(vcpu);
3948 	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
3949 				    KVM_SYNC_GPRS |
3950 				    KVM_SYNC_ACRS |
3951 				    KVM_SYNC_CRS |
3952 				    KVM_SYNC_ARCH0 |
3953 				    KVM_SYNC_PFAULT |
3954 				    KVM_SYNC_DIAG318;
3955 	kvm_s390_set_prefix(vcpu, 0);
3956 	if (test_kvm_facility(vcpu->kvm, 64))
3957 		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
3958 	if (test_kvm_facility(vcpu->kvm, 82))
3959 		vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
3960 	if (test_kvm_facility(vcpu->kvm, 133))
3961 		vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
3962 	if (test_kvm_facility(vcpu->kvm, 156))
3963 		vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN;
3964 	/* fprs can be synchronized via vrs, even if the guest has no vx. With
3965 	 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
3966 	 */
3967 	if (MACHINE_HAS_VX)
3968 		vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
3969 	else
3970 		vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
3971 
3972 	if (kvm_is_ucontrol(vcpu->kvm)) {
3973 		rc = __kvm_ucontrol_vcpu_init(vcpu);
3974 		if (rc)
3975 			goto out_free_sie_block;
3976 	}
3977 
3978 	VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK",
3979 		 vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
3980 	trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
3981 
3982 	rc = kvm_s390_vcpu_setup(vcpu);
3983 	if (rc)
3984 		goto out_ucontrol_uninit;
3985 
3986 	kvm_s390_update_topology_change_report(vcpu->kvm, 1);
3987 	return 0;
3988 
3989 out_ucontrol_uninit:
3990 	if (kvm_is_ucontrol(vcpu->kvm))
3991 		gmap_remove(vcpu->arch.gmap);
3992 out_free_sie_block:
3993 	free_page((unsigned long)(vcpu->arch.sie_block));
3994 	return rc;
3995 }
3996 
3997 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
3998 {
3999 	clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);
4000 	return kvm_s390_vcpu_has_irq(vcpu, 0);
4001 }
4002 
4003 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
4004 {
4005 	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
4006 }
4007 
4008 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
4009 {
4010 	atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
4011 	exit_sie(vcpu);
4012 }
4013 
4014 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
4015 {
4016 	atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
4017 }
4018 
4019 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
4020 {
4021 	atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
4022 	exit_sie(vcpu);
4023 }
4024 
4025 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu)
4026 {
4027 	return atomic_read(&vcpu->arch.sie_block->prog20) &
4028 	       (PROG_BLOCK_SIE | PROG_REQUEST);
4029 }
4030 
4031 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
4032 {
4033 	atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
4034 }
4035 
4036 /*
4037  * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running.
4038  * If the CPU is not running (e.g. waiting as idle) the function will
4039  * return immediately. */
4040 void exit_sie(struct kvm_vcpu *vcpu)
4041 {
4042 	kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
4043 	kvm_s390_vsie_kick(vcpu);
4044 	while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
4045 		cpu_relax();
4046 }
4047 
4048 /* Kick a guest cpu out of SIE to process a request synchronously */
4049 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
4050 {
4051 	__kvm_make_request(req, vcpu);
4052 	kvm_s390_vcpu_request(vcpu);
4053 }
4054 
4055 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
4056 			      unsigned long end)
4057 {
4058 	struct kvm *kvm = gmap->private;
4059 	struct kvm_vcpu *vcpu;
4060 	unsigned long prefix;
4061 	unsigned long i;
4062 
4063 	trace_kvm_s390_gmap_notifier(start, end, gmap_is_shadow(gmap));
4064 
4065 	if (gmap_is_shadow(gmap))
4066 		return;
4067 	if (start >= 1UL << 31)
4068 		/* We are only interested in prefix pages */
4069 		return;
4070 	kvm_for_each_vcpu(i, vcpu, kvm) {
4071 		/* match against both prefix pages */
4072 		prefix = kvm_s390_get_prefix(vcpu);
4073 		if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
4074 			VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
4075 				   start, end);
4076 			kvm_s390_sync_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu);
4077 		}
4078 	}
4079 }
4080 
4081 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
4082 {
4083 	/* do not poll with more than halt_poll_max_steal percent of steal time */
4084 	if (S390_lowcore.avg_steal_timer * 100 / (TICK_USEC << 12) >=
4085 	    READ_ONCE(halt_poll_max_steal)) {
4086 		vcpu->stat.halt_no_poll_steal++;
4087 		return true;
4088 	}
4089 	return false;
4090 }
4091 
4092 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
4093 {
4094 	/* kvm common code refers to this, but never calls it */
4095 	BUG();
4096 	return 0;
4097 }
4098 
4099 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
4100 					   struct kvm_one_reg *reg)
4101 {
4102 	int r = -EINVAL;
4103 
4104 	switch (reg->id) {
4105 	case KVM_REG_S390_TODPR:
4106 		r = put_user(vcpu->arch.sie_block->todpr,
4107 			     (u32 __user *)reg->addr);
4108 		break;
4109 	case KVM_REG_S390_EPOCHDIFF:
4110 		r = put_user(vcpu->arch.sie_block->epoch,
4111 			     (u64 __user *)reg->addr);
4112 		break;
4113 	case KVM_REG_S390_CPU_TIMER:
4114 		r = put_user(kvm_s390_get_cpu_timer(vcpu),
4115 			     (u64 __user *)reg->addr);
4116 		break;
4117 	case KVM_REG_S390_CLOCK_COMP:
4118 		r = put_user(vcpu->arch.sie_block->ckc,
4119 			     (u64 __user *)reg->addr);
4120 		break;
4121 	case KVM_REG_S390_PFTOKEN:
4122 		r = put_user(vcpu->arch.pfault_token,
4123 			     (u64 __user *)reg->addr);
4124 		break;
4125 	case KVM_REG_S390_PFCOMPARE:
4126 		r = put_user(vcpu->arch.pfault_compare,
4127 			     (u64 __user *)reg->addr);
4128 		break;
4129 	case KVM_REG_S390_PFSELECT:
4130 		r = put_user(vcpu->arch.pfault_select,
4131 			     (u64 __user *)reg->addr);
4132 		break;
4133 	case KVM_REG_S390_PP:
4134 		r = put_user(vcpu->arch.sie_block->pp,
4135 			     (u64 __user *)reg->addr);
4136 		break;
4137 	case KVM_REG_S390_GBEA:
4138 		r = put_user(vcpu->arch.sie_block->gbea,
4139 			     (u64 __user *)reg->addr);
4140 		break;
4141 	default:
4142 		break;
4143 	}
4144 
4145 	return r;
4146 }
4147 
4148 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
4149 					   struct kvm_one_reg *reg)
4150 {
4151 	int r = -EINVAL;
4152 	__u64 val;
4153 
4154 	switch (reg->id) {
4155 	case KVM_REG_S390_TODPR:
4156 		r = get_user(vcpu->arch.sie_block->todpr,
4157 			     (u32 __user *)reg->addr);
4158 		break;
4159 	case KVM_REG_S390_EPOCHDIFF:
4160 		r = get_user(vcpu->arch.sie_block->epoch,
4161 			     (u64 __user *)reg->addr);
4162 		break;
4163 	case KVM_REG_S390_CPU_TIMER:
4164 		r = get_user(val, (u64 __user *)reg->addr);
4165 		if (!r)
4166 			kvm_s390_set_cpu_timer(vcpu, val);
4167 		break;
4168 	case KVM_REG_S390_CLOCK_COMP:
4169 		r = get_user(vcpu->arch.sie_block->ckc,
4170 			     (u64 __user *)reg->addr);
4171 		break;
4172 	case KVM_REG_S390_PFTOKEN:
4173 		r = get_user(vcpu->arch.pfault_token,
4174 			     (u64 __user *)reg->addr);
4175 		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
4176 			kvm_clear_async_pf_completion_queue(vcpu);
4177 		break;
4178 	case KVM_REG_S390_PFCOMPARE:
4179 		r = get_user(vcpu->arch.pfault_compare,
4180 			     (u64 __user *)reg->addr);
4181 		break;
4182 	case KVM_REG_S390_PFSELECT:
4183 		r = get_user(vcpu->arch.pfault_select,
4184 			     (u64 __user *)reg->addr);
4185 		break;
4186 	case KVM_REG_S390_PP:
4187 		r = get_user(vcpu->arch.sie_block->pp,
4188 			     (u64 __user *)reg->addr);
4189 		break;
4190 	case KVM_REG_S390_GBEA:
4191 		r = get_user(vcpu->arch.sie_block->gbea,
4192 			     (u64 __user *)reg->addr);
4193 		break;
4194 	default:
4195 		break;
4196 	}
4197 
4198 	return r;
4199 }
4200 
4201 static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu)
4202 {
4203 	vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI;
4204 	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
4205 	memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb));
4206 
4207 	kvm_clear_async_pf_completion_queue(vcpu);
4208 	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
4209 		kvm_s390_vcpu_stop(vcpu);
4210 	kvm_s390_clear_local_irqs(vcpu);
4211 }
4212 
4213 static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
4214 {
4215 	/* Initial reset is a superset of the normal reset */
4216 	kvm_arch_vcpu_ioctl_normal_reset(vcpu);
4217 
4218 	/*
4219 	 * This equals initial cpu reset in pop, but we don't switch to ESA.
4220 	 * We do not only reset the internal data, but also ...
4221 	 */
4222 	vcpu->arch.sie_block->gpsw.mask = 0;
4223 	vcpu->arch.sie_block->gpsw.addr = 0;
4224 	kvm_s390_set_prefix(vcpu, 0);
4225 	kvm_s390_set_cpu_timer(vcpu, 0);
4226 	vcpu->arch.sie_block->ckc = 0;
4227 	memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr));
4228 	vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK;
4229 	vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK;
4230 
4231 	/* ... the data in sync regs */
4232 	memset(vcpu->run->s.regs.crs, 0, sizeof(vcpu->run->s.regs.crs));
4233 	vcpu->run->s.regs.ckc = 0;
4234 	vcpu->run->s.regs.crs[0] = CR0_INITIAL_MASK;
4235 	vcpu->run->s.regs.crs[14] = CR14_INITIAL_MASK;
4236 	vcpu->run->psw_addr = 0;
4237 	vcpu->run->psw_mask = 0;
4238 	vcpu->run->s.regs.todpr = 0;
4239 	vcpu->run->s.regs.cputm = 0;
4240 	vcpu->run->s.regs.ckc = 0;
4241 	vcpu->run->s.regs.pp = 0;
4242 	vcpu->run->s.regs.gbea = 1;
4243 	vcpu->run->s.regs.fpc = 0;
4244 	/*
4245 	 * Do not reset these registers in the protected case, as some of
4246 	 * them are overlaid and they are not accessible in this case
4247 	 * anyway.
4248 	 */
4249 	if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
4250 		vcpu->arch.sie_block->gbea = 1;
4251 		vcpu->arch.sie_block->pp = 0;
4252 		vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
4253 		vcpu->arch.sie_block->todpr = 0;
4254 	}
4255 }
4256 
4257 static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu)
4258 {
4259 	struct kvm_sync_regs *regs = &vcpu->run->s.regs;
4260 
4261 	/* Clear reset is a superset of the initial reset */
4262 	kvm_arch_vcpu_ioctl_initial_reset(vcpu);
4263 
4264 	memset(&regs->gprs, 0, sizeof(regs->gprs));
4265 	memset(&regs->vrs, 0, sizeof(regs->vrs));
4266 	memset(&regs->acrs, 0, sizeof(regs->acrs));
4267 	memset(&regs->gscb, 0, sizeof(regs->gscb));
4268 
4269 	regs->etoken = 0;
4270 	regs->etoken_extension = 0;
4271 }
4272 
4273 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
4274 {
4275 	vcpu_load(vcpu);
4276 	memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
4277 	vcpu_put(vcpu);
4278 	return 0;
4279 }
4280 
4281 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
4282 {
4283 	vcpu_load(vcpu);
4284 	memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
4285 	vcpu_put(vcpu);
4286 	return 0;
4287 }
4288 
4289 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
4290 				  struct kvm_sregs *sregs)
4291 {
4292 	vcpu_load(vcpu);
4293 
4294 	memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
4295 	memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
4296 
4297 	vcpu_put(vcpu);
4298 	return 0;
4299 }
4300 
4301 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
4302 				  struct kvm_sregs *sregs)
4303 {
4304 	vcpu_load(vcpu);
4305 
4306 	memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
4307 	memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
4308 
4309 	vcpu_put(vcpu);
4310 	return 0;
4311 }
4312 
4313 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4314 {
4315 	int ret = 0;
4316 
4317 	vcpu_load(vcpu);
4318 
4319 	if (test_fp_ctl(fpu->fpc)) {
4320 		ret = -EINVAL;
4321 		goto out;
4322 	}
4323 	vcpu->run->s.regs.fpc = fpu->fpc;
4324 	if (MACHINE_HAS_VX)
4325 		convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
4326 				 (freg_t *) fpu->fprs);
4327 	else
4328 		memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
4329 
4330 out:
4331 	vcpu_put(vcpu);
4332 	return ret;
4333 }
4334 
4335 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4336 {
4337 	vcpu_load(vcpu);
4338 
4339 	/* make sure we have the latest values */
4340 	save_fpu_regs();
4341 	if (MACHINE_HAS_VX)
4342 		convert_vx_to_fp((freg_t *) fpu->fprs,
4343 				 (__vector128 *) vcpu->run->s.regs.vrs);
4344 	else
4345 		memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
4346 	fpu->fpc = vcpu->run->s.regs.fpc;
4347 
4348 	vcpu_put(vcpu);
4349 	return 0;
4350 }
4351 
4352 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
4353 {
4354 	int rc = 0;
4355 
4356 	if (!is_vcpu_stopped(vcpu))
4357 		rc = -EBUSY;
4358 	else {
4359 		vcpu->run->psw_mask = psw.mask;
4360 		vcpu->run->psw_addr = psw.addr;
4361 	}
4362 	return rc;
4363 }
4364 
4365 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
4366 				  struct kvm_translation *tr)
4367 {
4368 	return -EINVAL; /* not implemented yet */
4369 }
4370 
4371 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
4372 			      KVM_GUESTDBG_USE_HW_BP | \
4373 			      KVM_GUESTDBG_ENABLE)
4374 
4375 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
4376 					struct kvm_guest_debug *dbg)
4377 {
4378 	int rc = 0;
4379 
4380 	vcpu_load(vcpu);
4381 
4382 	vcpu->guest_debug = 0;
4383 	kvm_s390_clear_bp_data(vcpu);
4384 
4385 	if (dbg->control & ~VALID_GUESTDBG_FLAGS) {
4386 		rc = -EINVAL;
4387 		goto out;
4388 	}
4389 	if (!sclp.has_gpere) {
4390 		rc = -EINVAL;
4391 		goto out;
4392 	}
4393 
4394 	if (dbg->control & KVM_GUESTDBG_ENABLE) {
4395 		vcpu->guest_debug = dbg->control;
4396 		/* enforce guest PER */
4397 		kvm_s390_set_cpuflags(vcpu, CPUSTAT_P);
4398 
4399 		if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
4400 			rc = kvm_s390_import_bp_data(vcpu, dbg);
4401 	} else {
4402 		kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
4403 		vcpu->arch.guestdbg.last_bp = 0;
4404 	}
4405 
4406 	if (rc) {
4407 		vcpu->guest_debug = 0;
4408 		kvm_s390_clear_bp_data(vcpu);
4409 		kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
4410 	}
4411 
4412 out:
4413 	vcpu_put(vcpu);
4414 	return rc;
4415 }
4416 
4417 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
4418 				    struct kvm_mp_state *mp_state)
4419 {
4420 	int ret;
4421 
4422 	vcpu_load(vcpu);
4423 
4424 	/* CHECK_STOP and LOAD are not supported yet */
4425 	ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
4426 				      KVM_MP_STATE_OPERATING;
4427 
4428 	vcpu_put(vcpu);
4429 	return ret;
4430 }
4431 
4432 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
4433 				    struct kvm_mp_state *mp_state)
4434 {
4435 	int rc = 0;
4436 
4437 	vcpu_load(vcpu);
4438 
4439 	/* user space knows about this interface - let it control the state */
4440 	kvm_s390_set_user_cpu_state_ctrl(vcpu->kvm);
4441 
4442 	switch (mp_state->mp_state) {
4443 	case KVM_MP_STATE_STOPPED:
4444 		rc = kvm_s390_vcpu_stop(vcpu);
4445 		break;
4446 	case KVM_MP_STATE_OPERATING:
4447 		rc = kvm_s390_vcpu_start(vcpu);
4448 		break;
4449 	case KVM_MP_STATE_LOAD:
4450 		if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
4451 			rc = -ENXIO;
4452 			break;
4453 		}
4454 		rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD);
4455 		break;
4456 	case KVM_MP_STATE_CHECK_STOP:
4457 		fallthrough;	/* CHECK_STOP and LOAD are not supported yet */
4458 	default:
4459 		rc = -ENXIO;
4460 	}
4461 
4462 	vcpu_put(vcpu);
4463 	return rc;
4464 }
4465 
4466 static bool ibs_enabled(struct kvm_vcpu *vcpu)
4467 {
4468 	return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS);
4469 }
4470 
4471 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
4472 {
4473 retry:
4474 	kvm_s390_vcpu_request_handled(vcpu);
4475 	if (!kvm_request_pending(vcpu))
4476 		return 0;
4477 	/*
4478 	 * If the guest prefix changed, re-arm the ipte notifier for the
4479 	 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
4480 	 * This ensures that the ipte instruction for this request has
4481 	 * already finished. We might race against a second unmapper that
4482 	 * wants to set the blocking bit. Lets just retry the request loop.
4483 	 */
4484 	if (kvm_check_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu)) {
4485 		int rc;
4486 		rc = gmap_mprotect_notify(vcpu->arch.gmap,
4487 					  kvm_s390_get_prefix(vcpu),
4488 					  PAGE_SIZE * 2, PROT_WRITE);
4489 		if (rc) {
4490 			kvm_make_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu);
4491 			return rc;
4492 		}
4493 		goto retry;
4494 	}
4495 
4496 	if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
4497 		vcpu->arch.sie_block->ihcpu = 0xffff;
4498 		goto retry;
4499 	}
4500 
4501 	if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
4502 		if (!ibs_enabled(vcpu)) {
4503 			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
4504 			kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS);
4505 		}
4506 		goto retry;
4507 	}
4508 
4509 	if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
4510 		if (ibs_enabled(vcpu)) {
4511 			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
4512 			kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS);
4513 		}
4514 		goto retry;
4515 	}
4516 
4517 	if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
4518 		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
4519 		goto retry;
4520 	}
4521 
4522 	if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
4523 		/*
4524 		 * Disable CMM virtualization; we will emulate the ESSA
4525 		 * instruction manually, in order to provide additional
4526 		 * functionalities needed for live migration.
4527 		 */
4528 		vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
4529 		goto retry;
4530 	}
4531 
4532 	if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
4533 		/*
4534 		 * Re-enable CMM virtualization if CMMA is available and
4535 		 * CMM has been used.
4536 		 */
4537 		if ((vcpu->kvm->arch.use_cmma) &&
4538 		    (vcpu->kvm->mm->context.uses_cmm))
4539 			vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
4540 		goto retry;
4541 	}
4542 
4543 	/* we left the vsie handler, nothing to do, just clear the request */
4544 	kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu);
4545 
4546 	return 0;
4547 }
4548 
4549 static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod)
4550 {
4551 	struct kvm_vcpu *vcpu;
4552 	union tod_clock clk;
4553 	unsigned long i;
4554 
4555 	preempt_disable();
4556 
4557 	store_tod_clock_ext(&clk);
4558 
4559 	kvm->arch.epoch = gtod->tod - clk.tod;
4560 	kvm->arch.epdx = 0;
4561 	if (test_kvm_facility(kvm, 139)) {
4562 		kvm->arch.epdx = gtod->epoch_idx - clk.ei;
4563 		if (kvm->arch.epoch > gtod->tod)
4564 			kvm->arch.epdx -= 1;
4565 	}
4566 
4567 	kvm_s390_vcpu_block_all(kvm);
4568 	kvm_for_each_vcpu(i, vcpu, kvm) {
4569 		vcpu->arch.sie_block->epoch = kvm->arch.epoch;
4570 		vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
4571 	}
4572 
4573 	kvm_s390_vcpu_unblock_all(kvm);
4574 	preempt_enable();
4575 }
4576 
4577 int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod)
4578 {
4579 	if (!mutex_trylock(&kvm->lock))
4580 		return 0;
4581 	__kvm_s390_set_tod_clock(kvm, gtod);
4582 	mutex_unlock(&kvm->lock);
4583 	return 1;
4584 }
4585 
4586 /**
4587  * kvm_arch_fault_in_page - fault-in guest page if necessary
4588  * @vcpu: The corresponding virtual cpu
4589  * @gpa: Guest physical address
4590  * @writable: Whether the page should be writable or not
4591  *
4592  * Make sure that a guest page has been faulted-in on the host.
4593  *
4594  * Return: Zero on success, negative error code otherwise.
4595  */
4596 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
4597 {
4598 	return gmap_fault(vcpu->arch.gmap, gpa,
4599 			  writable ? FAULT_FLAG_WRITE : 0);
4600 }
4601 
4602 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
4603 				      unsigned long token)
4604 {
4605 	struct kvm_s390_interrupt inti;
4606 	struct kvm_s390_irq irq;
4607 
4608 	if (start_token) {
4609 		irq.u.ext.ext_params2 = token;
4610 		irq.type = KVM_S390_INT_PFAULT_INIT;
4611 		WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
4612 	} else {
4613 		inti.type = KVM_S390_INT_PFAULT_DONE;
4614 		inti.parm64 = token;
4615 		WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
4616 	}
4617 }
4618 
4619 bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
4620 				     struct kvm_async_pf *work)
4621 {
4622 	trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
4623 	__kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
4624 
4625 	return true;
4626 }
4627 
4628 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
4629 				 struct kvm_async_pf *work)
4630 {
4631 	trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
4632 	__kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
4633 }
4634 
4635 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
4636 			       struct kvm_async_pf *work)
4637 {
4638 	/* s390 will always inject the page directly */
4639 }
4640 
4641 bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
4642 {
4643 	/*
4644 	 * s390 will always inject the page directly,
4645 	 * but we still want check_async_completion to cleanup
4646 	 */
4647 	return true;
4648 }
4649 
4650 static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
4651 {
4652 	hva_t hva;
4653 	struct kvm_arch_async_pf arch;
4654 
4655 	if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
4656 		return false;
4657 	if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
4658 	    vcpu->arch.pfault_compare)
4659 		return false;
4660 	if (psw_extint_disabled(vcpu))
4661 		return false;
4662 	if (kvm_s390_vcpu_has_irq(vcpu, 0))
4663 		return false;
4664 	if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
4665 		return false;
4666 	if (!vcpu->arch.gmap->pfault_enabled)
4667 		return false;
4668 
4669 	hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
4670 	hva += current->thread.gmap_addr & ~PAGE_MASK;
4671 	if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
4672 		return false;
4673 
4674 	return kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
4675 }
4676 
4677 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
4678 {
4679 	int rc, cpuflags;
4680 
4681 	/*
4682 	 * On s390 notifications for arriving pages will be delivered directly
4683 	 * to the guest but the house keeping for completed pfaults is
4684 	 * handled outside the worker.
4685 	 */
4686 	kvm_check_async_pf_completion(vcpu);
4687 
4688 	vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
4689 	vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
4690 
4691 	if (need_resched())
4692 		schedule();
4693 
4694 	if (!kvm_is_ucontrol(vcpu->kvm)) {
4695 		rc = kvm_s390_deliver_pending_interrupts(vcpu);
4696 		if (rc || guestdbg_exit_pending(vcpu))
4697 			return rc;
4698 	}
4699 
4700 	rc = kvm_s390_handle_requests(vcpu);
4701 	if (rc)
4702 		return rc;
4703 
4704 	if (guestdbg_enabled(vcpu)) {
4705 		kvm_s390_backup_guest_per_regs(vcpu);
4706 		kvm_s390_patch_guest_per_regs(vcpu);
4707 	}
4708 
4709 	clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);
4710 
4711 	vcpu->arch.sie_block->icptcode = 0;
4712 	cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
4713 	VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
4714 	trace_kvm_s390_sie_enter(vcpu, cpuflags);
4715 
4716 	return 0;
4717 }
4718 
4719 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
4720 {
4721 	struct kvm_s390_pgm_info pgm_info = {
4722 		.code = PGM_ADDRESSING,
4723 	};
4724 	u8 opcode, ilen;
4725 	int rc;
4726 
4727 	VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
4728 	trace_kvm_s390_sie_fault(vcpu);
4729 
4730 	/*
4731 	 * We want to inject an addressing exception, which is defined as a
4732 	 * suppressing or terminating exception. However, since we came here
4733 	 * by a DAT access exception, the PSW still points to the faulting
4734 	 * instruction since DAT exceptions are nullifying. So we've got
4735 	 * to look up the current opcode to get the length of the instruction
4736 	 * to be able to forward the PSW.
4737 	 */
4738 	rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
4739 	ilen = insn_length(opcode);
4740 	if (rc < 0) {
4741 		return rc;
4742 	} else if (rc) {
4743 		/* Instruction-Fetching Exceptions - we can't detect the ilen.
4744 		 * Forward by arbitrary ilc, injection will take care of
4745 		 * nullification if necessary.
4746 		 */
4747 		pgm_info = vcpu->arch.pgm;
4748 		ilen = 4;
4749 	}
4750 	pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
4751 	kvm_s390_forward_psw(vcpu, ilen);
4752 	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
4753 }
4754 
4755 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
4756 {
4757 	struct mcck_volatile_info *mcck_info;
4758 	struct sie_page *sie_page;
4759 
4760 	VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
4761 		   vcpu->arch.sie_block->icptcode);
4762 	trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
4763 
4764 	if (guestdbg_enabled(vcpu))
4765 		kvm_s390_restore_guest_per_regs(vcpu);
4766 
4767 	vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
4768 	vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
4769 
4770 	if (exit_reason == -EINTR) {
4771 		VCPU_EVENT(vcpu, 3, "%s", "machine check");
4772 		sie_page = container_of(vcpu->arch.sie_block,
4773 					struct sie_page, sie_block);
4774 		mcck_info = &sie_page->mcck_info;
4775 		kvm_s390_reinject_machine_check(vcpu, mcck_info);
4776 		return 0;
4777 	}
4778 
4779 	if (vcpu->arch.sie_block->icptcode > 0) {
4780 		int rc = kvm_handle_sie_intercept(vcpu);
4781 
4782 		if (rc != -EOPNOTSUPP)
4783 			return rc;
4784 		vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
4785 		vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
4786 		vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
4787 		vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
4788 		return -EREMOTE;
4789 	} else if (exit_reason != -EFAULT) {
4790 		vcpu->stat.exit_null++;
4791 		return 0;
4792 	} else if (kvm_is_ucontrol(vcpu->kvm)) {
4793 		vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
4794 		vcpu->run->s390_ucontrol.trans_exc_code =
4795 						current->thread.gmap_addr;
4796 		vcpu->run->s390_ucontrol.pgm_code = 0x10;
4797 		return -EREMOTE;
4798 	} else if (current->thread.gmap_pfault) {
4799 		trace_kvm_s390_major_guest_pfault(vcpu);
4800 		current->thread.gmap_pfault = 0;
4801 		if (kvm_arch_setup_async_pf(vcpu))
4802 			return 0;
4803 		vcpu->stat.pfault_sync++;
4804 		return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
4805 	}
4806 	return vcpu_post_run_fault_in_sie(vcpu);
4807 }
4808 
4809 #define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK)
4810 static int __vcpu_run(struct kvm_vcpu *vcpu)
4811 {
4812 	int rc, exit_reason;
4813 	struct sie_page *sie_page = (struct sie_page *)vcpu->arch.sie_block;
4814 
4815 	/*
4816 	 * We try to hold kvm->srcu during most of vcpu_run (except when run-
4817 	 * ning the guest), so that memslots (and other stuff) are protected
4818 	 */
4819 	kvm_vcpu_srcu_read_lock(vcpu);
4820 
4821 	do {
4822 		rc = vcpu_pre_run(vcpu);
4823 		if (rc || guestdbg_exit_pending(vcpu))
4824 			break;
4825 
4826 		kvm_vcpu_srcu_read_unlock(vcpu);
4827 		/*
4828 		 * As PF_VCPU will be used in fault handler, between
4829 		 * guest_enter and guest_exit should be no uaccess.
4830 		 */
4831 		local_irq_disable();
4832 		guest_enter_irqoff();
4833 		__disable_cpu_timer_accounting(vcpu);
4834 		local_irq_enable();
4835 		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4836 			memcpy(sie_page->pv_grregs,
4837 			       vcpu->run->s.regs.gprs,
4838 			       sizeof(sie_page->pv_grregs));
4839 		}
4840 		if (test_cpu_flag(CIF_FPU))
4841 			load_fpu_regs();
4842 		exit_reason = sie64a(vcpu->arch.sie_block,
4843 				     vcpu->run->s.regs.gprs);
4844 		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4845 			memcpy(vcpu->run->s.regs.gprs,
4846 			       sie_page->pv_grregs,
4847 			       sizeof(sie_page->pv_grregs));
4848 			/*
4849 			 * We're not allowed to inject interrupts on intercepts
4850 			 * that leave the guest state in an "in-between" state
4851 			 * where the next SIE entry will do a continuation.
4852 			 * Fence interrupts in our "internal" PSW.
4853 			 */
4854 			if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR ||
4855 			    vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) {
4856 				vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
4857 			}
4858 		}
4859 		local_irq_disable();
4860 		__enable_cpu_timer_accounting(vcpu);
4861 		guest_exit_irqoff();
4862 		local_irq_enable();
4863 		kvm_vcpu_srcu_read_lock(vcpu);
4864 
4865 		rc = vcpu_post_run(vcpu, exit_reason);
4866 	} while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
4867 
4868 	kvm_vcpu_srcu_read_unlock(vcpu);
4869 	return rc;
4870 }
4871 
4872 static void sync_regs_fmt2(struct kvm_vcpu *vcpu)
4873 {
4874 	struct kvm_run *kvm_run = vcpu->run;
4875 	struct runtime_instr_cb *riccb;
4876 	struct gs_cb *gscb;
4877 
4878 	riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
4879 	gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
4880 	vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
4881 	vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
4882 	if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
4883 		vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
4884 		vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
4885 		vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
4886 	}
4887 	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
4888 		vcpu->arch.pfault_token = kvm_run->s.regs.pft;
4889 		vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
4890 		vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
4891 		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
4892 			kvm_clear_async_pf_completion_queue(vcpu);
4893 	}
4894 	if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) {
4895 		vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318;
4896 		vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc;
4897 		VCPU_EVENT(vcpu, 3, "setting cpnc to %d", vcpu->arch.diag318_info.cpnc);
4898 	}
4899 	/*
4900 	 * If userspace sets the riccb (e.g. after migration) to a valid state,
4901 	 * we should enable RI here instead of doing the lazy enablement.
4902 	 */
4903 	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
4904 	    test_kvm_facility(vcpu->kvm, 64) &&
4905 	    riccb->v &&
4906 	    !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
4907 		VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
4908 		vcpu->arch.sie_block->ecb3 |= ECB3_RI;
4909 	}
4910 	/*
4911 	 * If userspace sets the gscb (e.g. after migration) to non-zero,
4912 	 * we should enable GS here instead of doing the lazy enablement.
4913 	 */
4914 	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
4915 	    test_kvm_facility(vcpu->kvm, 133) &&
4916 	    gscb->gssm &&
4917 	    !vcpu->arch.gs_enabled) {
4918 		VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
4919 		vcpu->arch.sie_block->ecb |= ECB_GS;
4920 		vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
4921 		vcpu->arch.gs_enabled = 1;
4922 	}
4923 	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
4924 	    test_kvm_facility(vcpu->kvm, 82)) {
4925 		vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
4926 		vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
4927 	}
4928 	if (MACHINE_HAS_GS) {
4929 		preempt_disable();
4930 		local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
4931 		if (current->thread.gs_cb) {
4932 			vcpu->arch.host_gscb = current->thread.gs_cb;
4933 			save_gs_cb(vcpu->arch.host_gscb);
4934 		}
4935 		if (vcpu->arch.gs_enabled) {
4936 			current->thread.gs_cb = (struct gs_cb *)
4937 						&vcpu->run->s.regs.gscb;
4938 			restore_gs_cb(current->thread.gs_cb);
4939 		}
4940 		preempt_enable();
4941 	}
4942 	/* SIE will load etoken directly from SDNX and therefore kvm_run */
4943 }
4944 
4945 static void sync_regs(struct kvm_vcpu *vcpu)
4946 {
4947 	struct kvm_run *kvm_run = vcpu->run;
4948 
4949 	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
4950 		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
4951 	if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
4952 		memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
4953 		/* some control register changes require a tlb flush */
4954 		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
4955 	}
4956 	if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
4957 		kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
4958 		vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
4959 	}
4960 	save_access_regs(vcpu->arch.host_acrs);
4961 	restore_access_regs(vcpu->run->s.regs.acrs);
4962 	/* save host (userspace) fprs/vrs */
4963 	save_fpu_regs();
4964 	vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
4965 	vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
4966 	if (MACHINE_HAS_VX)
4967 		current->thread.fpu.regs = vcpu->run->s.regs.vrs;
4968 	else
4969 		current->thread.fpu.regs = vcpu->run->s.regs.fprs;
4970 	current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
4971 	if (test_fp_ctl(current->thread.fpu.fpc))
4972 		/* User space provided an invalid FPC, let's clear it */
4973 		current->thread.fpu.fpc = 0;
4974 
4975 	/* Sync fmt2 only data */
4976 	if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) {
4977 		sync_regs_fmt2(vcpu);
4978 	} else {
4979 		/*
4980 		 * In several places we have to modify our internal view to
4981 		 * not do things that are disallowed by the ultravisor. For
4982 		 * example we must not inject interrupts after specific exits
4983 		 * (e.g. 112 prefix page not secure). We do this by turning
4984 		 * off the machine check, external and I/O interrupt bits
4985 		 * of our PSW copy. To avoid getting validity intercepts, we
4986 		 * do only accept the condition code from userspace.
4987 		 */
4988 		vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC;
4989 		vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask &
4990 						   PSW_MASK_CC;
4991 	}
4992 
4993 	kvm_run->kvm_dirty_regs = 0;
4994 }
4995 
4996 static void store_regs_fmt2(struct kvm_vcpu *vcpu)
4997 {
4998 	struct kvm_run *kvm_run = vcpu->run;
4999 
5000 	kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
5001 	kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
5002 	kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
5003 	kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
5004 	kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val;
5005 	if (MACHINE_HAS_GS) {
5006 		preempt_disable();
5007 		local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
5008 		if (vcpu->arch.gs_enabled)
5009 			save_gs_cb(current->thread.gs_cb);
5010 		current->thread.gs_cb = vcpu->arch.host_gscb;
5011 		restore_gs_cb(vcpu->arch.host_gscb);
5012 		if (!vcpu->arch.host_gscb)
5013 			local_ctl_clear_bit(2, CR2_GUARDED_STORAGE_BIT);
5014 		vcpu->arch.host_gscb = NULL;
5015 		preempt_enable();
5016 	}
5017 	/* SIE will save etoken directly into SDNX and therefore kvm_run */
5018 }
5019 
5020 static void store_regs(struct kvm_vcpu *vcpu)
5021 {
5022 	struct kvm_run *kvm_run = vcpu->run;
5023 
5024 	kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
5025 	kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
5026 	kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
5027 	memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
5028 	kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
5029 	kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
5030 	kvm_run->s.regs.pft = vcpu->arch.pfault_token;
5031 	kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
5032 	kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
5033 	save_access_regs(vcpu->run->s.regs.acrs);
5034 	restore_access_regs(vcpu->arch.host_acrs);
5035 	/* Save guest register state */
5036 	save_fpu_regs();
5037 	vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
5038 	/* Restore will be done lazily at return */
5039 	current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
5040 	current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
5041 	if (likely(!kvm_s390_pv_cpu_is_protected(vcpu)))
5042 		store_regs_fmt2(vcpu);
5043 }
5044 
5045 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
5046 {
5047 	struct kvm_run *kvm_run = vcpu->run;
5048 	int rc;
5049 
5050 	/*
5051 	 * Running a VM while dumping always has the potential to
5052 	 * produce inconsistent dump data. But for PV vcpus a SIE
5053 	 * entry while dumping could also lead to a fatal validity
5054 	 * intercept which we absolutely want to avoid.
5055 	 */
5056 	if (vcpu->kvm->arch.pv.dumping)
5057 		return -EINVAL;
5058 
5059 	if (kvm_run->immediate_exit)
5060 		return -EINTR;
5061 
5062 	if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
5063 	    kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
5064 		return -EINVAL;
5065 
5066 	vcpu_load(vcpu);
5067 
5068 	if (guestdbg_exit_pending(vcpu)) {
5069 		kvm_s390_prepare_debug_exit(vcpu);
5070 		rc = 0;
5071 		goto out;
5072 	}
5073 
5074 	kvm_sigset_activate(vcpu);
5075 
5076 	/*
5077 	 * no need to check the return value of vcpu_start as it can only have
5078 	 * an error for protvirt, but protvirt means user cpu state
5079 	 */
5080 	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
5081 		kvm_s390_vcpu_start(vcpu);
5082 	} else if (is_vcpu_stopped(vcpu)) {
5083 		pr_err_ratelimited("can't run stopped vcpu %d\n",
5084 				   vcpu->vcpu_id);
5085 		rc = -EINVAL;
5086 		goto out;
5087 	}
5088 
5089 	sync_regs(vcpu);
5090 	enable_cpu_timer_accounting(vcpu);
5091 
5092 	might_fault();
5093 	rc = __vcpu_run(vcpu);
5094 
5095 	if (signal_pending(current) && !rc) {
5096 		kvm_run->exit_reason = KVM_EXIT_INTR;
5097 		rc = -EINTR;
5098 	}
5099 
5100 	if (guestdbg_exit_pending(vcpu) && !rc)  {
5101 		kvm_s390_prepare_debug_exit(vcpu);
5102 		rc = 0;
5103 	}
5104 
5105 	if (rc == -EREMOTE) {
5106 		/* userspace support is needed, kvm_run has been prepared */
5107 		rc = 0;
5108 	}
5109 
5110 	disable_cpu_timer_accounting(vcpu);
5111 	store_regs(vcpu);
5112 
5113 	kvm_sigset_deactivate(vcpu);
5114 
5115 	vcpu->stat.exit_userspace++;
5116 out:
5117 	vcpu_put(vcpu);
5118 	return rc;
5119 }
5120 
5121 /*
5122  * store status at address
5123  * we use have two special cases:
5124  * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
5125  * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
5126  */
5127 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
5128 {
5129 	unsigned char archmode = 1;
5130 	freg_t fprs[NUM_FPRS];
5131 	unsigned int px;
5132 	u64 clkcomp, cputm;
5133 	int rc;
5134 
5135 	px = kvm_s390_get_prefix(vcpu);
5136 	if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
5137 		if (write_guest_abs(vcpu, 163, &archmode, 1))
5138 			return -EFAULT;
5139 		gpa = 0;
5140 	} else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
5141 		if (write_guest_real(vcpu, 163, &archmode, 1))
5142 			return -EFAULT;
5143 		gpa = px;
5144 	} else
5145 		gpa -= __LC_FPREGS_SAVE_AREA;
5146 
5147 	/* manually convert vector registers if necessary */
5148 	if (MACHINE_HAS_VX) {
5149 		convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
5150 		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
5151 				     fprs, 128);
5152 	} else {
5153 		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
5154 				     vcpu->run->s.regs.fprs, 128);
5155 	}
5156 	rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
5157 			      vcpu->run->s.regs.gprs, 128);
5158 	rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
5159 			      &vcpu->arch.sie_block->gpsw, 16);
5160 	rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
5161 			      &px, 4);
5162 	rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
5163 			      &vcpu->run->s.regs.fpc, 4);
5164 	rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
5165 			      &vcpu->arch.sie_block->todpr, 4);
5166 	cputm = kvm_s390_get_cpu_timer(vcpu);
5167 	rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
5168 			      &cputm, 8);
5169 	clkcomp = vcpu->arch.sie_block->ckc >> 8;
5170 	rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
5171 			      &clkcomp, 8);
5172 	rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
5173 			      &vcpu->run->s.regs.acrs, 64);
5174 	rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
5175 			      &vcpu->arch.sie_block->gcr, 128);
5176 	return rc ? -EFAULT : 0;
5177 }
5178 
5179 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
5180 {
5181 	/*
5182 	 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
5183 	 * switch in the run ioctl. Let's update our copies before we save
5184 	 * it into the save area
5185 	 */
5186 	save_fpu_regs();
5187 	vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
5188 	save_access_regs(vcpu->run->s.regs.acrs);
5189 
5190 	return kvm_s390_store_status_unloaded(vcpu, addr);
5191 }
5192 
5193 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
5194 {
5195 	kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
5196 	kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
5197 }
5198 
5199 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
5200 {
5201 	unsigned long i;
5202 	struct kvm_vcpu *vcpu;
5203 
5204 	kvm_for_each_vcpu(i, vcpu, kvm) {
5205 		__disable_ibs_on_vcpu(vcpu);
5206 	}
5207 }
5208 
5209 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
5210 {
5211 	if (!sclp.has_ibs)
5212 		return;
5213 	kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
5214 	kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
5215 }
5216 
5217 int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
5218 {
5219 	int i, online_vcpus, r = 0, started_vcpus = 0;
5220 
5221 	if (!is_vcpu_stopped(vcpu))
5222 		return 0;
5223 
5224 	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
5225 	/* Only one cpu at a time may enter/leave the STOPPED state. */
5226 	spin_lock(&vcpu->kvm->arch.start_stop_lock);
5227 	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
5228 
5229 	/* Let's tell the UV that we want to change into the operating state */
5230 	if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5231 		r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR);
5232 		if (r) {
5233 			spin_unlock(&vcpu->kvm->arch.start_stop_lock);
5234 			return r;
5235 		}
5236 	}
5237 
5238 	for (i = 0; i < online_vcpus; i++) {
5239 		if (!is_vcpu_stopped(kvm_get_vcpu(vcpu->kvm, i)))
5240 			started_vcpus++;
5241 	}
5242 
5243 	if (started_vcpus == 0) {
5244 		/* we're the only active VCPU -> speed it up */
5245 		__enable_ibs_on_vcpu(vcpu);
5246 	} else if (started_vcpus == 1) {
5247 		/*
5248 		 * As we are starting a second VCPU, we have to disable
5249 		 * the IBS facility on all VCPUs to remove potentially
5250 		 * outstanding ENABLE requests.
5251 		 */
5252 		__disable_ibs_on_all_vcpus(vcpu->kvm);
5253 	}
5254 
5255 	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED);
5256 	/*
5257 	 * The real PSW might have changed due to a RESTART interpreted by the
5258 	 * ultravisor. We block all interrupts and let the next sie exit
5259 	 * refresh our view.
5260 	 */
5261 	if (kvm_s390_pv_cpu_is_protected(vcpu))
5262 		vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
5263 	/*
5264 	 * Another VCPU might have used IBS while we were offline.
5265 	 * Let's play safe and flush the VCPU at startup.
5266 	 */
5267 	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
5268 	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
5269 	return 0;
5270 }
5271 
5272 int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
5273 {
5274 	int i, online_vcpus, r = 0, started_vcpus = 0;
5275 	struct kvm_vcpu *started_vcpu = NULL;
5276 
5277 	if (is_vcpu_stopped(vcpu))
5278 		return 0;
5279 
5280 	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
5281 	/* Only one cpu at a time may enter/leave the STOPPED state. */
5282 	spin_lock(&vcpu->kvm->arch.start_stop_lock);
5283 	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
5284 
5285 	/* Let's tell the UV that we want to change into the stopped state */
5286 	if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5287 		r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP);
5288 		if (r) {
5289 			spin_unlock(&vcpu->kvm->arch.start_stop_lock);
5290 			return r;
5291 		}
5292 	}
5293 
5294 	/*
5295 	 * Set the VCPU to STOPPED and THEN clear the interrupt flag,
5296 	 * now that the SIGP STOP and SIGP STOP AND STORE STATUS orders
5297 	 * have been fully processed. This will ensure that the VCPU
5298 	 * is kept BUSY if another VCPU is inquiring with SIGP SENSE.
5299 	 */
5300 	kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
5301 	kvm_s390_clear_stop_irq(vcpu);
5302 
5303 	__disable_ibs_on_vcpu(vcpu);
5304 
5305 	for (i = 0; i < online_vcpus; i++) {
5306 		struct kvm_vcpu *tmp = kvm_get_vcpu(vcpu->kvm, i);
5307 
5308 		if (!is_vcpu_stopped(tmp)) {
5309 			started_vcpus++;
5310 			started_vcpu = tmp;
5311 		}
5312 	}
5313 
5314 	if (started_vcpus == 1) {
5315 		/*
5316 		 * As we only have one VCPU left, we want to enable the
5317 		 * IBS facility for that VCPU to speed it up.
5318 		 */
5319 		__enable_ibs_on_vcpu(started_vcpu);
5320 	}
5321 
5322 	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
5323 	return 0;
5324 }
5325 
5326 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
5327 				     struct kvm_enable_cap *cap)
5328 {
5329 	int r;
5330 
5331 	if (cap->flags)
5332 		return -EINVAL;
5333 
5334 	switch (cap->cap) {
5335 	case KVM_CAP_S390_CSS_SUPPORT:
5336 		if (!vcpu->kvm->arch.css_support) {
5337 			vcpu->kvm->arch.css_support = 1;
5338 			VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
5339 			trace_kvm_s390_enable_css(vcpu->kvm);
5340 		}
5341 		r = 0;
5342 		break;
5343 	default:
5344 		r = -EINVAL;
5345 		break;
5346 	}
5347 	return r;
5348 }
5349 
5350 static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu,
5351 				  struct kvm_s390_mem_op *mop)
5352 {
5353 	void __user *uaddr = (void __user *)mop->buf;
5354 	void *sida_addr;
5355 	int r = 0;
5356 
5357 	if (mop->flags || !mop->size)
5358 		return -EINVAL;
5359 	if (mop->size + mop->sida_offset < mop->size)
5360 		return -EINVAL;
5361 	if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block))
5362 		return -E2BIG;
5363 	if (!kvm_s390_pv_cpu_is_protected(vcpu))
5364 		return -EINVAL;
5365 
5366 	sida_addr = (char *)sida_addr(vcpu->arch.sie_block) + mop->sida_offset;
5367 
5368 	switch (mop->op) {
5369 	case KVM_S390_MEMOP_SIDA_READ:
5370 		if (copy_to_user(uaddr, sida_addr, mop->size))
5371 			r = -EFAULT;
5372 
5373 		break;
5374 	case KVM_S390_MEMOP_SIDA_WRITE:
5375 		if (copy_from_user(sida_addr, uaddr, mop->size))
5376 			r = -EFAULT;
5377 		break;
5378 	}
5379 	return r;
5380 }
5381 
5382 static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu,
5383 				 struct kvm_s390_mem_op *mop)
5384 {
5385 	void __user *uaddr = (void __user *)mop->buf;
5386 	enum gacc_mode acc_mode;
5387 	void *tmpbuf = NULL;
5388 	int r;
5389 
5390 	r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_INJECT_EXCEPTION |
5391 					KVM_S390_MEMOP_F_CHECK_ONLY |
5392 					KVM_S390_MEMOP_F_SKEY_PROTECTION);
5393 	if (r)
5394 		return r;
5395 	if (mop->ar >= NUM_ACRS)
5396 		return -EINVAL;
5397 	if (kvm_s390_pv_cpu_is_protected(vcpu))
5398 		return -EINVAL;
5399 	if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
5400 		tmpbuf = vmalloc(mop->size);
5401 		if (!tmpbuf)
5402 			return -ENOMEM;
5403 	}
5404 
5405 	acc_mode = mop->op == KVM_S390_MEMOP_LOGICAL_READ ? GACC_FETCH : GACC_STORE;
5406 	if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
5407 		r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
5408 				    acc_mode, mop->key);
5409 		goto out_inject;
5410 	}
5411 	if (acc_mode == GACC_FETCH) {
5412 		r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
5413 					mop->size, mop->key);
5414 		if (r)
5415 			goto out_inject;
5416 		if (copy_to_user(uaddr, tmpbuf, mop->size)) {
5417 			r = -EFAULT;
5418 			goto out_free;
5419 		}
5420 	} else {
5421 		if (copy_from_user(tmpbuf, uaddr, mop->size)) {
5422 			r = -EFAULT;
5423 			goto out_free;
5424 		}
5425 		r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
5426 					 mop->size, mop->key);
5427 	}
5428 
5429 out_inject:
5430 	if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
5431 		kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
5432 
5433 out_free:
5434 	vfree(tmpbuf);
5435 	return r;
5436 }
5437 
5438 static long kvm_s390_vcpu_memsida_op(struct kvm_vcpu *vcpu,
5439 				     struct kvm_s390_mem_op *mop)
5440 {
5441 	int r, srcu_idx;
5442 
5443 	srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5444 
5445 	switch (mop->op) {
5446 	case KVM_S390_MEMOP_LOGICAL_READ:
5447 	case KVM_S390_MEMOP_LOGICAL_WRITE:
5448 		r = kvm_s390_vcpu_mem_op(vcpu, mop);
5449 		break;
5450 	case KVM_S390_MEMOP_SIDA_READ:
5451 	case KVM_S390_MEMOP_SIDA_WRITE:
5452 		/* we are locked against sida going away by the vcpu->mutex */
5453 		r = kvm_s390_vcpu_sida_op(vcpu, mop);
5454 		break;
5455 	default:
5456 		r = -EINVAL;
5457 	}
5458 
5459 	srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
5460 	return r;
5461 }
5462 
5463 long kvm_arch_vcpu_async_ioctl(struct file *filp,
5464 			       unsigned int ioctl, unsigned long arg)
5465 {
5466 	struct kvm_vcpu *vcpu = filp->private_data;
5467 	void __user *argp = (void __user *)arg;
5468 	int rc;
5469 
5470 	switch (ioctl) {
5471 	case KVM_S390_IRQ: {
5472 		struct kvm_s390_irq s390irq;
5473 
5474 		if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
5475 			return -EFAULT;
5476 		rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
5477 		break;
5478 	}
5479 	case KVM_S390_INTERRUPT: {
5480 		struct kvm_s390_interrupt s390int;
5481 		struct kvm_s390_irq s390irq = {};
5482 
5483 		if (copy_from_user(&s390int, argp, sizeof(s390int)))
5484 			return -EFAULT;
5485 		if (s390int_to_s390irq(&s390int, &s390irq))
5486 			return -EINVAL;
5487 		rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
5488 		break;
5489 	}
5490 	default:
5491 		rc = -ENOIOCTLCMD;
5492 		break;
5493 	}
5494 
5495 	/*
5496 	 * To simplify single stepping of userspace-emulated instructions,
5497 	 * KVM_EXIT_S390_SIEIC exit sets KVM_GUESTDBG_EXIT_PENDING (see
5498 	 * should_handle_per_ifetch()). However, if userspace emulation injects
5499 	 * an interrupt, it needs to be cleared, so that KVM_EXIT_DEBUG happens
5500 	 * after (and not before) the interrupt delivery.
5501 	 */
5502 	if (!rc)
5503 		vcpu->guest_debug &= ~KVM_GUESTDBG_EXIT_PENDING;
5504 
5505 	return rc;
5506 }
5507 
5508 static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu,
5509 					struct kvm_pv_cmd *cmd)
5510 {
5511 	struct kvm_s390_pv_dmp dmp;
5512 	void *data;
5513 	int ret;
5514 
5515 	/* Dump initialization is a prerequisite */
5516 	if (!vcpu->kvm->arch.pv.dumping)
5517 		return -EINVAL;
5518 
5519 	if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp)))
5520 		return -EFAULT;
5521 
5522 	/* We only handle this subcmd right now */
5523 	if (dmp.subcmd != KVM_PV_DUMP_CPU)
5524 		return -EINVAL;
5525 
5526 	/* CPU dump length is the same as create cpu storage donation. */
5527 	if (dmp.buff_len != uv_info.guest_cpu_stor_len)
5528 		return -EINVAL;
5529 
5530 	data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL);
5531 	if (!data)
5532 		return -ENOMEM;
5533 
5534 	ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc);
5535 
5536 	VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x",
5537 		   vcpu->vcpu_id, cmd->rc, cmd->rrc);
5538 
5539 	if (ret)
5540 		ret = -EINVAL;
5541 
5542 	/* On success copy over the dump data */
5543 	if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len))
5544 		ret = -EFAULT;
5545 
5546 	kvfree(data);
5547 	return ret;
5548 }
5549 
5550 long kvm_arch_vcpu_ioctl(struct file *filp,
5551 			 unsigned int ioctl, unsigned long arg)
5552 {
5553 	struct kvm_vcpu *vcpu = filp->private_data;
5554 	void __user *argp = (void __user *)arg;
5555 	int idx;
5556 	long r;
5557 	u16 rc, rrc;
5558 
5559 	vcpu_load(vcpu);
5560 
5561 	switch (ioctl) {
5562 	case KVM_S390_STORE_STATUS:
5563 		idx = srcu_read_lock(&vcpu->kvm->srcu);
5564 		r = kvm_s390_store_status_unloaded(vcpu, arg);
5565 		srcu_read_unlock(&vcpu->kvm->srcu, idx);
5566 		break;
5567 	case KVM_S390_SET_INITIAL_PSW: {
5568 		psw_t psw;
5569 
5570 		r = -EFAULT;
5571 		if (copy_from_user(&psw, argp, sizeof(psw)))
5572 			break;
5573 		r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
5574 		break;
5575 	}
5576 	case KVM_S390_CLEAR_RESET:
5577 		r = 0;
5578 		kvm_arch_vcpu_ioctl_clear_reset(vcpu);
5579 		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5580 			r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
5581 					  UVC_CMD_CPU_RESET_CLEAR, &rc, &rrc);
5582 			VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: rc %x rrc %x",
5583 				   rc, rrc);
5584 		}
5585 		break;
5586 	case KVM_S390_INITIAL_RESET:
5587 		r = 0;
5588 		kvm_arch_vcpu_ioctl_initial_reset(vcpu);
5589 		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5590 			r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
5591 					  UVC_CMD_CPU_RESET_INITIAL,
5592 					  &rc, &rrc);
5593 			VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: rc %x rrc %x",
5594 				   rc, rrc);
5595 		}
5596 		break;
5597 	case KVM_S390_NORMAL_RESET:
5598 		r = 0;
5599 		kvm_arch_vcpu_ioctl_normal_reset(vcpu);
5600 		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5601 			r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
5602 					  UVC_CMD_CPU_RESET, &rc, &rrc);
5603 			VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: rc %x rrc %x",
5604 				   rc, rrc);
5605 		}
5606 		break;
5607 	case KVM_SET_ONE_REG:
5608 	case KVM_GET_ONE_REG: {
5609 		struct kvm_one_reg reg;
5610 		r = -EINVAL;
5611 		if (kvm_s390_pv_cpu_is_protected(vcpu))
5612 			break;
5613 		r = -EFAULT;
5614 		if (copy_from_user(&reg, argp, sizeof(reg)))
5615 			break;
5616 		if (ioctl == KVM_SET_ONE_REG)
5617 			r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
5618 		else
5619 			r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
5620 		break;
5621 	}
5622 #ifdef CONFIG_KVM_S390_UCONTROL
5623 	case KVM_S390_UCAS_MAP: {
5624 		struct kvm_s390_ucas_mapping ucasmap;
5625 
5626 		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
5627 			r = -EFAULT;
5628 			break;
5629 		}
5630 
5631 		if (!kvm_is_ucontrol(vcpu->kvm)) {
5632 			r = -EINVAL;
5633 			break;
5634 		}
5635 
5636 		r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
5637 				     ucasmap.vcpu_addr, ucasmap.length);
5638 		break;
5639 	}
5640 	case KVM_S390_UCAS_UNMAP: {
5641 		struct kvm_s390_ucas_mapping ucasmap;
5642 
5643 		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
5644 			r = -EFAULT;
5645 			break;
5646 		}
5647 
5648 		if (!kvm_is_ucontrol(vcpu->kvm)) {
5649 			r = -EINVAL;
5650 			break;
5651 		}
5652 
5653 		r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
5654 			ucasmap.length);
5655 		break;
5656 	}
5657 #endif
5658 	case KVM_S390_VCPU_FAULT: {
5659 		r = gmap_fault(vcpu->arch.gmap, arg, 0);
5660 		break;
5661 	}
5662 	case KVM_ENABLE_CAP:
5663 	{
5664 		struct kvm_enable_cap cap;
5665 		r = -EFAULT;
5666 		if (copy_from_user(&cap, argp, sizeof(cap)))
5667 			break;
5668 		r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
5669 		break;
5670 	}
5671 	case KVM_S390_MEM_OP: {
5672 		struct kvm_s390_mem_op mem_op;
5673 
5674 		if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
5675 			r = kvm_s390_vcpu_memsida_op(vcpu, &mem_op);
5676 		else
5677 			r = -EFAULT;
5678 		break;
5679 	}
5680 	case KVM_S390_SET_IRQ_STATE: {
5681 		struct kvm_s390_irq_state irq_state;
5682 
5683 		r = -EFAULT;
5684 		if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
5685 			break;
5686 		if (irq_state.len > VCPU_IRQS_MAX_BUF ||
5687 		    irq_state.len == 0 ||
5688 		    irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
5689 			r = -EINVAL;
5690 			break;
5691 		}
5692 		/* do not use irq_state.flags, it will break old QEMUs */
5693 		r = kvm_s390_set_irq_state(vcpu,
5694 					   (void __user *) irq_state.buf,
5695 					   irq_state.len);
5696 		break;
5697 	}
5698 	case KVM_S390_GET_IRQ_STATE: {
5699 		struct kvm_s390_irq_state irq_state;
5700 
5701 		r = -EFAULT;
5702 		if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
5703 			break;
5704 		if (irq_state.len == 0) {
5705 			r = -EINVAL;
5706 			break;
5707 		}
5708 		/* do not use irq_state.flags, it will break old QEMUs */
5709 		r = kvm_s390_get_irq_state(vcpu,
5710 					   (__u8 __user *)  irq_state.buf,
5711 					   irq_state.len);
5712 		break;
5713 	}
5714 	case KVM_S390_PV_CPU_COMMAND: {
5715 		struct kvm_pv_cmd cmd;
5716 
5717 		r = -EINVAL;
5718 		if (!is_prot_virt_host())
5719 			break;
5720 
5721 		r = -EFAULT;
5722 		if (copy_from_user(&cmd, argp, sizeof(cmd)))
5723 			break;
5724 
5725 		r = -EINVAL;
5726 		if (cmd.flags)
5727 			break;
5728 
5729 		/* We only handle this cmd right now */
5730 		if (cmd.cmd != KVM_PV_DUMP)
5731 			break;
5732 
5733 		r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd);
5734 
5735 		/* Always copy over UV rc / rrc data */
5736 		if (copy_to_user((__u8 __user *)argp, &cmd.rc,
5737 				 sizeof(cmd.rc) + sizeof(cmd.rrc)))
5738 			r = -EFAULT;
5739 		break;
5740 	}
5741 	default:
5742 		r = -ENOTTY;
5743 	}
5744 
5745 	vcpu_put(vcpu);
5746 	return r;
5747 }
5748 
5749 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
5750 {
5751 #ifdef CONFIG_KVM_S390_UCONTROL
5752 	if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
5753 		 && (kvm_is_ucontrol(vcpu->kvm))) {
5754 		vmf->page = virt_to_page(vcpu->arch.sie_block);
5755 		get_page(vmf->page);
5756 		return 0;
5757 	}
5758 #endif
5759 	return VM_FAULT_SIGBUS;
5760 }
5761 
5762 bool kvm_arch_irqchip_in_kernel(struct kvm *kvm)
5763 {
5764 	return true;
5765 }
5766 
5767 /* Section: memory related */
5768 int kvm_arch_prepare_memory_region(struct kvm *kvm,
5769 				   const struct kvm_memory_slot *old,
5770 				   struct kvm_memory_slot *new,
5771 				   enum kvm_mr_change change)
5772 {
5773 	gpa_t size;
5774 
5775 	/* When we are protected, we should not change the memory slots */
5776 	if (kvm_s390_pv_get_handle(kvm))
5777 		return -EINVAL;
5778 
5779 	if (change != KVM_MR_DELETE && change != KVM_MR_FLAGS_ONLY) {
5780 		/*
5781 		 * A few sanity checks. We can have memory slots which have to be
5782 		 * located/ended at a segment boundary (1MB). The memory in userland is
5783 		 * ok to be fragmented into various different vmas. It is okay to mmap()
5784 		 * and munmap() stuff in this slot after doing this call at any time
5785 		 */
5786 
5787 		if (new->userspace_addr & 0xffffful)
5788 			return -EINVAL;
5789 
5790 		size = new->npages * PAGE_SIZE;
5791 		if (size & 0xffffful)
5792 			return -EINVAL;
5793 
5794 		if ((new->base_gfn * PAGE_SIZE) + size > kvm->arch.mem_limit)
5795 			return -EINVAL;
5796 	}
5797 
5798 	if (!kvm->arch.migration_mode)
5799 		return 0;
5800 
5801 	/*
5802 	 * Turn off migration mode when:
5803 	 * - userspace creates a new memslot with dirty logging off,
5804 	 * - userspace modifies an existing memslot (MOVE or FLAGS_ONLY) and
5805 	 *   dirty logging is turned off.
5806 	 * Migration mode expects dirty page logging being enabled to store
5807 	 * its dirty bitmap.
5808 	 */
5809 	if (change != KVM_MR_DELETE &&
5810 	    !(new->flags & KVM_MEM_LOG_DIRTY_PAGES))
5811 		WARN(kvm_s390_vm_stop_migration(kvm),
5812 		     "Failed to stop migration mode");
5813 
5814 	return 0;
5815 }
5816 
5817 void kvm_arch_commit_memory_region(struct kvm *kvm,
5818 				struct kvm_memory_slot *old,
5819 				const struct kvm_memory_slot *new,
5820 				enum kvm_mr_change change)
5821 {
5822 	int rc = 0;
5823 
5824 	switch (change) {
5825 	case KVM_MR_DELETE:
5826 		rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
5827 					old->npages * PAGE_SIZE);
5828 		break;
5829 	case KVM_MR_MOVE:
5830 		rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
5831 					old->npages * PAGE_SIZE);
5832 		if (rc)
5833 			break;
5834 		fallthrough;
5835 	case KVM_MR_CREATE:
5836 		rc = gmap_map_segment(kvm->arch.gmap, new->userspace_addr,
5837 				      new->base_gfn * PAGE_SIZE,
5838 				      new->npages * PAGE_SIZE);
5839 		break;
5840 	case KVM_MR_FLAGS_ONLY:
5841 		break;
5842 	default:
5843 		WARN(1, "Unknown KVM MR CHANGE: %d\n", change);
5844 	}
5845 	if (rc)
5846 		pr_warn("failed to commit memory region\n");
5847 	return;
5848 }
5849 
5850 static inline unsigned long nonhyp_mask(int i)
5851 {
5852 	unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
5853 
5854 	return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
5855 }
5856 
5857 static int __init kvm_s390_init(void)
5858 {
5859 	int i, r;
5860 
5861 	if (!sclp.has_sief2) {
5862 		pr_info("SIE is not available\n");
5863 		return -ENODEV;
5864 	}
5865 
5866 	if (nested && hpage) {
5867 		pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n");
5868 		return -EINVAL;
5869 	}
5870 
5871 	for (i = 0; i < 16; i++)
5872 		kvm_s390_fac_base[i] |=
5873 			stfle_fac_list[i] & nonhyp_mask(i);
5874 
5875 	r = __kvm_s390_init();
5876 	if (r)
5877 		return r;
5878 
5879 	r = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE);
5880 	if (r) {
5881 		__kvm_s390_exit();
5882 		return r;
5883 	}
5884 	return 0;
5885 }
5886 
5887 static void __exit kvm_s390_exit(void)
5888 {
5889 	kvm_exit();
5890 
5891 	__kvm_s390_exit();
5892 }
5893 
5894 module_init(kvm_s390_init);
5895 module_exit(kvm_s390_exit);
5896 
5897 /*
5898  * Enable autoloading of the kvm module.
5899  * Note that we add the module alias here instead of virt/kvm/kvm_main.c
5900  * since x86 takes a different approach.
5901  */
5902 #include <linux/miscdevice.h>
5903 MODULE_ALIAS_MISCDEV(KVM_MINOR);
5904 MODULE_ALIAS("devname:kvm");
5905