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 pr_fmt(fmt) "kvm-s390: " fmt 14 15 #include <linux/compiler.h> 16 #include <linux/entry-virt.h> 17 #include <linux/export.h> 18 #include <linux/err.h> 19 #include <linux/fs.h> 20 #include <linux/hrtimer.h> 21 #include <linux/init.h> 22 #include <linux/kvm.h> 23 #include <linux/kvm_host.h> 24 #include <linux/mman.h> 25 #include <linux/module.h> 26 #include <linux/moduleparam.h> 27 #include <linux/cpufeature.h> 28 #include <linux/random.h> 29 #include <linux/slab.h> 30 #include <linux/timer.h> 31 #include <linux/vmalloc.h> 32 #include <linux/bitmap.h> 33 #include <linux/sched/signal.h> 34 #include <linux/string.h> 35 #include <linux/pgtable.h> 36 #include <linux/mmu_notifier.h> 37 38 #include <asm/access-regs.h> 39 #include <asm/asm-offsets.h> 40 #include <asm/lowcore.h> 41 #include <asm/machine.h> 42 #include <asm/stp.h> 43 #include <asm/gmap_helpers.h> 44 #include <asm/nmi.h> 45 #include <asm/isc.h> 46 #include <asm/sclp.h> 47 #include <asm/cpacf.h> 48 #include <asm/timex.h> 49 #include <asm/asm.h> 50 #include <asm/fpu.h> 51 #include <asm/ap.h> 52 #include <asm/uv.h> 53 #include "kvm-s390.h" 54 #include "gaccess.h" 55 #include "gmap.h" 56 #include "faultin.h" 57 #include "pci.h" 58 59 #define CREATE_TRACE_POINTS 60 #include "trace.h" 61 #include "trace-s390.h" 62 63 #define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */ 64 #define LOCAL_IRQS 32 65 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ 66 (KVM_MAX_VCPUS + LOCAL_IRQS)) 67 68 const struct kvm_stats_desc kvm_vm_stats_desc[] = { 69 KVM_GENERIC_VM_STATS(), 70 STATS_DESC_COUNTER(VM, inject_io), 71 STATS_DESC_COUNTER(VM, io_390_adapter_map), 72 STATS_DESC_COUNTER(VM, io_390_adapter_unmap), 73 STATS_DESC_COUNTER(VM, io_390_inatomic), 74 STATS_DESC_COUNTER(VM, io_flic_inject_airq), 75 STATS_DESC_COUNTER(VM, io_set_adapter_int), 76 STATS_DESC_COUNTER(VM, io_390_inatomic_no_inject), 77 STATS_DESC_COUNTER(VM, inject_float_mchk), 78 STATS_DESC_COUNTER(VM, inject_pfault_done), 79 STATS_DESC_COUNTER(VM, inject_service_signal), 80 STATS_DESC_COUNTER(VM, inject_virtio), 81 STATS_DESC_COUNTER(VM, aen_forward), 82 STATS_DESC_COUNTER(VM, gmap_shadow_reuse), 83 STATS_DESC_COUNTER(VM, gmap_shadow_create), 84 STATS_DESC_COUNTER(VM, gmap_shadow_r1_entry), 85 STATS_DESC_COUNTER(VM, gmap_shadow_r2_entry), 86 STATS_DESC_COUNTER(VM, gmap_shadow_r3_entry), 87 STATS_DESC_COUNTER(VM, gmap_shadow_sg_entry), 88 STATS_DESC_COUNTER(VM, gmap_shadow_pg_entry), 89 }; 90 91 const struct kvm_stats_header kvm_vm_stats_header = { 92 .name_size = KVM_STATS_NAME_SIZE, 93 .num_desc = ARRAY_SIZE(kvm_vm_stats_desc), 94 .id_offset = sizeof(struct kvm_stats_header), 95 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE, 96 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE + 97 sizeof(kvm_vm_stats_desc), 98 }; 99 100 const struct kvm_stats_desc kvm_vcpu_stats_desc[] = { 101 KVM_GENERIC_VCPU_STATS(), 102 STATS_DESC_COUNTER(VCPU, exit_userspace), 103 STATS_DESC_COUNTER(VCPU, exit_null), 104 STATS_DESC_COUNTER(VCPU, exit_external_request), 105 STATS_DESC_COUNTER(VCPU, exit_io_request), 106 STATS_DESC_COUNTER(VCPU, exit_external_interrupt), 107 STATS_DESC_COUNTER(VCPU, exit_stop_request), 108 STATS_DESC_COUNTER(VCPU, exit_validity), 109 STATS_DESC_COUNTER(VCPU, exit_instruction), 110 STATS_DESC_COUNTER(VCPU, exit_pei), 111 STATS_DESC_COUNTER(VCPU, halt_no_poll_steal), 112 STATS_DESC_COUNTER(VCPU, instruction_lctl), 113 STATS_DESC_COUNTER(VCPU, instruction_lctlg), 114 STATS_DESC_COUNTER(VCPU, instruction_stctl), 115 STATS_DESC_COUNTER(VCPU, instruction_stctg), 116 STATS_DESC_COUNTER(VCPU, exit_program_interruption), 117 STATS_DESC_COUNTER(VCPU, exit_instr_and_program), 118 STATS_DESC_COUNTER(VCPU, exit_operation_exception), 119 STATS_DESC_COUNTER(VCPU, deliver_ckc), 120 STATS_DESC_COUNTER(VCPU, deliver_cputm), 121 STATS_DESC_COUNTER(VCPU, deliver_external_call), 122 STATS_DESC_COUNTER(VCPU, deliver_emergency_signal), 123 STATS_DESC_COUNTER(VCPU, deliver_service_signal), 124 STATS_DESC_COUNTER(VCPU, deliver_virtio), 125 STATS_DESC_COUNTER(VCPU, deliver_stop_signal), 126 STATS_DESC_COUNTER(VCPU, deliver_prefix_signal), 127 STATS_DESC_COUNTER(VCPU, deliver_restart_signal), 128 STATS_DESC_COUNTER(VCPU, deliver_program), 129 STATS_DESC_COUNTER(VCPU, deliver_io), 130 STATS_DESC_COUNTER(VCPU, deliver_machine_check), 131 STATS_DESC_COUNTER(VCPU, exit_wait_state), 132 STATS_DESC_COUNTER(VCPU, inject_ckc), 133 STATS_DESC_COUNTER(VCPU, inject_cputm), 134 STATS_DESC_COUNTER(VCPU, inject_external_call), 135 STATS_DESC_COUNTER(VCPU, inject_emergency_signal), 136 STATS_DESC_COUNTER(VCPU, inject_mchk), 137 STATS_DESC_COUNTER(VCPU, inject_pfault_init), 138 STATS_DESC_COUNTER(VCPU, inject_program), 139 STATS_DESC_COUNTER(VCPU, inject_restart), 140 STATS_DESC_COUNTER(VCPU, inject_set_prefix), 141 STATS_DESC_COUNTER(VCPU, inject_stop_signal), 142 STATS_DESC_COUNTER(VCPU, instruction_epsw), 143 STATS_DESC_COUNTER(VCPU, instruction_gs), 144 STATS_DESC_COUNTER(VCPU, instruction_io_other), 145 STATS_DESC_COUNTER(VCPU, instruction_lpsw), 146 STATS_DESC_COUNTER(VCPU, instruction_lpswe), 147 STATS_DESC_COUNTER(VCPU, instruction_lpswey), 148 STATS_DESC_COUNTER(VCPU, instruction_pfmf), 149 STATS_DESC_COUNTER(VCPU, instruction_ptff), 150 STATS_DESC_COUNTER(VCPU, instruction_sck), 151 STATS_DESC_COUNTER(VCPU, instruction_sckpf), 152 STATS_DESC_COUNTER(VCPU, instruction_stidp), 153 STATS_DESC_COUNTER(VCPU, instruction_spx), 154 STATS_DESC_COUNTER(VCPU, instruction_stpx), 155 STATS_DESC_COUNTER(VCPU, instruction_stap), 156 STATS_DESC_COUNTER(VCPU, instruction_iske), 157 STATS_DESC_COUNTER(VCPU, instruction_ri), 158 STATS_DESC_COUNTER(VCPU, instruction_rrbe), 159 STATS_DESC_COUNTER(VCPU, instruction_sske), 160 STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock), 161 STATS_DESC_COUNTER(VCPU, instruction_stsi), 162 STATS_DESC_COUNTER(VCPU, instruction_stfl), 163 STATS_DESC_COUNTER(VCPU, instruction_tb), 164 STATS_DESC_COUNTER(VCPU, instruction_tpi), 165 STATS_DESC_COUNTER(VCPU, instruction_tprot), 166 STATS_DESC_COUNTER(VCPU, instruction_tsch), 167 STATS_DESC_COUNTER(VCPU, instruction_sie), 168 STATS_DESC_COUNTER(VCPU, instruction_essa), 169 STATS_DESC_COUNTER(VCPU, instruction_sthyi), 170 STATS_DESC_COUNTER(VCPU, instruction_sigp_sense), 171 STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running), 172 STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call), 173 STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency), 174 STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency), 175 STATS_DESC_COUNTER(VCPU, instruction_sigp_start), 176 STATS_DESC_COUNTER(VCPU, instruction_sigp_stop), 177 STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status), 178 STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status), 179 STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status), 180 STATS_DESC_COUNTER(VCPU, instruction_sigp_arch), 181 STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix), 182 STATS_DESC_COUNTER(VCPU, instruction_sigp_restart), 183 STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset), 184 STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset), 185 STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown), 186 STATS_DESC_COUNTER(VCPU, instruction_diagnose_10), 187 STATS_DESC_COUNTER(VCPU, instruction_diagnose_44), 188 STATS_DESC_COUNTER(VCPU, instruction_diagnose_9c), 189 STATS_DESC_COUNTER(VCPU, diag_9c_ignored), 190 STATS_DESC_COUNTER(VCPU, diag_9c_forward), 191 STATS_DESC_COUNTER(VCPU, instruction_diagnose_258), 192 STATS_DESC_COUNTER(VCPU, instruction_diagnose_308), 193 STATS_DESC_COUNTER(VCPU, instruction_diagnose_500), 194 STATS_DESC_COUNTER(VCPU, instruction_diagnose_other), 195 STATS_DESC_COUNTER(VCPU, pfault_sync), 196 STATS_DESC_COUNTER(VCPU, signal_exits) 197 }; 198 199 const struct kvm_stats_header kvm_vcpu_stats_header = { 200 .name_size = KVM_STATS_NAME_SIZE, 201 .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc), 202 .id_offset = sizeof(struct kvm_stats_header), 203 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE, 204 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE + 205 sizeof(kvm_vcpu_stats_desc), 206 }; 207 208 /* allow nested virtualization in KVM (if enabled by user space) */ 209 static int nested; 210 module_param(nested, int, S_IRUGO); 211 MODULE_PARM_DESC(nested, "Nested virtualization support"); 212 213 /* allow 1m huge page guest backing */ 214 static int hpage; 215 module_param(hpage, int, 0444); 216 MODULE_PARM_DESC(hpage, "1m huge page backing support"); 217 218 /* allow 2g huge page guest backing */ 219 static int hpage_2g; 220 module_param(hpage_2g, int, 0444); 221 MODULE_PARM_DESC(hpage_2g, "2g huge page backing support"); 222 223 /* maximum percentage of steal time for polling. >100 is treated like 100 */ 224 static u8 halt_poll_max_steal = 10; 225 module_param(halt_poll_max_steal, byte, 0644); 226 MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling"); 227 228 /* if set to true, the GISA will be initialized and used if available */ 229 static bool use_gisa = true; 230 module_param(use_gisa, bool, 0644); 231 MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it."); 232 233 /* maximum diag9c forwarding per second */ 234 unsigned int diag9c_forwarding_hz; 235 module_param(diag9c_forwarding_hz, uint, 0644); 236 MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off"); 237 238 /* 239 * allow asynchronous deinit for protected guests; enable by default since 240 * the feature is opt-in anyway 241 */ 242 static int async_destroy = 1; 243 module_param(async_destroy, int, 0444); 244 MODULE_PARM_DESC(async_destroy, "Asynchronous destroy for protected guests"); 245 246 #define HMFAI_DWORDS 16 247 /* 248 * Base feature mask that defines default mask for facilities. Consists of the 249 * defines in FACILITIES_KVM and the non-hypervisor managed bits. 250 */ 251 static unsigned long kvm_s390_fac_base[HMFAI_DWORDS] = { FACILITIES_KVM }; 252 static_assert(ARRAY_SIZE(((long[]){ FACILITIES_KVM })) <= HMFAI_DWORDS); 253 static_assert(ARRAY_SIZE(kvm_s390_fac_base) <= S390_ARCH_FAC_MASK_SIZE_U64); 254 static_assert(ARRAY_SIZE(kvm_s390_fac_base) <= S390_ARCH_FAC_LIST_SIZE_U64); 255 static_assert(ARRAY_SIZE(kvm_s390_fac_base) <= ARRAY_SIZE(stfle_fac_list)); 256 257 /* 258 * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL 259 * and defines the facilities that can be enabled via a cpu model. 260 */ 261 static const unsigned long kvm_s390_fac_ext[] = { FACILITIES_KVM_CPUMODEL }; 262 static_assert(ARRAY_SIZE(kvm_s390_fac_ext) <= S390_ARCH_FAC_MASK_SIZE_U64); 263 static_assert(ARRAY_SIZE(kvm_s390_fac_ext) <= S390_ARCH_FAC_LIST_SIZE_U64); 264 static_assert(ARRAY_SIZE(kvm_s390_fac_ext) <= ARRAY_SIZE(stfle_fac_list)); 265 266 /* available cpu features supported by kvm */ 267 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 268 /* available subfunctions indicated via query / "test bit" */ 269 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc; 270 271 debug_info_t *kvm_s390_dbf; 272 debug_info_t *kvm_s390_dbf_uv; 273 274 /* Section: not file related */ 275 /* forward declarations */ 276 static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta) 277 { 278 u8 delta_idx = 0; 279 280 /* 281 * The TOD jumps by delta, we have to compensate this by adding 282 * -delta to the epoch. 283 */ 284 delta = -delta; 285 286 /* sign-extension - we're adding to signed values below */ 287 if ((s64)delta < 0) 288 delta_idx = -1; 289 290 scb->epoch += delta; 291 if (scb->ecd & ECD_MEF) { 292 scb->epdx += delta_idx; 293 if (scb->epoch < delta) 294 scb->epdx += 1; 295 } 296 } 297 298 /* 299 * This callback is executed during stop_machine(). All CPUs are therefore 300 * temporarily stopped. In order not to change guest behavior, we have to 301 * disable preemption whenever we touch the epoch of kvm and the VCPUs, 302 * so a CPU won't be stopped while calculating with the epoch. 303 */ 304 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val, 305 void *v) 306 { 307 struct kvm *kvm; 308 struct kvm_vcpu *vcpu; 309 unsigned long i; 310 unsigned long long *delta = v; 311 312 list_for_each_entry(kvm, &vm_list, vm_list) { 313 kvm_for_each_vcpu(i, vcpu, kvm) { 314 kvm_clock_sync_scb(vcpu->arch.sie_block, *delta); 315 if (i == 0) { 316 kvm->arch.epoch = vcpu->arch.sie_block->epoch; 317 kvm->arch.epdx = vcpu->arch.sie_block->epdx; 318 } 319 if (vcpu->arch.cputm_enabled) 320 vcpu->arch.cputm_start += *delta; 321 if (vcpu->arch.vsie_block) 322 kvm_clock_sync_scb(vcpu->arch.vsie_block, 323 *delta); 324 } 325 } 326 return NOTIFY_OK; 327 } 328 329 static struct notifier_block kvm_clock_notifier = { 330 .notifier_call = kvm_clock_sync, 331 }; 332 333 static void allow_cpu_feat(unsigned long nr) 334 { 335 set_bit_inv(nr, kvm_s390_available_cpu_feat); 336 } 337 338 static inline int plo_test_bit(unsigned char nr) 339 { 340 unsigned long function = (unsigned long)nr | 0x100; 341 int cc; 342 343 asm volatile( 344 " lgr 0,%[function]\n" 345 /* Parameter registers are ignored for "test bit" */ 346 " plo 0,0,0,0(0)\n" 347 CC_IPM(cc) 348 : CC_OUT(cc, cc) 349 : [function] "d" (function) 350 : CC_CLOBBER_LIST("0")); 351 return CC_TRANSFORM(cc) == 0; 352 } 353 354 static __always_inline void pfcr_query(u8 (*query)[16]) 355 { 356 asm volatile( 357 " lghi 0,0\n" 358 " .insn rsy,0xeb0000000016,0,0,%[query]" 359 : [query] "=QS" (*query) 360 : 361 : "cc", "0"); 362 } 363 364 static __always_inline void __sortl_query(u8 (*query)[32]) 365 { 366 asm volatile( 367 " lghi 0,0\n" 368 " la 1,%[query]\n" 369 /* Parameter registers are ignored */ 370 " .insn rre,0xb9380000,2,4" 371 : [query] "=R" (*query) 372 : 373 : "cc", "0", "1"); 374 } 375 376 static __always_inline void __dfltcc_query(u8 (*query)[32]) 377 { 378 asm volatile( 379 " lghi 0,0\n" 380 " la 1,%[query]\n" 381 /* Parameter registers are ignored */ 382 " .insn rrf,0xb9390000,2,4,6,0" 383 : [query] "=R" (*query) 384 : 385 : "cc", "0", "1"); 386 } 387 388 static void __init kvm_s390_cpu_feat_init(void) 389 { 390 int i; 391 392 for (i = 0; i < 256; ++i) { 393 if (plo_test_bit(i)) 394 kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7); 395 } 396 397 if (test_facility(28)) /* TOD-clock steering */ 398 ptff(kvm_s390_available_subfunc.ptff, 399 sizeof(kvm_s390_available_subfunc.ptff), 400 PTFF_QAF); 401 402 if (test_facility(17)) { /* MSA */ 403 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *) 404 kvm_s390_available_subfunc.kmac); 405 __cpacf_query(CPACF_KMC, (cpacf_mask_t *) 406 kvm_s390_available_subfunc.kmc); 407 __cpacf_query(CPACF_KM, (cpacf_mask_t *) 408 kvm_s390_available_subfunc.km); 409 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *) 410 kvm_s390_available_subfunc.kimd); 411 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *) 412 kvm_s390_available_subfunc.klmd); 413 } 414 if (test_facility(76)) /* MSA3 */ 415 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *) 416 kvm_s390_available_subfunc.pckmo); 417 if (test_facility(77)) { /* MSA4 */ 418 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *) 419 kvm_s390_available_subfunc.kmctr); 420 __cpacf_query(CPACF_KMF, (cpacf_mask_t *) 421 kvm_s390_available_subfunc.kmf); 422 __cpacf_query(CPACF_KMO, (cpacf_mask_t *) 423 kvm_s390_available_subfunc.kmo); 424 __cpacf_query(CPACF_PCC, (cpacf_mask_t *) 425 kvm_s390_available_subfunc.pcc); 426 } 427 if (test_facility(57)) /* MSA5 */ 428 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *) 429 kvm_s390_available_subfunc.ppno); 430 431 if (test_facility(146)) /* MSA8 */ 432 __cpacf_query(CPACF_KMA, (cpacf_mask_t *) 433 kvm_s390_available_subfunc.kma); 434 435 if (test_facility(155)) /* MSA9 */ 436 __cpacf_query(CPACF_KDSA, (cpacf_mask_t *) 437 kvm_s390_available_subfunc.kdsa); 438 439 if (test_facility(150)) /* SORTL */ 440 __sortl_query(&kvm_s390_available_subfunc.sortl); 441 442 if (test_facility(151)) /* DFLTCC */ 443 __dfltcc_query(&kvm_s390_available_subfunc.dfltcc); 444 445 if (test_facility(201)) /* PFCR */ 446 pfcr_query(&kvm_s390_available_subfunc.pfcr); 447 448 if (machine_has_esop()) 449 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP); 450 /* 451 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow), 452 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing). 453 */ 454 if (!sclp.has_sief2 || !machine_has_esop() || !sclp.has_64bscao || 455 !test_facility(3) || !nested) 456 return; 457 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2); 458 if (sclp.has_64bscao) 459 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO); 460 if (sclp.has_siif) 461 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF); 462 if (sclp.has_gpere) 463 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE); 464 if (sclp.has_gsls) 465 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS); 466 if (sclp.has_ib) 467 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB); 468 if (sclp.has_cei) 469 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI); 470 if (sclp.has_ibs) 471 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS); 472 if (sclp.has_kss) 473 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS); 474 if (sclp.has_astfleie2) 475 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ASTFLEIE2); 476 /* 477 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make 478 * all skey handling functions read/set the skey from the PGSTE 479 * instead of the real storage key. 480 * 481 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make 482 * pages being detected as preserved although they are resident. 483 * 484 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will 485 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY. 486 * 487 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and 488 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be 489 * correctly shadowed. We can do that for the PGSTE but not for PTE.I. 490 * 491 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We 492 * cannot easily shadow the SCA because of the ipte lock. 493 */ 494 } 495 496 static int __init __kvm_s390_init(void) 497 { 498 int rc = -ENOMEM; 499 500 kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long)); 501 if (!kvm_s390_dbf) 502 return -ENOMEM; 503 504 kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long)); 505 if (!kvm_s390_dbf_uv) 506 goto err_kvm_uv; 507 508 if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) || 509 debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view)) 510 goto err_debug_view; 511 512 kvm_s390_cpu_feat_init(); 513 514 /* Register floating interrupt controller interface. */ 515 rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC); 516 if (rc) { 517 pr_err("A FLIC registration call failed with rc=%d\n", rc); 518 goto err_flic; 519 } 520 521 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) { 522 rc = kvm_s390_pci_init(); 523 if (rc) { 524 pr_err("Unable to allocate AIFT for PCI\n"); 525 goto err_pci; 526 } 527 } 528 529 rc = kvm_s390_gib_init(GAL_ISC); 530 if (rc) 531 goto err_gib; 532 533 atomic_notifier_chain_register(&s390_epoch_delta_notifier, 534 &kvm_clock_notifier); 535 536 return 0; 537 538 err_gib: 539 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 540 kvm_s390_pci_exit(); 541 err_pci: 542 err_flic: 543 err_debug_view: 544 debug_unregister(kvm_s390_dbf_uv); 545 err_kvm_uv: 546 debug_unregister(kvm_s390_dbf); 547 return rc; 548 } 549 550 static void __kvm_s390_exit(void) 551 { 552 atomic_notifier_chain_unregister(&s390_epoch_delta_notifier, 553 &kvm_clock_notifier); 554 555 kvm_s390_gib_destroy(); 556 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 557 kvm_s390_pci_exit(); 558 debug_unregister(kvm_s390_dbf); 559 debug_unregister(kvm_s390_dbf_uv); 560 } 561 562 static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op, 563 unsigned long addr, union skey skey) 564 { 565 union asce asce = kvm->arch.gmap->asce; 566 gfn_t gfn = gpa_to_gfn(addr); 567 int r; 568 569 guard(read_lock)(&kvm->mmu_lock); 570 571 switch (op) { 572 case KVM_S390_KEYOP_SSKE: 573 r = dat_cond_set_storage_key(mc, asce, gfn, skey, &skey, 0, 0, 0); 574 if (r >= 0) 575 return skey.skey; 576 break; 577 case KVM_S390_KEYOP_ISKE: 578 r = dat_get_storage_key(asce, gfn, &skey); 579 if (!r) 580 return skey.skey; 581 break; 582 case KVM_S390_KEYOP_RRBE: 583 r = dat_reset_reference_bit(asce, gfn); 584 if (r > 0) 585 return r << 1; 586 break; 587 default: 588 return -EINVAL; 589 } 590 return r; 591 } 592 593 /* Section: device related */ 594 long kvm_arch_dev_ioctl(struct file *filp, 595 unsigned int ioctl, unsigned long arg) 596 { 597 if (ioctl == KVM_S390_ENABLE_SIE) 598 return 0; 599 return -EINVAL; 600 } 601 602 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 603 { 604 int r; 605 606 switch (ext) { 607 case KVM_CAP_S390_PSW: 608 case KVM_CAP_S390_GMAP: 609 #ifdef CONFIG_KVM_S390_UCONTROL 610 case KVM_CAP_S390_UCONTROL: 611 #endif 612 case KVM_CAP_ASYNC_PF: 613 case KVM_CAP_SYNC_REGS: 614 case KVM_CAP_ONE_REG: 615 case KVM_CAP_ENABLE_CAP: 616 case KVM_CAP_S390_CSS_SUPPORT: 617 case KVM_CAP_IOEVENTFD: 618 case KVM_CAP_S390_IRQCHIP: 619 case KVM_CAP_VM_ATTRIBUTES: 620 case KVM_CAP_MP_STATE: 621 case KVM_CAP_IMMEDIATE_EXIT: 622 case KVM_CAP_S390_INJECT_IRQ: 623 case KVM_CAP_S390_USER_SIGP: 624 case KVM_CAP_S390_USER_STSI: 625 case KVM_CAP_S390_SKEYS: 626 case KVM_CAP_S390_IRQ_STATE: 627 case KVM_CAP_S390_USER_INSTR0: 628 case KVM_CAP_S390_CMMA_MIGRATION: 629 case KVM_CAP_S390_AIS: 630 case KVM_CAP_S390_AIS_MIGRATION: 631 case KVM_CAP_S390_VCPU_RESETS: 632 case KVM_CAP_SET_GUEST_DEBUG: 633 case KVM_CAP_S390_DIAG318: 634 case KVM_CAP_IRQFD_RESAMPLE: 635 case KVM_CAP_S390_USER_OPEREXEC: 636 case KVM_CAP_S390_KEYOP: 637 case KVM_CAP_S390_VSIE_ESAMODE: 638 case KVM_CAP_PRE_FAULT_MEMORY: 639 r = 1; 640 break; 641 case KVM_CAP_SET_GUEST_DEBUG2: 642 r = KVM_GUESTDBG_VALID_MASK; 643 break; 644 case KVM_CAP_S390_HPAGE_1M: 645 r = 0; 646 if (hpage && !(kvm && kvm_is_ucontrol(kvm))) 647 r = 1; 648 break; 649 case KVM_CAP_S390_HPAGE_2G: 650 r = 0; 651 if (hpage_2g && !(kvm && kvm_is_ucontrol(kvm))) 652 r = 1; 653 break; 654 case KVM_CAP_S390_MEM_OP: 655 r = MEM_OP_MAX_SIZE; 656 break; 657 case KVM_CAP_S390_MEM_OP_EXTENSION: 658 /* 659 * Flag bits indicating which extensions are supported. 660 * If r > 0, the base extension must also be supported/indicated, 661 * in order to maintain backwards compatibility. 662 */ 663 r = KVM_S390_MEMOP_EXTENSION_CAP_BASE | 664 KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG; 665 break; 666 case KVM_CAP_NR_VCPUS: 667 case KVM_CAP_MAX_VCPUS: 668 case KVM_CAP_MAX_VCPU_ID: 669 /* 670 * Return the same value for KVM_CAP_MAX_VCPUS and 671 * KVM_CAP_MAX_VCPU_ID to conform with the KVM API. 672 */ 673 r = KVM_S390_ESCA_CPU_SLOTS; 674 if (!kvm_s390_use_sca_entries()) 675 r = KVM_MAX_VCPUS; 676 if (ext == KVM_CAP_NR_VCPUS) 677 r = min_t(unsigned int, num_online_cpus(), r); 678 break; 679 case KVM_CAP_S390_COW: 680 r = machine_has_esop(); 681 break; 682 case KVM_CAP_S390_VECTOR_REGISTERS: 683 r = test_facility(129); 684 break; 685 case KVM_CAP_S390_RI: 686 r = test_facility(64); 687 break; 688 case KVM_CAP_S390_GS: 689 r = test_facility(133); 690 break; 691 case KVM_CAP_S390_BPB: 692 r = test_facility(82); 693 break; 694 case KVM_CAP_S390_PROTECTED_ASYNC_DISABLE: 695 r = async_destroy && is_prot_virt_host(); 696 break; 697 case KVM_CAP_S390_PROTECTED: 698 r = is_prot_virt_host(); 699 break; 700 case KVM_CAP_S390_PROTECTED_DUMP: { 701 u64 pv_cmds_dump[] = { 702 BIT_UVC_CMD_DUMP_INIT, 703 BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE, 704 BIT_UVC_CMD_DUMP_CPU, 705 BIT_UVC_CMD_DUMP_COMPLETE, 706 }; 707 int i; 708 709 r = is_prot_virt_host(); 710 711 for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) { 712 if (!test_bit_inv(pv_cmds_dump[i], 713 (unsigned long *)&uv_info.inst_calls_list)) { 714 r = 0; 715 break; 716 } 717 } 718 break; 719 } 720 case KVM_CAP_S390_ZPCI_OP: 721 r = kvm_s390_pci_interp_allowed(); 722 break; 723 case KVM_CAP_S390_CPU_TOPOLOGY: 724 r = test_facility(11); 725 break; 726 default: 727 r = 0; 728 } 729 return r; 730 } 731 732 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot) 733 { 734 gfn_t last_gfn = memslot->base_gfn + memslot->npages; 735 736 scoped_guard(read_lock, &kvm->mmu_lock) 737 gmap_sync_dirty_log(kvm->arch.gmap, memslot->base_gfn, last_gfn); 738 } 739 740 /* Section: vm related */ 741 static void sca_del_vcpu(struct kvm_vcpu *vcpu); 742 743 /* 744 * Get (and clear) the dirty memory log for a memory slot. 745 */ 746 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, 747 struct kvm_dirty_log *log) 748 { 749 int r; 750 unsigned long n; 751 struct kvm_memory_slot *memslot; 752 int is_dirty; 753 754 if (kvm_is_ucontrol(kvm)) 755 return -EINVAL; 756 757 mutex_lock(&kvm->slots_lock); 758 759 r = -EINVAL; 760 if (log->slot >= KVM_USER_MEM_SLOTS) 761 goto out; 762 763 r = kvm_get_dirty_log(kvm, log, &is_dirty, &memslot); 764 if (r) 765 goto out; 766 767 /* Clear the dirty log */ 768 if (is_dirty) { 769 n = kvm_dirty_bitmap_bytes(memslot); 770 memset(memslot->dirty_bitmap, 0, n); 771 } 772 r = 0; 773 out: 774 mutex_unlock(&kvm->slots_lock); 775 return r; 776 } 777 778 static void icpt_operexc_on_all_vcpus(struct kvm *kvm) 779 { 780 unsigned long i; 781 struct kvm_vcpu *vcpu; 782 783 kvm_for_each_vcpu(i, vcpu, kvm) { 784 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu); 785 } 786 } 787 788 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) 789 { 790 int r; 791 792 if (cap->flags) 793 return -EINVAL; 794 795 switch (cap->cap) { 796 case KVM_CAP_S390_IRQCHIP: 797 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP"); 798 kvm->arch.use_irqchip = 1; 799 r = 0; 800 break; 801 case KVM_CAP_S390_USER_SIGP: 802 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP"); 803 kvm->arch.user_sigp = 1; 804 r = 0; 805 break; 806 case KVM_CAP_S390_VECTOR_REGISTERS: 807 mutex_lock(&kvm->lock); 808 if (kvm->created_vcpus) { 809 r = -EBUSY; 810 } else if (cpu_has_vx()) { 811 set_kvm_facility(kvm->arch.model.fac_mask, 129); 812 set_kvm_facility(kvm->arch.model.fac_list, 129); 813 if (test_facility(134)) { 814 set_kvm_facility(kvm->arch.model.fac_mask, 134); 815 set_kvm_facility(kvm->arch.model.fac_list, 134); 816 } 817 if (test_facility(135)) { 818 set_kvm_facility(kvm->arch.model.fac_mask, 135); 819 set_kvm_facility(kvm->arch.model.fac_list, 135); 820 } 821 if (test_facility(148)) { 822 set_kvm_facility(kvm->arch.model.fac_mask, 148); 823 set_kvm_facility(kvm->arch.model.fac_list, 148); 824 } 825 if (test_facility(152)) { 826 set_kvm_facility(kvm->arch.model.fac_mask, 152); 827 set_kvm_facility(kvm->arch.model.fac_list, 152); 828 } 829 if (test_facility(192)) { 830 set_kvm_facility(kvm->arch.model.fac_mask, 192); 831 set_kvm_facility(kvm->arch.model.fac_list, 192); 832 } 833 if (test_facility(198)) { 834 set_kvm_facility(kvm->arch.model.fac_mask, 198); 835 set_kvm_facility(kvm->arch.model.fac_list, 198); 836 } 837 if (test_facility(199)) { 838 set_kvm_facility(kvm->arch.model.fac_mask, 199); 839 set_kvm_facility(kvm->arch.model.fac_list, 199); 840 } 841 r = 0; 842 } else 843 r = -EINVAL; 844 mutex_unlock(&kvm->lock); 845 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s", 846 r ? "(not available)" : "(success)"); 847 break; 848 case KVM_CAP_S390_RI: 849 r = -EINVAL; 850 mutex_lock(&kvm->lock); 851 if (kvm->created_vcpus) { 852 r = -EBUSY; 853 } else if (test_facility(64)) { 854 set_kvm_facility(kvm->arch.model.fac_mask, 64); 855 set_kvm_facility(kvm->arch.model.fac_list, 64); 856 r = 0; 857 } 858 mutex_unlock(&kvm->lock); 859 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s", 860 r ? "(not available)" : "(success)"); 861 break; 862 case KVM_CAP_S390_AIS: 863 mutex_lock(&kvm->lock); 864 if (kvm->created_vcpus) { 865 r = -EBUSY; 866 } else { 867 set_kvm_facility(kvm->arch.model.fac_mask, 72); 868 set_kvm_facility(kvm->arch.model.fac_list, 72); 869 r = 0; 870 } 871 mutex_unlock(&kvm->lock); 872 VM_EVENT(kvm, 3, "ENABLE: AIS %s", 873 r ? "(not available)" : "(success)"); 874 break; 875 case KVM_CAP_S390_GS: 876 r = -EINVAL; 877 mutex_lock(&kvm->lock); 878 if (kvm->created_vcpus) { 879 r = -EBUSY; 880 } else if (test_facility(133)) { 881 set_kvm_facility(kvm->arch.model.fac_mask, 133); 882 set_kvm_facility(kvm->arch.model.fac_list, 133); 883 r = 0; 884 } 885 mutex_unlock(&kvm->lock); 886 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s", 887 r ? "(not available)" : "(success)"); 888 break; 889 case KVM_CAP_S390_HPAGE_1M: 890 mutex_lock(&kvm->lock); 891 if (kvm->created_vcpus) 892 r = -EBUSY; 893 else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm)) 894 r = -EINVAL; 895 else { 896 r = 0; 897 set_bit(GMAP_FLAG_ALLOW_HPAGE_1M, &kvm->arch.gmap->flags); 898 /* 899 * We might have to create fake 4k page 900 * tables. To avoid that the hardware works on 901 * stale PGSTEs, we emulate these instructions. 902 */ 903 kvm->arch.use_skf = 0; 904 kvm->arch.use_pfmfi = 0; 905 } 906 mutex_unlock(&kvm->lock); 907 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s", 908 r ? "(not available)" : "(success)"); 909 break; 910 case KVM_CAP_S390_HPAGE_2G: 911 mutex_lock(&kvm->lock); 912 if (kvm->created_vcpus) { 913 r = -EBUSY; 914 } else if (!hpage_2g || kvm->arch.use_cmma || kvm_is_ucontrol(kvm)) { 915 r = -EINVAL; 916 } else { 917 r = 0; 918 set_bit(GMAP_FLAG_ALLOW_HPAGE_2G, &kvm->arch.gmap->flags); 919 /* 920 * We might have to create fake 4k page 921 * tables. To avoid that the hardware works on 922 * stale PGSTEs, we emulate these instructions. 923 */ 924 kvm->arch.use_skf = 0; 925 kvm->arch.use_pfmfi = 0; 926 } 927 mutex_unlock(&kvm->lock); 928 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE_2G %s", 929 r ? "(not available)" : "(success)"); 930 break; 931 case KVM_CAP_S390_USER_STSI: 932 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI"); 933 kvm->arch.user_stsi = 1; 934 r = 0; 935 break; 936 case KVM_CAP_S390_USER_INSTR0: 937 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0"); 938 kvm->arch.user_instr0 = 1; 939 icpt_operexc_on_all_vcpus(kvm); 940 r = 0; 941 break; 942 case KVM_CAP_S390_CPU_TOPOLOGY: 943 r = -EINVAL; 944 mutex_lock(&kvm->lock); 945 if (kvm->created_vcpus) { 946 r = -EBUSY; 947 } else if (test_facility(11)) { 948 set_kvm_facility(kvm->arch.model.fac_mask, 11); 949 set_kvm_facility(kvm->arch.model.fac_list, 11); 950 r = 0; 951 } 952 mutex_unlock(&kvm->lock); 953 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_CPU_TOPOLOGY %s", 954 r ? "(not available)" : "(success)"); 955 break; 956 case KVM_CAP_S390_USER_OPEREXEC: 957 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_OPEREXEC"); 958 kvm->arch.user_operexec = 1; 959 icpt_operexc_on_all_vcpus(kvm); 960 r = 0; 961 break; 962 case KVM_CAP_S390_VSIE_ESAMODE: 963 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_VSIE_ESAMODE"); 964 kvm->arch.allow_vsie_esamode = 1; 965 r = 0; 966 break; 967 default: 968 r = -EINVAL; 969 break; 970 } 971 return r; 972 } 973 974 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 975 { 976 int ret; 977 978 switch (attr->attr) { 979 case KVM_S390_VM_MEM_LIMIT_SIZE: 980 ret = 0; 981 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes", 982 kvm->arch.mem_limit); 983 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr)) 984 ret = -EFAULT; 985 break; 986 default: 987 ret = -ENXIO; 988 break; 989 } 990 return ret; 991 } 992 993 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 994 { 995 int ret; 996 997 switch (attr->attr) { 998 case KVM_S390_VM_MEM_ENABLE_CMMA: 999 ret = -ENXIO; 1000 if (!sclp.has_cmma) 1001 break; 1002 1003 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support"); 1004 mutex_lock(&kvm->lock); 1005 if (kvm->created_vcpus) 1006 ret = -EBUSY; 1007 else { 1008 kvm->arch.use_cmma = 1; 1009 /* Not compatible with cmma. */ 1010 kvm->arch.use_pfmfi = 0; 1011 ret = 0; 1012 } 1013 mutex_unlock(&kvm->lock); 1014 break; 1015 case KVM_S390_VM_MEM_CLR_CMMA: { 1016 gfn_t start_gfn = 0; 1017 1018 ret = -ENXIO; 1019 if (!sclp.has_cmma) 1020 break; 1021 ret = -EINVAL; 1022 if (!kvm->arch.use_cmma) 1023 break; 1024 1025 guard(mutex)(&kvm->lock); 1026 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states"); 1027 do { 1028 scoped_guard(read_lock, &kvm->mmu_lock) 1029 start_gfn = dat_reset_cmma(kvm->arch.gmap->asce, start_gfn); 1030 cond_resched(); 1031 } while (start_gfn); 1032 ret = 0; 1033 break; 1034 } 1035 case KVM_S390_VM_MEM_LIMIT_SIZE: { 1036 struct kvm_memslots *slots; 1037 struct kvm_memory_slot *ms; 1038 unsigned long new_limit; 1039 int bkt; 1040 1041 if (kvm_is_ucontrol(kvm)) 1042 return -EINVAL; 1043 1044 if (get_user(new_limit, (u64 __user *)attr->addr)) 1045 return -EFAULT; 1046 1047 guard(mutex)(&kvm->lock); 1048 1049 new_limit = ALIGN(new_limit, HPAGE_SIZE); 1050 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT && 1051 new_limit > kvm->arch.mem_limit) 1052 return -E2BIG; 1053 1054 if (!new_limit) 1055 return -EINVAL; 1056 1057 if (kvm->created_vcpus) 1058 return -EBUSY; 1059 1060 ret = 0; 1061 scoped_guard(mutex, &kvm->slots_lock) { 1062 slots = kvm_memslots(kvm); 1063 if (slots && !kvm_memslots_empty(slots)) { 1064 kvm_for_each_memslot(ms, bkt, slots) { 1065 if (gpa_to_gfn(new_limit) < ms->base_gfn + ms->npages) { 1066 ret = -EBUSY; 1067 break; 1068 } 1069 } 1070 } 1071 if (!ret) 1072 ret = gmap_set_limit(kvm->arch.gmap, gpa_to_gfn(new_limit)); 1073 } 1074 if (ret) 1075 break; 1076 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit); 1077 VM_EVENT(kvm, 3, "New guest asce: 0x%p", (void *)kvm->arch.gmap->asce.val); 1078 break; 1079 } 1080 default: 1081 ret = -ENXIO; 1082 break; 1083 } 1084 return ret; 1085 } 1086 1087 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); 1088 1089 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm) 1090 { 1091 struct kvm_vcpu *vcpu; 1092 unsigned long i; 1093 1094 kvm_s390_vcpu_block_all(kvm); 1095 1096 kvm_for_each_vcpu(i, vcpu, kvm) { 1097 kvm_s390_vcpu_crypto_setup(vcpu); 1098 /* recreate the shadow crycb by leaving the VSIE handler */ 1099 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); 1100 } 1101 1102 kvm_s390_vcpu_unblock_all(kvm); 1103 } 1104 1105 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) 1106 { 1107 mutex_lock(&kvm->lock); 1108 switch (attr->attr) { 1109 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 1110 if (!test_kvm_facility(kvm, 76)) { 1111 mutex_unlock(&kvm->lock); 1112 return -EINVAL; 1113 } 1114 get_random_bytes( 1115 kvm->arch.crypto.crycb->aes_wrapping_key_mask, 1116 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 1117 kvm->arch.crypto.aes_kw = 1; 1118 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); 1119 break; 1120 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 1121 if (!test_kvm_facility(kvm, 76)) { 1122 mutex_unlock(&kvm->lock); 1123 return -EINVAL; 1124 } 1125 get_random_bytes( 1126 kvm->arch.crypto.crycb->dea_wrapping_key_mask, 1127 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 1128 kvm->arch.crypto.dea_kw = 1; 1129 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); 1130 break; 1131 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 1132 if (!test_kvm_facility(kvm, 76)) { 1133 mutex_unlock(&kvm->lock); 1134 return -EINVAL; 1135 } 1136 kvm->arch.crypto.aes_kw = 0; 1137 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, 1138 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 1139 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); 1140 break; 1141 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 1142 if (!test_kvm_facility(kvm, 76)) { 1143 mutex_unlock(&kvm->lock); 1144 return -EINVAL; 1145 } 1146 kvm->arch.crypto.dea_kw = 0; 1147 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, 1148 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 1149 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support"); 1150 break; 1151 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 1152 if (!ap_instructions_available()) { 1153 mutex_unlock(&kvm->lock); 1154 return -EOPNOTSUPP; 1155 } 1156 kvm->arch.crypto.apie = 1; 1157 break; 1158 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 1159 if (!ap_instructions_available()) { 1160 mutex_unlock(&kvm->lock); 1161 return -EOPNOTSUPP; 1162 } 1163 kvm->arch.crypto.apie = 0; 1164 break; 1165 default: 1166 mutex_unlock(&kvm->lock); 1167 return -ENXIO; 1168 } 1169 1170 kvm_s390_vcpu_crypto_reset_all(kvm); 1171 mutex_unlock(&kvm->lock); 1172 return 0; 1173 } 1174 1175 static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu) 1176 { 1177 /* Only set the ECB bits after guest requests zPCI interpretation */ 1178 if (!vcpu->kvm->arch.use_zpci_interp) 1179 return; 1180 1181 vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI; 1182 vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI; 1183 } 1184 1185 void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm) 1186 { 1187 struct kvm_vcpu *vcpu; 1188 unsigned long i; 1189 1190 lockdep_assert_held(&kvm->lock); 1191 1192 if (!kvm_s390_pci_interp_allowed()) 1193 return; 1194 1195 /* 1196 * If host is configured for PCI and the necessary facilities are 1197 * available, turn on interpretation for the life of this guest 1198 */ 1199 kvm->arch.use_zpci_interp = 1; 1200 1201 kvm_s390_vcpu_block_all(kvm); 1202 1203 kvm_for_each_vcpu(i, vcpu, kvm) { 1204 kvm_s390_vcpu_pci_setup(vcpu); 1205 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); 1206 } 1207 1208 kvm_s390_vcpu_unblock_all(kvm); 1209 } 1210 1211 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req) 1212 { 1213 unsigned long cx; 1214 struct kvm_vcpu *vcpu; 1215 1216 kvm_for_each_vcpu(cx, vcpu, kvm) 1217 kvm_s390_sync_request(req, vcpu); 1218 } 1219 1220 /* 1221 * Must be called with kvm->srcu held to avoid races on memslots, and with 1222 * kvm->slots_lock to avoid races with ourselves, kvm_s390_vm_stop_migration(), 1223 * and kvm_s390_get_cmma_bits(). 1224 */ 1225 static int kvm_s390_vm_start_migration(struct kvm *kvm) 1226 { 1227 struct kvm_memory_slot *ms; 1228 struct kvm_memslots *slots; 1229 int bkt; 1230 1231 /* migration mode already enabled */ 1232 if (kvm->arch.migration_mode) 1233 return 0; 1234 slots = kvm_memslots(kvm); 1235 if (!slots || kvm_memslots_empty(slots)) 1236 return -EINVAL; 1237 1238 if (!kvm->arch.use_cmma) { 1239 kvm->arch.migration_mode = 1; 1240 return 0; 1241 } 1242 kvm_for_each_memslot(ms, bkt, slots) { 1243 if (!ms->dirty_bitmap) 1244 return -EINVAL; 1245 } 1246 /* 1247 * Set the flag and let KVM handle ESSA manually, potentially setting 1248 * the cmma_d bit in some PGSTEs and increasing cmma_dirty_pages. 1249 * At this point cmma_dirty_pages is still 0, and all existing PGSTEs 1250 * have their cmma_d bit set to 0. 1251 * Any newly allocated page table has its entries marked as cmma-clean, 1252 * which is fine because the CMMA values are not dirty. 1253 */ 1254 WRITE_ONCE(kvm->arch.migration_mode, 1); 1255 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION); 1256 /* 1257 * Mark all PGSTEs as cmma-dirty, increasing cmma_dirty_pages as needed, 1258 * but without double-counting pages that have become dirty on their own 1259 * in the meantime. 1260 * At this point some pages might have become dirty on their own already 1261 * and cmma_dirty_pages might therefore be non-zero. 1262 */ 1263 gmap_set_cmma_all_dirty(kvm->arch.gmap); 1264 return 0; 1265 } 1266 1267 /* 1268 * Must be called with kvm->slots_lock to avoid races with ourselves, 1269 * kvm_s390_vm_start_migration() and kvm_s390_get_cmma_bits(). 1270 */ 1271 static int kvm_s390_vm_stop_migration(struct kvm *kvm) 1272 { 1273 /* migration mode already disabled */ 1274 if (!kvm->arch.migration_mode) 1275 return 0; 1276 /* 1277 * Unset the flag and propagate to all vCPUs. From now on the cmma_d 1278 * bit will not be touched on any PGSTE. 1279 * At this point cmma_dirty_pages is possibly non-zero, and thus some 1280 * PGSTEs might have cmma_d set. 1281 */ 1282 WRITE_ONCE(kvm->arch.migration_mode, 0); 1283 if (kvm->arch.use_cmma) 1284 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION); 1285 /* Clear cmma_d on all existing PGSTEs and set cmma_dirty_pages to 0. */ 1286 gmap_set_cmma_all_clean(kvm->arch.gmap); 1287 atomic64_set(&kvm->arch.cmma_dirty_pages, 0); 1288 /* 1289 * At this point the system has the expected state: migration_mode is 0, 1290 * cmma_dirty_pages is 0, and all existing PGSTEs have their cmma_d bit 1291 * set to 0. 1292 */ 1293 return 0; 1294 } 1295 1296 static int kvm_s390_vm_set_migration(struct kvm *kvm, 1297 struct kvm_device_attr *attr) 1298 { 1299 int res = -ENXIO; 1300 1301 mutex_lock(&kvm->slots_lock); 1302 switch (attr->attr) { 1303 case KVM_S390_VM_MIGRATION_START: 1304 res = kvm_s390_vm_start_migration(kvm); 1305 break; 1306 case KVM_S390_VM_MIGRATION_STOP: 1307 res = kvm_s390_vm_stop_migration(kvm); 1308 break; 1309 default: 1310 break; 1311 } 1312 mutex_unlock(&kvm->slots_lock); 1313 1314 return res; 1315 } 1316 1317 static int kvm_s390_vm_get_migration(struct kvm *kvm, 1318 struct kvm_device_attr *attr) 1319 { 1320 u64 mig = kvm->arch.migration_mode; 1321 1322 if (attr->attr != KVM_S390_VM_MIGRATION_STATUS) 1323 return -ENXIO; 1324 1325 if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig))) 1326 return -EFAULT; 1327 return 0; 1328 } 1329 1330 static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod); 1331 1332 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1333 { 1334 struct kvm_s390_vm_tod_clock gtod; 1335 1336 if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) 1337 return -EFAULT; 1338 1339 if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx) 1340 return -EINVAL; 1341 __kvm_s390_set_tod_clock(kvm, >od); 1342 1343 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx", 1344 gtod.epoch_idx, gtod.tod); 1345 1346 return 0; 1347 } 1348 1349 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1350 { 1351 u8 gtod_high; 1352 1353 if (copy_from_user(>od_high, (void __user *)attr->addr, 1354 sizeof(gtod_high))) 1355 return -EFAULT; 1356 1357 if (gtod_high != 0) 1358 return -EINVAL; 1359 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high); 1360 1361 return 0; 1362 } 1363 1364 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1365 { 1366 struct kvm_s390_vm_tod_clock gtod = { 0 }; 1367 1368 if (copy_from_user(>od.tod, (void __user *)attr->addr, 1369 sizeof(gtod.tod))) 1370 return -EFAULT; 1371 1372 __kvm_s390_set_tod_clock(kvm, >od); 1373 VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod); 1374 return 0; 1375 } 1376 1377 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1378 { 1379 int ret; 1380 1381 if (attr->flags) 1382 return -EINVAL; 1383 1384 mutex_lock(&kvm->lock); 1385 /* 1386 * For protected guests, the TOD is managed by the ultravisor, so trying 1387 * to change it will never bring the expected results. 1388 */ 1389 if (kvm_s390_pv_is_protected(kvm)) { 1390 ret = -EOPNOTSUPP; 1391 goto out_unlock; 1392 } 1393 1394 switch (attr->attr) { 1395 case KVM_S390_VM_TOD_EXT: 1396 ret = kvm_s390_set_tod_ext(kvm, attr); 1397 break; 1398 case KVM_S390_VM_TOD_HIGH: 1399 ret = kvm_s390_set_tod_high(kvm, attr); 1400 break; 1401 case KVM_S390_VM_TOD_LOW: 1402 ret = kvm_s390_set_tod_low(kvm, attr); 1403 break; 1404 default: 1405 ret = -ENXIO; 1406 break; 1407 } 1408 1409 out_unlock: 1410 mutex_unlock(&kvm->lock); 1411 return ret; 1412 } 1413 1414 static void kvm_s390_get_tod_clock(struct kvm *kvm, 1415 struct kvm_s390_vm_tod_clock *gtod) 1416 { 1417 union tod_clock clk; 1418 1419 preempt_disable(); 1420 1421 store_tod_clock_ext(&clk); 1422 1423 gtod->tod = clk.tod + kvm->arch.epoch; 1424 gtod->epoch_idx = 0; 1425 if (test_kvm_facility(kvm, 139)) { 1426 gtod->epoch_idx = clk.ei + kvm->arch.epdx; 1427 if (gtod->tod < clk.tod) 1428 gtod->epoch_idx += 1; 1429 } 1430 1431 preempt_enable(); 1432 } 1433 1434 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1435 { 1436 struct kvm_s390_vm_tod_clock gtod; 1437 1438 memset(>od, 0, sizeof(gtod)); 1439 kvm_s390_get_tod_clock(kvm, >od); 1440 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1441 return -EFAULT; 1442 1443 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx", 1444 gtod.epoch_idx, gtod.tod); 1445 return 0; 1446 } 1447 1448 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1449 { 1450 u8 gtod_high = 0; 1451 1452 if (copy_to_user((void __user *)attr->addr, >od_high, 1453 sizeof(gtod_high))) 1454 return -EFAULT; 1455 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high); 1456 1457 return 0; 1458 } 1459 1460 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1461 { 1462 u64 gtod; 1463 1464 gtod = kvm_s390_get_tod_clock_fast(kvm); 1465 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1466 return -EFAULT; 1467 VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod); 1468 1469 return 0; 1470 } 1471 1472 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1473 { 1474 int ret; 1475 1476 if (attr->flags) 1477 return -EINVAL; 1478 1479 switch (attr->attr) { 1480 case KVM_S390_VM_TOD_EXT: 1481 ret = kvm_s390_get_tod_ext(kvm, attr); 1482 break; 1483 case KVM_S390_VM_TOD_HIGH: 1484 ret = kvm_s390_get_tod_high(kvm, attr); 1485 break; 1486 case KVM_S390_VM_TOD_LOW: 1487 ret = kvm_s390_get_tod_low(kvm, attr); 1488 break; 1489 default: 1490 ret = -ENXIO; 1491 break; 1492 } 1493 return ret; 1494 } 1495 1496 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1497 { 1498 struct kvm_s390_vm_cpu_processor *proc; 1499 u16 lowest_ibc, unblocked_ibc; 1500 int ret = 0; 1501 1502 mutex_lock(&kvm->lock); 1503 if (kvm->created_vcpus) { 1504 ret = -EBUSY; 1505 goto out; 1506 } 1507 proc = kzalloc_obj(*proc, GFP_KERNEL_ACCOUNT); 1508 if (!proc) { 1509 ret = -ENOMEM; 1510 goto out; 1511 } 1512 if (!copy_from_user(proc, (void __user *)attr->addr, 1513 sizeof(*proc))) { 1514 kvm->arch.model.cpuid = proc->cpuid; 1515 lowest_ibc = sclp.ibc >> 16 & 0xfff; 1516 unblocked_ibc = sclp.ibc & 0xfff; 1517 if (lowest_ibc && proc->ibc) { 1518 if (proc->ibc > unblocked_ibc) 1519 kvm->arch.model.ibc = unblocked_ibc; 1520 else if (proc->ibc < lowest_ibc) 1521 kvm->arch.model.ibc = lowest_ibc; 1522 else 1523 kvm->arch.model.ibc = proc->ibc; 1524 } 1525 memcpy(kvm->arch.model.fac_list, proc->fac_list, 1526 S390_ARCH_FAC_LIST_SIZE_BYTE); 1527 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1528 kvm->arch.model.ibc, 1529 kvm->arch.model.cpuid); 1530 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1531 kvm->arch.model.fac_list[0], 1532 kvm->arch.model.fac_list[1], 1533 kvm->arch.model.fac_list[2]); 1534 } else 1535 ret = -EFAULT; 1536 kfree(proc); 1537 out: 1538 mutex_unlock(&kvm->lock); 1539 return ret; 1540 } 1541 1542 static int kvm_s390_set_processor_feat(struct kvm *kvm, 1543 struct kvm_device_attr *attr) 1544 { 1545 struct kvm_s390_vm_cpu_feat data; 1546 1547 if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data))) 1548 return -EFAULT; 1549 if (!bitmap_subset((unsigned long *) data.feat, 1550 kvm_s390_available_cpu_feat, 1551 KVM_S390_VM_CPU_FEAT_NR_BITS)) 1552 return -EINVAL; 1553 1554 mutex_lock(&kvm->lock); 1555 if (kvm->created_vcpus) { 1556 mutex_unlock(&kvm->lock); 1557 return -EBUSY; 1558 } 1559 bitmap_from_arr64(kvm->arch.cpu_feat, data.feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 1560 mutex_unlock(&kvm->lock); 1561 VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1562 data.feat[0], 1563 data.feat[1], 1564 data.feat[2]); 1565 return 0; 1566 } 1567 1568 static int kvm_s390_set_processor_subfunc(struct kvm *kvm, 1569 struct kvm_device_attr *attr) 1570 { 1571 mutex_lock(&kvm->lock); 1572 if (kvm->created_vcpus) { 1573 mutex_unlock(&kvm->lock); 1574 return -EBUSY; 1575 } 1576 1577 if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr, 1578 sizeof(struct kvm_s390_vm_cpu_subfunc))) { 1579 mutex_unlock(&kvm->lock); 1580 return -EFAULT; 1581 } 1582 mutex_unlock(&kvm->lock); 1583 1584 VM_EVENT(kvm, 3, "SET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1585 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1586 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1587 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1588 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1589 VM_EVENT(kvm, 3, "SET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1590 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1591 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1592 VM_EVENT(kvm, 3, "SET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1593 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1594 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1595 VM_EVENT(kvm, 3, "SET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1596 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1597 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1598 VM_EVENT(kvm, 3, "SET: guest KM subfunc 0x%16.16lx.%16.16lx", 1599 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1600 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1601 VM_EVENT(kvm, 3, "SET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1602 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1603 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1604 VM_EVENT(kvm, 3, "SET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1605 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1606 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1607 VM_EVENT(kvm, 3, "SET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1608 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1609 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1610 VM_EVENT(kvm, 3, "SET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1611 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1612 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1613 VM_EVENT(kvm, 3, "SET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1614 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1615 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1616 VM_EVENT(kvm, 3, "SET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1617 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1618 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1619 VM_EVENT(kvm, 3, "SET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1620 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1621 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1622 VM_EVENT(kvm, 3, "SET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1623 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1624 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1625 VM_EVENT(kvm, 3, "SET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1626 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1627 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1628 VM_EVENT(kvm, 3, "SET: guest KDSA subfunc 0x%16.16lx.%16.16lx", 1629 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], 1630 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); 1631 VM_EVENT(kvm, 3, "SET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1632 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], 1633 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], 1634 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], 1635 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); 1636 VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1637 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], 1638 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], 1639 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], 1640 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); 1641 VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx", 1642 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0], 1643 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]); 1644 1645 return 0; 1646 } 1647 1648 #define KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK \ 1649 ( \ 1650 ((struct kvm_s390_vm_cpu_uv_feat){ \ 1651 .ap = 1, \ 1652 .ap_intr = 1, \ 1653 }) \ 1654 .feat \ 1655 ) 1656 1657 static int kvm_s390_set_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) 1658 { 1659 struct kvm_s390_vm_cpu_uv_feat __user *ptr = (void __user *)attr->addr; 1660 unsigned long data, filter; 1661 1662 filter = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK; 1663 if (get_user(data, &ptr->feat)) 1664 return -EFAULT; 1665 if (!bitmap_subset(&data, &filter, KVM_S390_VM_CPU_UV_FEAT_NR_BITS)) 1666 return -EINVAL; 1667 1668 mutex_lock(&kvm->lock); 1669 if (kvm->created_vcpus) { 1670 mutex_unlock(&kvm->lock); 1671 return -EBUSY; 1672 } 1673 kvm->arch.model.uv_feat_guest.feat = data; 1674 mutex_unlock(&kvm->lock); 1675 1676 VM_EVENT(kvm, 3, "SET: guest UV-feat: 0x%16.16lx", data); 1677 1678 return 0; 1679 } 1680 1681 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1682 { 1683 int ret = -ENXIO; 1684 1685 switch (attr->attr) { 1686 case KVM_S390_VM_CPU_PROCESSOR: 1687 ret = kvm_s390_set_processor(kvm, attr); 1688 break; 1689 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1690 ret = kvm_s390_set_processor_feat(kvm, attr); 1691 break; 1692 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1693 ret = kvm_s390_set_processor_subfunc(kvm, attr); 1694 break; 1695 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: 1696 ret = kvm_s390_set_uv_feat(kvm, attr); 1697 break; 1698 } 1699 return ret; 1700 } 1701 1702 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1703 { 1704 struct kvm_s390_vm_cpu_processor *proc; 1705 int ret = 0; 1706 1707 proc = kzalloc_obj(*proc, GFP_KERNEL_ACCOUNT); 1708 if (!proc) { 1709 ret = -ENOMEM; 1710 goto out; 1711 } 1712 proc->cpuid = kvm->arch.model.cpuid; 1713 proc->ibc = kvm->arch.model.ibc; 1714 memcpy(&proc->fac_list, kvm->arch.model.fac_list, 1715 S390_ARCH_FAC_LIST_SIZE_BYTE); 1716 VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1717 kvm->arch.model.ibc, 1718 kvm->arch.model.cpuid); 1719 VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1720 kvm->arch.model.fac_list[0], 1721 kvm->arch.model.fac_list[1], 1722 kvm->arch.model.fac_list[2]); 1723 if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc))) 1724 ret = -EFAULT; 1725 kfree(proc); 1726 out: 1727 return ret; 1728 } 1729 1730 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr) 1731 { 1732 struct kvm_s390_vm_cpu_machine *mach; 1733 int ret = 0; 1734 1735 mach = kzalloc_obj(*mach, GFP_KERNEL_ACCOUNT); 1736 if (!mach) { 1737 ret = -ENOMEM; 1738 goto out; 1739 } 1740 get_cpu_id((struct cpuid *) &mach->cpuid); 1741 mach->ibc = sclp.ibc; 1742 memcpy(&mach->fac_mask, kvm->arch.model.fac_mask, 1743 S390_ARCH_FAC_LIST_SIZE_BYTE); 1744 memcpy((unsigned long *)&mach->fac_list, stfle_fac_list, 1745 sizeof(stfle_fac_list)); 1746 VM_EVENT(kvm, 3, "GET: host ibc: 0x%4.4x, host cpuid: 0x%16.16llx", 1747 kvm->arch.model.ibc, 1748 kvm->arch.model.cpuid); 1749 VM_EVENT(kvm, 3, "GET: host facmask: 0x%16.16llx.%16.16llx.%16.16llx", 1750 mach->fac_mask[0], 1751 mach->fac_mask[1], 1752 mach->fac_mask[2]); 1753 VM_EVENT(kvm, 3, "GET: host faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1754 mach->fac_list[0], 1755 mach->fac_list[1], 1756 mach->fac_list[2]); 1757 if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach))) 1758 ret = -EFAULT; 1759 kfree(mach); 1760 out: 1761 return ret; 1762 } 1763 1764 static int kvm_s390_get_processor_feat(struct kvm *kvm, 1765 struct kvm_device_attr *attr) 1766 { 1767 struct kvm_s390_vm_cpu_feat data; 1768 1769 bitmap_to_arr64(data.feat, kvm->arch.cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 1770 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1771 return -EFAULT; 1772 VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1773 data.feat[0], 1774 data.feat[1], 1775 data.feat[2]); 1776 return 0; 1777 } 1778 1779 static int kvm_s390_get_machine_feat(struct kvm *kvm, 1780 struct kvm_device_attr *attr) 1781 { 1782 struct kvm_s390_vm_cpu_feat data; 1783 1784 bitmap_to_arr64(data.feat, kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 1785 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1786 return -EFAULT; 1787 VM_EVENT(kvm, 3, "GET: host feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1788 data.feat[0], 1789 data.feat[1], 1790 data.feat[2]); 1791 return 0; 1792 } 1793 1794 static int kvm_s390_get_processor_subfunc(struct kvm *kvm, 1795 struct kvm_device_attr *attr) 1796 { 1797 if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs, 1798 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1799 return -EFAULT; 1800 1801 VM_EVENT(kvm, 3, "GET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1802 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1803 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1804 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1805 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1806 VM_EVENT(kvm, 3, "GET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1807 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1808 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1809 VM_EVENT(kvm, 3, "GET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1810 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1811 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1812 VM_EVENT(kvm, 3, "GET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1813 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1814 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1815 VM_EVENT(kvm, 3, "GET: guest KM subfunc 0x%16.16lx.%16.16lx", 1816 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1817 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1818 VM_EVENT(kvm, 3, "GET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1819 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1820 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1821 VM_EVENT(kvm, 3, "GET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1822 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1823 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1824 VM_EVENT(kvm, 3, "GET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1825 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1826 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1827 VM_EVENT(kvm, 3, "GET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1828 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1829 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1830 VM_EVENT(kvm, 3, "GET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1831 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1832 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1833 VM_EVENT(kvm, 3, "GET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1834 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1835 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1836 VM_EVENT(kvm, 3, "GET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1837 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1838 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1839 VM_EVENT(kvm, 3, "GET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1840 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1841 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1842 VM_EVENT(kvm, 3, "GET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1843 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1844 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1845 VM_EVENT(kvm, 3, "GET: guest KDSA subfunc 0x%16.16lx.%16.16lx", 1846 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], 1847 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); 1848 VM_EVENT(kvm, 3, "GET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1849 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], 1850 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], 1851 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], 1852 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); 1853 VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1854 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], 1855 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], 1856 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], 1857 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); 1858 VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx", 1859 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0], 1860 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]); 1861 1862 return 0; 1863 } 1864 1865 static int kvm_s390_get_machine_subfunc(struct kvm *kvm, 1866 struct kvm_device_attr *attr) 1867 { 1868 if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc, 1869 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1870 return -EFAULT; 1871 1872 VM_EVENT(kvm, 3, "GET: host PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1873 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0], 1874 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1], 1875 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2], 1876 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]); 1877 VM_EVENT(kvm, 3, "GET: host PTFF subfunc 0x%16.16lx.%16.16lx", 1878 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0], 1879 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]); 1880 VM_EVENT(kvm, 3, "GET: host KMAC subfunc 0x%16.16lx.%16.16lx", 1881 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0], 1882 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]); 1883 VM_EVENT(kvm, 3, "GET: host KMC subfunc 0x%16.16lx.%16.16lx", 1884 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0], 1885 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]); 1886 VM_EVENT(kvm, 3, "GET: host KM subfunc 0x%16.16lx.%16.16lx", 1887 ((unsigned long *) &kvm_s390_available_subfunc.km)[0], 1888 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]); 1889 VM_EVENT(kvm, 3, "GET: host KIMD subfunc 0x%16.16lx.%16.16lx", 1890 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0], 1891 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]); 1892 VM_EVENT(kvm, 3, "GET: host KLMD subfunc 0x%16.16lx.%16.16lx", 1893 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0], 1894 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]); 1895 VM_EVENT(kvm, 3, "GET: host PCKMO subfunc 0x%16.16lx.%16.16lx", 1896 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0], 1897 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]); 1898 VM_EVENT(kvm, 3, "GET: host KMCTR subfunc 0x%16.16lx.%16.16lx", 1899 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0], 1900 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]); 1901 VM_EVENT(kvm, 3, "GET: host KMF subfunc 0x%16.16lx.%16.16lx", 1902 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0], 1903 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]); 1904 VM_EVENT(kvm, 3, "GET: host KMO subfunc 0x%16.16lx.%16.16lx", 1905 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0], 1906 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]); 1907 VM_EVENT(kvm, 3, "GET: host PCC subfunc 0x%16.16lx.%16.16lx", 1908 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0], 1909 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]); 1910 VM_EVENT(kvm, 3, "GET: host PPNO subfunc 0x%16.16lx.%16.16lx", 1911 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0], 1912 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]); 1913 VM_EVENT(kvm, 3, "GET: host KMA subfunc 0x%16.16lx.%16.16lx", 1914 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0], 1915 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]); 1916 VM_EVENT(kvm, 3, "GET: host KDSA subfunc 0x%16.16lx.%16.16lx", 1917 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0], 1918 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]); 1919 VM_EVENT(kvm, 3, "GET: host SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1920 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0], 1921 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1], 1922 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2], 1923 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]); 1924 VM_EVENT(kvm, 3, "GET: host DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1925 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0], 1926 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1], 1927 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2], 1928 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]); 1929 VM_EVENT(kvm, 3, "GET: host PFCR subfunc 0x%16.16lx.%16.16lx", 1930 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0], 1931 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]); 1932 1933 return 0; 1934 } 1935 1936 static int kvm_s390_get_processor_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) 1937 { 1938 struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr; 1939 unsigned long feat = kvm->arch.model.uv_feat_guest.feat; 1940 1941 if (put_user(feat, &dst->feat)) 1942 return -EFAULT; 1943 VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat); 1944 1945 return 0; 1946 } 1947 1948 static int kvm_s390_get_machine_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) 1949 { 1950 struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr; 1951 unsigned long feat; 1952 1953 BUILD_BUG_ON(sizeof(*dst) != sizeof(uv_info.uv_feature_indications)); 1954 1955 feat = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK; 1956 if (put_user(feat, &dst->feat)) 1957 return -EFAULT; 1958 VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat); 1959 1960 return 0; 1961 } 1962 1963 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1964 { 1965 int ret = -ENXIO; 1966 1967 switch (attr->attr) { 1968 case KVM_S390_VM_CPU_PROCESSOR: 1969 ret = kvm_s390_get_processor(kvm, attr); 1970 break; 1971 case KVM_S390_VM_CPU_MACHINE: 1972 ret = kvm_s390_get_machine(kvm, attr); 1973 break; 1974 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1975 ret = kvm_s390_get_processor_feat(kvm, attr); 1976 break; 1977 case KVM_S390_VM_CPU_MACHINE_FEAT: 1978 ret = kvm_s390_get_machine_feat(kvm, attr); 1979 break; 1980 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1981 ret = kvm_s390_get_processor_subfunc(kvm, attr); 1982 break; 1983 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 1984 ret = kvm_s390_get_machine_subfunc(kvm, attr); 1985 break; 1986 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: 1987 ret = kvm_s390_get_processor_uv_feat(kvm, attr); 1988 break; 1989 case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST: 1990 ret = kvm_s390_get_machine_uv_feat(kvm, attr); 1991 break; 1992 } 1993 return ret; 1994 } 1995 1996 /** 1997 * kvm_s390_update_topology_change_report - update CPU topology change report 1998 * @kvm: guest KVM description 1999 * @val: set or clear the MTCR bit 2000 * 2001 * Updates the Multiprocessor Topology-Change-Report bit to signal 2002 * the guest with a topology change. 2003 * This is only relevant if the topology facility is present. 2004 */ 2005 static void kvm_s390_update_topology_change_report(struct kvm *kvm, bool val) 2006 { 2007 union sca_utility new, old; 2008 struct esca_block *sca; 2009 2010 sca = kvm->arch.sca; 2011 old = READ_ONCE(sca->utility); 2012 do { 2013 new = old; 2014 new.mtcr = val; 2015 } while (!try_cmpxchg(&sca->utility.val, &old.val, new.val)); 2016 } 2017 2018 static int kvm_s390_set_topo_change_indication(struct kvm *kvm, 2019 struct kvm_device_attr *attr) 2020 { 2021 if (!test_kvm_facility(kvm, 11)) 2022 return -ENXIO; 2023 2024 kvm_s390_update_topology_change_report(kvm, !!attr->attr); 2025 return 0; 2026 } 2027 2028 static int kvm_s390_get_topo_change_indication(struct kvm *kvm, 2029 struct kvm_device_attr *attr) 2030 { 2031 u8 topo; 2032 2033 if (!test_kvm_facility(kvm, 11)) 2034 return -ENXIO; 2035 2036 topo = kvm->arch.sca->utility.mtcr; 2037 2038 return put_user(topo, (u8 __user *)attr->addr); 2039 } 2040 2041 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) 2042 { 2043 int ret; 2044 2045 switch (attr->group) { 2046 case KVM_S390_VM_MEM_CTRL: 2047 ret = kvm_s390_set_mem_control(kvm, attr); 2048 break; 2049 case KVM_S390_VM_TOD: 2050 ret = kvm_s390_set_tod(kvm, attr); 2051 break; 2052 case KVM_S390_VM_CPU_MODEL: 2053 ret = kvm_s390_set_cpu_model(kvm, attr); 2054 break; 2055 case KVM_S390_VM_CRYPTO: 2056 ret = kvm_s390_vm_set_crypto(kvm, attr); 2057 break; 2058 case KVM_S390_VM_MIGRATION: 2059 ret = kvm_s390_vm_set_migration(kvm, attr); 2060 break; 2061 case KVM_S390_VM_CPU_TOPOLOGY: 2062 ret = kvm_s390_set_topo_change_indication(kvm, attr); 2063 break; 2064 default: 2065 ret = -ENXIO; 2066 break; 2067 } 2068 2069 return ret; 2070 } 2071 2072 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) 2073 { 2074 int ret; 2075 2076 switch (attr->group) { 2077 case KVM_S390_VM_MEM_CTRL: 2078 ret = kvm_s390_get_mem_control(kvm, attr); 2079 break; 2080 case KVM_S390_VM_TOD: 2081 ret = kvm_s390_get_tod(kvm, attr); 2082 break; 2083 case KVM_S390_VM_CPU_MODEL: 2084 ret = kvm_s390_get_cpu_model(kvm, attr); 2085 break; 2086 case KVM_S390_VM_MIGRATION: 2087 ret = kvm_s390_vm_get_migration(kvm, attr); 2088 break; 2089 case KVM_S390_VM_CPU_TOPOLOGY: 2090 ret = kvm_s390_get_topo_change_indication(kvm, attr); 2091 break; 2092 default: 2093 ret = -ENXIO; 2094 break; 2095 } 2096 2097 return ret; 2098 } 2099 2100 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) 2101 { 2102 int ret; 2103 2104 switch (attr->group) { 2105 case KVM_S390_VM_MEM_CTRL: 2106 switch (attr->attr) { 2107 case KVM_S390_VM_MEM_ENABLE_CMMA: 2108 case KVM_S390_VM_MEM_CLR_CMMA: 2109 ret = sclp.has_cmma ? 0 : -ENXIO; 2110 break; 2111 case KVM_S390_VM_MEM_LIMIT_SIZE: 2112 ret = 0; 2113 break; 2114 default: 2115 ret = -ENXIO; 2116 break; 2117 } 2118 break; 2119 case KVM_S390_VM_TOD: 2120 switch (attr->attr) { 2121 case KVM_S390_VM_TOD_LOW: 2122 case KVM_S390_VM_TOD_HIGH: 2123 ret = 0; 2124 break; 2125 default: 2126 ret = -ENXIO; 2127 break; 2128 } 2129 break; 2130 case KVM_S390_VM_CPU_MODEL: 2131 switch (attr->attr) { 2132 case KVM_S390_VM_CPU_PROCESSOR: 2133 case KVM_S390_VM_CPU_MACHINE: 2134 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 2135 case KVM_S390_VM_CPU_MACHINE_FEAT: 2136 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 2137 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 2138 case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST: 2139 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: 2140 ret = 0; 2141 break; 2142 default: 2143 ret = -ENXIO; 2144 break; 2145 } 2146 break; 2147 case KVM_S390_VM_CRYPTO: 2148 switch (attr->attr) { 2149 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 2150 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 2151 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 2152 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 2153 ret = 0; 2154 break; 2155 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 2156 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 2157 ret = ap_instructions_available() ? 0 : -ENXIO; 2158 break; 2159 default: 2160 ret = -ENXIO; 2161 break; 2162 } 2163 break; 2164 case KVM_S390_VM_MIGRATION: 2165 ret = 0; 2166 break; 2167 case KVM_S390_VM_CPU_TOPOLOGY: 2168 ret = test_kvm_facility(kvm, 11) ? 0 : -ENXIO; 2169 break; 2170 default: 2171 ret = -ENXIO; 2172 break; 2173 } 2174 2175 return ret; 2176 } 2177 2178 static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 2179 { 2180 union skey *keys; 2181 int i, r = 0; 2182 2183 if (args->flags != 0) 2184 return -EINVAL; 2185 2186 /* Is this guest using storage keys? */ 2187 if (!uses_skeys(kvm->arch.gmap)) 2188 return KVM_S390_GET_SKEYS_NONE; 2189 2190 /* Enforce sane limit on memory allocation */ 2191 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 2192 return -EINVAL; 2193 2194 keys = kvmalloc_array(args->count, sizeof(*keys), GFP_KERNEL_ACCOUNT); 2195 if (!keys) 2196 return -ENOMEM; 2197 2198 scoped_guard(read_lock, &kvm->mmu_lock) { 2199 for (i = 0; i < args->count; i++) { 2200 r = dat_get_storage_key(kvm->arch.gmap->asce, 2201 args->start_gfn + i, keys + i); 2202 if (r) 2203 break; 2204 } 2205 } 2206 2207 if (!r) { 2208 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys, 2209 sizeof(uint8_t) * args->count); 2210 if (r) 2211 r = -EFAULT; 2212 } 2213 2214 kvfree(keys); 2215 return r; 2216 } 2217 2218 static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 2219 { 2220 struct kvm_s390_mmu_cache *mc; 2221 union skey *keys; 2222 int i, r = 0; 2223 2224 if (args->flags != 0) 2225 return -EINVAL; 2226 2227 /* Enforce sane limit on memory allocation */ 2228 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 2229 return -EINVAL; 2230 2231 keys = kvmalloc_array(args->count, sizeof(*keys), GFP_KERNEL_ACCOUNT); 2232 if (!keys) 2233 return -ENOMEM; 2234 2235 r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr, 2236 sizeof(uint8_t) * args->count); 2237 if (r) { 2238 r = -EFAULT; 2239 goto out; 2240 } 2241 2242 /* Enable storage key handling for the guest */ 2243 r = gmap_enable_skeys(kvm->arch.gmap); 2244 if (r) 2245 goto out; 2246 2247 r = -EINVAL; 2248 for (i = 0; i < args->count; i++) { 2249 /* Lowest order bit is reserved */ 2250 if (keys[i].zero) 2251 goto out; 2252 } 2253 2254 mc = kvm_s390_new_mmu_cache(); 2255 if (!mc) { 2256 r = -ENOMEM; 2257 goto out; 2258 } 2259 2260 r = 0; 2261 do { 2262 r = kvm_s390_mmu_cache_topup(mc); 2263 if (r == -ENOMEM) 2264 break; 2265 scoped_guard(read_lock, &kvm->mmu_lock) { 2266 for (i = 0 ; i < args->count; i++) { 2267 r = dat_set_storage_key(mc, kvm->arch.gmap->asce, 2268 args->start_gfn + i, keys[i], 0); 2269 if (r) 2270 break; 2271 } 2272 } 2273 } while (r == -ENOMEM); 2274 kvm_s390_free_mmu_cache(mc); 2275 out: 2276 kvfree(keys); 2277 return r; 2278 } 2279 2280 /* 2281 * This function searches for the next page with dirty CMMA attributes, and 2282 * saves the attributes in the buffer up to either the end of the buffer or 2283 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found; 2284 * no trailing clean bytes are saved. 2285 * In case no dirty bits were found, or if CMMA was not enabled or used, the 2286 * output buffer will indicate 0 as length. 2287 */ 2288 static int kvm_s390_get_cmma_bits(struct kvm *kvm, 2289 struct kvm_s390_cmma_log *args) 2290 { 2291 int peek, ret; 2292 u8 *values; 2293 2294 if (!kvm->arch.use_cmma) 2295 return -ENXIO; 2296 /* Invalid/unsupported flags were specified */ 2297 if (args->flags & ~KVM_S390_CMMA_PEEK) 2298 return -EINVAL; 2299 /* Migration mode query, and we are not doing a migration */ 2300 peek = !!(args->flags & KVM_S390_CMMA_PEEK); 2301 if (!peek && !kvm->arch.migration_mode) 2302 return -EINVAL; 2303 /* CMMA is disabled or was not used, or the buffer has length zero */ 2304 args->count = min(args->count, KVM_S390_CMMA_SIZE_MAX); 2305 if (!args->count || !uses_cmm(kvm->arch.gmap)) { 2306 memset(args, 0, sizeof(*args)); 2307 return 0; 2308 } 2309 /* We are not peeking, and there are no dirty pages */ 2310 if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) { 2311 memset(args, 0, sizeof(*args)); 2312 return 0; 2313 } 2314 2315 values = vzalloc(args->count); 2316 if (!values) 2317 return -ENOMEM; 2318 2319 scoped_guard(read_lock, &kvm->mmu_lock) { 2320 if (peek) 2321 ret = dat_peek_cmma(args->start_gfn, kvm->arch.gmap->asce, &args->count, 2322 values); 2323 else 2324 ret = dat_get_cmma(kvm->arch.gmap->asce, &args->start_gfn, &args->count, 2325 values, &kvm->arch.cmma_dirty_pages); 2326 } 2327 2328 if (kvm->arch.migration_mode) 2329 args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages); 2330 else 2331 args->remaining = 0; 2332 2333 if (copy_to_user((void __user *)args->values, values, args->count)) 2334 ret = -EFAULT; 2335 2336 vfree(values); 2337 return ret; 2338 } 2339 2340 /* 2341 * This function sets the CMMA attributes for the given pages. If the input 2342 * buffer has zero length, no action is taken, otherwise the attributes are 2343 * set and the mm->context.uses_cmm flag is set. 2344 */ 2345 static int kvm_s390_set_cmma_bits(struct kvm *kvm, 2346 const struct kvm_s390_cmma_log *args) 2347 { 2348 struct kvm_s390_mmu_cache *mc __free(kvm_s390_mmu_cache) = NULL; 2349 u8 *bits __free(kvfree) = NULL; 2350 int r = 0; 2351 2352 if (!kvm->arch.use_cmma) 2353 return -ENXIO; 2354 /* invalid/unsupported flags */ 2355 if (args->flags != 0) 2356 return -EINVAL; 2357 /* Enforce sane limit on memory allocation */ 2358 if (args->count > KVM_S390_CMMA_SIZE_MAX) 2359 return -EINVAL; 2360 /* Nothing to do */ 2361 if (args->count == 0) 2362 return 0; 2363 2364 mc = kvm_s390_new_mmu_cache(); 2365 if (!mc) 2366 return -ENOMEM; 2367 bits = vmalloc(array_size(sizeof(*bits), args->count)); 2368 if (!bits) 2369 return -ENOMEM; 2370 2371 r = copy_from_user(bits, (void __user *)args->values, args->count); 2372 if (r) 2373 return -EFAULT; 2374 2375 do { 2376 r = kvm_s390_mmu_cache_topup(mc); 2377 if (r) 2378 return r; 2379 scoped_guard(read_lock, &kvm->mmu_lock) { 2380 r = dat_set_cmma_bits(mc, kvm->arch.gmap->asce, args->start_gfn, 2381 args->count, args->mask, bits); 2382 } 2383 } while (r == -ENOMEM); 2384 2385 set_bit(GMAP_FLAG_USES_CMM, &kvm->arch.gmap->flags); 2386 2387 return r; 2388 } 2389 2390 /** 2391 * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to 2392 * non protected. 2393 * @kvm: the VM whose protected vCPUs are to be converted 2394 * @rc: return value for the RC field of the UVC (in case of error) 2395 * @rrc: return value for the RRC field of the UVC (in case of error) 2396 * 2397 * Does not stop in case of error, tries to convert as many 2398 * CPUs as possible. In case of error, the RC and RRC of the last error are 2399 * returned. 2400 * 2401 * Return: 0 in case of success, otherwise -EIO 2402 */ 2403 int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc) 2404 { 2405 struct kvm_vcpu *vcpu; 2406 unsigned long i; 2407 u16 _rc, _rrc; 2408 int ret = 0; 2409 2410 /* 2411 * We ignore failures and try to destroy as many CPUs as possible. 2412 * At the same time we must not free the assigned resources when 2413 * this fails, as the ultravisor has still access to that memory. 2414 * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak 2415 * behind. 2416 * We want to return the first failure rc and rrc, though. 2417 */ 2418 kvm_for_each_vcpu(i, vcpu, kvm) { 2419 mutex_lock(&vcpu->mutex); 2420 if (kvm_s390_pv_destroy_cpu(vcpu, &_rc, &_rrc) && !ret) { 2421 *rc = _rc; 2422 *rrc = _rrc; 2423 ret = -EIO; 2424 } 2425 mutex_unlock(&vcpu->mutex); 2426 } 2427 /* Ensure that we re-enable gisa if the non-PV guest used it but the PV guest did not. */ 2428 if (use_gisa) 2429 kvm_s390_gisa_enable(kvm); 2430 return ret; 2431 } 2432 2433 /** 2434 * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM 2435 * to protected. 2436 * @kvm: the VM whose protected vCPUs are to be converted 2437 * @rc: return value for the RC field of the UVC (in case of error) 2438 * @rrc: return value for the RRC field of the UVC (in case of error) 2439 * 2440 * Tries to undo the conversion in case of error. 2441 * 2442 * Return: 0 in case of success, otherwise -EIO 2443 */ 2444 static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc) 2445 { 2446 unsigned long i; 2447 int r = 0; 2448 u16 dummy; 2449 2450 struct kvm_vcpu *vcpu; 2451 2452 /* Disable the GISA if the ultravisor does not support AIV. */ 2453 if (!uv_has_feature(BIT_UV_FEAT_AIV)) 2454 kvm_s390_gisa_disable(kvm); 2455 2456 kvm_for_each_vcpu(i, vcpu, kvm) { 2457 mutex_lock(&vcpu->mutex); 2458 r = kvm_s390_pv_create_cpu(vcpu, rc, rrc); 2459 mutex_unlock(&vcpu->mutex); 2460 if (r) 2461 break; 2462 } 2463 if (r) 2464 kvm_s390_cpus_from_pv(kvm, &dummy, &dummy); 2465 return r; 2466 } 2467 2468 /* 2469 * Here we provide user space with a direct interface to query UV 2470 * related data like UV maxima and available features as well as 2471 * feature specific data. 2472 * 2473 * To facilitate future extension of the data structures we'll try to 2474 * write data up to the maximum requested length. 2475 */ 2476 static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info) 2477 { 2478 ssize_t len_min; 2479 2480 switch (info->header.id) { 2481 case KVM_PV_INFO_VM: { 2482 len_min = sizeof(info->header) + sizeof(info->vm); 2483 2484 if (info->header.len_max < len_min) 2485 return -EINVAL; 2486 2487 memcpy(info->vm.inst_calls_list, 2488 uv_info.inst_calls_list, 2489 sizeof(uv_info.inst_calls_list)); 2490 2491 /* It's max cpuid not max cpus, so it's off by one */ 2492 info->vm.max_cpus = uv_info.max_guest_cpu_id + 1; 2493 info->vm.max_guests = uv_info.max_num_sec_conf; 2494 info->vm.max_guest_addr = uv_info.max_sec_stor_addr; 2495 info->vm.feature_indication = uv_info.uv_feature_indications; 2496 2497 return len_min; 2498 } 2499 case KVM_PV_INFO_DUMP: { 2500 len_min = sizeof(info->header) + sizeof(info->dump); 2501 2502 if (info->header.len_max < len_min) 2503 return -EINVAL; 2504 2505 info->dump.dump_cpu_buffer_len = uv_info.guest_cpu_stor_len; 2506 info->dump.dump_config_mem_buffer_per_1m = uv_info.conf_dump_storage_state_len; 2507 info->dump.dump_config_finalize_len = uv_info.conf_dump_finalize_len; 2508 return len_min; 2509 } 2510 default: 2511 return -EINVAL; 2512 } 2513 } 2514 2515 static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd, 2516 struct kvm_s390_pv_dmp dmp) 2517 { 2518 int r = -EINVAL; 2519 void __user *result_buff = (void __user *)dmp.buff_addr; 2520 2521 switch (dmp.subcmd) { 2522 case KVM_PV_DUMP_INIT: { 2523 if (kvm->arch.pv.dumping) 2524 break; 2525 2526 /* 2527 * Block SIE entry as concurrent dump UVCs could lead 2528 * to validities. 2529 */ 2530 kvm_s390_vcpu_block_all(kvm); 2531 2532 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2533 UVC_CMD_DUMP_INIT, &cmd->rc, &cmd->rrc); 2534 KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP INIT: rc %x rrc %x", 2535 cmd->rc, cmd->rrc); 2536 if (!r) { 2537 kvm->arch.pv.dumping = true; 2538 } else { 2539 kvm_s390_vcpu_unblock_all(kvm); 2540 r = -EINVAL; 2541 } 2542 break; 2543 } 2544 case KVM_PV_DUMP_CONFIG_STOR_STATE: { 2545 if (!kvm->arch.pv.dumping) 2546 break; 2547 2548 /* 2549 * gaddr is an output parameter since we might stop 2550 * early. As dmp will be copied back in our caller, we 2551 * don't need to do it ourselves. 2552 */ 2553 r = kvm_s390_pv_dump_stor_state(kvm, result_buff, &dmp.gaddr, dmp.buff_len, 2554 &cmd->rc, &cmd->rrc); 2555 break; 2556 } 2557 case KVM_PV_DUMP_COMPLETE: { 2558 if (!kvm->arch.pv.dumping) 2559 break; 2560 2561 r = -EINVAL; 2562 if (dmp.buff_len < uv_info.conf_dump_finalize_len) 2563 break; 2564 2565 r = kvm_s390_pv_dump_complete(kvm, result_buff, 2566 &cmd->rc, &cmd->rrc); 2567 break; 2568 } 2569 default: 2570 r = -ENOTTY; 2571 break; 2572 } 2573 2574 return r; 2575 } 2576 2577 static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) 2578 { 2579 const bool need_lock = (cmd->cmd != KVM_PV_ASYNC_CLEANUP_PERFORM); 2580 void __user *argp = (void __user *)cmd->data; 2581 int r = 0; 2582 u16 dummy; 2583 2584 if (need_lock) 2585 mutex_lock(&kvm->lock); 2586 2587 switch (cmd->cmd) { 2588 case KVM_PV_ENABLE: { 2589 r = -EINVAL; 2590 if (kvm_s390_pv_is_protected(kvm)) 2591 break; 2592 2593 kvm_s390_unmap_all_adapters(kvm); 2594 mmap_write_lock(kvm->mm); 2595 /* 2596 * Disable creation of new THPs. Existing THPs can stay, they 2597 * will be split when any part of them gets imported. 2598 */ 2599 mm_flags_clear(MMF_DISABLE_THP_EXCEPT_ADVISED, kvm->mm); 2600 mm_flags_set(MMF_DISABLE_THP_COMPLETELY, kvm->mm); 2601 set_bit(GMAP_FLAG_EXPORT_ON_UNMAP, &kvm->arch.gmap->flags); 2602 r = gmap_helper_disable_cow_sharing(); 2603 mmap_write_unlock(kvm->mm); 2604 if (r) 2605 break; 2606 2607 r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc); 2608 if (r) 2609 break; 2610 2611 r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc); 2612 if (r) 2613 kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy); 2614 2615 /* we need to block service interrupts from now on */ 2616 set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); 2617 break; 2618 } 2619 case KVM_PV_ASYNC_CLEANUP_PREPARE: 2620 r = -EINVAL; 2621 if (!kvm_s390_pv_is_protected(kvm) || !async_destroy) 2622 break; 2623 2624 r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc); 2625 /* 2626 * If a CPU could not be destroyed, destroy VM will also fail. 2627 * There is no point in trying to destroy it. Instead return 2628 * the rc and rrc from the first CPU that failed destroying. 2629 */ 2630 if (r) 2631 break; 2632 r = kvm_s390_pv_set_aside(kvm, &cmd->rc, &cmd->rrc); 2633 2634 /* no need to block service interrupts any more */ 2635 clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); 2636 break; 2637 case KVM_PV_ASYNC_CLEANUP_PERFORM: 2638 r = -EINVAL; 2639 if (!async_destroy) 2640 break; 2641 /* kvm->lock must not be held; this is asserted inside the function. */ 2642 r = kvm_s390_pv_deinit_aside_vm(kvm, &cmd->rc, &cmd->rrc); 2643 break; 2644 case KVM_PV_DISABLE: { 2645 r = -EINVAL; 2646 if (!kvm_s390_pv_is_protected(kvm)) 2647 break; 2648 2649 r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc); 2650 /* 2651 * If a CPU could not be destroyed, destroy VM will also fail. 2652 * There is no point in trying to destroy it. Instead return 2653 * the rc and rrc from the first CPU that failed destroying. 2654 */ 2655 if (r) 2656 break; 2657 r = kvm_s390_pv_deinit_cleanup_all(kvm, &cmd->rc, &cmd->rrc); 2658 2659 /* no need to block service interrupts any more */ 2660 clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); 2661 break; 2662 } 2663 case KVM_PV_SET_SEC_PARMS: { 2664 struct kvm_s390_pv_sec_parm parms = {}; 2665 void *hdr; 2666 2667 r = -EINVAL; 2668 if (!kvm_s390_pv_is_protected(kvm)) 2669 break; 2670 2671 r = -EFAULT; 2672 if (copy_from_user(&parms, argp, sizeof(parms))) 2673 break; 2674 2675 /* Currently restricted to 1MiB */ 2676 r = -EINVAL; 2677 if (parms.length > SZ_1M) 2678 break; 2679 2680 r = -ENOMEM; 2681 hdr = vmalloc(parms.length); 2682 if (!hdr) 2683 break; 2684 2685 r = -EFAULT; 2686 if (!copy_from_user(hdr, (void __user *)parms.origin, 2687 parms.length)) 2688 r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length, 2689 &cmd->rc, &cmd->rrc); 2690 2691 vfree(hdr); 2692 break; 2693 } 2694 case KVM_PV_UNPACK: { 2695 struct kvm_s390_pv_unp unp = {}; 2696 2697 r = -EINVAL; 2698 if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm)) 2699 break; 2700 2701 r = -EFAULT; 2702 if (copy_from_user(&unp, argp, sizeof(unp))) 2703 break; 2704 2705 r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak, 2706 &cmd->rc, &cmd->rrc); 2707 break; 2708 } 2709 case KVM_PV_VERIFY: { 2710 r = -EINVAL; 2711 if (!kvm_s390_pv_is_protected(kvm)) 2712 break; 2713 2714 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2715 UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc); 2716 KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc, 2717 cmd->rrc); 2718 break; 2719 } 2720 case KVM_PV_PREP_RESET: { 2721 r = -EINVAL; 2722 if (!kvm_s390_pv_is_protected(kvm)) 2723 break; 2724 2725 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2726 UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc); 2727 KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x", 2728 cmd->rc, cmd->rrc); 2729 break; 2730 } 2731 case KVM_PV_UNSHARE_ALL: { 2732 r = -EINVAL; 2733 if (!kvm_s390_pv_is_protected(kvm)) 2734 break; 2735 2736 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2737 UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc); 2738 KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x", 2739 cmd->rc, cmd->rrc); 2740 break; 2741 } 2742 case KVM_PV_INFO: { 2743 struct kvm_s390_pv_info info = {}; 2744 ssize_t data_len; 2745 2746 /* 2747 * No need to check the VM protection here. 2748 * 2749 * Maybe user space wants to query some of the data 2750 * when the VM is still unprotected. If we see the 2751 * need to fence a new data command we can still 2752 * return an error in the info handler. 2753 */ 2754 2755 r = -EFAULT; 2756 if (copy_from_user(&info, argp, sizeof(info.header))) 2757 break; 2758 2759 r = -EINVAL; 2760 if (info.header.len_max < sizeof(info.header)) 2761 break; 2762 2763 data_len = kvm_s390_handle_pv_info(&info); 2764 if (data_len < 0) { 2765 r = data_len; 2766 break; 2767 } 2768 /* 2769 * If a data command struct is extended (multiple 2770 * times) this can be used to determine how much of it 2771 * is valid. 2772 */ 2773 info.header.len_written = data_len; 2774 2775 r = -EFAULT; 2776 if (copy_to_user(argp, &info, data_len)) 2777 break; 2778 2779 r = 0; 2780 break; 2781 } 2782 case KVM_PV_DUMP: { 2783 struct kvm_s390_pv_dmp dmp; 2784 2785 r = -EINVAL; 2786 if (!kvm_s390_pv_is_protected(kvm)) 2787 break; 2788 2789 r = -EFAULT; 2790 if (copy_from_user(&dmp, argp, sizeof(dmp))) 2791 break; 2792 2793 r = kvm_s390_pv_dmp(kvm, cmd, dmp); 2794 if (r) 2795 break; 2796 2797 if (copy_to_user(argp, &dmp, sizeof(dmp))) { 2798 r = -EFAULT; 2799 break; 2800 } 2801 2802 break; 2803 } 2804 default: 2805 r = -ENOTTY; 2806 } 2807 if (need_lock) 2808 mutex_unlock(&kvm->lock); 2809 2810 return r; 2811 } 2812 2813 static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_flags) 2814 { 2815 if (mop->flags & ~supported_flags || !mop->size) 2816 return -EINVAL; 2817 if (mop->size > MEM_OP_MAX_SIZE) 2818 return -E2BIG; 2819 if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) { 2820 if (mop->key > 0xf) 2821 return -EINVAL; 2822 } else { 2823 mop->key = 0; 2824 } 2825 return 0; 2826 } 2827 2828 static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop) 2829 { 2830 void __user *uaddr = (void __user *)mop->buf; 2831 void *tmpbuf __free(kvfree) = NULL; 2832 enum gacc_mode acc_mode; 2833 int r; 2834 2835 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION | 2836 KVM_S390_MEMOP_F_CHECK_ONLY); 2837 if (r) 2838 return r; 2839 2840 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 2841 tmpbuf = vmalloc(mop->size); 2842 if (!tmpbuf) 2843 return -ENOMEM; 2844 } 2845 2846 acc_mode = mop->op == KVM_S390_MEMOP_ABSOLUTE_READ ? GACC_FETCH : GACC_STORE; 2847 2848 scoped_guard(srcu, &kvm->srcu) { 2849 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) 2850 return check_gpa_range(kvm, mop->gaddr, mop->size, acc_mode, mop->key); 2851 2852 if (acc_mode == GACC_STORE && copy_from_user(tmpbuf, uaddr, mop->size)) 2853 return -EFAULT; 2854 r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, 2855 mop->size, acc_mode, mop->key); 2856 if (r) 2857 return r; 2858 if (acc_mode != GACC_STORE && copy_to_user(uaddr, tmpbuf, mop->size)) 2859 return -EFAULT; 2860 } 2861 return 0; 2862 } 2863 2864 static int kvm_s390_vm_mem_op_cmpxchg(struct kvm *kvm, struct kvm_s390_mem_op *mop) 2865 { 2866 void __user *uaddr = (void __user *)mop->buf; 2867 void __user *old_addr = (void __user *)mop->old_addr; 2868 union kvm_s390_quad old = { .sixteen = 0 }; 2869 union kvm_s390_quad new = { .sixteen = 0 }; 2870 bool success = false; 2871 int r; 2872 2873 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION); 2874 if (r) 2875 return r; 2876 /* 2877 * This validates off_in_quad. Checking that size is a power 2878 * of two is not necessary, as cmpxchg_guest_abs_with_key 2879 * takes care of that 2880 */ 2881 if (mop->size > sizeof(new)) 2882 return -EINVAL; 2883 if (copy_from_user(&new, uaddr, mop->size)) 2884 return -EFAULT; 2885 if (copy_from_user(&old, old_addr, mop->size)) 2886 return -EFAULT; 2887 2888 scoped_guard(srcu, &kvm->srcu) { 2889 r = cmpxchg_guest_abs_with_key(kvm, mop->gaddr, mop->size, &old, new, 2890 mop->key, &success); 2891 2892 if (!success && copy_to_user(old_addr, &old, mop->size)) 2893 return -EFAULT; 2894 } 2895 return r; 2896 } 2897 2898 static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop) 2899 { 2900 /* 2901 * This is technically a heuristic only, if the kvm->lock is not 2902 * taken, it is not guaranteed that the vm is/remains non-protected. 2903 * This is ok from a kernel perspective, wrongdoing is detected 2904 * on the access, -EFAULT is returned and the vm may crash the 2905 * next time it accesses the memory in question. 2906 * There is no sane usecase to do switching and a memop on two 2907 * different CPUs at the same time. 2908 */ 2909 if (kvm_s390_pv_get_handle(kvm)) 2910 return -EINVAL; 2911 2912 switch (mop->op) { 2913 case KVM_S390_MEMOP_ABSOLUTE_READ: 2914 case KVM_S390_MEMOP_ABSOLUTE_WRITE: 2915 return kvm_s390_vm_mem_op_abs(kvm, mop); 2916 case KVM_S390_MEMOP_ABSOLUTE_CMPXCHG: 2917 return kvm_s390_vm_mem_op_cmpxchg(kvm, mop); 2918 default: 2919 return -EINVAL; 2920 } 2921 } 2922 2923 int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) 2924 { 2925 struct kvm *kvm = filp->private_data; 2926 void __user *argp = (void __user *)arg; 2927 struct kvm_device_attr attr; 2928 int r; 2929 struct kvm_s390_interrupt_info *inti; 2930 2931 switch (ioctl) { 2932 case KVM_S390_INTERRUPT: { 2933 struct kvm_s390_interrupt s390int; 2934 2935 r = -EFAULT; 2936 if (copy_from_user(&s390int, argp, sizeof(s390int))) 2937 break; 2938 inti = kzalloc_obj(*inti, GFP_KERNEL_ACCOUNT); 2939 if (!inti) 2940 return -ENOMEM; 2941 r = kvm_s390_inject_vm(kvm, &s390int, inti); 2942 if (r) 2943 kfree(inti); 2944 break; 2945 } 2946 case KVM_CREATE_IRQCHIP: { 2947 r = -EINVAL; 2948 if (kvm->arch.use_irqchip) 2949 r = 0; 2950 break; 2951 } 2952 case KVM_SET_DEVICE_ATTR: { 2953 r = -EFAULT; 2954 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2955 break; 2956 r = kvm_s390_vm_set_attr(kvm, &attr); 2957 break; 2958 } 2959 case KVM_GET_DEVICE_ATTR: { 2960 r = -EFAULT; 2961 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2962 break; 2963 r = kvm_s390_vm_get_attr(kvm, &attr); 2964 break; 2965 } 2966 case KVM_HAS_DEVICE_ATTR: { 2967 r = -EFAULT; 2968 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 2969 break; 2970 r = kvm_s390_vm_has_attr(kvm, &attr); 2971 break; 2972 } 2973 case KVM_S390_GET_SKEYS: { 2974 struct kvm_s390_skeys args; 2975 2976 r = -EFAULT; 2977 if (copy_from_user(&args, argp, 2978 sizeof(struct kvm_s390_skeys))) 2979 break; 2980 r = kvm_s390_get_skeys(kvm, &args); 2981 break; 2982 } 2983 case KVM_S390_SET_SKEYS: { 2984 struct kvm_s390_skeys args; 2985 2986 r = -EFAULT; 2987 if (copy_from_user(&args, argp, 2988 sizeof(struct kvm_s390_skeys))) 2989 break; 2990 r = kvm_s390_set_skeys(kvm, &args); 2991 break; 2992 } 2993 case KVM_S390_GET_CMMA_BITS: { 2994 struct kvm_s390_cmma_log args; 2995 2996 r = -EFAULT; 2997 if (copy_from_user(&args, argp, sizeof(args))) 2998 break; 2999 mutex_lock(&kvm->slots_lock); 3000 r = kvm_s390_get_cmma_bits(kvm, &args); 3001 mutex_unlock(&kvm->slots_lock); 3002 if (!r) { 3003 r = copy_to_user(argp, &args, sizeof(args)); 3004 if (r) 3005 r = -EFAULT; 3006 } 3007 break; 3008 } 3009 case KVM_S390_SET_CMMA_BITS: { 3010 struct kvm_s390_cmma_log args; 3011 3012 r = -EFAULT; 3013 if (copy_from_user(&args, argp, sizeof(args))) 3014 break; 3015 mutex_lock(&kvm->slots_lock); 3016 r = kvm_s390_set_cmma_bits(kvm, &args); 3017 mutex_unlock(&kvm->slots_lock); 3018 break; 3019 } 3020 case KVM_S390_PV_COMMAND: { 3021 struct kvm_pv_cmd args; 3022 3023 /* protvirt means user cpu state */ 3024 kvm_s390_set_user_cpu_state_ctrl(kvm); 3025 r = 0; 3026 if (!is_prot_virt_host()) { 3027 r = -EINVAL; 3028 break; 3029 } 3030 if (copy_from_user(&args, argp, sizeof(args))) { 3031 r = -EFAULT; 3032 break; 3033 } 3034 if (args.flags) { 3035 r = -EINVAL; 3036 break; 3037 } 3038 /* must be called without kvm->lock */ 3039 r = kvm_s390_handle_pv(kvm, &args); 3040 if (copy_to_user(argp, &args, sizeof(args))) { 3041 r = -EFAULT; 3042 break; 3043 } 3044 break; 3045 } 3046 case KVM_S390_MEM_OP: { 3047 struct kvm_s390_mem_op mem_op; 3048 3049 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 3050 r = kvm_s390_vm_mem_op(kvm, &mem_op); 3051 else 3052 r = -EFAULT; 3053 break; 3054 } 3055 case KVM_S390_KEYOP: { 3056 struct kvm_s390_mmu_cache *mc; 3057 struct kvm_s390_keyop kop; 3058 union skey skey; 3059 3060 if (copy_from_user(&kop, argp, sizeof(kop))) { 3061 r = -EFAULT; 3062 break; 3063 } 3064 skey.skey = kop.key; 3065 3066 mc = kvm_s390_new_mmu_cache(); 3067 if (!mc) 3068 return -ENOMEM; 3069 3070 r = kvm_s390_keyop(mc, kvm, kop.operation, kop.guest_addr, skey); 3071 kvm_s390_free_mmu_cache(mc); 3072 if (r < 0) 3073 break; 3074 3075 kop.key = r; 3076 r = 0; 3077 if (copy_to_user(argp, &kop, sizeof(kop))) 3078 r = -EFAULT; 3079 break; 3080 } 3081 case KVM_S390_ZPCI_OP: { 3082 struct kvm_s390_zpci_op args; 3083 3084 r = -EINVAL; 3085 if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 3086 break; 3087 if (copy_from_user(&args, argp, sizeof(args))) { 3088 r = -EFAULT; 3089 break; 3090 } 3091 r = kvm_s390_pci_zpci_op(kvm, &args); 3092 break; 3093 } 3094 default: 3095 r = -ENOTTY; 3096 } 3097 3098 return r; 3099 } 3100 3101 static int kvm_s390_apxa_installed(void) 3102 { 3103 struct ap_config_info info; 3104 3105 if (ap_instructions_available()) { 3106 if (ap_qci(&info) == 0) 3107 return info.apxa; 3108 } 3109 3110 return 0; 3111 } 3112 3113 /* 3114 * The format of the crypto control block (CRYCB) is specified in the 3 low 3115 * order bits of the CRYCB designation (CRYCBD) field as follows: 3116 * Format 0: Neither the message security assist extension 3 (MSAX3) nor the 3117 * AP extended addressing (APXA) facility are installed. 3118 * Format 1: The APXA facility is not installed but the MSAX3 facility is. 3119 * Format 2: Both the APXA and MSAX3 facilities are installed 3120 */ 3121 static void kvm_s390_set_crycb_format(struct kvm *kvm) 3122 { 3123 kvm->arch.crypto.crycbd = virt_to_phys(kvm->arch.crypto.crycb); 3124 3125 /* Clear the CRYCB format bits - i.e., set format 0 by default */ 3126 kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK); 3127 3128 /* Check whether MSAX3 is installed */ 3129 if (!test_kvm_facility(kvm, 76)) 3130 return; 3131 3132 if (kvm_s390_apxa_installed()) 3133 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2; 3134 else 3135 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1; 3136 } 3137 3138 /* 3139 * kvm_arch_crypto_set_masks 3140 * 3141 * @kvm: pointer to the target guest's KVM struct containing the crypto masks 3142 * to be set. 3143 * @apm: the mask identifying the accessible AP adapters 3144 * @aqm: the mask identifying the accessible AP domains 3145 * @adm: the mask identifying the accessible AP control domains 3146 * 3147 * Set the masks that identify the adapters, domains and control domains to 3148 * which the KVM guest is granted access. 3149 * 3150 * Note: The kvm->lock mutex must be locked by the caller before invoking this 3151 * function. 3152 */ 3153 void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm, 3154 unsigned long *aqm, unsigned long *adm) 3155 { 3156 struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb; 3157 3158 kvm_s390_vcpu_block_all(kvm); 3159 3160 switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) { 3161 case CRYCB_FORMAT2: /* APCB1 use 256 bits */ 3162 memcpy(crycb->apcb1.apm, apm, 32); 3163 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx", 3164 apm[0], apm[1], apm[2], apm[3]); 3165 memcpy(crycb->apcb1.aqm, aqm, 32); 3166 VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx", 3167 aqm[0], aqm[1], aqm[2], aqm[3]); 3168 memcpy(crycb->apcb1.adm, adm, 32); 3169 VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx", 3170 adm[0], adm[1], adm[2], adm[3]); 3171 break; 3172 case CRYCB_FORMAT1: 3173 case CRYCB_FORMAT0: /* Fall through both use APCB0 */ 3174 memcpy(crycb->apcb0.apm, apm, 8); 3175 memcpy(crycb->apcb0.aqm, aqm, 2); 3176 memcpy(crycb->apcb0.adm, adm, 2); 3177 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x", 3178 apm[0], *((unsigned short *)aqm), 3179 *((unsigned short *)adm)); 3180 break; 3181 default: /* Can not happen */ 3182 break; 3183 } 3184 3185 /* recreate the shadow crycb for each vcpu */ 3186 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 3187 kvm_s390_vcpu_unblock_all(kvm); 3188 } 3189 EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks); 3190 3191 /* 3192 * kvm_arch_crypto_clear_masks 3193 * 3194 * @kvm: pointer to the target guest's KVM struct containing the crypto masks 3195 * to be cleared. 3196 * 3197 * Clear the masks that identify the adapters, domains and control domains to 3198 * which the KVM guest is granted access. 3199 * 3200 * Note: The kvm->lock mutex must be locked by the caller before invoking this 3201 * function. 3202 */ 3203 void kvm_arch_crypto_clear_masks(struct kvm *kvm) 3204 { 3205 kvm_s390_vcpu_block_all(kvm); 3206 3207 memset(&kvm->arch.crypto.crycb->apcb0, 0, 3208 sizeof(kvm->arch.crypto.crycb->apcb0)); 3209 memset(&kvm->arch.crypto.crycb->apcb1, 0, 3210 sizeof(kvm->arch.crypto.crycb->apcb1)); 3211 3212 VM_EVENT(kvm, 3, "%s", "CLR CRYCB:"); 3213 /* recreate the shadow crycb for each vcpu */ 3214 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 3215 kvm_s390_vcpu_unblock_all(kvm); 3216 } 3217 EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks); 3218 3219 static u64 kvm_s390_get_initial_cpuid(void) 3220 { 3221 struct cpuid cpuid; 3222 3223 get_cpu_id(&cpuid); 3224 cpuid.version = 0xff; 3225 return *((u64 *) &cpuid); 3226 } 3227 3228 static void kvm_s390_crypto_init(struct kvm *kvm) 3229 { 3230 kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb; 3231 kvm_s390_set_crycb_format(kvm); 3232 init_rwsem(&kvm->arch.crypto.pqap_hook_rwsem); 3233 3234 if (!test_kvm_facility(kvm, 76)) 3235 return; 3236 3237 /* Enable AES/DEA protected key functions by default */ 3238 kvm->arch.crypto.aes_kw = 1; 3239 kvm->arch.crypto.dea_kw = 1; 3240 get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 3241 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 3242 get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 3243 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 3244 } 3245 3246 static void sca_dispose(struct kvm *kvm) 3247 { 3248 free_pages_exact(kvm->arch.sca, sizeof(*kvm->arch.sca)); 3249 kvm->arch.sca = NULL; 3250 } 3251 3252 void kvm_arch_free_vm(struct kvm *kvm) 3253 { 3254 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 3255 kvm_s390_pci_clear_list(kvm); 3256 3257 __kvm_arch_free_vm(kvm); 3258 } 3259 3260 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 3261 { 3262 gfp_t alloc_flags = GFP_KERNEL_ACCOUNT | __GFP_ZERO; 3263 char debug_name[16]; 3264 int i, rc; 3265 3266 mutex_init(&kvm->arch.pv.import_lock); 3267 3268 rc = -EINVAL; 3269 #ifdef CONFIG_KVM_S390_UCONTROL 3270 if (type & ~KVM_VM_S390_UCONTROL) 3271 goto out_err; 3272 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) 3273 goto out_err; 3274 #else 3275 if (type) 3276 goto out_err; 3277 #endif 3278 rc = -ENOMEM; 3279 3280 if (!sclp.has_64bscao) 3281 alloc_flags |= GFP_DMA; 3282 mutex_lock(&kvm_lock); 3283 3284 kvm->arch.sca = alloc_pages_exact(sizeof(*kvm->arch.sca), alloc_flags); 3285 mutex_unlock(&kvm_lock); 3286 if (!kvm->arch.sca) 3287 goto out_err; 3288 3289 snprintf(debug_name, sizeof(debug_name), "kvm-%u", current->pid); 3290 3291 kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long)); 3292 if (!kvm->arch.dbf) 3293 goto out_err; 3294 3295 BUILD_BUG_ON(sizeof(struct sie_page2) != 4096); 3296 kvm->arch.sie_page2 = 3297 (struct sie_page2 *) get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA); 3298 if (!kvm->arch.sie_page2) 3299 goto out_err; 3300 3301 kvm->arch.sie_page2->kvm = kvm; 3302 kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list; 3303 3304 for (i = 0; i < ARRAY_SIZE(kvm_s390_fac_base); i++) { 3305 kvm->arch.model.fac_mask[i] = stfle_fac_list[i] & 3306 kvm_s390_fac_base[i]; 3307 kvm->arch.model.fac_list[i] = stfle_fac_list[i] & 3308 kvm_s390_fac_base[i]; 3309 } 3310 for (i = 0; i < ARRAY_SIZE(kvm_s390_fac_ext); i++) { 3311 kvm->arch.model.fac_mask[i] |= stfle_fac_list[i] & 3312 kvm_s390_fac_ext[i]; 3313 } 3314 kvm->arch.model.subfuncs = kvm_s390_available_subfunc; 3315 3316 /* we are always in czam mode - even on pre z14 machines */ 3317 set_kvm_facility(kvm->arch.model.fac_mask, 138); 3318 set_kvm_facility(kvm->arch.model.fac_list, 138); 3319 /* we emulate STHYI in kvm */ 3320 set_kvm_facility(kvm->arch.model.fac_mask, 74); 3321 set_kvm_facility(kvm->arch.model.fac_list, 74); 3322 if (machine_has_tlb_guest()) { 3323 set_kvm_facility(kvm->arch.model.fac_mask, 147); 3324 set_kvm_facility(kvm->arch.model.fac_list, 147); 3325 } 3326 3327 if (css_general_characteristics.aiv && test_facility(65)) 3328 set_kvm_facility(kvm->arch.model.fac_mask, 65); 3329 3330 kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid(); 3331 kvm->arch.model.ibc = sclp.ibc & 0x0fff; 3332 3333 kvm->arch.model.uv_feat_guest.feat = 0; 3334 3335 kvm_s390_crypto_init(kvm); 3336 3337 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) { 3338 mutex_lock(&kvm->lock); 3339 kvm_s390_pci_init_list(kvm); 3340 kvm_s390_vcpu_pci_enable_interp(kvm); 3341 mutex_unlock(&kvm->lock); 3342 } 3343 3344 spin_lock_init(&kvm->arch.float_int.ais_lock); 3345 spin_lock_init(&kvm->arch.float_int.lock); 3346 for (i = 0; i < FIRQ_LIST_COUNT; i++) 3347 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]); 3348 init_waitqueue_head(&kvm->arch.ipte_wq); 3349 mutex_init(&kvm->arch.ipte_mutex); 3350 3351 debug_register_view(kvm->arch.dbf, &debug_sprintf_view); 3352 VM_EVENT(kvm, 3, "vm created with type %lu", type); 3353 3354 kvm->arch.mem_limit = type & KVM_VM_S390_UCONTROL ? KVM_S390_NO_MEM_LIMIT : sclp.hamax + 1; 3355 kvm->arch.gmap = gmap_new(kvm, gpa_to_gfn(kvm->arch.mem_limit)); 3356 if (!kvm->arch.gmap) 3357 goto out_err; 3358 clear_bit(GMAP_FLAG_PFAULT_ENABLED, &kvm->arch.gmap->flags); 3359 3360 if (type & KVM_VM_S390_UCONTROL) { 3361 struct kvm_userspace_memory_region2 fake_memslot = { 3362 .slot = KVM_S390_UCONTROL_MEMSLOT, 3363 .guest_phys_addr = 0, 3364 .userspace_addr = 0, 3365 .memory_size = ALIGN_DOWN(TASK_SIZE, _SEGMENT_SIZE), 3366 .flags = 0, 3367 }; 3368 3369 /* one flat fake memslot covering the whole address-space */ 3370 mutex_lock(&kvm->slots_lock); 3371 KVM_BUG_ON(kvm_set_internal_memslot(kvm, &fake_memslot), kvm); 3372 mutex_unlock(&kvm->slots_lock); 3373 set_bit(GMAP_FLAG_IS_UCONTROL, &kvm->arch.gmap->flags); 3374 } else { 3375 struct crst_table *table = dereference_asce(kvm->arch.gmap->asce); 3376 3377 crst_table_init((void *)table, _CRSTE_HOLE(table->crstes[0].h.tt).val); 3378 } 3379 3380 kvm->arch.use_pfmfi = sclp.has_pfmfi; 3381 kvm->arch.use_skf = sclp.has_skey; 3382 spin_lock_init(&kvm->arch.start_stop_lock); 3383 kvm_s390_vsie_init(kvm); 3384 if (use_gisa) 3385 kvm_s390_gisa_init(kvm); 3386 INIT_LIST_HEAD(&kvm->arch.pv.need_cleanup); 3387 kvm->arch.pv.set_aside = NULL; 3388 KVM_EVENT(3, "vm 0x%p created by pid %u", kvm, current->pid); 3389 3390 return 0; 3391 out_err: 3392 free_page((unsigned long)kvm->arch.sie_page2); 3393 debug_unregister(kvm->arch.dbf); 3394 sca_dispose(kvm); 3395 KVM_EVENT(3, "creation of vm failed: %d", rc); 3396 return rc; 3397 } 3398 3399 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 3400 { 3401 u16 rc, rrc; 3402 3403 VCPU_EVENT(vcpu, 3, "%s", "free cpu"); 3404 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); 3405 kvm_s390_clear_local_irqs(vcpu); 3406 kvm_clear_async_pf_completion_queue(vcpu); 3407 if (!kvm_is_ucontrol(vcpu->kvm)) 3408 sca_del_vcpu(vcpu); 3409 kvm_s390_update_topology_change_report(vcpu->kvm, 1); 3410 3411 if (kvm_is_ucontrol(vcpu->kvm)) { 3412 scoped_guard(spinlock, &vcpu->kvm->arch.gmap->children_lock) 3413 gmap_remove_child(vcpu->arch.gmap); 3414 vcpu->arch.gmap = gmap_put(vcpu->arch.gmap); 3415 } 3416 3417 if (vcpu->kvm->arch.use_cmma) 3418 kvm_s390_vcpu_unsetup_cmma(vcpu); 3419 /* We can not hold the vcpu mutex here, we are already dying */ 3420 if (kvm_s390_pv_cpu_get_handle(vcpu)) 3421 kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc); 3422 free_page((unsigned long)(vcpu->arch.sie_block)); 3423 kvm_s390_free_mmu_cache(vcpu->arch.mc); 3424 } 3425 3426 void kvm_arch_destroy_vm(struct kvm *kvm) 3427 { 3428 u16 rc, rrc; 3429 3430 kvm_destroy_vcpus(kvm); 3431 sca_dispose(kvm); 3432 kvm_s390_gisa_destroy(kvm); 3433 /* 3434 * We are already at the end of life and kvm->lock is not taken. 3435 * This is ok as the file descriptor is closed by now and nobody 3436 * can mess with the pv state. 3437 */ 3438 kvm_s390_pv_deinit_cleanup_all(kvm, &rc, &rrc); 3439 /* 3440 * Remove the mmu notifier only when the whole KVM VM is torn down, 3441 * and only if one was registered to begin with. If the VM is 3442 * currently not protected, but has been previously been protected, 3443 * then it's possible that the notifier is still registered. 3444 */ 3445 if (kvm->arch.pv.mmu_notifier.ops) 3446 mmu_notifier_unregister(&kvm->arch.pv.mmu_notifier, kvm->mm); 3447 3448 debug_unregister(kvm->arch.dbf); 3449 free_page((unsigned long)kvm->arch.sie_page2); 3450 kvm_s390_destroy_adapters(kvm); 3451 kvm_s390_clear_float_irqs(kvm); 3452 kvm_s390_vsie_destroy(kvm); 3453 kvm->arch.gmap = gmap_put(kvm->arch.gmap); 3454 KVM_EVENT(3, "vm 0x%p destroyed", kvm); 3455 } 3456 3457 /* Section: vcpu related */ 3458 static void sca_del_vcpu(struct kvm_vcpu *vcpu) 3459 { 3460 struct esca_block *sca = vcpu->kvm->arch.sca; 3461 3462 if (!kvm_s390_use_sca_entries()) 3463 return; 3464 3465 clear_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn); 3466 sca->cpu[vcpu->vcpu_id].sda = 0; 3467 } 3468 3469 static void sca_add_vcpu(struct kvm_vcpu *vcpu) 3470 { 3471 struct esca_block *sca = vcpu->kvm->arch.sca; 3472 phys_addr_t sca_phys = virt_to_phys(sca); 3473 3474 /* we still need the sca header for the ipte control */ 3475 vcpu->arch.sie_block->scaoh = sca_phys >> 32; 3476 vcpu->arch.sie_block->scaol = sca_phys & ESCA_SCAOL_MASK; 3477 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; 3478 3479 if (!kvm_s390_use_sca_entries()) 3480 return; 3481 3482 set_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn); 3483 sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block); 3484 } 3485 3486 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id) 3487 { 3488 if (!kvm_s390_use_sca_entries()) 3489 return id < KVM_MAX_VCPUS; 3490 3491 return id < KVM_S390_ESCA_CPU_SLOTS; 3492 } 3493 3494 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3495 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3496 { 3497 WARN_ON_ONCE(vcpu->arch.cputm_start != 0); 3498 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 3499 vcpu->arch.cputm_start = get_tod_clock_fast(); 3500 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 3501 } 3502 3503 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3504 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3505 { 3506 WARN_ON_ONCE(vcpu->arch.cputm_start == 0); 3507 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 3508 vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start; 3509 vcpu->arch.cputm_start = 0; 3510 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 3511 } 3512 3513 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3514 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3515 { 3516 WARN_ON_ONCE(vcpu->arch.cputm_enabled); 3517 vcpu->arch.cputm_enabled = true; 3518 __start_cpu_timer_accounting(vcpu); 3519 } 3520 3521 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3522 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3523 { 3524 WARN_ON_ONCE(!vcpu->arch.cputm_enabled); 3525 __stop_cpu_timer_accounting(vcpu); 3526 vcpu->arch.cputm_enabled = false; 3527 } 3528 3529 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3530 { 3531 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3532 __enable_cpu_timer_accounting(vcpu); 3533 preempt_enable(); 3534 } 3535 3536 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3537 { 3538 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3539 __disable_cpu_timer_accounting(vcpu); 3540 preempt_enable(); 3541 } 3542 3543 /* set the cpu timer - may only be called from the VCPU thread itself */ 3544 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm) 3545 { 3546 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3547 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 3548 if (vcpu->arch.cputm_enabled) 3549 vcpu->arch.cputm_start = get_tod_clock_fast(); 3550 vcpu->arch.sie_block->cputm = cputm; 3551 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 3552 preempt_enable(); 3553 } 3554 3555 /* update and get the cpu timer - can also be called from other VCPU threads */ 3556 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu) 3557 { 3558 unsigned int seq; 3559 __u64 value; 3560 3561 if (unlikely(!vcpu->arch.cputm_enabled)) 3562 return vcpu->arch.sie_block->cputm; 3563 3564 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3565 do { 3566 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount); 3567 /* 3568 * If the writer would ever execute a read in the critical 3569 * section, e.g. in irq context, we have a deadlock. 3570 */ 3571 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu); 3572 value = vcpu->arch.sie_block->cputm; 3573 /* if cputm_start is 0, accounting is being started/stopped */ 3574 if (likely(vcpu->arch.cputm_start)) 3575 value -= get_tod_clock_fast() - vcpu->arch.cputm_start; 3576 } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1)); 3577 preempt_enable(); 3578 return value; 3579 } 3580 3581 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 3582 { 3583 3584 kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING); 3585 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 3586 __start_cpu_timer_accounting(vcpu); 3587 vcpu->cpu = cpu; 3588 } 3589 3590 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 3591 { 3592 vcpu->cpu = -1; 3593 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 3594 __stop_cpu_timer_accounting(vcpu); 3595 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING); 3596 3597 } 3598 3599 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 3600 { 3601 mutex_lock(&vcpu->kvm->lock); 3602 preempt_disable(); 3603 vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; 3604 vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx; 3605 preempt_enable(); 3606 mutex_unlock(&vcpu->kvm->lock); 3607 if (!kvm_is_ucontrol(vcpu->kvm)) { 3608 vcpu->arch.gmap = vcpu->kvm->arch.gmap; 3609 sca_add_vcpu(vcpu); 3610 } 3611 if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0 || 3612 vcpu->kvm->arch.user_operexec) 3613 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 3614 } 3615 3616 static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr) 3617 { 3618 if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) && 3619 test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo)) 3620 return true; 3621 return false; 3622 } 3623 3624 static bool kvm_has_pckmo_ecc(struct kvm *kvm) 3625 { 3626 /* At least one ECC subfunction must be present */ 3627 return kvm_has_pckmo_subfunc(kvm, 32) || 3628 kvm_has_pckmo_subfunc(kvm, 33) || 3629 kvm_has_pckmo_subfunc(kvm, 34) || 3630 kvm_has_pckmo_subfunc(kvm, 40) || 3631 kvm_has_pckmo_subfunc(kvm, 41); 3632 3633 } 3634 3635 static bool kvm_has_pckmo_hmac(struct kvm *kvm) 3636 { 3637 /* At least one HMAC subfunction must be present */ 3638 return kvm_has_pckmo_subfunc(kvm, 118) || 3639 kvm_has_pckmo_subfunc(kvm, 122); 3640 } 3641 3642 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) 3643 { 3644 /* 3645 * If the AP instructions are not being interpreted and the MSAX3 3646 * facility is not configured for the guest, there is nothing to set up. 3647 */ 3648 if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76)) 3649 return; 3650 3651 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; 3652 vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); 3653 vcpu->arch.sie_block->eca &= ~ECA_APIE; 3654 vcpu->arch.sie_block->ecd &= ~(ECD_ECC | ECD_HMAC); 3655 3656 if (vcpu->kvm->arch.crypto.apie) 3657 vcpu->arch.sie_block->eca |= ECA_APIE; 3658 3659 /* Set up protected key support */ 3660 if (vcpu->kvm->arch.crypto.aes_kw) { 3661 vcpu->arch.sie_block->ecb3 |= ECB3_AES; 3662 /* ecc/hmac is also wrapped with AES key */ 3663 if (kvm_has_pckmo_ecc(vcpu->kvm)) 3664 vcpu->arch.sie_block->ecd |= ECD_ECC; 3665 if (kvm_has_pckmo_hmac(vcpu->kvm)) 3666 vcpu->arch.sie_block->ecd |= ECD_HMAC; 3667 } 3668 3669 if (vcpu->kvm->arch.crypto.dea_kw) 3670 vcpu->arch.sie_block->ecb3 |= ECB3_DEA; 3671 } 3672 3673 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) 3674 { 3675 free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo)); 3676 vcpu->arch.sie_block->cbrlo = 0; 3677 } 3678 3679 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) 3680 { 3681 void *cbrlo_page = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); 3682 3683 if (!cbrlo_page) 3684 return -ENOMEM; 3685 3686 vcpu->arch.sie_block->cbrlo = virt_to_phys(cbrlo_page); 3687 return 0; 3688 } 3689 3690 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu) 3691 { 3692 struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model; 3693 3694 vcpu->arch.sie_block->ibc = model->ibc; 3695 if (test_kvm_facility(vcpu->kvm, 7)) 3696 vcpu->arch.sie_block->fac = virt_to_phys(model->fac_list); 3697 } 3698 3699 static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu) 3700 { 3701 int rc = 0; 3702 u16 uvrc, uvrrc; 3703 3704 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | 3705 CPUSTAT_SM | 3706 CPUSTAT_STOPPED); 3707 3708 if (test_kvm_facility(vcpu->kvm, 78)) 3709 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2); 3710 else if (test_kvm_facility(vcpu->kvm, 8)) 3711 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED); 3712 3713 kvm_s390_vcpu_setup_model(vcpu); 3714 3715 /* pgste_set_pte has special handling for !machine_has_esop() */ 3716 if (machine_has_esop()) 3717 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT; 3718 if (test_kvm_facility(vcpu->kvm, 9)) 3719 vcpu->arch.sie_block->ecb |= ECB_SRSI; 3720 if (test_kvm_facility(vcpu->kvm, 11)) 3721 vcpu->arch.sie_block->ecb |= ECB_PTF; 3722 if (test_kvm_facility(vcpu->kvm, 73)) 3723 vcpu->arch.sie_block->ecb |= ECB_TE; 3724 if (!kvm_is_ucontrol(vcpu->kvm)) 3725 vcpu->arch.sie_block->ecb |= ECB_SPECI; 3726 3727 if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi) 3728 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI; 3729 if (test_kvm_facility(vcpu->kvm, 130)) 3730 vcpu->arch.sie_block->ecb2 |= ECB2_IEP; 3731 vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI; 3732 if (sclp.has_cei) 3733 vcpu->arch.sie_block->eca |= ECA_CEI; 3734 if (sclp.has_ib) 3735 vcpu->arch.sie_block->eca |= ECA_IB; 3736 if (sclp.has_siif) 3737 vcpu->arch.sie_block->eca |= ECA_SII; 3738 if (kvm_s390_use_sca_entries()) 3739 vcpu->arch.sie_block->eca |= ECA_SIGPI; 3740 if (test_kvm_facility(vcpu->kvm, 129)) { 3741 vcpu->arch.sie_block->eca |= ECA_VX; 3742 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 3743 } 3744 if (test_kvm_facility(vcpu->kvm, 139)) 3745 vcpu->arch.sie_block->ecd |= ECD_MEF; 3746 if (test_kvm_facility(vcpu->kvm, 156)) 3747 vcpu->arch.sie_block->ecd |= ECD_ETOKENF; 3748 if (vcpu->arch.sie_block->gd) { 3749 vcpu->arch.sie_block->eca |= ECA_AIV; 3750 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u", 3751 vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id); 3752 } 3753 vcpu->arch.sie_block->sdnxo = virt_to_phys(&vcpu->run->s.regs.sdnx) | SDNXC; 3754 vcpu->arch.sie_block->riccbd = virt_to_phys(&vcpu->run->s.regs.riccb); 3755 3756 if (sclp.has_kss) 3757 kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS); 3758 else 3759 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 3760 3761 if (vcpu->kvm->arch.use_cmma) { 3762 rc = kvm_s390_vcpu_setup_cmma(vcpu); 3763 if (rc) 3764 return rc; 3765 } 3766 hrtimer_setup(&vcpu->arch.ckc_timer, kvm_s390_idle_wakeup, CLOCK_MONOTONIC, 3767 HRTIMER_MODE_REL); 3768 3769 vcpu->arch.sie_block->hpid = HPID_KVM; 3770 3771 kvm_s390_vcpu_crypto_setup(vcpu); 3772 3773 kvm_s390_vcpu_pci_setup(vcpu); 3774 3775 mutex_lock(&vcpu->kvm->lock); 3776 if (kvm_s390_pv_is_protected(vcpu->kvm)) { 3777 rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc); 3778 if (rc) 3779 kvm_s390_vcpu_unsetup_cmma(vcpu); 3780 } 3781 mutex_unlock(&vcpu->kvm->lock); 3782 3783 return rc; 3784 } 3785 3786 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) 3787 { 3788 if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id)) 3789 return -EINVAL; 3790 return 0; 3791 } 3792 3793 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) 3794 { 3795 struct sie_page *sie_page; 3796 int rc; 3797 3798 BUILD_BUG_ON(sizeof(struct sie_page) != 4096); 3799 vcpu->arch.mc = kvm_s390_new_mmu_cache(); 3800 if (!vcpu->arch.mc) 3801 return -ENOMEM; 3802 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT); 3803 if (!sie_page) { 3804 kvm_s390_free_mmu_cache(vcpu->arch.mc); 3805 vcpu->arch.mc = NULL; 3806 return -ENOMEM; 3807 } 3808 3809 vcpu->arch.sie_block = &sie_page->sie_block; 3810 vcpu->arch.sie_block->itdba = virt_to_phys(&sie_page->itdb); 3811 3812 /* the real guest size will always be smaller than msl */ 3813 vcpu->arch.sie_block->mso = 0; 3814 vcpu->arch.sie_block->msl = sclp.hamax; 3815 3816 vcpu->arch.sie_block->icpua = vcpu->vcpu_id; 3817 spin_lock_init(&vcpu->arch.local_int.lock); 3818 vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(vcpu->kvm); 3819 seqcount_init(&vcpu->arch.cputm_seqcount); 3820 3821 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 3822 kvm_clear_async_pf_completion_queue(vcpu); 3823 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | 3824 KVM_SYNC_GPRS | 3825 KVM_SYNC_ACRS | 3826 KVM_SYNC_CRS | 3827 KVM_SYNC_ARCH0 | 3828 KVM_SYNC_PFAULT | 3829 KVM_SYNC_DIAG318; 3830 vcpu->arch.acrs_loaded = false; 3831 kvm_s390_set_prefix(vcpu, 0); 3832 if (test_kvm_facility(vcpu->kvm, 64)) 3833 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB; 3834 if (test_kvm_facility(vcpu->kvm, 82)) 3835 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC; 3836 if (test_kvm_facility(vcpu->kvm, 133)) 3837 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB; 3838 if (test_kvm_facility(vcpu->kvm, 156)) 3839 vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN; 3840 /* fprs can be synchronized via vrs, even if the guest has no vx. With 3841 * cpu_has_vx(), (load|store)_fpu_regs() will work with vrs format. 3842 */ 3843 if (cpu_has_vx()) 3844 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS; 3845 else 3846 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS; 3847 3848 if (kvm_is_ucontrol(vcpu->kvm)) { 3849 rc = -ENOMEM; 3850 vcpu->arch.gmap = gmap_new_child(vcpu->kvm->arch.gmap, -1UL); 3851 if (!vcpu->arch.gmap) 3852 goto out_free_sie_block; 3853 } 3854 3855 VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%p, sie block at 0x%p", 3856 vcpu->vcpu_id, vcpu, vcpu->arch.sie_block); 3857 trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block); 3858 3859 rc = kvm_s390_vcpu_setup(vcpu); 3860 if (rc) 3861 goto out_ucontrol_uninit; 3862 3863 kvm_s390_update_topology_change_report(vcpu->kvm, 1); 3864 return 0; 3865 3866 out_ucontrol_uninit: 3867 if (kvm_is_ucontrol(vcpu->kvm)) { 3868 gmap_remove_child(vcpu->arch.gmap); 3869 vcpu->arch.gmap = gmap_put(vcpu->arch.gmap); 3870 } 3871 out_free_sie_block: 3872 free_page((unsigned long)(vcpu->arch.sie_block)); 3873 return rc; 3874 } 3875 3876 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 3877 { 3878 clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask); 3879 return kvm_s390_vcpu_has_irq(vcpu, 0); 3880 } 3881 3882 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 3883 { 3884 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE); 3885 } 3886 3887 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu) 3888 { 3889 atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3890 exit_sie(vcpu); 3891 } 3892 3893 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu) 3894 { 3895 atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3896 } 3897 3898 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu) 3899 { 3900 atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3901 exit_sie(vcpu); 3902 } 3903 3904 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu) 3905 { 3906 return atomic_read(&vcpu->arch.sie_block->prog20) & 3907 (PROG_BLOCK_SIE | PROG_REQUEST); 3908 } 3909 3910 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu) 3911 { 3912 atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3913 } 3914 3915 /* 3916 * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running. 3917 * If the CPU is not running (e.g. waiting as idle) the function will 3918 * return immediately. */ 3919 void exit_sie(struct kvm_vcpu *vcpu) 3920 { 3921 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT); 3922 kvm_s390_vsie_kick(vcpu); 3923 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) 3924 cpu_relax(); 3925 } 3926 3927 /* Kick a guest cpu out of SIE to process a request synchronously */ 3928 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu) 3929 { 3930 __kvm_make_request(req, vcpu); 3931 kvm_s390_vcpu_request(vcpu); 3932 } 3933 3934 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu) 3935 { 3936 /* do not poll with more than halt_poll_max_steal percent of steal time */ 3937 if (get_lowcore()->avg_steal_timer * 100 / (TICK_USEC << 12) >= 3938 READ_ONCE(halt_poll_max_steal)) { 3939 vcpu->stat.halt_no_poll_steal++; 3940 return true; 3941 } 3942 return false; 3943 } 3944 3945 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 3946 { 3947 /* kvm common code refers to this, but never calls it */ 3948 BUG(); 3949 return 0; 3950 } 3951 3952 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, 3953 struct kvm_one_reg *reg) 3954 { 3955 int r = -EINVAL; 3956 3957 switch (reg->id) { 3958 case KVM_REG_S390_TODPR: 3959 r = put_user(vcpu->arch.sie_block->todpr, 3960 (u32 __user *)reg->addr); 3961 break; 3962 case KVM_REG_S390_EPOCHDIFF: 3963 r = put_user(vcpu->arch.sie_block->epoch, 3964 (u64 __user *)reg->addr); 3965 break; 3966 case KVM_REG_S390_CPU_TIMER: 3967 r = put_user(kvm_s390_get_cpu_timer(vcpu), 3968 (u64 __user *)reg->addr); 3969 break; 3970 case KVM_REG_S390_CLOCK_COMP: 3971 r = put_user(vcpu->arch.sie_block->ckc, 3972 (u64 __user *)reg->addr); 3973 break; 3974 case KVM_REG_S390_PFTOKEN: 3975 r = put_user(vcpu->arch.pfault_token, 3976 (u64 __user *)reg->addr); 3977 break; 3978 case KVM_REG_S390_PFCOMPARE: 3979 r = put_user(vcpu->arch.pfault_compare, 3980 (u64 __user *)reg->addr); 3981 break; 3982 case KVM_REG_S390_PFSELECT: 3983 r = put_user(vcpu->arch.pfault_select, 3984 (u64 __user *)reg->addr); 3985 break; 3986 case KVM_REG_S390_PP: 3987 r = put_user(vcpu->arch.sie_block->pp, 3988 (u64 __user *)reg->addr); 3989 break; 3990 case KVM_REG_S390_GBEA: 3991 r = put_user(vcpu->arch.sie_block->gbea, 3992 (u64 __user *)reg->addr); 3993 break; 3994 default: 3995 break; 3996 } 3997 3998 return r; 3999 } 4000 4001 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, 4002 struct kvm_one_reg *reg) 4003 { 4004 int r = -EINVAL; 4005 __u64 val; 4006 4007 switch (reg->id) { 4008 case KVM_REG_S390_TODPR: 4009 r = get_user(vcpu->arch.sie_block->todpr, 4010 (u32 __user *)reg->addr); 4011 break; 4012 case KVM_REG_S390_EPOCHDIFF: 4013 r = get_user(vcpu->arch.sie_block->epoch, 4014 (u64 __user *)reg->addr); 4015 break; 4016 case KVM_REG_S390_CPU_TIMER: 4017 r = get_user(val, (u64 __user *)reg->addr); 4018 if (!r) 4019 kvm_s390_set_cpu_timer(vcpu, val); 4020 break; 4021 case KVM_REG_S390_CLOCK_COMP: 4022 r = get_user(vcpu->arch.sie_block->ckc, 4023 (u64 __user *)reg->addr); 4024 break; 4025 case KVM_REG_S390_PFTOKEN: 4026 r = get_user(vcpu->arch.pfault_token, 4027 (u64 __user *)reg->addr); 4028 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 4029 kvm_clear_async_pf_completion_queue(vcpu); 4030 break; 4031 case KVM_REG_S390_PFCOMPARE: 4032 r = get_user(vcpu->arch.pfault_compare, 4033 (u64 __user *)reg->addr); 4034 break; 4035 case KVM_REG_S390_PFSELECT: 4036 r = get_user(vcpu->arch.pfault_select, 4037 (u64 __user *)reg->addr); 4038 break; 4039 case KVM_REG_S390_PP: 4040 r = get_user(vcpu->arch.sie_block->pp, 4041 (u64 __user *)reg->addr); 4042 break; 4043 case KVM_REG_S390_GBEA: 4044 r = get_user(vcpu->arch.sie_block->gbea, 4045 (u64 __user *)reg->addr); 4046 break; 4047 default: 4048 break; 4049 } 4050 4051 return r; 4052 } 4053 4054 static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu) 4055 { 4056 vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI; 4057 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 4058 memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb)); 4059 4060 kvm_clear_async_pf_completion_queue(vcpu); 4061 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) 4062 kvm_s390_vcpu_stop(vcpu); 4063 kvm_s390_clear_local_irqs(vcpu); 4064 } 4065 4066 static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) 4067 { 4068 /* Initial reset is a superset of the normal reset */ 4069 kvm_arch_vcpu_ioctl_normal_reset(vcpu); 4070 4071 /* 4072 * This equals initial cpu reset in pop, but we don't switch to ESA. 4073 * We do not only reset the internal data, but also ... 4074 */ 4075 vcpu->arch.sie_block->gpsw.mask = 0; 4076 vcpu->arch.sie_block->gpsw.addr = 0; 4077 kvm_s390_set_prefix(vcpu, 0); 4078 kvm_s390_set_cpu_timer(vcpu, 0); 4079 vcpu->arch.sie_block->ckc = 0; 4080 memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr)); 4081 vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK; 4082 vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK; 4083 4084 /* ... the data in sync regs */ 4085 memset(vcpu->run->s.regs.crs, 0, sizeof(vcpu->run->s.regs.crs)); 4086 vcpu->run->s.regs.ckc = 0; 4087 vcpu->run->s.regs.crs[0] = CR0_INITIAL_MASK; 4088 vcpu->run->s.regs.crs[14] = CR14_INITIAL_MASK; 4089 vcpu->run->psw_addr = 0; 4090 vcpu->run->psw_mask = 0; 4091 vcpu->run->s.regs.todpr = 0; 4092 vcpu->run->s.regs.cputm = 0; 4093 vcpu->run->s.regs.ckc = 0; 4094 vcpu->run->s.regs.pp = 0; 4095 vcpu->run->s.regs.gbea = 1; 4096 vcpu->run->s.regs.fpc = 0; 4097 /* 4098 * Do not reset these registers in the protected case, as some of 4099 * them are overlaid and they are not accessible in this case 4100 * anyway. 4101 */ 4102 if (!kvm_s390_pv_cpu_is_protected(vcpu)) { 4103 vcpu->arch.sie_block->gbea = 1; 4104 vcpu->arch.sie_block->pp = 0; 4105 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 4106 vcpu->arch.sie_block->todpr = 0; 4107 } 4108 } 4109 4110 static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu) 4111 { 4112 struct kvm_sync_regs *regs = &vcpu->run->s.regs; 4113 4114 /* Clear reset is a superset of the initial reset */ 4115 kvm_arch_vcpu_ioctl_initial_reset(vcpu); 4116 4117 memset(®s->gprs, 0, sizeof(regs->gprs)); 4118 memset(®s->vrs, 0, sizeof(regs->vrs)); 4119 memset(®s->acrs, 0, sizeof(regs->acrs)); 4120 memset(®s->gscb, 0, sizeof(regs->gscb)); 4121 4122 regs->etoken = 0; 4123 regs->etoken_extension = 0; 4124 } 4125 4126 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 4127 { 4128 vcpu_load(vcpu); 4129 memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); 4130 vcpu_put(vcpu); 4131 return 0; 4132 } 4133 4134 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 4135 { 4136 vcpu_load(vcpu); 4137 memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); 4138 vcpu_put(vcpu); 4139 return 0; 4140 } 4141 4142 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 4143 struct kvm_sregs *sregs) 4144 { 4145 vcpu_load(vcpu); 4146 4147 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); 4148 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); 4149 4150 vcpu_put(vcpu); 4151 return 0; 4152 } 4153 4154 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 4155 struct kvm_sregs *sregs) 4156 { 4157 vcpu_load(vcpu); 4158 4159 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); 4160 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); 4161 4162 vcpu_put(vcpu); 4163 return 0; 4164 } 4165 4166 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 4167 { 4168 vcpu_load(vcpu); 4169 4170 vcpu->run->s.regs.fpc = fpu->fpc; 4171 if (cpu_has_vx()) 4172 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs, 4173 (freg_t *) fpu->fprs); 4174 else 4175 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs)); 4176 4177 vcpu_put(vcpu); 4178 return 0; 4179 } 4180 4181 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 4182 { 4183 vcpu_load(vcpu); 4184 4185 if (cpu_has_vx()) 4186 convert_vx_to_fp((freg_t *) fpu->fprs, 4187 (__vector128 *) vcpu->run->s.regs.vrs); 4188 else 4189 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs)); 4190 fpu->fpc = vcpu->run->s.regs.fpc; 4191 4192 vcpu_put(vcpu); 4193 return 0; 4194 } 4195 4196 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) 4197 { 4198 int rc = 0; 4199 4200 if (!is_vcpu_stopped(vcpu)) 4201 rc = -EBUSY; 4202 else { 4203 vcpu->run->psw_mask = psw.mask; 4204 vcpu->run->psw_addr = psw.addr; 4205 } 4206 return rc; 4207 } 4208 4209 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 4210 struct kvm_translation *tr) 4211 { 4212 return -EINVAL; /* not implemented yet */ 4213 } 4214 4215 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ 4216 KVM_GUESTDBG_USE_HW_BP | \ 4217 KVM_GUESTDBG_ENABLE) 4218 4219 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 4220 struct kvm_guest_debug *dbg) 4221 { 4222 int rc = 0; 4223 4224 vcpu_load(vcpu); 4225 4226 vcpu->guest_debug = 0; 4227 kvm_s390_clear_bp_data(vcpu); 4228 4229 if (dbg->control & ~VALID_GUESTDBG_FLAGS) { 4230 rc = -EINVAL; 4231 goto out; 4232 } 4233 if (!sclp.has_gpere) { 4234 rc = -EINVAL; 4235 goto out; 4236 } 4237 4238 if (dbg->control & KVM_GUESTDBG_ENABLE) { 4239 vcpu->guest_debug = dbg->control; 4240 /* enforce guest PER */ 4241 kvm_s390_set_cpuflags(vcpu, CPUSTAT_P); 4242 4243 if (dbg->control & KVM_GUESTDBG_USE_HW_BP) 4244 rc = kvm_s390_import_bp_data(vcpu, dbg); 4245 } else { 4246 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 4247 vcpu->arch.guestdbg.last_bp = 0; 4248 } 4249 4250 if (rc) { 4251 vcpu->guest_debug = 0; 4252 kvm_s390_clear_bp_data(vcpu); 4253 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 4254 } 4255 4256 out: 4257 vcpu_put(vcpu); 4258 return rc; 4259 } 4260 4261 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 4262 struct kvm_mp_state *mp_state) 4263 { 4264 int ret; 4265 4266 vcpu_load(vcpu); 4267 4268 /* CHECK_STOP and LOAD are not supported yet */ 4269 ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED : 4270 KVM_MP_STATE_OPERATING; 4271 4272 vcpu_put(vcpu); 4273 return ret; 4274 } 4275 4276 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 4277 struct kvm_mp_state *mp_state) 4278 { 4279 int rc = 0; 4280 4281 vcpu_load(vcpu); 4282 4283 /* user space knows about this interface - let it control the state */ 4284 kvm_s390_set_user_cpu_state_ctrl(vcpu->kvm); 4285 4286 switch (mp_state->mp_state) { 4287 case KVM_MP_STATE_STOPPED: 4288 rc = kvm_s390_vcpu_stop(vcpu); 4289 break; 4290 case KVM_MP_STATE_OPERATING: 4291 rc = kvm_s390_vcpu_start(vcpu); 4292 break; 4293 case KVM_MP_STATE_LOAD: 4294 if (!kvm_s390_pv_cpu_is_protected(vcpu)) { 4295 rc = -ENXIO; 4296 break; 4297 } 4298 rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD); 4299 break; 4300 case KVM_MP_STATE_CHECK_STOP: 4301 fallthrough; /* CHECK_STOP and LOAD are not supported yet */ 4302 default: 4303 rc = -ENXIO; 4304 } 4305 4306 vcpu_put(vcpu); 4307 return rc; 4308 } 4309 4310 static bool ibs_enabled(struct kvm_vcpu *vcpu) 4311 { 4312 return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS); 4313 } 4314 4315 static int vcpu_ucontrol_translate(struct kvm_vcpu *vcpu, gpa_t *gaddr) 4316 { 4317 int rc; 4318 4319 if (kvm_is_ucontrol(vcpu->kvm)) { 4320 rc = gmap_ucas_translate(vcpu->arch.mc, vcpu->arch.gmap, gaddr); 4321 if (rc == -EREMOTE) { 4322 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; 4323 vcpu->run->s390_ucontrol.trans_exc_code = *gaddr; 4324 vcpu->run->s390_ucontrol.pgm_code = PGM_SEGMENT_TRANSLATION; 4325 } 4326 return rc; 4327 } 4328 return 0; 4329 } 4330 4331 static int kvm_s390_fixup_prefix(struct kvm_vcpu *vcpu) 4332 { 4333 gpa_t gaddr = kvm_s390_get_prefix(vcpu); 4334 gfn_t gfn; 4335 int rc; 4336 4337 if (vcpu_ucontrol_translate(vcpu, &gaddr)) 4338 return -EREMOTE; 4339 gfn = gpa_to_gfn(gaddr); 4340 4341 rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gfn, true); 4342 if (rc) 4343 return rc; 4344 rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gfn + 1, true); 4345 if (rc) 4346 return rc; 4347 4348 scoped_guard(write_lock, &vcpu->kvm->mmu_lock) 4349 rc = dat_set_prefix_notif_bit(vcpu->kvm->arch.gmap->asce, gfn); 4350 return rc; 4351 } 4352 4353 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) 4354 { 4355 retry: 4356 kvm_s390_vcpu_request_handled(vcpu); 4357 if (!kvm_request_pending(vcpu)) 4358 return 0; 4359 /* 4360 * If the guest prefix changed, re-arm the ipte notifier for the 4361 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock. 4362 * This ensures that the ipte instruction for this request has 4363 * already finished. We might race against a second unmapper that 4364 * wants to set the blocking bit. Lets just retry the request loop. 4365 */ 4366 if (kvm_check_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu)) { 4367 int rc; 4368 4369 rc = kvm_s390_fixup_prefix(vcpu); 4370 if (rc) { 4371 kvm_make_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu); 4372 return rc; 4373 } 4374 goto retry; 4375 } 4376 4377 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { 4378 vcpu->arch.sie_block->ihcpu = 0xffff; 4379 goto retry; 4380 } 4381 4382 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { 4383 if (!ibs_enabled(vcpu)) { 4384 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); 4385 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS); 4386 } 4387 goto retry; 4388 } 4389 4390 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { 4391 if (ibs_enabled(vcpu)) { 4392 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); 4393 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS); 4394 } 4395 goto retry; 4396 } 4397 4398 if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) { 4399 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 4400 goto retry; 4401 } 4402 4403 if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) { 4404 /* 4405 * Disable CMM virtualization; we will emulate the ESSA 4406 * instruction manually, in order to provide additional 4407 * functionalities needed for live migration. 4408 */ 4409 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA; 4410 goto retry; 4411 } 4412 4413 if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) { 4414 /* 4415 * Re-enable CMM virtualization if CMMA is available and 4416 * CMM has been used. 4417 */ 4418 if (vcpu->kvm->arch.use_cmma && uses_cmm(vcpu->arch.gmap)) 4419 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 4420 goto retry; 4421 } 4422 4423 /* we left the vsie handler, nothing to do, just clear the request */ 4424 kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu); 4425 4426 return 0; 4427 } 4428 4429 static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) 4430 { 4431 struct kvm_vcpu *vcpu; 4432 union tod_clock clk; 4433 unsigned long i; 4434 4435 preempt_disable(); 4436 4437 store_tod_clock_ext(&clk); 4438 4439 kvm->arch.epoch = gtod->tod - clk.tod; 4440 kvm->arch.epdx = 0; 4441 if (test_kvm_facility(kvm, 139)) { 4442 kvm->arch.epdx = gtod->epoch_idx - clk.ei; 4443 if (kvm->arch.epoch > gtod->tod) 4444 kvm->arch.epdx -= 1; 4445 } 4446 4447 kvm_s390_vcpu_block_all(kvm); 4448 kvm_for_each_vcpu(i, vcpu, kvm) { 4449 vcpu->arch.sie_block->epoch = kvm->arch.epoch; 4450 vcpu->arch.sie_block->epdx = kvm->arch.epdx; 4451 } 4452 4453 kvm_s390_vcpu_unblock_all(kvm); 4454 preempt_enable(); 4455 } 4456 4457 int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) 4458 { 4459 if (!mutex_trylock(&kvm->lock)) 4460 return 0; 4461 __kvm_s390_set_tod_clock(kvm, gtod); 4462 mutex_unlock(&kvm->lock); 4463 return 1; 4464 } 4465 4466 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, 4467 unsigned long token) 4468 { 4469 struct kvm_s390_interrupt inti; 4470 struct kvm_s390_irq irq; 4471 struct kvm_s390_interrupt_info *inti_mem = NULL; 4472 int ret = 0; 4473 4474 if (start_token) { 4475 irq.u.ext.ext_params2 = token; 4476 irq.type = KVM_S390_INT_PFAULT_INIT; 4477 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq)); 4478 } else { 4479 inti_mem = kzalloc_obj(*inti_mem, GFP_KERNEL_ACCOUNT); 4480 if (WARN_ON_ONCE(!inti_mem)) 4481 return; 4482 4483 inti.type = KVM_S390_INT_PFAULT_DONE; 4484 inti.parm64 = token; 4485 ret = kvm_s390_inject_vm(vcpu->kvm, &inti, inti_mem); 4486 if (ret) 4487 kfree(inti_mem); 4488 WARN_ON_ONCE(ret); 4489 } 4490 } 4491 4492 bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 4493 struct kvm_async_pf *work) 4494 { 4495 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); 4496 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); 4497 4498 return true; 4499 } 4500 4501 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 4502 struct kvm_async_pf *work) 4503 { 4504 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); 4505 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); 4506 } 4507 4508 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, 4509 struct kvm_async_pf *work) 4510 { 4511 /* s390 will always inject the page directly */ 4512 } 4513 4514 bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu) 4515 { 4516 /* 4517 * s390 will always inject the page directly, 4518 * but we still want check_async_completion to cleanup 4519 */ 4520 return true; 4521 } 4522 4523 bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) 4524 { 4525 hva_t hva; 4526 struct kvm_arch_async_pf arch; 4527 4528 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 4529 return false; 4530 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != 4531 vcpu->arch.pfault_compare) 4532 return false; 4533 if (psw_extint_disabled(vcpu)) 4534 return false; 4535 if (kvm_s390_vcpu_has_irq(vcpu, 0)) 4536 return false; 4537 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) 4538 return false; 4539 if (!pfault_enabled(vcpu->arch.gmap)) 4540 return false; 4541 4542 hva = gfn_to_hva(vcpu->kvm, current->thread.gmap_teid.addr); 4543 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) 4544 return false; 4545 4546 return kvm_setup_async_pf(vcpu, current->thread.gmap_teid.addr * PAGE_SIZE, hva, &arch); 4547 } 4548 4549 static int vcpu_pre_run(struct kvm_vcpu *vcpu) 4550 { 4551 int rc, cpuflags; 4552 4553 /* 4554 * On s390 notifications for arriving pages will be delivered directly 4555 * to the guest but the house keeping for completed pfaults is 4556 * handled outside the worker. 4557 */ 4558 kvm_check_async_pf_completion(vcpu); 4559 4560 vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14]; 4561 vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15]; 4562 4563 if (!kvm_is_ucontrol(vcpu->kvm)) { 4564 rc = kvm_s390_deliver_pending_interrupts(vcpu); 4565 if (rc || guestdbg_exit_pending(vcpu)) 4566 return rc; 4567 } 4568 4569 rc = kvm_s390_handle_requests(vcpu); 4570 if (rc) 4571 return rc; 4572 4573 if (guestdbg_enabled(vcpu)) { 4574 kvm_s390_backup_guest_per_regs(vcpu); 4575 kvm_s390_patch_guest_per_regs(vcpu); 4576 } 4577 4578 clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask); 4579 4580 vcpu->arch.sie_block->icptcode = 0; 4581 current->thread.gmap_int_code = 0; 4582 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); 4583 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); 4584 trace_kvm_s390_sie_enter(vcpu, cpuflags); 4585 4586 return 0; 4587 } 4588 4589 static int vcpu_post_run_addressing_exception(struct kvm_vcpu *vcpu) 4590 { 4591 struct kvm_s390_pgm_info pgm_info = { 4592 .code = PGM_ADDRESSING, 4593 }; 4594 u8 opcode, ilen; 4595 int rc; 4596 4597 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); 4598 trace_kvm_s390_sie_fault(vcpu); 4599 4600 /* 4601 * We want to inject an addressing exception, which is defined as a 4602 * suppressing or terminating exception. However, since we came here 4603 * by a DAT access exception, the PSW still points to the faulting 4604 * instruction since DAT exceptions are nullifying. So we've got 4605 * to look up the current opcode to get the length of the instruction 4606 * to be able to forward the PSW. 4607 */ 4608 rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1); 4609 ilen = insn_length(opcode); 4610 if (rc < 0) { 4611 return rc; 4612 } else if (rc) { 4613 /* Instruction-Fetching Exceptions - we can't detect the ilen. 4614 * Forward by arbitrary ilc, injection will take care of 4615 * nullification if necessary. 4616 */ 4617 pgm_info = vcpu->arch.pgm; 4618 ilen = 4; 4619 } 4620 pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID; 4621 kvm_s390_forward_psw(vcpu, ilen); 4622 return kvm_s390_inject_prog_irq(vcpu, &pgm_info); 4623 } 4624 4625 static void kvm_s390_assert_primary_as(struct kvm_vcpu *vcpu) 4626 { 4627 KVM_BUG(current->thread.gmap_teid.as != PSW_BITS_AS_PRIMARY, vcpu->kvm, 4628 "Unexpected program interrupt 0x%x, TEID 0x%016lx", 4629 current->thread.gmap_int_code, current->thread.gmap_teid.val); 4630 } 4631 4632 static int vcpu_dat_fault_handler(struct kvm_vcpu *vcpu, gpa_t gaddr, bool wr) 4633 { 4634 struct guest_fault f = { 4635 .write_attempt = wr, 4636 .attempt_pfault = pfault_enabled(vcpu->arch.gmap), 4637 }; 4638 int rc; 4639 4640 if (vcpu_ucontrol_translate(vcpu, &gaddr)) 4641 return -EREMOTE; 4642 f.gfn = gpa_to_gfn(gaddr); 4643 4644 rc = kvm_s390_faultin_gfn(vcpu, NULL, &f); 4645 if (rc <= 0) 4646 return rc; 4647 if (rc == PGM_ADDRESSING) 4648 return vcpu_post_run_addressing_exception(vcpu); 4649 KVM_BUG_ON(rc, vcpu->kvm); 4650 return -EINVAL; 4651 } 4652 4653 static int vcpu_post_run_handle_fault(struct kvm_vcpu *vcpu) 4654 { 4655 unsigned int foll = 0; 4656 unsigned long gaddr; 4657 int rc; 4658 4659 gaddr = current->thread.gmap_teid.addr * PAGE_SIZE; 4660 if (kvm_s390_cur_gmap_fault_is_write()) 4661 foll = FOLL_WRITE; 4662 4663 switch (current->thread.gmap_int_code & PGM_INT_CODE_MASK) { 4664 case 0: 4665 vcpu->stat.exit_null++; 4666 break; 4667 case PGM_SECURE_STORAGE_ACCESS: 4668 case PGM_SECURE_STORAGE_VIOLATION: 4669 kvm_s390_assert_primary_as(vcpu); 4670 /* 4671 * This can happen after a reboot with asynchronous teardown; 4672 * the new guest (normal or protected) will run on top of the 4673 * previous protected guest. The old pages need to be destroyed 4674 * so the new guest can use them. 4675 */ 4676 if (kvm_s390_pv_destroy_page(vcpu->kvm, gaddr)) { 4677 /* 4678 * Either KVM messed up the secure guest mapping or the 4679 * same page is mapped into multiple secure guests. 4680 * 4681 * This exception is only triggered when a guest 2 is 4682 * running and can therefore never occur in kernel 4683 * context. 4684 */ 4685 pr_warn_ratelimited("Secure storage violation (%x) in task: %s, pid %d\n", 4686 current->thread.gmap_int_code, current->comm, 4687 current->pid); 4688 send_sig(SIGSEGV, current, 0); 4689 } 4690 break; 4691 case PGM_NON_SECURE_STORAGE_ACCESS: 4692 kvm_s390_assert_primary_as(vcpu); 4693 /* 4694 * This is normal operation; a page belonging to a protected 4695 * guest has not been imported yet. Try to import the page into 4696 * the protected guest. 4697 */ 4698 rc = kvm_s390_pv_convert_to_secure(vcpu->kvm, gaddr); 4699 if (rc == -EINVAL) 4700 send_sig(SIGSEGV, current, 0); 4701 if (rc != -ENXIO) 4702 break; 4703 foll = FOLL_WRITE; 4704 fallthrough; 4705 case PGM_PROTECTION: 4706 case PGM_SEGMENT_TRANSLATION: 4707 case PGM_PAGE_TRANSLATION: 4708 case PGM_ASCE_TYPE: 4709 case PGM_REGION_FIRST_TRANS: 4710 case PGM_REGION_SECOND_TRANS: 4711 case PGM_REGION_THIRD_TRANS: 4712 kvm_s390_assert_primary_as(vcpu); 4713 return vcpu_dat_fault_handler(vcpu, gaddr, foll); 4714 default: 4715 KVM_BUG(1, vcpu->kvm, "Unexpected program interrupt 0x%x, TEID 0x%016lx", 4716 current->thread.gmap_int_code, current->thread.gmap_teid.val); 4717 send_sig(SIGSEGV, current, 0); 4718 break; 4719 } 4720 return 0; 4721 } 4722 4723 static int vcpu_post_run(struct kvm_vcpu *vcpu, int sie_return) 4724 { 4725 struct mcck_volatile_info *mcck_info; 4726 struct sie_page *sie_page; 4727 int rc; 4728 4729 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", 4730 vcpu->arch.sie_block->icptcode); 4731 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); 4732 4733 if (guestdbg_enabled(vcpu)) 4734 kvm_s390_restore_guest_per_regs(vcpu); 4735 4736 vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14; 4737 vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15; 4738 4739 if (sie_return == SIE64_RETURN_MCCK) { 4740 sie_page = container_of(vcpu->arch.sie_block, 4741 struct sie_page, sie_block); 4742 mcck_info = &sie_page->mcck_info; 4743 kvm_s390_reinject_machine_check(vcpu, mcck_info); 4744 return 0; 4745 } 4746 WARN_ON_ONCE(sie_return != SIE64_RETURN_NORMAL); 4747 4748 if (vcpu->arch.sie_block->icptcode > 0) { 4749 rc = kvm_handle_sie_intercept(vcpu); 4750 4751 if (rc != -EOPNOTSUPP) 4752 return rc; 4753 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC; 4754 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; 4755 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; 4756 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; 4757 return -EREMOTE; 4758 } 4759 4760 return vcpu_post_run_handle_fault(vcpu); 4761 } 4762 4763 int noinstr kvm_s390_enter_exit_sie(struct kvm_s390_sie_block *scb, 4764 u64 *gprs, unsigned long gasce) 4765 { 4766 int ret; 4767 4768 guest_state_enter_irqoff(); 4769 4770 /* 4771 * The guest_state_{enter,exit}_irqoff() functions inform lockdep and 4772 * tracing that entry to the guest will enable host IRQs, and exit from 4773 * the guest will disable host IRQs. 4774 */ 4775 ret = sie64a(scb, gprs, gasce); 4776 4777 guest_state_exit_irqoff(); 4778 4779 return ret; 4780 } 4781 4782 #define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK) 4783 static int __vcpu_run(struct kvm_vcpu *vcpu) 4784 { 4785 int rc, sie_return; 4786 struct sie_page *sie_page = (struct sie_page *)vcpu->arch.sie_block; 4787 4788 /* 4789 * We try to hold kvm->srcu during most of vcpu_run (except when run- 4790 * ning the guest), so that memslots (and other stuff) are protected 4791 */ 4792 kvm_vcpu_srcu_read_lock(vcpu); 4793 4794 while (true) { 4795 rc = vcpu_pre_run(vcpu); 4796 kvm_vcpu_srcu_read_unlock(vcpu); 4797 if (rc || guestdbg_exit_pending(vcpu)) 4798 break; 4799 4800 /* 4801 * As PF_VCPU will be used in fault handler, between 4802 * guest_timing_enter_irqoff and guest_timing_exit_irqoff 4803 * should be no uaccess. 4804 */ 4805 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 4806 memcpy(sie_page->pv_grregs, 4807 vcpu->run->s.regs.gprs, 4808 sizeof(sie_page->pv_grregs)); 4809 } 4810 4811 xfer_to_guest_mode_check: 4812 local_irq_disable(); 4813 xfer_to_guest_mode_prepare(); 4814 if (xfer_to_guest_mode_work_pending()) { 4815 local_irq_enable(); 4816 rc = kvm_xfer_to_guest_mode_handle_work(vcpu); 4817 if (rc) 4818 break; 4819 goto xfer_to_guest_mode_check; 4820 } 4821 4822 guest_timing_enter_irqoff(); 4823 __disable_cpu_timer_accounting(vcpu); 4824 4825 sie_return = kvm_s390_enter_exit_sie(vcpu->arch.sie_block, 4826 vcpu->run->s.regs.gprs, 4827 vcpu->arch.gmap->asce.val); 4828 4829 __enable_cpu_timer_accounting(vcpu); 4830 guest_timing_exit_irqoff(); 4831 local_irq_enable(); 4832 4833 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 4834 memcpy(vcpu->run->s.regs.gprs, 4835 sie_page->pv_grregs, 4836 sizeof(sie_page->pv_grregs)); 4837 /* 4838 * We're not allowed to inject interrupts on intercepts 4839 * that leave the guest state in an "in-between" state 4840 * where the next SIE entry will do a continuation. 4841 * Fence interrupts in our "internal" PSW. 4842 */ 4843 if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR || 4844 vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) { 4845 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK; 4846 } 4847 } 4848 kvm_vcpu_srcu_read_lock(vcpu); 4849 4850 rc = vcpu_post_run(vcpu, sie_return); 4851 if (rc || guestdbg_exit_pending(vcpu)) { 4852 kvm_vcpu_srcu_read_unlock(vcpu); 4853 break; 4854 } 4855 } 4856 4857 return rc; 4858 } 4859 4860 static void sync_regs_fmt2(struct kvm_vcpu *vcpu) 4861 { 4862 struct kvm_run *kvm_run = vcpu->run; 4863 struct runtime_instr_cb *riccb; 4864 struct gs_cb *gscb; 4865 4866 riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb; 4867 gscb = (struct gs_cb *) &kvm_run->s.regs.gscb; 4868 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; 4869 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; 4870 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 4871 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr; 4872 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp; 4873 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea; 4874 } 4875 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) { 4876 vcpu->arch.pfault_token = kvm_run->s.regs.pft; 4877 vcpu->arch.pfault_select = kvm_run->s.regs.pfs; 4878 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc; 4879 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 4880 kvm_clear_async_pf_completion_queue(vcpu); 4881 } 4882 if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) { 4883 vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318; 4884 vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc; 4885 VCPU_EVENT(vcpu, 3, "setting cpnc to %d", vcpu->arch.diag318_info.cpnc); 4886 } 4887 /* 4888 * If userspace sets the riccb (e.g. after migration) to a valid state, 4889 * we should enable RI here instead of doing the lazy enablement. 4890 */ 4891 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) && 4892 test_kvm_facility(vcpu->kvm, 64) && 4893 riccb->v && 4894 !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) { 4895 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)"); 4896 vcpu->arch.sie_block->ecb3 |= ECB3_RI; 4897 } 4898 /* 4899 * If userspace sets the gscb (e.g. after migration) to non-zero, 4900 * we should enable GS here instead of doing the lazy enablement. 4901 */ 4902 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) && 4903 test_kvm_facility(vcpu->kvm, 133) && 4904 gscb->gssm && 4905 !vcpu->arch.gs_enabled) { 4906 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)"); 4907 vcpu->arch.sie_block->ecb |= ECB_GS; 4908 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 4909 vcpu->arch.gs_enabled = 1; 4910 } 4911 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) && 4912 test_kvm_facility(vcpu->kvm, 82)) { 4913 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 4914 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0; 4915 } 4916 if (cpu_has_gs()) { 4917 preempt_disable(); 4918 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT); 4919 if (current->thread.gs_cb) { 4920 vcpu->arch.host_gscb = current->thread.gs_cb; 4921 save_gs_cb(vcpu->arch.host_gscb); 4922 } 4923 if (vcpu->arch.gs_enabled) { 4924 current->thread.gs_cb = (struct gs_cb *) 4925 &vcpu->run->s.regs.gscb; 4926 restore_gs_cb(current->thread.gs_cb); 4927 } 4928 preempt_enable(); 4929 } 4930 /* SIE will load etoken directly from SDNX and therefore kvm_run */ 4931 } 4932 4933 static void sync_regs(struct kvm_vcpu *vcpu) 4934 { 4935 struct kvm_run *kvm_run = vcpu->run; 4936 4937 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) 4938 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); 4939 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { 4940 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); 4941 /* some control register changes require a tlb flush */ 4942 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 4943 } 4944 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 4945 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm); 4946 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc; 4947 } 4948 save_access_regs(vcpu->arch.host_acrs); 4949 restore_access_regs(vcpu->run->s.regs.acrs); 4950 vcpu->arch.acrs_loaded = true; 4951 kvm_s390_fpu_load(vcpu->run); 4952 /* Sync fmt2 only data */ 4953 if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) { 4954 sync_regs_fmt2(vcpu); 4955 } else { 4956 /* 4957 * In several places we have to modify our internal view to 4958 * not do things that are disallowed by the ultravisor. For 4959 * example we must not inject interrupts after specific exits 4960 * (e.g. 112 prefix page not secure). We do this by turning 4961 * off the machine check, external and I/O interrupt bits 4962 * of our PSW copy. To avoid getting validity intercepts, we 4963 * do only accept the condition code from userspace. 4964 */ 4965 vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC; 4966 vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask & 4967 PSW_MASK_CC; 4968 } 4969 4970 kvm_run->kvm_dirty_regs = 0; 4971 } 4972 4973 static void store_regs_fmt2(struct kvm_vcpu *vcpu) 4974 { 4975 struct kvm_run *kvm_run = vcpu->run; 4976 4977 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr; 4978 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp; 4979 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea; 4980 kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC; 4981 kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val; 4982 if (cpu_has_gs()) { 4983 preempt_disable(); 4984 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT); 4985 if (vcpu->arch.gs_enabled) 4986 save_gs_cb(current->thread.gs_cb); 4987 current->thread.gs_cb = vcpu->arch.host_gscb; 4988 restore_gs_cb(vcpu->arch.host_gscb); 4989 if (!vcpu->arch.host_gscb) 4990 local_ctl_clear_bit(2, CR2_GUARDED_STORAGE_BIT); 4991 vcpu->arch.host_gscb = NULL; 4992 preempt_enable(); 4993 } 4994 /* SIE will save etoken directly into SDNX and therefore kvm_run */ 4995 } 4996 4997 static void store_regs(struct kvm_vcpu *vcpu) 4998 { 4999 struct kvm_run *kvm_run = vcpu->run; 5000 5001 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; 5002 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; 5003 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu); 5004 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); 5005 kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu); 5006 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc; 5007 kvm_run->s.regs.pft = vcpu->arch.pfault_token; 5008 kvm_run->s.regs.pfs = vcpu->arch.pfault_select; 5009 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare; 5010 save_access_regs(vcpu->run->s.regs.acrs); 5011 restore_access_regs(vcpu->arch.host_acrs); 5012 vcpu->arch.acrs_loaded = false; 5013 kvm_s390_fpu_store(vcpu->run); 5014 if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) 5015 store_regs_fmt2(vcpu); 5016 } 5017 5018 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) 5019 { 5020 struct kvm_run *kvm_run = vcpu->run; 5021 DECLARE_KERNEL_FPU_ONSTACK32(fpu); 5022 int rc; 5023 5024 /* 5025 * Running a VM while dumping always has the potential to 5026 * produce inconsistent dump data. But for PV vcpus a SIE 5027 * entry while dumping could also lead to a fatal validity 5028 * intercept which we absolutely want to avoid. 5029 */ 5030 if (vcpu->kvm->arch.pv.dumping) 5031 return -EINVAL; 5032 5033 if (!vcpu->wants_to_run) 5034 return -EINTR; 5035 5036 if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS || 5037 kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS) 5038 return -EINVAL; 5039 5040 vcpu_load(vcpu); 5041 5042 if (guestdbg_exit_pending(vcpu)) { 5043 kvm_s390_prepare_debug_exit(vcpu); 5044 rc = 0; 5045 goto out; 5046 } 5047 5048 kvm_sigset_activate(vcpu); 5049 5050 /* 5051 * no need to check the return value of vcpu_start as it can only have 5052 * an error for protvirt, but protvirt means user cpu state 5053 */ 5054 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) { 5055 kvm_s390_vcpu_start(vcpu); 5056 } else if (is_vcpu_stopped(vcpu)) { 5057 pr_err_ratelimited("can't run stopped vcpu %d\n", 5058 vcpu->vcpu_id); 5059 rc = -EINVAL; 5060 goto out; 5061 } 5062 5063 kernel_fpu_begin(&fpu, KERNEL_FPC | KERNEL_VXR); 5064 sync_regs(vcpu); 5065 enable_cpu_timer_accounting(vcpu); 5066 5067 might_fault(); 5068 rc = __vcpu_run(vcpu); 5069 5070 if (signal_pending(current) && !rc) { 5071 kvm_run->exit_reason = KVM_EXIT_INTR; 5072 vcpu->stat.signal_exits++; 5073 rc = -EINTR; 5074 } 5075 5076 if (guestdbg_exit_pending(vcpu) && !rc) { 5077 kvm_s390_prepare_debug_exit(vcpu); 5078 rc = 0; 5079 } 5080 5081 if (rc == -EREMOTE) { 5082 /* userspace support is needed, kvm_run has been prepared */ 5083 rc = 0; 5084 } 5085 5086 disable_cpu_timer_accounting(vcpu); 5087 store_regs(vcpu); 5088 kernel_fpu_end(&fpu, KERNEL_FPC | KERNEL_VXR); 5089 5090 kvm_sigset_deactivate(vcpu); 5091 5092 vcpu->stat.exit_userspace++; 5093 out: 5094 vcpu_put(vcpu); 5095 return rc; 5096 } 5097 5098 /* 5099 * store status at address 5100 * we use have two special cases: 5101 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit 5102 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix 5103 */ 5104 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) 5105 { 5106 unsigned char archmode = 1; 5107 freg_t fprs[NUM_FPRS]; 5108 unsigned int px; 5109 u64 clkcomp, cputm; 5110 int rc; 5111 5112 px = kvm_s390_get_prefix(vcpu); 5113 if (gpa == KVM_S390_STORE_STATUS_NOADDR) { 5114 if (write_guest_abs(vcpu, 163, &archmode, 1)) 5115 return -EFAULT; 5116 gpa = 0; 5117 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { 5118 if (write_guest_real(vcpu, 163, &archmode, 1)) 5119 return -EFAULT; 5120 gpa = px; 5121 } else 5122 gpa -= __LC_FPREGS_SAVE_AREA; 5123 5124 /* manually convert vector registers if necessary */ 5125 if (cpu_has_vx()) { 5126 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs); 5127 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 5128 fprs, 128); 5129 } else { 5130 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 5131 vcpu->run->s.regs.fprs, 128); 5132 } 5133 rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA, 5134 vcpu->run->s.regs.gprs, 128); 5135 rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA, 5136 &vcpu->arch.sie_block->gpsw, 16); 5137 rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA, 5138 &px, 4); 5139 rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA, 5140 &vcpu->run->s.regs.fpc, 4); 5141 rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA, 5142 &vcpu->arch.sie_block->todpr, 4); 5143 cputm = kvm_s390_get_cpu_timer(vcpu); 5144 rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA, 5145 &cputm, 8); 5146 clkcomp = vcpu->arch.sie_block->ckc >> 8; 5147 rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA, 5148 &clkcomp, 8); 5149 rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA, 5150 &vcpu->run->s.regs.acrs, 64); 5151 rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA, 5152 &vcpu->arch.sie_block->gcr, 128); 5153 return rc ? -EFAULT : 0; 5154 } 5155 5156 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) 5157 { 5158 /* 5159 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy 5160 * switch in the run ioctl. Let's update our copies before we save 5161 * it into the save area 5162 */ 5163 kvm_s390_fpu_store(vcpu->run); 5164 save_access_regs(vcpu->run->s.regs.acrs); 5165 5166 return kvm_s390_store_status_unloaded(vcpu, addr); 5167 } 5168 5169 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 5170 { 5171 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); 5172 kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu); 5173 } 5174 5175 static void __disable_ibs_on_all_vcpus(struct kvm *kvm) 5176 { 5177 unsigned long i; 5178 struct kvm_vcpu *vcpu; 5179 5180 kvm_for_each_vcpu(i, vcpu, kvm) { 5181 __disable_ibs_on_vcpu(vcpu); 5182 } 5183 } 5184 5185 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 5186 { 5187 if (!sclp.has_ibs) 5188 return; 5189 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); 5190 kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu); 5191 } 5192 5193 int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) 5194 { 5195 int i, online_vcpus, r = 0, started_vcpus = 0; 5196 5197 if (!is_vcpu_stopped(vcpu)) 5198 return 0; 5199 5200 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); 5201 /* Only one cpu at a time may enter/leave the STOPPED state. */ 5202 spin_lock(&vcpu->kvm->arch.start_stop_lock); 5203 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 5204 5205 /* Let's tell the UV that we want to change into the operating state */ 5206 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5207 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR); 5208 if (r) { 5209 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5210 return r; 5211 } 5212 } 5213 5214 for (i = 0; i < online_vcpus; i++) { 5215 if (!is_vcpu_stopped(kvm_get_vcpu(vcpu->kvm, i))) 5216 started_vcpus++; 5217 } 5218 5219 if (started_vcpus == 0) { 5220 /* we're the only active VCPU -> speed it up */ 5221 __enable_ibs_on_vcpu(vcpu); 5222 } else if (started_vcpus == 1) { 5223 /* 5224 * As we are starting a second VCPU, we have to disable 5225 * the IBS facility on all VCPUs to remove potentially 5226 * outstanding ENABLE requests. 5227 */ 5228 __disable_ibs_on_all_vcpus(vcpu->kvm); 5229 } 5230 5231 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED); 5232 /* 5233 * The real PSW might have changed due to a RESTART interpreted by the 5234 * ultravisor. We block all interrupts and let the next sie exit 5235 * refresh our view. 5236 */ 5237 if (kvm_s390_pv_cpu_is_protected(vcpu)) 5238 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK; 5239 /* 5240 * Another VCPU might have used IBS while we were offline. 5241 * Let's play safe and flush the VCPU at startup. 5242 */ 5243 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 5244 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5245 return 0; 5246 } 5247 5248 int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) 5249 { 5250 int i, online_vcpus, r = 0, started_vcpus = 0; 5251 struct kvm_vcpu *started_vcpu = NULL; 5252 5253 if (is_vcpu_stopped(vcpu)) 5254 return 0; 5255 5256 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); 5257 /* Only one cpu at a time may enter/leave the STOPPED state. */ 5258 spin_lock(&vcpu->kvm->arch.start_stop_lock); 5259 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 5260 5261 /* Let's tell the UV that we want to change into the stopped state */ 5262 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5263 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP); 5264 if (r) { 5265 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5266 return r; 5267 } 5268 } 5269 5270 /* 5271 * Set the VCPU to STOPPED and THEN clear the interrupt flag, 5272 * now that the SIGP STOP and SIGP STOP AND STORE STATUS orders 5273 * have been fully processed. This will ensure that the VCPU 5274 * is kept BUSY if another VCPU is inquiring with SIGP SENSE. 5275 */ 5276 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED); 5277 kvm_s390_clear_stop_irq(vcpu); 5278 5279 __disable_ibs_on_vcpu(vcpu); 5280 5281 for (i = 0; i < online_vcpus; i++) { 5282 struct kvm_vcpu *tmp = kvm_get_vcpu(vcpu->kvm, i); 5283 5284 if (!is_vcpu_stopped(tmp)) { 5285 started_vcpus++; 5286 started_vcpu = tmp; 5287 } 5288 } 5289 5290 if (started_vcpus == 1) { 5291 /* 5292 * As we only have one VCPU left, we want to enable the 5293 * IBS facility for that VCPU to speed it up. 5294 */ 5295 __enable_ibs_on_vcpu(started_vcpu); 5296 } 5297 5298 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5299 return 0; 5300 } 5301 5302 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 5303 struct kvm_enable_cap *cap) 5304 { 5305 int r; 5306 5307 if (cap->flags) 5308 return -EINVAL; 5309 5310 switch (cap->cap) { 5311 case KVM_CAP_S390_CSS_SUPPORT: 5312 if (!vcpu->kvm->arch.css_support) { 5313 vcpu->kvm->arch.css_support = 1; 5314 VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support"); 5315 trace_kvm_s390_enable_css(vcpu->kvm); 5316 } 5317 r = 0; 5318 break; 5319 default: 5320 r = -EINVAL; 5321 break; 5322 } 5323 return r; 5324 } 5325 5326 static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu, 5327 struct kvm_s390_mem_op *mop) 5328 { 5329 void __user *uaddr = (void __user *)mop->buf; 5330 void *sida_addr; 5331 int r = 0; 5332 5333 if (mop->flags || !mop->size) 5334 return -EINVAL; 5335 if (mop->size + mop->sida_offset < mop->size) 5336 return -EINVAL; 5337 if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block)) 5338 return -E2BIG; 5339 if (!kvm_s390_pv_cpu_is_protected(vcpu)) 5340 return -EINVAL; 5341 5342 sida_addr = (char *)sida_addr(vcpu->arch.sie_block) + mop->sida_offset; 5343 5344 switch (mop->op) { 5345 case KVM_S390_MEMOP_SIDA_READ: 5346 if (copy_to_user(uaddr, sida_addr, mop->size)) 5347 r = -EFAULT; 5348 5349 break; 5350 case KVM_S390_MEMOP_SIDA_WRITE: 5351 if (copy_from_user(sida_addr, uaddr, mop->size)) 5352 r = -EFAULT; 5353 break; 5354 } 5355 return r; 5356 } 5357 5358 static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu, 5359 struct kvm_s390_mem_op *mop) 5360 { 5361 void __user *uaddr = (void __user *)mop->buf; 5362 void *tmpbuf __free(kvfree) = NULL; 5363 enum gacc_mode acc_mode; 5364 int r; 5365 5366 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_INJECT_EXCEPTION | 5367 KVM_S390_MEMOP_F_CHECK_ONLY | 5368 KVM_S390_MEMOP_F_SKEY_PROTECTION); 5369 if (r) 5370 return r; 5371 if (mop->ar >= NUM_ACRS) 5372 return -EINVAL; 5373 if (kvm_s390_pv_cpu_is_protected(vcpu)) 5374 return -EINVAL; 5375 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 5376 tmpbuf = vmalloc(mop->size); 5377 if (!tmpbuf) 5378 return -ENOMEM; 5379 } 5380 5381 acc_mode = mop->op == KVM_S390_MEMOP_LOGICAL_READ ? GACC_FETCH : GACC_STORE; 5382 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 5383 r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, 5384 acc_mode, mop->key); 5385 } else if (acc_mode == GACC_FETCH) { 5386 r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf, 5387 mop->size, mop->key); 5388 if (!r && copy_to_user(uaddr, tmpbuf, mop->size)) 5389 return -EFAULT; 5390 } else { 5391 if (copy_from_user(tmpbuf, uaddr, mop->size)) 5392 return -EFAULT; 5393 r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf, 5394 mop->size, mop->key); 5395 } 5396 5397 if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0) 5398 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 5399 5400 return r; 5401 } 5402 5403 static long kvm_s390_vcpu_memsida_op(struct kvm_vcpu *vcpu, 5404 struct kvm_s390_mem_op *mop) 5405 { 5406 int r, srcu_idx; 5407 5408 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 5409 5410 switch (mop->op) { 5411 case KVM_S390_MEMOP_LOGICAL_READ: 5412 case KVM_S390_MEMOP_LOGICAL_WRITE: 5413 r = kvm_s390_vcpu_mem_op(vcpu, mop); 5414 break; 5415 case KVM_S390_MEMOP_SIDA_READ: 5416 case KVM_S390_MEMOP_SIDA_WRITE: 5417 /* we are locked against sida going away by the vcpu->mutex */ 5418 r = kvm_s390_vcpu_sida_op(vcpu, mop); 5419 break; 5420 default: 5421 r = -EINVAL; 5422 } 5423 5424 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 5425 return r; 5426 } 5427 5428 long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, 5429 unsigned long arg) 5430 { 5431 struct kvm_vcpu *vcpu = filp->private_data; 5432 void __user *argp = (void __user *)arg; 5433 int rc; 5434 5435 switch (ioctl) { 5436 case KVM_S390_IRQ: { 5437 struct kvm_s390_irq s390irq; 5438 5439 if (copy_from_user(&s390irq, argp, sizeof(s390irq))) 5440 return -EFAULT; 5441 rc = kvm_s390_inject_vcpu(vcpu, &s390irq); 5442 break; 5443 } 5444 case KVM_S390_INTERRUPT: { 5445 struct kvm_s390_interrupt s390int; 5446 struct kvm_s390_irq s390irq = {}; 5447 5448 if (copy_from_user(&s390int, argp, sizeof(s390int))) 5449 return -EFAULT; 5450 if (s390int_to_s390irq(&s390int, &s390irq)) 5451 return -EINVAL; 5452 rc = kvm_s390_inject_vcpu(vcpu, &s390irq); 5453 break; 5454 } 5455 default: 5456 rc = -ENOIOCTLCMD; 5457 break; 5458 } 5459 5460 /* 5461 * To simplify single stepping of userspace-emulated instructions, 5462 * KVM_EXIT_S390_SIEIC exit sets KVM_GUESTDBG_EXIT_PENDING (see 5463 * should_handle_per_ifetch()). However, if userspace emulation injects 5464 * an interrupt, it needs to be cleared, so that KVM_EXIT_DEBUG happens 5465 * after (and not before) the interrupt delivery. 5466 */ 5467 if (!rc) 5468 vcpu->guest_debug &= ~KVM_GUESTDBG_EXIT_PENDING; 5469 5470 return rc; 5471 } 5472 5473 static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu, 5474 struct kvm_pv_cmd *cmd) 5475 { 5476 struct kvm_s390_pv_dmp dmp; 5477 void *data; 5478 int ret; 5479 5480 /* Dump initialization is a prerequisite */ 5481 if (!vcpu->kvm->arch.pv.dumping) 5482 return -EINVAL; 5483 5484 if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp))) 5485 return -EFAULT; 5486 5487 /* We only handle this subcmd right now */ 5488 if (dmp.subcmd != KVM_PV_DUMP_CPU) 5489 return -EINVAL; 5490 5491 /* CPU dump length is the same as create cpu storage donation. */ 5492 if (dmp.buff_len != uv_info.guest_cpu_stor_len) 5493 return -EINVAL; 5494 5495 data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL); 5496 if (!data) 5497 return -ENOMEM; 5498 5499 ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc); 5500 5501 VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x", 5502 vcpu->vcpu_id, cmd->rc, cmd->rrc); 5503 5504 if (ret) 5505 ret = -EINVAL; 5506 5507 /* On success copy over the dump data */ 5508 if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len)) 5509 ret = -EFAULT; 5510 5511 kvfree(data); 5512 return ret; 5513 } 5514 5515 long kvm_arch_vcpu_ioctl(struct file *filp, 5516 unsigned int ioctl, unsigned long arg) 5517 { 5518 struct kvm_vcpu *vcpu = filp->private_data; 5519 void __user *argp = (void __user *)arg; 5520 int idx; 5521 long r; 5522 u16 rc, rrc; 5523 5524 vcpu_load(vcpu); 5525 5526 switch (ioctl) { 5527 case KVM_S390_STORE_STATUS: 5528 idx = srcu_read_lock(&vcpu->kvm->srcu); 5529 r = kvm_s390_store_status_unloaded(vcpu, arg); 5530 srcu_read_unlock(&vcpu->kvm->srcu, idx); 5531 break; 5532 case KVM_S390_SET_INITIAL_PSW: { 5533 psw_t psw; 5534 5535 r = -EFAULT; 5536 if (copy_from_user(&psw, argp, sizeof(psw))) 5537 break; 5538 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); 5539 break; 5540 } 5541 case KVM_S390_CLEAR_RESET: 5542 r = 0; 5543 kvm_arch_vcpu_ioctl_clear_reset(vcpu); 5544 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5545 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), 5546 UVC_CMD_CPU_RESET_CLEAR, &rc, &rrc); 5547 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: rc %x rrc %x", 5548 rc, rrc); 5549 } 5550 break; 5551 case KVM_S390_INITIAL_RESET: 5552 r = 0; 5553 kvm_arch_vcpu_ioctl_initial_reset(vcpu); 5554 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5555 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), 5556 UVC_CMD_CPU_RESET_INITIAL, 5557 &rc, &rrc); 5558 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: rc %x rrc %x", 5559 rc, rrc); 5560 } 5561 break; 5562 case KVM_S390_NORMAL_RESET: 5563 r = 0; 5564 kvm_arch_vcpu_ioctl_normal_reset(vcpu); 5565 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5566 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), 5567 UVC_CMD_CPU_RESET, &rc, &rrc); 5568 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: rc %x rrc %x", 5569 rc, rrc); 5570 } 5571 break; 5572 case KVM_SET_ONE_REG: 5573 case KVM_GET_ONE_REG: { 5574 struct kvm_one_reg reg; 5575 r = -EINVAL; 5576 if (kvm_s390_pv_cpu_is_protected(vcpu)) 5577 break; 5578 r = -EFAULT; 5579 if (copy_from_user(®, argp, sizeof(reg))) 5580 break; 5581 if (ioctl == KVM_SET_ONE_REG) 5582 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); 5583 else 5584 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); 5585 break; 5586 } 5587 #ifdef CONFIG_KVM_S390_UCONTROL 5588 case KVM_S390_UCAS_MAP: { 5589 struct kvm_s390_ucas_mapping ucas; 5590 5591 r = -EFAULT; 5592 if (copy_from_user(&ucas, argp, sizeof(ucas))) 5593 break; 5594 5595 r = -EINVAL; 5596 if (!kvm_is_ucontrol(vcpu->kvm)) 5597 break; 5598 if (!IS_ALIGNED(ucas.user_addr | ucas.vcpu_addr | ucas.length, _SEGMENT_SIZE)) 5599 break; 5600 5601 r = gmap_ucas_map(vcpu->arch.gmap, gpa_to_gfn(ucas.user_addr), 5602 gpa_to_gfn(ucas.vcpu_addr), 5603 ucas.length >> _SEGMENT_SHIFT); 5604 break; 5605 } 5606 case KVM_S390_UCAS_UNMAP: { 5607 struct kvm_s390_ucas_mapping ucas; 5608 5609 r = -EFAULT; 5610 if (copy_from_user(&ucas, argp, sizeof(ucas))) 5611 break; 5612 5613 r = -EINVAL; 5614 if (!kvm_is_ucontrol(vcpu->kvm)) 5615 break; 5616 if (!IS_ALIGNED(ucas.vcpu_addr | ucas.length, _SEGMENT_SIZE)) 5617 break; 5618 5619 gmap_ucas_unmap(vcpu->arch.gmap, gpa_to_gfn(ucas.vcpu_addr), 5620 ucas.length >> _SEGMENT_SHIFT); 5621 r = 0; 5622 break; 5623 } 5624 #endif 5625 case KVM_S390_VCPU_FAULT: { 5626 gpa_t gaddr = arg; 5627 5628 scoped_guard(srcu, &vcpu->kvm->srcu) { 5629 r = vcpu_ucontrol_translate(vcpu, &gaddr); 5630 if (r) 5631 break; 5632 5633 r = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(gaddr), false); 5634 if (r == PGM_ADDRESSING) 5635 r = -EFAULT; 5636 if (r <= 0) 5637 break; 5638 r = -EIO; 5639 KVM_BUG_ON(r, vcpu->kvm); 5640 } 5641 break; 5642 } 5643 case KVM_ENABLE_CAP: 5644 { 5645 struct kvm_enable_cap cap; 5646 r = -EFAULT; 5647 if (copy_from_user(&cap, argp, sizeof(cap))) 5648 break; 5649 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 5650 break; 5651 } 5652 case KVM_S390_MEM_OP: { 5653 struct kvm_s390_mem_op mem_op; 5654 5655 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 5656 r = kvm_s390_vcpu_memsida_op(vcpu, &mem_op); 5657 else 5658 r = -EFAULT; 5659 break; 5660 } 5661 case KVM_S390_SET_IRQ_STATE: { 5662 struct kvm_s390_irq_state irq_state; 5663 5664 r = -EFAULT; 5665 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 5666 break; 5667 if (irq_state.len > VCPU_IRQS_MAX_BUF || 5668 irq_state.len == 0 || 5669 irq_state.len % sizeof(struct kvm_s390_irq) > 0) { 5670 r = -EINVAL; 5671 break; 5672 } 5673 /* do not use irq_state.flags, it will break old QEMUs */ 5674 r = kvm_s390_set_irq_state(vcpu, 5675 (void __user *) irq_state.buf, 5676 irq_state.len); 5677 break; 5678 } 5679 case KVM_S390_GET_IRQ_STATE: { 5680 struct kvm_s390_irq_state irq_state; 5681 5682 r = -EFAULT; 5683 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 5684 break; 5685 if (irq_state.len == 0) { 5686 r = -EINVAL; 5687 break; 5688 } 5689 /* do not use irq_state.flags, it will break old QEMUs */ 5690 r = kvm_s390_get_irq_state(vcpu, 5691 (__u8 __user *) irq_state.buf, 5692 irq_state.len); 5693 break; 5694 } 5695 case KVM_S390_PV_CPU_COMMAND: { 5696 struct kvm_pv_cmd cmd; 5697 5698 r = -EINVAL; 5699 if (!is_prot_virt_host()) 5700 break; 5701 5702 r = -EFAULT; 5703 if (copy_from_user(&cmd, argp, sizeof(cmd))) 5704 break; 5705 5706 r = -EINVAL; 5707 if (cmd.flags) 5708 break; 5709 5710 /* We only handle this cmd right now */ 5711 if (cmd.cmd != KVM_PV_DUMP) 5712 break; 5713 5714 r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd); 5715 5716 /* Always copy over UV rc / rrc data */ 5717 if (copy_to_user((__u8 __user *)argp, &cmd.rc, 5718 sizeof(cmd.rc) + sizeof(cmd.rrc))) 5719 r = -EFAULT; 5720 break; 5721 } 5722 default: 5723 r = -ENOTTY; 5724 } 5725 5726 vcpu_put(vcpu); 5727 return r; 5728 } 5729 5730 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 5731 { 5732 #ifdef CONFIG_KVM_S390_UCONTROL 5733 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) 5734 && (kvm_is_ucontrol(vcpu->kvm))) { 5735 vmf->page = virt_to_page(vcpu->arch.sie_block); 5736 get_page(vmf->page); 5737 return 0; 5738 } 5739 #endif 5740 return VM_FAULT_SIGBUS; 5741 } 5742 5743 bool kvm_arch_irqchip_in_kernel(struct kvm *kvm) 5744 { 5745 return true; 5746 } 5747 5748 /* Section: memory related */ 5749 int kvm_arch_prepare_memory_region(struct kvm *kvm, 5750 const struct kvm_memory_slot *old, 5751 struct kvm_memory_slot *new, 5752 enum kvm_mr_change change) 5753 { 5754 if (kvm_is_ucontrol(kvm) && new && new->id < KVM_USER_MEM_SLOTS) 5755 return -EINVAL; 5756 5757 /* When we are protected, we should not change the memory slots */ 5758 if (kvm_s390_pv_get_handle(kvm)) 5759 return -EINVAL; 5760 5761 if (change != KVM_MR_DELETE && change != KVM_MR_FLAGS_ONLY) { 5762 /* 5763 * A few sanity checks. The memory in userland is ok to be 5764 * fragmented into various different vmas. It is okay to mmap() 5765 * and munmap() stuff in this slot after doing this call at any 5766 * time. 5767 */ 5768 if (new->userspace_addr & ~PAGE_MASK) 5769 return -EINVAL; 5770 if ((new->base_gfn + new->npages) * PAGE_SIZE > kvm->arch.mem_limit) 5771 return -EINVAL; 5772 if (!asce_contains_gfn(kvm->arch.gmap->asce, new->base_gfn + new->npages - 1)) 5773 return -EINVAL; 5774 } 5775 5776 if (!kvm->arch.migration_mode) 5777 return 0; 5778 5779 /* 5780 * Turn off migration mode when: 5781 * - userspace creates a new memslot with dirty logging off, 5782 * - userspace modifies an existing memslot (MOVE or FLAGS_ONLY) and 5783 * dirty logging is turned off. 5784 * Migration mode expects dirty page logging being enabled to store 5785 * its dirty bitmap. 5786 */ 5787 if (change != KVM_MR_DELETE && 5788 !(new->flags & KVM_MEM_LOG_DIRTY_PAGES)) 5789 WARN(kvm_s390_vm_stop_migration(kvm), 5790 "Failed to stop migration mode"); 5791 5792 return 0; 5793 } 5794 5795 void kvm_arch_commit_memory_region(struct kvm *kvm, 5796 struct kvm_memory_slot *old, 5797 const struct kvm_memory_slot *new, 5798 enum kvm_mr_change change) 5799 { 5800 struct kvm_s390_mmu_cache *mc = NULL; 5801 int rc = 0; 5802 5803 if (change == KVM_MR_FLAGS_ONLY) 5804 return; 5805 5806 mc = kvm_s390_new_mmu_cache(); 5807 if (!mc) { 5808 rc = -ENOMEM; 5809 goto out; 5810 } 5811 5812 scoped_guard(write_lock, &kvm->mmu_lock) { 5813 switch (change) { 5814 case KVM_MR_DELETE: 5815 rc = dat_delete_slot(mc, kvm->arch.gmap->asce, old->base_gfn, old->npages); 5816 break; 5817 case KVM_MR_MOVE: 5818 rc = dat_delete_slot(mc, kvm->arch.gmap->asce, old->base_gfn, old->npages); 5819 if (rc) 5820 break; 5821 fallthrough; 5822 case KVM_MR_CREATE: 5823 rc = dat_create_slot(mc, kvm->arch.gmap->asce, new->base_gfn, new->npages); 5824 break; 5825 case KVM_MR_FLAGS_ONLY: 5826 break; 5827 default: 5828 WARN(1, "Unknown KVM MR CHANGE: %d\n", change); 5829 } 5830 } 5831 out: 5832 if (rc) 5833 pr_warn("failed to commit memory region\n"); 5834 kvm_s390_free_mmu_cache(mc); 5835 return; 5836 } 5837 5838 /** 5839 * kvm_arch_vcpu_pre_fault_memory() -- pre-fault and link gmap dat tables 5840 * @vcpu: the vcpu that shall appear to have generated the fault-in. 5841 * @range: the range that needs to be faulted in. 5842 * 5843 * The first page of the given range is faulted in and the corresponding gmap 5844 * page tables are created, as if the given vCPU had performed a read 5845 * operation. 5846 * If the range starts outside any memslots, an error is returned. An error is 5847 * also returned for UCONTROL VMs, which should instead use the 5848 * KVM_S390_VCPU_FAULT ioctl. 5849 * 5850 * Return: 5851 * * %-ENOENT if the range lies outside of a memslot. 5852 * * %-EINVAL in case of invalid state (for example if the VM is UCONTROL). 5853 * * %-EIO if errors happen while faulting-in the page (will trigger a warning 5854 * in the caller). 5855 * * other error codes < 0 in case of other errors. 5856 * * otherwise a number > 0 of bytes that have been faulted in successfully. 5857 */ 5858 long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu, struct kvm_pre_fault_memory *range) 5859 { 5860 struct guest_fault f = { .gfn = gpa_to_gfn(range->gpa), }; 5861 gpa_t end; 5862 int rc; 5863 5864 if (kvm_is_ucontrol(vcpu->kvm)) 5865 return -EINVAL; 5866 5867 rc = kvm_s390_faultin_gfn(vcpu, NULL, &f); 5868 if (rc == PGM_ADDRESSING) 5869 return -ENOENT; 5870 if (rc > 0) 5871 return -EIO; 5872 if (rc < 0) 5873 return rc; 5874 5875 if (f.ptep) 5876 return PAGE_SIZE; 5877 5878 end = ALIGN(range->gpa + PAGE_SIZE, f.crste_region3 ? _REGION3_SIZE : HPAGE_SIZE); 5879 return min(range->size, end - range->gpa); 5880 } 5881 5882 /** 5883 * kvm_test_age_gfn() - test young 5884 * @kvm: the kvm instance 5885 * @range: the range of guest addresses whose young status needs to be cleared 5886 * 5887 * Context: called by KVM common code without holding the kvm mmu lock 5888 * Return: true if any page in the given range is young, otherwise 0. 5889 */ 5890 bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) 5891 { 5892 scoped_guard(read_lock, &kvm->mmu_lock) 5893 return dat_test_age_gfn(kvm->arch.gmap->asce, range->start, range->end); 5894 } 5895 5896 /** 5897 * kvm_age_gfn() - clear young 5898 * @kvm: the kvm instance 5899 * @range: the range of guest addresses whose young status needs to be cleared 5900 * 5901 * Context: called by KVM common code without holding the kvm mmu lock 5902 * Return: true if any page in the given range was young, otherwise 0. 5903 */ 5904 bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) 5905 { 5906 scoped_guard(read_lock, &kvm->mmu_lock) 5907 return gmap_age_gfn(kvm->arch.gmap, range->start, range->end); 5908 } 5909 5910 /** 5911 * kvm_unmap_gfn_range() - Unmap a range of guest addresses 5912 * @kvm: the kvm instance 5913 * @range: the range of guest page frames to invalidate 5914 * 5915 * This function always returns false because every DAT table modification 5916 * has to use the appropriate DAT table manipulation instructions, which will 5917 * keep the TLB coherent, hence no additional TLB flush is ever required. 5918 * 5919 * Context: called by KVM common code with the kvm mmu write lock held 5920 * Return: false 5921 */ 5922 bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) 5923 { 5924 return gmap_unmap_gfn_range(kvm->arch.gmap, range->slot, range->start, range->end); 5925 } 5926 5927 static inline unsigned long nonhyp_mask(int i) 5928 { 5929 unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30; 5930 5931 return 0x0000ffffffffffffUL >> (nonhyp_fai << 4); 5932 } 5933 5934 static int __init kvm_s390_init(void) 5935 { 5936 int i, r; 5937 5938 if (!sclp.has_sief2) { 5939 pr_info("SIE is not available\n"); 5940 return -ENODEV; 5941 } 5942 5943 if (hpage_2g && !hpage) { 5944 hpage_2g = 0; 5945 pr_info("Disabling 2G hugepage support, since 1M hugepage support is not enabled.\n"); 5946 } 5947 5948 for (i = 0; i < HMFAI_DWORDS; i++) 5949 kvm_s390_fac_base[i] |= nonhyp_mask(i); 5950 5951 r = __kvm_s390_init(); 5952 if (r) 5953 return r; 5954 5955 r = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE); 5956 if (r) { 5957 __kvm_s390_exit(); 5958 return r; 5959 } 5960 return 0; 5961 } 5962 5963 static void __exit kvm_s390_exit(void) 5964 { 5965 kvm_exit(); 5966 5967 __kvm_s390_exit(); 5968 } 5969 5970 module_init(kvm_s390_init); 5971 module_exit(kvm_s390_exit); 5972 5973 /* 5974 * Enable autoloading of the kvm module. 5975 * Note that we add the module alias here instead of virt/kvm/kvm_main.c 5976 * since x86 takes a different approach. 5977 */ 5978 #include <linux/miscdevice.h> 5979 MODULE_ALIAS_MISCDEV(KVM_MINOR); 5980 MODULE_ALIAS("devname:kvm"); 5981