1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * handling privileged instructions
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 */
10
11 #include <linux/kvm.h>
12 #include <linux/gfp.h>
13 #include <linux/errno.h>
14 #include <linux/mm_types.h>
15 #include <linux/pgtable.h>
16 #include <linux/io.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/facility.h>
19 #include <asm/current.h>
20 #include <asm/debug.h>
21 #include <asm/ebcdic.h>
22 #include <asm/sysinfo.h>
23 #include <asm/page-states.h>
24 #include <asm/ptrace.h>
25 #include <asm/sclp.h>
26 #include <asm/ap.h>
27 #include <asm/gmap_helpers.h>
28 #include "gaccess.h"
29 #include "kvm-s390.h"
30 #include "trace.h"
31 #include "gmap.h"
32
handle_ri(struct kvm_vcpu * vcpu)33 static int handle_ri(struct kvm_vcpu *vcpu)
34 {
35 vcpu->stat.instruction_ri++;
36
37 if (test_kvm_facility(vcpu->kvm, 64)) {
38 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
39 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
40 kvm_s390_retry_instr(vcpu);
41 return 0;
42 } else
43 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
44 }
45
kvm_s390_handle_aa(struct kvm_vcpu * vcpu)46 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
47 {
48 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
49 return handle_ri(vcpu);
50 else
51 return -EOPNOTSUPP;
52 }
53
handle_gs(struct kvm_vcpu * vcpu)54 static int handle_gs(struct kvm_vcpu *vcpu)
55 {
56 vcpu->stat.instruction_gs++;
57
58 if (test_kvm_facility(vcpu->kvm, 133)) {
59 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
60 preempt_disable();
61 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
62 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
63 restore_gs_cb(current->thread.gs_cb);
64 preempt_enable();
65 vcpu->arch.sie_block->ecb |= ECB_GS;
66 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
67 vcpu->arch.gs_enabled = 1;
68 kvm_s390_retry_instr(vcpu);
69 return 0;
70 } else
71 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
72 }
73
kvm_s390_handle_e3(struct kvm_vcpu * vcpu)74 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
75 {
76 int code = vcpu->arch.sie_block->ipb & 0xff;
77
78 if (code == 0x49 || code == 0x4d)
79 return handle_gs(vcpu);
80 else
81 return -EOPNOTSUPP;
82 }
83 /* Handle SCK (SET CLOCK) interception */
handle_set_clock(struct kvm_vcpu * vcpu)84 static int handle_set_clock(struct kvm_vcpu *vcpu)
85 {
86 struct kvm_s390_vm_tod_clock gtod = { 0 };
87 int rc;
88 u8 ar;
89 u64 op2;
90
91 vcpu->stat.instruction_sck++;
92
93 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
94 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
95
96 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
97 if (op2 & 7) /* Operand must be on a doubleword boundary */
98 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
99 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod));
100 if (rc)
101 return kvm_s390_inject_prog_cond(vcpu, rc);
102
103 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
104 /*
105 * To set the TOD clock the kvm lock must be taken, but the vcpu lock
106 * is already held in handle_set_clock. The usual lock order is the
107 * opposite. As SCK is deprecated and should not be used in several
108 * cases, for example when the multiple epoch facility or TOD clock
109 * steering facility is installed (see Principles of Operation), a
110 * slow path can be used. If the lock can not be taken via try_lock,
111 * the instruction will be retried via -EAGAIN at a later point in
112 * time.
113 */
114 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) {
115 kvm_s390_retry_instr(vcpu);
116 return -EAGAIN;
117 }
118
119 kvm_s390_set_psw_cc(vcpu, 0);
120 return 0;
121 }
122
handle_set_prefix(struct kvm_vcpu * vcpu)123 static int handle_set_prefix(struct kvm_vcpu *vcpu)
124 {
125 u64 operand2;
126 u32 address;
127 int rc;
128 u8 ar;
129
130 vcpu->stat.instruction_spx++;
131
132 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
133 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
134
135 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
136
137 /* must be word boundary */
138 if (operand2 & 3)
139 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
140
141 /* get the value */
142 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
143 if (rc)
144 return kvm_s390_inject_prog_cond(vcpu, rc);
145
146 address &= 0x7fffe000u;
147
148 /*
149 * Make sure the new value is valid memory. We only need to check the
150 * first page, since address is 8k aligned and memory pieces are always
151 * at least 1MB aligned and have at least a size of 1MB.
152 */
153 if (!kvm_is_gpa_in_memslot(vcpu->kvm, address))
154 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
155
156 kvm_s390_set_prefix(vcpu, address);
157 trace_kvm_s390_handle_prefix(vcpu, 1, address);
158 return 0;
159 }
160
handle_store_prefix(struct kvm_vcpu * vcpu)161 static int handle_store_prefix(struct kvm_vcpu *vcpu)
162 {
163 u64 operand2;
164 u32 address;
165 int rc;
166 u8 ar;
167
168 vcpu->stat.instruction_stpx++;
169
170 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
171 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
172
173 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
174
175 /* must be word boundary */
176 if (operand2 & 3)
177 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
178
179 address = kvm_s390_get_prefix(vcpu);
180
181 /* get the value */
182 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
183 if (rc)
184 return kvm_s390_inject_prog_cond(vcpu, rc);
185
186 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
187 trace_kvm_s390_handle_prefix(vcpu, 0, address);
188 return 0;
189 }
190
handle_store_cpu_address(struct kvm_vcpu * vcpu)191 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
192 {
193 u16 vcpu_id = vcpu->vcpu_id;
194 u64 ga;
195 int rc;
196 u8 ar;
197
198 vcpu->stat.instruction_stap++;
199
200 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
201 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
202
203 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
204
205 if (ga & 1)
206 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
207
208 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
209 if (rc)
210 return kvm_s390_inject_prog_cond(vcpu, rc);
211
212 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
213 trace_kvm_s390_handle_stap(vcpu, ga);
214 return 0;
215 }
216
kvm_s390_skey_check_enable(struct kvm_vcpu * vcpu)217 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
218 {
219 int rc;
220
221 trace_kvm_s390_skey_related_inst(vcpu);
222 /* Already enabled? */
223 if (vcpu->arch.skey_enabled)
224 return 0;
225
226 rc = gmap_enable_skeys(vcpu->arch.gmap);
227 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
228 if (rc)
229 return rc;
230
231 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
232 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
233 if (!vcpu->kvm->arch.use_skf)
234 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
235 else
236 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
237 vcpu->arch.skey_enabled = true;
238 return 0;
239 }
240
try_handle_skey(struct kvm_vcpu * vcpu)241 static int try_handle_skey(struct kvm_vcpu *vcpu)
242 {
243 int rc;
244
245 rc = kvm_s390_skey_check_enable(vcpu);
246 if (rc)
247 return rc;
248 if (vcpu->kvm->arch.use_skf) {
249 /* with storage-key facility, SIE interprets it for us */
250 kvm_s390_retry_instr(vcpu);
251 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
252 return -EAGAIN;
253 }
254 return 0;
255 }
256
handle_iske(struct kvm_vcpu * vcpu)257 static int handle_iske(struct kvm_vcpu *vcpu)
258 {
259 unsigned long gaddr;
260 int reg1, reg2;
261 union skey key;
262 int rc;
263
264 vcpu->stat.instruction_iske++;
265
266 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
267 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
268
269 rc = try_handle_skey(vcpu);
270 if (rc)
271 return rc != -EAGAIN ? rc : 0;
272
273 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
274
275 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
276 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
277 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
278 scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
279 rc = dat_get_storage_key(vcpu->arch.gmap->asce, gpa_to_gfn(gaddr), &key);
280 if (rc > 0)
281 return kvm_s390_inject_program_int(vcpu, rc);
282 if (rc < 0)
283 return rc;
284 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
285 vcpu->run->s.regs.gprs[reg1] |= key.skey;
286 return 0;
287 }
288
handle_rrbe(struct kvm_vcpu * vcpu)289 static int handle_rrbe(struct kvm_vcpu *vcpu)
290 {
291 unsigned long gaddr;
292 int reg1, reg2;
293 int rc;
294
295 vcpu->stat.instruction_rrbe++;
296
297 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
298 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
299
300 rc = try_handle_skey(vcpu);
301 if (rc)
302 return rc != -EAGAIN ? rc : 0;
303
304 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
305
306 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
307 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
308 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
309 scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
310 rc = dat_reset_reference_bit(vcpu->arch.gmap->asce, gpa_to_gfn(gaddr));
311 if (rc > 0)
312 return kvm_s390_inject_program_int(vcpu, rc);
313 if (rc < 0)
314 return rc;
315 kvm_s390_set_psw_cc(vcpu, rc);
316 return 0;
317 }
318
319 #define SSKE_NQ 0x8
320 #define SSKE_MR 0x4
321 #define SSKE_MC 0x2
322 #define SSKE_MB 0x1
handle_sske(struct kvm_vcpu * vcpu)323 static int handle_sske(struct kvm_vcpu *vcpu)
324 {
325 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
326 unsigned long start, end;
327 union skey key, oldkey;
328 int reg1, reg2;
329 int rc;
330
331 vcpu->stat.instruction_sske++;
332
333 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
334 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
335
336 rc = try_handle_skey(vcpu);
337 if (rc)
338 return rc != -EAGAIN ? rc : 0;
339
340 if (!test_kvm_facility(vcpu->kvm, 8))
341 m3 &= ~SSKE_MB;
342 if (!test_kvm_facility(vcpu->kvm, 10))
343 m3 &= ~(SSKE_MC | SSKE_MR);
344 if (!test_kvm_facility(vcpu->kvm, 14))
345 m3 &= ~SSKE_NQ;
346
347 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
348
349 key.skey = vcpu->run->s.regs.gprs[reg1] & 0xfe;
350 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
351 start = kvm_s390_logical_to_effective(vcpu, start);
352 if (m3 & SSKE_MB) {
353 /* start already designates an absolute address */
354 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
355 } else {
356 start = kvm_s390_real_to_abs(vcpu, start);
357 end = start + PAGE_SIZE;
358 }
359
360 while (start != end) {
361 scoped_guard(read_lock, &vcpu->kvm->mmu_lock) {
362 rc = dat_cond_set_storage_key(vcpu->arch.mc, vcpu->arch.gmap->asce,
363 gpa_to_gfn(start), key, &oldkey,
364 m3 & SSKE_NQ, m3 & SSKE_MR, m3 & SSKE_MC);
365 }
366 if (rc > 1)
367 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
368 if (rc == -ENOMEM) {
369 kvm_s390_mmu_cache_topup(vcpu->arch.mc);
370 continue;
371 }
372 if (rc < 0)
373 return rc;
374 start += PAGE_SIZE;
375 }
376
377 if (m3 & (SSKE_MC | SSKE_MR)) {
378 if (m3 & SSKE_MB) {
379 /* skey in reg1 is unpredictable */
380 kvm_s390_set_psw_cc(vcpu, 3);
381 } else {
382 kvm_s390_set_psw_cc(vcpu, rc);
383 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
384 vcpu->run->s.regs.gprs[reg1] |= (u64)oldkey.skey << 8;
385 }
386 }
387 if (m3 & SSKE_MB) {
388 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
389 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
390 else
391 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
392 end = kvm_s390_logical_to_effective(vcpu, end);
393 vcpu->run->s.regs.gprs[reg2] |= end;
394 }
395 return 0;
396 }
397
handle_ipte_interlock(struct kvm_vcpu * vcpu)398 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
399 {
400 vcpu->stat.instruction_ipte_interlock++;
401 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
402 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
403 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm));
404 kvm_s390_retry_instr(vcpu);
405 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
406 return 0;
407 }
408
handle_test_block(struct kvm_vcpu * vcpu)409 static int handle_test_block(struct kvm_vcpu *vcpu)
410 {
411 gpa_t addr;
412 int reg2;
413
414 vcpu->stat.instruction_tb++;
415
416 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
417 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
418
419 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
420 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
421 addr = kvm_s390_logical_to_effective(vcpu, addr);
422 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
423 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
424 addr = kvm_s390_real_to_abs(vcpu, addr);
425
426 if (!kvm_is_gpa_in_memslot(vcpu->kvm, addr))
427 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
428 /*
429 * We don't expect errors on modern systems, and do not care
430 * about storage keys (yet), so let's just clear the page.
431 */
432 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
433 return -EFAULT;
434 kvm_s390_set_psw_cc(vcpu, 0);
435 vcpu->run->s.regs.gprs[0] = 0;
436 return 0;
437 }
438
handle_tpi(struct kvm_vcpu * vcpu)439 static int handle_tpi(struct kvm_vcpu *vcpu)
440 {
441 struct kvm_s390_interrupt_info *inti;
442 unsigned long len;
443 u32 tpi_data[3];
444 int rc;
445 u64 addr;
446 u8 ar;
447
448 vcpu->stat.instruction_tpi++;
449
450 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
451 if (addr & 3)
452 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
453
454 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
455 if (!inti) {
456 kvm_s390_set_psw_cc(vcpu, 0);
457 return 0;
458 }
459
460 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
461 tpi_data[1] = inti->io.io_int_parm;
462 tpi_data[2] = inti->io.io_int_word;
463 if (addr) {
464 /*
465 * Store the two-word I/O interruption code into the
466 * provided area.
467 */
468 len = sizeof(tpi_data) - 4;
469 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
470 if (rc) {
471 rc = kvm_s390_inject_prog_cond(vcpu, rc);
472 goto reinject_interrupt;
473 }
474 } else {
475 /*
476 * Store the three-word I/O interruption code into
477 * the appropriate lowcore area.
478 */
479 len = sizeof(tpi_data);
480 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
481 /* failed writes to the low core are not recoverable */
482 rc = -EFAULT;
483 goto reinject_interrupt;
484 }
485 }
486
487 /* irq was successfully handed to the guest */
488 kfree(inti);
489 kvm_s390_set_psw_cc(vcpu, 1);
490 return 0;
491 reinject_interrupt:
492 /*
493 * If we encounter a problem storing the interruption code, the
494 * instruction is suppressed from the guest's view: reinject the
495 * interrupt.
496 */
497 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
498 kfree(inti);
499 rc = -EFAULT;
500 }
501 /* don't set the cc, a pgm irq was injected or we drop to user space */
502 return rc ? -EFAULT : 0;
503 }
504
handle_tsch(struct kvm_vcpu * vcpu)505 static int handle_tsch(struct kvm_vcpu *vcpu)
506 {
507 struct kvm_s390_interrupt_info *inti = NULL;
508 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
509
510 vcpu->stat.instruction_tsch++;
511
512 /* a valid schid has at least one bit set */
513 if (vcpu->run->s.regs.gprs[1])
514 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
515 vcpu->run->s.regs.gprs[1]);
516
517 /*
518 * Prepare exit to userspace.
519 * We indicate whether we dequeued a pending I/O interrupt
520 * so that userspace can re-inject it if the instruction gets
521 * a program check. While this may re-order the pending I/O
522 * interrupts, this is no problem since the priority is kept
523 * intact.
524 */
525 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
526 vcpu->run->s390_tsch.dequeued = !!inti;
527 if (inti) {
528 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
529 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
530 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
531 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
532 }
533 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
534 kfree(inti);
535 return -EREMOTE;
536 }
537
handle_io_inst(struct kvm_vcpu * vcpu)538 static int handle_io_inst(struct kvm_vcpu *vcpu)
539 {
540 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
541
542 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
543 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
544
545 if (vcpu->kvm->arch.css_support) {
546 /*
547 * Most I/O instructions will be handled by userspace.
548 * Exceptions are tpi and the interrupt portion of tsch.
549 */
550 if (vcpu->arch.sie_block->ipa == 0xb236)
551 return handle_tpi(vcpu);
552 if (vcpu->arch.sie_block->ipa == 0xb235)
553 return handle_tsch(vcpu);
554 /* Handle in userspace. */
555 vcpu->stat.instruction_io_other++;
556 return -EOPNOTSUPP;
557 } else {
558 /*
559 * Set condition code 3 to stop the guest from issuing channel
560 * I/O instructions.
561 */
562 kvm_s390_set_psw_cc(vcpu, 3);
563 return 0;
564 }
565 }
566
567 #if IS_ENABLED(CONFIG_VFIO_AP)
kvm_s390_is_gpa_in_memslot(struct kvm * kvm,gpa_t gpa)568 bool kvm_s390_is_gpa_in_memslot(struct kvm *kvm, gpa_t gpa)
569 {
570 return kvm_is_gpa_in_memslot(kvm, gpa);
571 }
572 EXPORT_SYMBOL_FOR_MODULES(kvm_s390_is_gpa_in_memslot, "vfio_ap");
573 #endif
574
575 /*
576 * handle_pqap: Handling pqap interception
577 * @vcpu: the vcpu having issue the pqap instruction
578 *
579 * We now support PQAP/AQIC instructions and we need to correctly
580 * answer the guest even if no dedicated driver's hook is available.
581 *
582 * The intercepting code calls a dedicated callback for this instruction
583 * if a driver did register one in the CRYPTO satellite of the
584 * SIE block.
585 *
586 * If no callback is available, the queues are not available, return this
587 * response code to the caller and set CC to 3.
588 * Else return the response code returned by the callback.
589 */
handle_pqap(struct kvm_vcpu * vcpu)590 static int handle_pqap(struct kvm_vcpu *vcpu)
591 {
592 struct ap_queue_status status = {};
593 crypto_hook pqap_hook;
594 unsigned long reg0;
595 int ret;
596 uint8_t fc;
597
598 /* Verify that the AP instruction are available */
599 if (!ap_instructions_available())
600 return -EOPNOTSUPP;
601 /* Verify that the guest is allowed to use AP instructions */
602 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
603 return -EOPNOTSUPP;
604 /*
605 * The only possibly intercepted functions when AP instructions are
606 * available for the guest are AQIC and TAPQ with the t bit set
607 * since we do not set IC.3 (FIII) we currently will only intercept
608 * the AQIC function code.
609 * Note: running nested under z/VM can result in intercepts for other
610 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
611 */
612 reg0 = vcpu->run->s.regs.gprs[0];
613 fc = (reg0 >> 24) & 0xff;
614 if (fc != 0x03)
615 return -EOPNOTSUPP;
616
617 /* PQAP instruction is allowed for guest kernel only */
618 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
619 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
620
621 /* Common PQAP instruction specification exceptions */
622 /* bits 41-47 must all be zeros */
623 if (reg0 & 0x007f0000UL)
624 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
625 /* APFT not install and T bit set */
626 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
627 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
628 /* APXA not installed and APID greater 64 or APQI greater 16 */
629 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
630 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
631
632 /* AQIC function code specific exception */
633 /* facility 65 not present for AQIC function code */
634 if (!test_kvm_facility(vcpu->kvm, 65))
635 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
636
637 /*
638 * If the hook callback is registered, there will be a pointer to the
639 * hook function pointer in the kvm_s390_crypto structure. Lock the
640 * owner, retrieve the hook function pointer and call the hook.
641 */
642 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
643 if (vcpu->kvm->arch.crypto.pqap_hook) {
644 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
645 ret = pqap_hook(vcpu);
646 if (!ret) {
647 if (vcpu->run->s.regs.gprs[1] & 0x00ff0000)
648 kvm_s390_set_psw_cc(vcpu, 3);
649 else
650 kvm_s390_set_psw_cc(vcpu, 0);
651 }
652 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
653 return ret;
654 }
655 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
656 /*
657 * A vfio_driver must register a hook.
658 * No hook means no driver to enable the SIE CRYCB and no queues.
659 * We send this response to the guest.
660 */
661 status.response_code = 0x01;
662 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
663 kvm_s390_set_psw_cc(vcpu, 3);
664 return 0;
665 }
666
handle_stfl(struct kvm_vcpu * vcpu)667 static int handle_stfl(struct kvm_vcpu *vcpu)
668 {
669 int rc;
670 unsigned int fac;
671
672 vcpu->stat.instruction_stfl++;
673
674 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
675 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
676
677 /*
678 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
679 * into a u32 memory representation. They will remain bits 0-31.
680 */
681 fac = *vcpu->kvm->arch.model.fac_list >> 32;
682 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
683 &fac, sizeof(fac));
684 if (rc)
685 return rc;
686 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
687 trace_kvm_s390_handle_stfl(vcpu, fac);
688 return 0;
689 }
690
691 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
692 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
693 #define PSW_ADDR_24 0x0000000000ffffffUL
694 #define PSW_ADDR_31 0x000000007fffffffUL
695
is_valid_psw(psw_t * psw)696 int is_valid_psw(psw_t *psw)
697 {
698 if (psw->mask & PSW_MASK_UNASSIGNED)
699 return 0;
700 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
701 if (psw->addr & ~PSW_ADDR_31)
702 return 0;
703 }
704 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
705 return 0;
706 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
707 return 0;
708 if (psw->addr & 1)
709 return 0;
710 return 1;
711 }
712
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)713 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
714 {
715 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
716 psw32_t new_psw;
717 u64 addr, iaddr;
718 int rc;
719 u8 ar;
720
721 vcpu->stat.instruction_lpsw++;
722
723 iaddr = gpsw->addr - kvm_s390_get_ilen(vcpu);
724 if (gpsw->mask & PSW_MASK_PSTATE)
725 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
726
727 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
728 if (addr & 7)
729 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
730
731 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
732 if (rc)
733 return kvm_s390_inject_prog_cond(vcpu, rc);
734 if (!(new_psw.mask & PSW32_MASK_BASE))
735 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
736 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
737 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
738 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
739 if (!is_valid_psw(gpsw))
740 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
741 vcpu->arch.sie_block->gbea = iaddr;
742 return 0;
743 }
744
handle_lpswe(struct kvm_vcpu * vcpu)745 static int handle_lpswe(struct kvm_vcpu *vcpu)
746 {
747 psw_t new_psw;
748 u64 addr, iaddr;
749 int rc;
750 u8 ar;
751
752 vcpu->stat.instruction_lpswe++;
753
754 iaddr = vcpu->arch.sie_block->gpsw.addr - kvm_s390_get_ilen(vcpu);
755 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
756 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
757
758 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
759 if (addr & 7)
760 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
761 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
762 if (rc)
763 return kvm_s390_inject_prog_cond(vcpu, rc);
764 vcpu->arch.sie_block->gpsw = new_psw;
765 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
766 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
767 vcpu->arch.sie_block->gbea = iaddr;
768 return 0;
769 }
770
handle_lpswey(struct kvm_vcpu * vcpu)771 static int handle_lpswey(struct kvm_vcpu *vcpu)
772 {
773 psw_t new_psw;
774 u64 addr;
775 int rc;
776 u8 ar;
777
778 vcpu->stat.instruction_lpswey++;
779
780 if (!test_kvm_facility(vcpu->kvm, 193))
781 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
782
783 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
784 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
785
786 addr = kvm_s390_get_base_disp_siy(vcpu, &ar);
787 if (addr & 7)
788 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
789
790 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
791 if (rc)
792 return kvm_s390_inject_prog_cond(vcpu, rc);
793
794 vcpu->arch.sie_block->gpsw = new_psw;
795 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
796 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
797
798 return 0;
799 }
800
handle_stidp(struct kvm_vcpu * vcpu)801 static int handle_stidp(struct kvm_vcpu *vcpu)
802 {
803 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
804 u64 operand2;
805 int rc;
806 u8 ar;
807
808 vcpu->stat.instruction_stidp++;
809
810 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
811 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
812
813 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
814
815 if (operand2 & 7)
816 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
817
818 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
819 if (rc)
820 return kvm_s390_inject_prog_cond(vcpu, rc);
821
822 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
823 return 0;
824 }
825
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)826 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
827 {
828 int cpus = 0;
829 int n;
830
831 cpus = atomic_read(&vcpu->kvm->online_vcpus);
832
833 /* deal with other level 3 hypervisors */
834 if (stsi(mem, 3, 2, 2))
835 mem->count = 0;
836 if (mem->count < 8)
837 mem->count++;
838 for (n = mem->count - 1; n > 0 ; n--)
839 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
840
841 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
842 mem->vm[0].cpus_total = cpus;
843 mem->vm[0].cpus_configured = cpus;
844 mem->vm[0].cpus_standby = 0;
845 mem->vm[0].cpus_reserved = 0;
846 mem->vm[0].caf = 1000;
847 memcpy(mem->vm[0].name, "KVMguest", 8);
848 ASCEBC(mem->vm[0].name, 8);
849 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
850 ASCEBC(mem->vm[0].cpi, 16);
851 }
852
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,u8 ar,u8 fc,u8 sel1,u16 sel2)853 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
854 u8 fc, u8 sel1, u16 sel2)
855 {
856 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
857 vcpu->run->s390_stsi.addr = addr;
858 vcpu->run->s390_stsi.ar = ar;
859 vcpu->run->s390_stsi.fc = fc;
860 vcpu->run->s390_stsi.sel1 = sel1;
861 vcpu->run->s390_stsi.sel2 = sel2;
862 }
863
handle_stsi(struct kvm_vcpu * vcpu)864 static int handle_stsi(struct kvm_vcpu *vcpu)
865 {
866 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
867 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
868 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
869 unsigned long mem = 0;
870 u64 operand2;
871 int rc = 0;
872 u8 ar;
873
874 vcpu->stat.instruction_stsi++;
875 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
876
877 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
878 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
879
880 /* Bailout forbidden function codes */
881 if (fc > 3 && fc != 15)
882 goto out_no_data;
883
884 /*
885 * fc 15 is provided only with
886 * - PTF/CPU topology support through facility 15
887 * - KVM_CAP_S390_USER_STSI
888 */
889 if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
890 !vcpu->kvm->arch.user_stsi))
891 goto out_no_data;
892
893 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
894 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
895 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
896
897 if (fc == 0) {
898 vcpu->run->s.regs.gprs[0] = 3 << 28;
899 kvm_s390_set_psw_cc(vcpu, 0);
900 return 0;
901 }
902
903 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
904
905 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
906 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
907
908 switch (fc) {
909 case 1: /* same handling for 1 and 2 */
910 case 2:
911 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
912 if (!mem)
913 goto out_no_data;
914 if (stsi((void *) mem, fc, sel1, sel2))
915 goto out_no_data;
916 break;
917 case 3:
918 if (sel1 != 2 || sel2 != 2)
919 goto out_no_data;
920 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
921 if (!mem)
922 goto out_no_data;
923 handle_stsi_3_2_2(vcpu, (void *) mem);
924 break;
925 case 15: /* fc 15 is fully handled in userspace */
926 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
927 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
928 return -EREMOTE;
929 }
930 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
931 memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE);
932 rc = 0;
933 } else {
934 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
935 }
936 if (rc) {
937 rc = kvm_s390_inject_prog_cond(vcpu, rc);
938 goto out;
939 }
940 if (vcpu->kvm->arch.user_stsi) {
941 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
942 rc = -EREMOTE;
943 }
944 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
945 free_page(mem);
946 kvm_s390_set_psw_cc(vcpu, 0);
947 vcpu->run->s.regs.gprs[0] = 0;
948 return rc;
949 out_no_data:
950 kvm_s390_set_psw_cc(vcpu, 3);
951 out:
952 free_page(mem);
953 return rc;
954 }
955
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)956 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
957 {
958 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
959 case 0x02:
960 return handle_stidp(vcpu);
961 case 0x04:
962 return handle_set_clock(vcpu);
963 case 0x10:
964 return handle_set_prefix(vcpu);
965 case 0x11:
966 return handle_store_prefix(vcpu);
967 case 0x12:
968 return handle_store_cpu_address(vcpu);
969 case 0x14:
970 return kvm_s390_handle_vsie(vcpu);
971 case 0x21:
972 case 0x50:
973 return handle_ipte_interlock(vcpu);
974 case 0x29:
975 return handle_iske(vcpu);
976 case 0x2a:
977 return handle_rrbe(vcpu);
978 case 0x2b:
979 return handle_sske(vcpu);
980 case 0x2c:
981 return handle_test_block(vcpu);
982 case 0x30:
983 case 0x31:
984 case 0x32:
985 case 0x33:
986 case 0x34:
987 case 0x35:
988 case 0x36:
989 case 0x37:
990 case 0x38:
991 case 0x39:
992 case 0x3a:
993 case 0x3b:
994 case 0x3c:
995 case 0x5f:
996 case 0x74:
997 case 0x76:
998 return handle_io_inst(vcpu);
999 case 0x56:
1000 return handle_sthyi(vcpu);
1001 case 0x7d:
1002 return handle_stsi(vcpu);
1003 case 0xaf:
1004 return handle_pqap(vcpu);
1005 case 0xb1:
1006 return handle_stfl(vcpu);
1007 case 0xb2:
1008 return handle_lpswe(vcpu);
1009 default:
1010 return -EOPNOTSUPP;
1011 }
1012 }
1013
handle_epsw(struct kvm_vcpu * vcpu)1014 static int handle_epsw(struct kvm_vcpu *vcpu)
1015 {
1016 int reg1, reg2;
1017
1018 vcpu->stat.instruction_epsw++;
1019
1020 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1021
1022 /* This basically extracts the mask half of the psw. */
1023 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1024 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1025 if (reg2) {
1026 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1027 vcpu->run->s.regs.gprs[reg2] |=
1028 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1029 }
1030 return 0;
1031 }
1032
1033 #define PFMF_RESERVED 0xfffc0101UL
1034 #define PFMF_SK 0x00020000UL
1035 #define PFMF_CF 0x00010000UL
1036 #define PFMF_UI 0x00008000UL
1037 #define PFMF_FSC 0x00007000UL
1038 #define PFMF_NQ 0x00000800UL
1039 #define PFMF_MR 0x00000400UL
1040 #define PFMF_MC 0x00000200UL
1041 #define PFMF_KEY 0x000000feUL
1042
handle_pfmf(struct kvm_vcpu * vcpu)1043 static int handle_pfmf(struct kvm_vcpu *vcpu)
1044 {
1045 bool mr = false, mc = false, nq;
1046 int reg1, reg2;
1047 unsigned long start, end;
1048 union skey key;
1049
1050 vcpu->stat.instruction_pfmf++;
1051
1052 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1053
1054 if (!test_kvm_facility(vcpu->kvm, 8))
1055 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1056
1057 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1058 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1059
1060 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1061 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1062
1063 /* Only provide non-quiescing support if enabled for the guest */
1064 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1065 !test_kvm_facility(vcpu->kvm, 14))
1066 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1067
1068 /* Only provide conditional-SSKE support if enabled for the guest */
1069 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1070 test_kvm_facility(vcpu->kvm, 10)) {
1071 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1072 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1073 }
1074
1075 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1076 key.skey = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1077 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1078 start = kvm_s390_logical_to_effective(vcpu, start);
1079
1080 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1081 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1082 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1083 }
1084
1085 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1086 case 0x00000000:
1087 /* only 4k frames specify a real address */
1088 start = kvm_s390_real_to_abs(vcpu, start);
1089 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1090 break;
1091 case 0x00001000:
1092 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1093 break;
1094 case 0x00002000:
1095 /* only support 2G frame size if EDAT2 is available and we are
1096 not in 24-bit addressing mode */
1097 if (!test_kvm_facility(vcpu->kvm, 78) ||
1098 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1099 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1100 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1101 break;
1102 default:
1103 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1104 }
1105
1106 while (start != end) {
1107 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1108 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1109 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1110 }
1111
1112 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1113 int rc = kvm_s390_skey_check_enable(vcpu);
1114
1115 if (rc)
1116 return rc;
1117 scoped_guard(read_lock, &vcpu->kvm->mmu_lock) {
1118 rc = dat_cond_set_storage_key(vcpu->arch.mc, vcpu->arch.gmap->asce,
1119 gpa_to_gfn(start), key,
1120 NULL, nq, mr, mc);
1121 }
1122 if (rc > 1)
1123 return kvm_s390_inject_program_int(vcpu, rc);
1124 if (rc == -ENOMEM) {
1125 kvm_s390_mmu_cache_topup(vcpu->arch.mc);
1126 continue;
1127 }
1128 if (rc < 0)
1129 return rc;
1130 }
1131 start += PAGE_SIZE;
1132 }
1133 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1134 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1135 vcpu->run->s.regs.gprs[reg2] = end;
1136 } else {
1137 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1138 end = kvm_s390_logical_to_effective(vcpu, end);
1139 vcpu->run->s.regs.gprs[reg2] |= end;
1140 }
1141 }
1142 return 0;
1143 }
1144
1145 /*
1146 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1147 */
__do_essa(struct kvm_vcpu * vcpu,const int orc)1148 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1149 {
1150 int r1, r2, nappended, entries;
1151 union essa_state state;
1152 unsigned long *cbrlo;
1153 unsigned long gfn;
1154 bool dirtied;
1155
1156 /*
1157 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1158 * machine check here we either handle it or crash
1159 */
1160
1161 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1162 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1163 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1164
1165 nappended = dat_perform_essa(vcpu->arch.gmap->asce, gfn, orc, &state, &dirtied);
1166 vcpu->run->s.regs.gprs[r1] = state.val;
1167 if (nappended < 0)
1168 return 0;
1169 /*
1170 * It is possible that all the normal 511 slots were full, in which case
1171 * we will now write in the 512th slot, which is reserved for host use.
1172 * In both cases we let the normal essa handling code process all the
1173 * slots, including the reserved one, if needed.
1174 */
1175 if (nappended > 0) {
1176 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1177 cbrlo[entries] = gfn << PAGE_SHIFT;
1178 }
1179
1180 if (dirtied)
1181 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1182
1183 return nappended;
1184 }
1185
_essa_clear_cbrl(struct kvm_vcpu * vcpu,unsigned long * cbrl,int len)1186 static void _essa_clear_cbrl(struct kvm_vcpu *vcpu, unsigned long *cbrl, int len)
1187 {
1188 union crste *crstep;
1189 union pgste pgste;
1190 union pte *ptep;
1191 hva_t hva;
1192 int i;
1193
1194 lockdep_assert_held(&vcpu->kvm->mmu_lock);
1195
1196 for (i = 0; i < len; i++) {
1197 if (dat_entry_walk(NULL, gpa_to_gfn(cbrl[i]), vcpu->arch.gmap->asce,
1198 0, TABLE_TYPE_PAGE_TABLE, &crstep, &ptep))
1199 continue;
1200 if (!ptep || ptep->s.pr)
1201 continue;
1202 pgste = pgste_get_lock(ptep);
1203 if (pgste.usage == PGSTE_GPS_USAGE_UNUSED || pgste.zero) {
1204 hva = gpa_to_hva(vcpu->kvm, cbrl[i]);
1205 if (!kvm_is_error_hva(hva))
1206 gmap_helper_zap_one_page(vcpu->kvm->mm, hva);
1207 }
1208 pgste_set_unlock(ptep, pgste);
1209 }
1210 }
1211
handle_essa(struct kvm_vcpu * vcpu)1212 static int handle_essa(struct kvm_vcpu *vcpu)
1213 {
1214 lockdep_assert_held(&vcpu->kvm->srcu);
1215
1216 /* entries expected to be 1FF */
1217 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1218 unsigned long *cbrlo;
1219 int i, orc;
1220
1221 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1222 vcpu->stat.instruction_essa++;
1223 if (!vcpu->kvm->arch.use_cmma)
1224 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1225
1226 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1227 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1228 /* Check for invalid operation request code */
1229 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1230 /* ORCs 0-6 are always valid */
1231 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1232 : ESSA_SET_STABLE_IF_RESIDENT))
1233 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1234
1235 if (!vcpu->kvm->arch.migration_mode) {
1236 /*
1237 * CMMA is enabled in the KVM settings, but is disabled in
1238 * the SIE block and in the mm_context, and we are not doing
1239 * a migration. Enable CMMA in the mm_context.
1240 * Since we need to take a write lock to write to the context
1241 * to avoid races with storage keys handling, we check if the
1242 * value really needs to be written to; if the value is
1243 * already correct, we do nothing and avoid the lock.
1244 */
1245 set_bit(GMAP_FLAG_USES_CMM, &vcpu->arch.gmap->flags);
1246 /*
1247 * If we are here, we are supposed to have CMMA enabled in
1248 * the SIE block. Enabling CMMA works on a per-CPU basis,
1249 * while the context use_cmma flag is per process.
1250 * It's possible that the context flag is enabled and the
1251 * SIE flag is not, so we set the flag always; if it was
1252 * already set, nothing changes, otherwise we enable it
1253 * on this CPU too.
1254 */
1255 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1256 /* Retry the ESSA instruction */
1257 kvm_s390_retry_instr(vcpu);
1258 } else {
1259 scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
1260 i = __do_essa(vcpu, orc);
1261 if (i < 0)
1262 return i;
1263 /* Account for the possible extra cbrl entry */
1264 entries += i;
1265 }
1266 /* reset nceo */
1267 vcpu->arch.sie_block->cbrlo &= PAGE_MASK;
1268 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1269
1270 mmap_read_lock(vcpu->kvm->mm);
1271 scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
1272 _essa_clear_cbrl(vcpu, cbrlo, entries);
1273 mmap_read_unlock(vcpu->kvm->mm);
1274
1275 return 0;
1276 }
1277
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)1278 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1279 {
1280 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1281 case 0x8a:
1282 case 0x8e:
1283 case 0x8f:
1284 return handle_ipte_interlock(vcpu);
1285 case 0x8d:
1286 return handle_epsw(vcpu);
1287 case 0xab:
1288 return handle_essa(vcpu);
1289 case 0xaf:
1290 return handle_pfmf(vcpu);
1291 default:
1292 return -EOPNOTSUPP;
1293 }
1294 }
1295
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)1296 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1297 {
1298 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1299 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1300 int reg, rc, nr_regs;
1301 u32 ctl_array[16];
1302 u64 ga;
1303 u8 ar;
1304
1305 vcpu->stat.instruction_lctl++;
1306
1307 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1308 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1309
1310 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1311
1312 if (ga & 3)
1313 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1314
1315 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1316 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1317
1318 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1319 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1320 if (rc)
1321 return kvm_s390_inject_prog_cond(vcpu, rc);
1322 reg = reg1;
1323 nr_regs = 0;
1324 do {
1325 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1326 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1327 if (reg == reg3)
1328 break;
1329 reg = (reg + 1) % 16;
1330 } while (1);
1331 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1332 return 0;
1333 }
1334
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)1335 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1336 {
1337 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1338 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1339 int reg, rc, nr_regs;
1340 u32 ctl_array[16];
1341 u64 ga;
1342 u8 ar;
1343
1344 vcpu->stat.instruction_stctl++;
1345
1346 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1347 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1348
1349 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1350
1351 if (ga & 3)
1352 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1353
1354 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1355 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1356
1357 reg = reg1;
1358 nr_regs = 0;
1359 do {
1360 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1361 if (reg == reg3)
1362 break;
1363 reg = (reg + 1) % 16;
1364 } while (1);
1365 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1366 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1367 }
1368
handle_lctlg(struct kvm_vcpu * vcpu)1369 static int handle_lctlg(struct kvm_vcpu *vcpu)
1370 {
1371 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1372 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1373 int reg, rc, nr_regs;
1374 u64 ctl_array[16];
1375 u64 ga;
1376 u8 ar;
1377
1378 vcpu->stat.instruction_lctlg++;
1379
1380 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1381 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1382
1383 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1384
1385 if (ga & 7)
1386 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1387
1388 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1389 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1390
1391 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1392 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1393 if (rc)
1394 return kvm_s390_inject_prog_cond(vcpu, rc);
1395 reg = reg1;
1396 nr_regs = 0;
1397 do {
1398 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1399 if (reg == reg3)
1400 break;
1401 reg = (reg + 1) % 16;
1402 } while (1);
1403 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1404 return 0;
1405 }
1406
handle_stctg(struct kvm_vcpu * vcpu)1407 static int handle_stctg(struct kvm_vcpu *vcpu)
1408 {
1409 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1410 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1411 int reg, rc, nr_regs;
1412 u64 ctl_array[16];
1413 u64 ga;
1414 u8 ar;
1415
1416 vcpu->stat.instruction_stctg++;
1417
1418 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1419 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1420
1421 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1422
1423 if (ga & 7)
1424 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1425
1426 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1427 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1428
1429 reg = reg1;
1430 nr_regs = 0;
1431 do {
1432 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1433 if (reg == reg3)
1434 break;
1435 reg = (reg + 1) % 16;
1436 } while (1);
1437 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1438 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1439 }
1440
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)1441 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1442 {
1443 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1444 case 0x25:
1445 return handle_stctg(vcpu);
1446 case 0x2f:
1447 return handle_lctlg(vcpu);
1448 case 0x60:
1449 case 0x61:
1450 case 0x62:
1451 return handle_ri(vcpu);
1452 case 0x71:
1453 return handle_lpswey(vcpu);
1454 default:
1455 return -EOPNOTSUPP;
1456 }
1457 }
1458
handle_tprot(struct kvm_vcpu * vcpu)1459 static int handle_tprot(struct kvm_vcpu *vcpu)
1460 {
1461 u64 address, operand2;
1462 unsigned long gpa;
1463 u8 access_key;
1464 bool writable;
1465 int ret, cc;
1466 u8 ar;
1467
1468 vcpu->stat.instruction_tprot++;
1469
1470 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1471 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1472
1473 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1474 access_key = (operand2 & 0xf0) >> 4;
1475
1476 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1477 ipte_lock(vcpu->kvm);
1478
1479 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1480 GACC_STORE, access_key);
1481 if (ret == 0) {
1482 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1483 } else if (ret == PGM_PROTECTION) {
1484 writable = false;
1485 /* Write protected? Try again with read-only... */
1486 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1487 GACC_FETCH, access_key);
1488 }
1489 if (ret >= 0) {
1490 cc = -1;
1491
1492 /* Fetching permitted; storing permitted */
1493 if (ret == 0 && writable)
1494 cc = 0;
1495 /* Fetching permitted; storing not permitted */
1496 else if (ret == 0 && !writable)
1497 cc = 1;
1498 /* Fetching not permitted; storing not permitted */
1499 else if (ret == PGM_PROTECTION)
1500 cc = 2;
1501 /* Translation not available */
1502 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1503 cc = 3;
1504
1505 if (cc != -1) {
1506 kvm_s390_set_psw_cc(vcpu, cc);
1507 ret = 0;
1508 } else {
1509 ret = kvm_s390_inject_program_int(vcpu, ret);
1510 }
1511 }
1512
1513 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1514 ipte_unlock(vcpu->kvm);
1515 return ret;
1516 }
1517
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1518 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1519 {
1520 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1521 case 0x01:
1522 return handle_tprot(vcpu);
1523 default:
1524 return -EOPNOTSUPP;
1525 }
1526 }
1527
handle_sckpf(struct kvm_vcpu * vcpu)1528 static int handle_sckpf(struct kvm_vcpu *vcpu)
1529 {
1530 u32 value;
1531
1532 vcpu->stat.instruction_sckpf++;
1533
1534 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1535 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1536
1537 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1538 return kvm_s390_inject_program_int(vcpu,
1539 PGM_SPECIFICATION);
1540
1541 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1542 vcpu->arch.sie_block->todpr = value;
1543
1544 return 0;
1545 }
1546
handle_ptff(struct kvm_vcpu * vcpu)1547 static int handle_ptff(struct kvm_vcpu *vcpu)
1548 {
1549 vcpu->stat.instruction_ptff++;
1550
1551 /* we don't emulate any control instructions yet */
1552 kvm_s390_set_psw_cc(vcpu, 3);
1553 return 0;
1554 }
1555
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1556 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1557 {
1558 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1559 case 0x04:
1560 return handle_ptff(vcpu);
1561 case 0x07:
1562 return handle_sckpf(vcpu);
1563 default:
1564 return -EOPNOTSUPP;
1565 }
1566 }
1567