1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * kvm nested virtualization support for s390x 4 * 5 * Copyright IBM Corp. 2016 6 * 7 * Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com> 8 */ 9 #include <linux/vmalloc.h> 10 #include <linux/kvm_host.h> 11 #include <linux/bug.h> 12 #include <linux/list.h> 13 #include <linux/bitmap.h> 14 #include <linux/sched/signal.h> 15 16 #include <asm/gmap.h> 17 #include <asm/mmu_context.h> 18 #include <asm/sclp.h> 19 #include <asm/nmi.h> 20 #include <asm/dis.h> 21 #include "kvm-s390.h" 22 #include "gaccess.h" 23 24 struct vsie_page { 25 struct kvm_s390_sie_block scb_s; /* 0x0000 */ 26 /* 27 * the backup info for machine check. ensure it's at 28 * the same offset as that in struct sie_page! 29 */ 30 struct mcck_volatile_info mcck_info; /* 0x0200 */ 31 /* 32 * The pinned original scb. Be aware that other VCPUs can modify 33 * it while we read from it. Values that are used for conditions or 34 * are reused conditionally, should be accessed via READ_ONCE. 35 */ 36 struct kvm_s390_sie_block *scb_o; /* 0x0218 */ 37 /* the shadow gmap in use by the vsie_page */ 38 struct gmap *gmap; /* 0x0220 */ 39 /* address of the last reported fault to guest2 */ 40 unsigned long fault_addr; /* 0x0228 */ 41 /* calculated guest addresses of satellite control blocks */ 42 gpa_t sca_gpa; /* 0x0230 */ 43 gpa_t itdba_gpa; /* 0x0238 */ 44 gpa_t gvrd_gpa; /* 0x0240 */ 45 gpa_t riccbd_gpa; /* 0x0248 */ 46 gpa_t sdnx_gpa; /* 0x0250 */ 47 __u8 reserved[0x0700 - 0x0258]; /* 0x0258 */ 48 struct kvm_s390_crypto_cb crycb; /* 0x0700 */ 49 __u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE]; /* 0x0800 */ 50 }; 51 52 /* trigger a validity icpt for the given scb */ 53 static int set_validity_icpt(struct kvm_s390_sie_block *scb, 54 __u16 reason_code) 55 { 56 scb->ipa = 0x1000; 57 scb->ipb = ((__u32) reason_code) << 16; 58 scb->icptcode = ICPT_VALIDITY; 59 return 1; 60 } 61 62 /* mark the prefix as unmapped, this will block the VSIE */ 63 static void prefix_unmapped(struct vsie_page *vsie_page) 64 { 65 atomic_or(PROG_REQUEST, &vsie_page->scb_s.prog20); 66 } 67 68 /* mark the prefix as unmapped and wait until the VSIE has been left */ 69 static void prefix_unmapped_sync(struct vsie_page *vsie_page) 70 { 71 prefix_unmapped(vsie_page); 72 if (vsie_page->scb_s.prog0c & PROG_IN_SIE) 73 atomic_or(CPUSTAT_STOP_INT, &vsie_page->scb_s.cpuflags); 74 while (vsie_page->scb_s.prog0c & PROG_IN_SIE) 75 cpu_relax(); 76 } 77 78 /* mark the prefix as mapped, this will allow the VSIE to run */ 79 static void prefix_mapped(struct vsie_page *vsie_page) 80 { 81 atomic_andnot(PROG_REQUEST, &vsie_page->scb_s.prog20); 82 } 83 84 /* test if the prefix is mapped into the gmap shadow */ 85 static int prefix_is_mapped(struct vsie_page *vsie_page) 86 { 87 return !(atomic_read(&vsie_page->scb_s.prog20) & PROG_REQUEST); 88 } 89 90 /* copy the updated intervention request bits into the shadow scb */ 91 static void update_intervention_requests(struct vsie_page *vsie_page) 92 { 93 const int bits = CPUSTAT_STOP_INT | CPUSTAT_IO_INT | CPUSTAT_EXT_INT; 94 int cpuflags; 95 96 cpuflags = atomic_read(&vsie_page->scb_o->cpuflags); 97 atomic_andnot(bits, &vsie_page->scb_s.cpuflags); 98 atomic_or(cpuflags & bits, &vsie_page->scb_s.cpuflags); 99 } 100 101 /* shadow (filter and validate) the cpuflags */ 102 static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 103 { 104 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 105 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; 106 int newflags, cpuflags = atomic_read(&scb_o->cpuflags); 107 108 /* we don't allow ESA/390 guests */ 109 if (!(cpuflags & CPUSTAT_ZARCH)) 110 return set_validity_icpt(scb_s, 0x0001U); 111 112 if (cpuflags & (CPUSTAT_RRF | CPUSTAT_MCDS)) 113 return set_validity_icpt(scb_s, 0x0001U); 114 else if (cpuflags & (CPUSTAT_SLSV | CPUSTAT_SLSR)) 115 return set_validity_icpt(scb_s, 0x0007U); 116 117 /* intervention requests will be set later */ 118 newflags = CPUSTAT_ZARCH; 119 if (cpuflags & CPUSTAT_GED && test_kvm_facility(vcpu->kvm, 8)) 120 newflags |= CPUSTAT_GED; 121 if (cpuflags & CPUSTAT_GED2 && test_kvm_facility(vcpu->kvm, 78)) { 122 if (cpuflags & CPUSTAT_GED) 123 return set_validity_icpt(scb_s, 0x0001U); 124 newflags |= CPUSTAT_GED2; 125 } 126 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GPERE)) 127 newflags |= cpuflags & CPUSTAT_P; 128 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GSLS)) 129 newflags |= cpuflags & CPUSTAT_SM; 130 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IBS)) 131 newflags |= cpuflags & CPUSTAT_IBS; 132 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_KSS)) 133 newflags |= cpuflags & CPUSTAT_KSS; 134 135 atomic_set(&scb_s->cpuflags, newflags); 136 return 0; 137 } 138 139 /* 140 * Create a shadow copy of the crycb block and setup key wrapping, if 141 * requested for guest 3 and enabled for guest 2. 142 * 143 * We only accept format-1 (no AP in g2), but convert it into format-2 144 * There is nothing to do for format-0. 145 * 146 * Returns: - 0 if shadowed or nothing to do 147 * - > 0 if control has to be given to guest 2 148 */ 149 static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 150 { 151 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 152 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; 153 const uint32_t crycbd_o = READ_ONCE(scb_o->crycbd); 154 const u32 crycb_addr = crycbd_o & 0x7ffffff8U; 155 unsigned long *b1, *b2; 156 u8 ecb3_flags; 157 158 scb_s->crycbd = 0; 159 if (!(crycbd_o & vcpu->arch.sie_block->crycbd & CRYCB_FORMAT1)) 160 return 0; 161 /* format-1 is supported with message-security-assist extension 3 */ 162 if (!test_kvm_facility(vcpu->kvm, 76)) 163 return 0; 164 /* we may only allow it if enabled for guest 2 */ 165 ecb3_flags = scb_o->ecb3 & vcpu->arch.sie_block->ecb3 & 166 (ECB3_AES | ECB3_DEA); 167 if (!ecb3_flags) 168 return 0; 169 170 if ((crycb_addr & PAGE_MASK) != ((crycb_addr + 128) & PAGE_MASK)) 171 return set_validity_icpt(scb_s, 0x003CU); 172 else if (!crycb_addr) 173 return set_validity_icpt(scb_s, 0x0039U); 174 175 /* copy only the wrapping keys */ 176 if (read_guest_real(vcpu, crycb_addr + 72, &vsie_page->crycb, 56)) 177 return set_validity_icpt(scb_s, 0x0035U); 178 179 scb_s->ecb3 |= ecb3_flags; 180 scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT1 | 181 CRYCB_FORMAT2; 182 183 /* xor both blocks in one run */ 184 b1 = (unsigned long *) vsie_page->crycb.dea_wrapping_key_mask; 185 b2 = (unsigned long *) 186 vcpu->kvm->arch.crypto.crycb->dea_wrapping_key_mask; 187 /* as 56%8 == 0, bitmap_xor won't overwrite any data */ 188 bitmap_xor(b1, b1, b2, BITS_PER_BYTE * 56); 189 return 0; 190 } 191 192 /* shadow (round up/down) the ibc to avoid validity icpt */ 193 static void prepare_ibc(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 194 { 195 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 196 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; 197 /* READ_ONCE does not work on bitfields - use a temporary variable */ 198 const uint32_t __new_ibc = scb_o->ibc; 199 const uint32_t new_ibc = READ_ONCE(__new_ibc) & 0x0fffU; 200 __u64 min_ibc = (sclp.ibc >> 16) & 0x0fffU; 201 202 scb_s->ibc = 0; 203 /* ibc installed in g2 and requested for g3 */ 204 if (vcpu->kvm->arch.model.ibc && new_ibc) { 205 scb_s->ibc = new_ibc; 206 /* takte care of the minimum ibc level of the machine */ 207 if (scb_s->ibc < min_ibc) 208 scb_s->ibc = min_ibc; 209 /* take care of the maximum ibc level set for the guest */ 210 if (scb_s->ibc > vcpu->kvm->arch.model.ibc) 211 scb_s->ibc = vcpu->kvm->arch.model.ibc; 212 } 213 } 214 215 /* unshadow the scb, copying parameters back to the real scb */ 216 static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 217 { 218 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 219 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; 220 221 /* interception */ 222 scb_o->icptcode = scb_s->icptcode; 223 scb_o->icptstatus = scb_s->icptstatus; 224 scb_o->ipa = scb_s->ipa; 225 scb_o->ipb = scb_s->ipb; 226 scb_o->gbea = scb_s->gbea; 227 228 /* timer */ 229 scb_o->cputm = scb_s->cputm; 230 scb_o->ckc = scb_s->ckc; 231 scb_o->todpr = scb_s->todpr; 232 233 /* guest state */ 234 scb_o->gpsw = scb_s->gpsw; 235 scb_o->gg14 = scb_s->gg14; 236 scb_o->gg15 = scb_s->gg15; 237 memcpy(scb_o->gcr, scb_s->gcr, 128); 238 scb_o->pp = scb_s->pp; 239 240 /* branch prediction */ 241 if (test_kvm_facility(vcpu->kvm, 82)) { 242 scb_o->fpf &= ~FPF_BPBC; 243 scb_o->fpf |= scb_s->fpf & FPF_BPBC; 244 } 245 246 /* interrupt intercept */ 247 switch (scb_s->icptcode) { 248 case ICPT_PROGI: 249 case ICPT_INSTPROGI: 250 case ICPT_EXTINT: 251 memcpy((void *)((u64)scb_o + 0xc0), 252 (void *)((u64)scb_s + 0xc0), 0xf0 - 0xc0); 253 break; 254 case ICPT_PARTEXEC: 255 /* MVPG only */ 256 memcpy((void *)((u64)scb_o + 0xc0), 257 (void *)((u64)scb_s + 0xc0), 0xd0 - 0xc0); 258 break; 259 } 260 261 if (scb_s->ihcpu != 0xffffU) 262 scb_o->ihcpu = scb_s->ihcpu; 263 } 264 265 /* 266 * Setup the shadow scb by copying and checking the relevant parts of the g2 267 * provided scb. 268 * 269 * Returns: - 0 if the scb has been shadowed 270 * - > 0 if control has to be given to guest 2 271 */ 272 static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 273 { 274 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; 275 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 276 /* READ_ONCE does not work on bitfields - use a temporary variable */ 277 const uint32_t __new_prefix = scb_o->prefix; 278 const uint32_t new_prefix = READ_ONCE(__new_prefix); 279 const bool wants_tx = READ_ONCE(scb_o->ecb) & ECB_TE; 280 bool had_tx = scb_s->ecb & ECB_TE; 281 unsigned long new_mso = 0; 282 int rc; 283 284 /* make sure we don't have any leftovers when reusing the scb */ 285 scb_s->icptcode = 0; 286 scb_s->eca = 0; 287 scb_s->ecb = 0; 288 scb_s->ecb2 = 0; 289 scb_s->ecb3 = 0; 290 scb_s->ecd = 0; 291 scb_s->fac = 0; 292 scb_s->fpf = 0; 293 294 rc = prepare_cpuflags(vcpu, vsie_page); 295 if (rc) 296 goto out; 297 298 /* timer */ 299 scb_s->cputm = scb_o->cputm; 300 scb_s->ckc = scb_o->ckc; 301 scb_s->todpr = scb_o->todpr; 302 scb_s->epoch = scb_o->epoch; 303 304 /* guest state */ 305 scb_s->gpsw = scb_o->gpsw; 306 scb_s->gg14 = scb_o->gg14; 307 scb_s->gg15 = scb_o->gg15; 308 memcpy(scb_s->gcr, scb_o->gcr, 128); 309 scb_s->pp = scb_o->pp; 310 311 /* interception / execution handling */ 312 scb_s->gbea = scb_o->gbea; 313 scb_s->lctl = scb_o->lctl; 314 scb_s->svcc = scb_o->svcc; 315 scb_s->ictl = scb_o->ictl; 316 /* 317 * SKEY handling functions can't deal with false setting of PTE invalid 318 * bits. Therefore we cannot provide interpretation and would later 319 * have to provide own emulation handlers. 320 */ 321 if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_KSS)) 322 scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 323 324 scb_s->icpua = scb_o->icpua; 325 326 if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_SM)) 327 new_mso = READ_ONCE(scb_o->mso) & 0xfffffffffff00000UL; 328 /* if the hva of the prefix changes, we have to remap the prefix */ 329 if (scb_s->mso != new_mso || scb_s->prefix != new_prefix) 330 prefix_unmapped(vsie_page); 331 /* SIE will do mso/msl validity and exception checks for us */ 332 scb_s->msl = scb_o->msl & 0xfffffffffff00000UL; 333 scb_s->mso = new_mso; 334 scb_s->prefix = new_prefix; 335 336 /* We have to definetly flush the tlb if this scb never ran */ 337 if (scb_s->ihcpu != 0xffffU) 338 scb_s->ihcpu = scb_o->ihcpu; 339 340 /* MVPG and Protection Exception Interpretation are always available */ 341 scb_s->eca |= scb_o->eca & (ECA_MVPGI | ECA_PROTEXCI); 342 /* Host-protection-interruption introduced with ESOP */ 343 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_ESOP)) 344 scb_s->ecb |= scb_o->ecb & ECB_HOSTPROTINT; 345 /* transactional execution */ 346 if (test_kvm_facility(vcpu->kvm, 73) && wants_tx) { 347 /* remap the prefix is tx is toggled on */ 348 if (!had_tx) 349 prefix_unmapped(vsie_page); 350 scb_s->ecb |= ECB_TE; 351 } 352 /* branch prediction */ 353 if (test_kvm_facility(vcpu->kvm, 82)) 354 scb_s->fpf |= scb_o->fpf & FPF_BPBC; 355 /* SIMD */ 356 if (test_kvm_facility(vcpu->kvm, 129)) { 357 scb_s->eca |= scb_o->eca & ECA_VX; 358 scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT; 359 } 360 /* Run-time-Instrumentation */ 361 if (test_kvm_facility(vcpu->kvm, 64)) 362 scb_s->ecb3 |= scb_o->ecb3 & ECB3_RI; 363 /* Instruction Execution Prevention */ 364 if (test_kvm_facility(vcpu->kvm, 130)) 365 scb_s->ecb2 |= scb_o->ecb2 & ECB2_IEP; 366 /* Guarded Storage */ 367 if (test_kvm_facility(vcpu->kvm, 133)) { 368 scb_s->ecb |= scb_o->ecb & ECB_GS; 369 scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT; 370 } 371 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF)) 372 scb_s->eca |= scb_o->eca & ECA_SII; 373 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IB)) 374 scb_s->eca |= scb_o->eca & ECA_IB; 375 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI)) 376 scb_s->eca |= scb_o->eca & ECA_CEI; 377 /* Epoch Extension */ 378 if (test_kvm_facility(vcpu->kvm, 139)) 379 scb_s->ecd |= scb_o->ecd & ECD_MEF; 380 381 prepare_ibc(vcpu, vsie_page); 382 rc = shadow_crycb(vcpu, vsie_page); 383 out: 384 if (rc) 385 unshadow_scb(vcpu, vsie_page); 386 return rc; 387 } 388 389 void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start, 390 unsigned long end) 391 { 392 struct kvm *kvm = gmap->private; 393 struct vsie_page *cur; 394 unsigned long prefix; 395 struct page *page; 396 int i; 397 398 if (!gmap_is_shadow(gmap)) 399 return; 400 if (start >= 1UL << 31) 401 /* We are only interested in prefix pages */ 402 return; 403 404 /* 405 * Only new shadow blocks are added to the list during runtime, 406 * therefore we can safely reference them all the time. 407 */ 408 for (i = 0; i < kvm->arch.vsie.page_count; i++) { 409 page = READ_ONCE(kvm->arch.vsie.pages[i]); 410 if (!page) 411 continue; 412 cur = page_to_virt(page); 413 if (READ_ONCE(cur->gmap) != gmap) 414 continue; 415 prefix = cur->scb_s.prefix << GUEST_PREFIX_SHIFT; 416 /* with mso/msl, the prefix lies at an offset */ 417 prefix += cur->scb_s.mso; 418 if (prefix <= end && start <= prefix + 2 * PAGE_SIZE - 1) 419 prefix_unmapped_sync(cur); 420 } 421 } 422 423 /* 424 * Map the first prefix page and if tx is enabled also the second prefix page. 425 * 426 * The prefix will be protected, a gmap notifier will inform about unmaps. 427 * The shadow scb must not be executed until the prefix is remapped, this is 428 * guaranteed by properly handling PROG_REQUEST. 429 * 430 * Returns: - 0 on if successfully mapped or already mapped 431 * - > 0 if control has to be given to guest 2 432 * - -EAGAIN if the caller can retry immediately 433 * - -ENOMEM if out of memory 434 */ 435 static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 436 { 437 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 438 u64 prefix = scb_s->prefix << GUEST_PREFIX_SHIFT; 439 int rc; 440 441 if (prefix_is_mapped(vsie_page)) 442 return 0; 443 444 /* mark it as mapped so we can catch any concurrent unmappers */ 445 prefix_mapped(vsie_page); 446 447 /* with mso/msl, the prefix lies at offset *mso* */ 448 prefix += scb_s->mso; 449 450 rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, prefix); 451 if (!rc && (scb_s->ecb & ECB_TE)) 452 rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, 453 prefix + PAGE_SIZE); 454 /* 455 * We don't have to mprotect, we will be called for all unshadows. 456 * SIE will detect if protection applies and trigger a validity. 457 */ 458 if (rc) 459 prefix_unmapped(vsie_page); 460 if (rc > 0 || rc == -EFAULT) 461 rc = set_validity_icpt(scb_s, 0x0037U); 462 return rc; 463 } 464 465 /* 466 * Pin the guest page given by gpa and set hpa to the pinned host address. 467 * Will always be pinned writable. 468 * 469 * Returns: - 0 on success 470 * - -EINVAL if the gpa is not valid guest storage 471 */ 472 static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa) 473 { 474 struct page *page; 475 476 page = gfn_to_page(kvm, gpa_to_gfn(gpa)); 477 if (is_error_page(page)) 478 return -EINVAL; 479 *hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK); 480 return 0; 481 } 482 483 /* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */ 484 static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa) 485 { 486 kvm_release_pfn_dirty(hpa >> PAGE_SHIFT); 487 /* mark the page always as dirty for migration */ 488 mark_page_dirty(kvm, gpa_to_gfn(gpa)); 489 } 490 491 /* unpin all blocks previously pinned by pin_blocks(), marking them dirty */ 492 static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 493 { 494 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 495 hpa_t hpa; 496 497 hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol; 498 if (hpa) { 499 unpin_guest_page(vcpu->kvm, vsie_page->sca_gpa, hpa); 500 vsie_page->sca_gpa = 0; 501 scb_s->scaol = 0; 502 scb_s->scaoh = 0; 503 } 504 505 hpa = scb_s->itdba; 506 if (hpa) { 507 unpin_guest_page(vcpu->kvm, vsie_page->itdba_gpa, hpa); 508 vsie_page->itdba_gpa = 0; 509 scb_s->itdba = 0; 510 } 511 512 hpa = scb_s->gvrd; 513 if (hpa) { 514 unpin_guest_page(vcpu->kvm, vsie_page->gvrd_gpa, hpa); 515 vsie_page->gvrd_gpa = 0; 516 scb_s->gvrd = 0; 517 } 518 519 hpa = scb_s->riccbd; 520 if (hpa) { 521 unpin_guest_page(vcpu->kvm, vsie_page->riccbd_gpa, hpa); 522 vsie_page->riccbd_gpa = 0; 523 scb_s->riccbd = 0; 524 } 525 526 hpa = scb_s->sdnxo; 527 if (hpa) { 528 unpin_guest_page(vcpu->kvm, vsie_page->sdnx_gpa, hpa); 529 vsie_page->sdnx_gpa = 0; 530 scb_s->sdnxo = 0; 531 } 532 } 533 534 /* 535 * Instead of shadowing some blocks, we can simply forward them because the 536 * addresses in the scb are 64 bit long. 537 * 538 * This works as long as the data lies in one page. If blocks ever exceed one 539 * page, we have to fall back to shadowing. 540 * 541 * As we reuse the sca, the vcpu pointers contained in it are invalid. We must 542 * therefore not enable any facilities that access these pointers (e.g. SIGPIF). 543 * 544 * Returns: - 0 if all blocks were pinned. 545 * - > 0 if control has to be given to guest 2 546 * - -ENOMEM if out of memory 547 */ 548 static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 549 { 550 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; 551 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 552 hpa_t hpa; 553 gpa_t gpa; 554 int rc = 0; 555 556 gpa = READ_ONCE(scb_o->scaol) & ~0xfUL; 557 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO)) 558 gpa |= (u64) READ_ONCE(scb_o->scaoh) << 32; 559 if (gpa) { 560 if (!(gpa & ~0x1fffUL)) 561 rc = set_validity_icpt(scb_s, 0x0038U); 562 else if ((gpa & ~0x1fffUL) == kvm_s390_get_prefix(vcpu)) 563 rc = set_validity_icpt(scb_s, 0x0011U); 564 else if ((gpa & PAGE_MASK) != 565 ((gpa + sizeof(struct bsca_block) - 1) & PAGE_MASK)) 566 rc = set_validity_icpt(scb_s, 0x003bU); 567 if (!rc) { 568 rc = pin_guest_page(vcpu->kvm, gpa, &hpa); 569 if (rc) 570 rc = set_validity_icpt(scb_s, 0x0034U); 571 } 572 if (rc) 573 goto unpin; 574 vsie_page->sca_gpa = gpa; 575 scb_s->scaoh = (u32)((u64)hpa >> 32); 576 scb_s->scaol = (u32)(u64)hpa; 577 } 578 579 gpa = READ_ONCE(scb_o->itdba) & ~0xffUL; 580 if (gpa && (scb_s->ecb & ECB_TE)) { 581 if (!(gpa & ~0x1fffUL)) { 582 rc = set_validity_icpt(scb_s, 0x0080U); 583 goto unpin; 584 } 585 /* 256 bytes cannot cross page boundaries */ 586 rc = pin_guest_page(vcpu->kvm, gpa, &hpa); 587 if (rc) { 588 rc = set_validity_icpt(scb_s, 0x0080U); 589 goto unpin; 590 } 591 vsie_page->itdba_gpa = gpa; 592 scb_s->itdba = hpa; 593 } 594 595 gpa = READ_ONCE(scb_o->gvrd) & ~0x1ffUL; 596 if (gpa && (scb_s->eca & ECA_VX) && !(scb_s->ecd & ECD_HOSTREGMGMT)) { 597 if (!(gpa & ~0x1fffUL)) { 598 rc = set_validity_icpt(scb_s, 0x1310U); 599 goto unpin; 600 } 601 /* 602 * 512 bytes vector registers cannot cross page boundaries 603 * if this block gets bigger, we have to shadow it. 604 */ 605 rc = pin_guest_page(vcpu->kvm, gpa, &hpa); 606 if (rc) { 607 rc = set_validity_icpt(scb_s, 0x1310U); 608 goto unpin; 609 } 610 vsie_page->gvrd_gpa = gpa; 611 scb_s->gvrd = hpa; 612 } 613 614 gpa = READ_ONCE(scb_o->riccbd) & ~0x3fUL; 615 if (gpa && (scb_s->ecb3 & ECB3_RI)) { 616 if (!(gpa & ~0x1fffUL)) { 617 rc = set_validity_icpt(scb_s, 0x0043U); 618 goto unpin; 619 } 620 /* 64 bytes cannot cross page boundaries */ 621 rc = pin_guest_page(vcpu->kvm, gpa, &hpa); 622 if (rc) { 623 rc = set_validity_icpt(scb_s, 0x0043U); 624 goto unpin; 625 } 626 /* Validity 0x0044 will be checked by SIE */ 627 vsie_page->riccbd_gpa = gpa; 628 scb_s->riccbd = hpa; 629 } 630 if ((scb_s->ecb & ECB_GS) && !(scb_s->ecd & ECD_HOSTREGMGMT)) { 631 unsigned long sdnxc; 632 633 gpa = READ_ONCE(scb_o->sdnxo) & ~0xfUL; 634 sdnxc = READ_ONCE(scb_o->sdnxo) & 0xfUL; 635 if (!gpa || !(gpa & ~0x1fffUL)) { 636 rc = set_validity_icpt(scb_s, 0x10b0U); 637 goto unpin; 638 } 639 if (sdnxc < 6 || sdnxc > 12) { 640 rc = set_validity_icpt(scb_s, 0x10b1U); 641 goto unpin; 642 } 643 if (gpa & ((1 << sdnxc) - 1)) { 644 rc = set_validity_icpt(scb_s, 0x10b2U); 645 goto unpin; 646 } 647 /* Due to alignment rules (checked above) this cannot 648 * cross page boundaries 649 */ 650 rc = pin_guest_page(vcpu->kvm, gpa, &hpa); 651 if (rc) { 652 rc = set_validity_icpt(scb_s, 0x10b0U); 653 goto unpin; 654 } 655 vsie_page->sdnx_gpa = gpa; 656 scb_s->sdnxo = hpa | sdnxc; 657 } 658 return 0; 659 unpin: 660 unpin_blocks(vcpu, vsie_page); 661 return rc; 662 } 663 664 /* unpin the scb provided by guest 2, marking it as dirty */ 665 static void unpin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, 666 gpa_t gpa) 667 { 668 hpa_t hpa = (hpa_t) vsie_page->scb_o; 669 670 if (hpa) 671 unpin_guest_page(vcpu->kvm, gpa, hpa); 672 vsie_page->scb_o = NULL; 673 } 674 675 /* 676 * Pin the scb at gpa provided by guest 2 at vsie_page->scb_o. 677 * 678 * Returns: - 0 if the scb was pinned. 679 * - > 0 if control has to be given to guest 2 680 */ 681 static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, 682 gpa_t gpa) 683 { 684 hpa_t hpa; 685 int rc; 686 687 rc = pin_guest_page(vcpu->kvm, gpa, &hpa); 688 if (rc) { 689 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 690 WARN_ON_ONCE(rc); 691 return 1; 692 } 693 vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa; 694 return 0; 695 } 696 697 /* 698 * Inject a fault into guest 2. 699 * 700 * Returns: - > 0 if control has to be given to guest 2 701 * < 0 if an error occurred during injection. 702 */ 703 static int inject_fault(struct kvm_vcpu *vcpu, __u16 code, __u64 vaddr, 704 bool write_flag) 705 { 706 struct kvm_s390_pgm_info pgm = { 707 .code = code, 708 .trans_exc_code = 709 /* 0-51: virtual address */ 710 (vaddr & 0xfffffffffffff000UL) | 711 /* 52-53: store / fetch */ 712 (((unsigned int) !write_flag) + 1) << 10, 713 /* 62-63: asce id (alway primary == 0) */ 714 .exc_access_id = 0, /* always primary */ 715 .op_access_id = 0, /* not MVPG */ 716 }; 717 int rc; 718 719 if (code == PGM_PROTECTION) 720 pgm.trans_exc_code |= 0x4UL; 721 722 rc = kvm_s390_inject_prog_irq(vcpu, &pgm); 723 return rc ? rc : 1; 724 } 725 726 /* 727 * Handle a fault during vsie execution on a gmap shadow. 728 * 729 * Returns: - 0 if the fault was resolved 730 * - > 0 if control has to be given to guest 2 731 * - < 0 if an error occurred 732 */ 733 static int handle_fault(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 734 { 735 int rc; 736 737 if (current->thread.gmap_int_code == PGM_PROTECTION) 738 /* we can directly forward all protection exceptions */ 739 return inject_fault(vcpu, PGM_PROTECTION, 740 current->thread.gmap_addr, 1); 741 742 rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, 743 current->thread.gmap_addr); 744 if (rc > 0) { 745 rc = inject_fault(vcpu, rc, 746 current->thread.gmap_addr, 747 current->thread.gmap_write_flag); 748 if (rc >= 0) 749 vsie_page->fault_addr = current->thread.gmap_addr; 750 } 751 return rc; 752 } 753 754 /* 755 * Retry the previous fault that required guest 2 intervention. This avoids 756 * one superfluous SIE re-entry and direct exit. 757 * 758 * Will ignore any errors. The next SIE fault will do proper fault handling. 759 */ 760 static void handle_last_fault(struct kvm_vcpu *vcpu, 761 struct vsie_page *vsie_page) 762 { 763 if (vsie_page->fault_addr) 764 kvm_s390_shadow_fault(vcpu, vsie_page->gmap, 765 vsie_page->fault_addr); 766 vsie_page->fault_addr = 0; 767 } 768 769 static inline void clear_vsie_icpt(struct vsie_page *vsie_page) 770 { 771 vsie_page->scb_s.icptcode = 0; 772 } 773 774 /* rewind the psw and clear the vsie icpt, so we can retry execution */ 775 static void retry_vsie_icpt(struct vsie_page *vsie_page) 776 { 777 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 778 int ilen = insn_length(scb_s->ipa >> 8); 779 780 /* take care of EXECUTE instructions */ 781 if (scb_s->icptstatus & 1) { 782 ilen = (scb_s->icptstatus >> 4) & 0x6; 783 if (!ilen) 784 ilen = 4; 785 } 786 scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, ilen); 787 clear_vsie_icpt(vsie_page); 788 } 789 790 /* 791 * Try to shadow + enable the guest 2 provided facility list. 792 * Retry instruction execution if enabled for and provided by guest 2. 793 * 794 * Returns: - 0 if handled (retry or guest 2 icpt) 795 * - > 0 if control has to be given to guest 2 796 */ 797 static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 798 { 799 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 800 __u32 fac = READ_ONCE(vsie_page->scb_o->fac) & 0x7ffffff8U; 801 802 if (fac && test_kvm_facility(vcpu->kvm, 7)) { 803 retry_vsie_icpt(vsie_page); 804 if (read_guest_real(vcpu, fac, &vsie_page->fac, 805 sizeof(vsie_page->fac))) 806 return set_validity_icpt(scb_s, 0x1090U); 807 scb_s->fac = (__u32)(__u64) &vsie_page->fac; 808 } 809 return 0; 810 } 811 812 /* 813 * Run the vsie on a shadow scb and a shadow gmap, without any further 814 * sanity checks, handling SIE faults. 815 * 816 * Returns: - 0 everything went fine 817 * - > 0 if control has to be given to guest 2 818 * - < 0 if an error occurred 819 */ 820 static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 821 { 822 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 823 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; 824 int guest_bp_isolation; 825 int rc; 826 827 handle_last_fault(vcpu, vsie_page); 828 829 if (need_resched()) 830 schedule(); 831 if (test_cpu_flag(CIF_MCCK_PENDING)) 832 s390_handle_mcck(); 833 834 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 835 836 /* save current guest state of bp isolation override */ 837 guest_bp_isolation = test_thread_flag(TIF_ISOLATE_BP_GUEST); 838 839 /* 840 * The guest is running with BPBC, so we have to force it on for our 841 * nested guest. This is done by enabling BPBC globally, so the BPBC 842 * control in the SCB (which the nested guest can modify) is simply 843 * ignored. 844 */ 845 if (test_kvm_facility(vcpu->kvm, 82) && 846 vcpu->arch.sie_block->fpf & FPF_BPBC) 847 set_thread_flag(TIF_ISOLATE_BP_GUEST); 848 849 local_irq_disable(); 850 guest_enter_irqoff(); 851 local_irq_enable(); 852 853 rc = sie64a(scb_s, vcpu->run->s.regs.gprs); 854 855 local_irq_disable(); 856 guest_exit_irqoff(); 857 local_irq_enable(); 858 859 /* restore guest state for bp isolation override */ 860 if (!guest_bp_isolation) 861 clear_thread_flag(TIF_ISOLATE_BP_GUEST); 862 863 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 864 865 if (rc == -EINTR) { 866 VCPU_EVENT(vcpu, 3, "%s", "machine check"); 867 kvm_s390_reinject_machine_check(vcpu, &vsie_page->mcck_info); 868 return 0; 869 } 870 871 if (rc > 0) 872 rc = 0; /* we could still have an icpt */ 873 else if (rc == -EFAULT) 874 return handle_fault(vcpu, vsie_page); 875 876 switch (scb_s->icptcode) { 877 case ICPT_INST: 878 if (scb_s->ipa == 0xb2b0) 879 rc = handle_stfle(vcpu, vsie_page); 880 break; 881 case ICPT_STOP: 882 /* stop not requested by g2 - must have been a kick */ 883 if (!(atomic_read(&scb_o->cpuflags) & CPUSTAT_STOP_INT)) 884 clear_vsie_icpt(vsie_page); 885 break; 886 case ICPT_VALIDITY: 887 if ((scb_s->ipa & 0xf000) != 0xf000) 888 scb_s->ipa += 0x1000; 889 break; 890 } 891 return rc; 892 } 893 894 static void release_gmap_shadow(struct vsie_page *vsie_page) 895 { 896 if (vsie_page->gmap) 897 gmap_put(vsie_page->gmap); 898 WRITE_ONCE(vsie_page->gmap, NULL); 899 prefix_unmapped(vsie_page); 900 } 901 902 static int acquire_gmap_shadow(struct kvm_vcpu *vcpu, 903 struct vsie_page *vsie_page) 904 { 905 unsigned long asce; 906 union ctlreg0 cr0; 907 struct gmap *gmap; 908 int edat; 909 910 asce = vcpu->arch.sie_block->gcr[1]; 911 cr0.val = vcpu->arch.sie_block->gcr[0]; 912 edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8); 913 edat += edat && test_kvm_facility(vcpu->kvm, 78); 914 915 /* 916 * ASCE or EDAT could have changed since last icpt, or the gmap 917 * we're holding has been unshadowed. If the gmap is still valid, 918 * we can safely reuse it. 919 */ 920 if (vsie_page->gmap && gmap_shadow_valid(vsie_page->gmap, asce, edat)) 921 return 0; 922 923 /* release the old shadow - if any, and mark the prefix as unmapped */ 924 release_gmap_shadow(vsie_page); 925 gmap = gmap_shadow(vcpu->arch.gmap, asce, edat); 926 if (IS_ERR(gmap)) 927 return PTR_ERR(gmap); 928 gmap->private = vcpu->kvm; 929 WRITE_ONCE(vsie_page->gmap, gmap); 930 return 0; 931 } 932 933 /* 934 * Register the shadow scb at the VCPU, e.g. for kicking out of vsie. 935 */ 936 static void register_shadow_scb(struct kvm_vcpu *vcpu, 937 struct vsie_page *vsie_page) 938 { 939 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 940 941 WRITE_ONCE(vcpu->arch.vsie_block, &vsie_page->scb_s); 942 /* 943 * External calls have to lead to a kick of the vcpu and 944 * therefore the vsie -> Simulate Wait state. 945 */ 946 kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT); 947 /* 948 * We have to adjust the g3 epoch by the g2 epoch. The epoch will 949 * automatically be adjusted on tod clock changes via kvm_sync_clock. 950 */ 951 preempt_disable(); 952 scb_s->epoch += vcpu->kvm->arch.epoch; 953 954 if (scb_s->ecd & ECD_MEF) { 955 scb_s->epdx += vcpu->kvm->arch.epdx; 956 if (scb_s->epoch < vcpu->kvm->arch.epoch) 957 scb_s->epdx += 1; 958 } 959 960 preempt_enable(); 961 } 962 963 /* 964 * Unregister a shadow scb from a VCPU. 965 */ 966 static void unregister_shadow_scb(struct kvm_vcpu *vcpu) 967 { 968 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT); 969 WRITE_ONCE(vcpu->arch.vsie_block, NULL); 970 } 971 972 /* 973 * Run the vsie on a shadowed scb, managing the gmap shadow, handling 974 * prefix pages and faults. 975 * 976 * Returns: - 0 if no errors occurred 977 * - > 0 if control has to be given to guest 2 978 * - -ENOMEM if out of memory 979 */ 980 static int vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 981 { 982 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; 983 int rc = 0; 984 985 while (1) { 986 rc = acquire_gmap_shadow(vcpu, vsie_page); 987 if (!rc) 988 rc = map_prefix(vcpu, vsie_page); 989 if (!rc) { 990 gmap_enable(vsie_page->gmap); 991 update_intervention_requests(vsie_page); 992 rc = do_vsie_run(vcpu, vsie_page); 993 gmap_enable(vcpu->arch.gmap); 994 } 995 atomic_andnot(PROG_BLOCK_SIE, &scb_s->prog20); 996 997 if (rc == -EAGAIN) 998 rc = 0; 999 if (rc || scb_s->icptcode || signal_pending(current) || 1000 kvm_s390_vcpu_has_irq(vcpu, 0)) 1001 break; 1002 } 1003 1004 if (rc == -EFAULT) { 1005 /* 1006 * Addressing exceptions are always presentes as intercepts. 1007 * As addressing exceptions are suppressing and our guest 3 PSW 1008 * points at the responsible instruction, we have to 1009 * forward the PSW and set the ilc. If we can't read guest 3 1010 * instruction, we can use an arbitrary ilc. Let's always use 1011 * ilen = 4 for now, so we can avoid reading in guest 3 virtual 1012 * memory. (we could also fake the shadow so the hardware 1013 * handles it). 1014 */ 1015 scb_s->icptcode = ICPT_PROGI; 1016 scb_s->iprcc = PGM_ADDRESSING; 1017 scb_s->pgmilc = 4; 1018 scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, 4); 1019 } 1020 return rc; 1021 } 1022 1023 /* 1024 * Get or create a vsie page for a scb address. 1025 * 1026 * Returns: - address of a vsie page (cached or new one) 1027 * - NULL if the same scb address is already used by another VCPU 1028 * - ERR_PTR(-ENOMEM) if out of memory 1029 */ 1030 static struct vsie_page *get_vsie_page(struct kvm *kvm, unsigned long addr) 1031 { 1032 struct vsie_page *vsie_page; 1033 struct page *page; 1034 int nr_vcpus; 1035 1036 rcu_read_lock(); 1037 page = radix_tree_lookup(&kvm->arch.vsie.addr_to_page, addr >> 9); 1038 rcu_read_unlock(); 1039 if (page) { 1040 if (page_ref_inc_return(page) == 2) 1041 return page_to_virt(page); 1042 page_ref_dec(page); 1043 } 1044 1045 /* 1046 * We want at least #online_vcpus shadows, so every VCPU can execute 1047 * the VSIE in parallel. 1048 */ 1049 nr_vcpus = atomic_read(&kvm->online_vcpus); 1050 1051 mutex_lock(&kvm->arch.vsie.mutex); 1052 if (kvm->arch.vsie.page_count < nr_vcpus) { 1053 page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA); 1054 if (!page) { 1055 mutex_unlock(&kvm->arch.vsie.mutex); 1056 return ERR_PTR(-ENOMEM); 1057 } 1058 page_ref_inc(page); 1059 kvm->arch.vsie.pages[kvm->arch.vsie.page_count] = page; 1060 kvm->arch.vsie.page_count++; 1061 } else { 1062 /* reuse an existing entry that belongs to nobody */ 1063 while (true) { 1064 page = kvm->arch.vsie.pages[kvm->arch.vsie.next]; 1065 if (page_ref_inc_return(page) == 2) 1066 break; 1067 page_ref_dec(page); 1068 kvm->arch.vsie.next++; 1069 kvm->arch.vsie.next %= nr_vcpus; 1070 } 1071 radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9); 1072 } 1073 page->index = addr; 1074 /* double use of the same address */ 1075 if (radix_tree_insert(&kvm->arch.vsie.addr_to_page, addr >> 9, page)) { 1076 page_ref_dec(page); 1077 mutex_unlock(&kvm->arch.vsie.mutex); 1078 return NULL; 1079 } 1080 mutex_unlock(&kvm->arch.vsie.mutex); 1081 1082 vsie_page = page_to_virt(page); 1083 memset(&vsie_page->scb_s, 0, sizeof(struct kvm_s390_sie_block)); 1084 release_gmap_shadow(vsie_page); 1085 vsie_page->fault_addr = 0; 1086 vsie_page->scb_s.ihcpu = 0xffffU; 1087 return vsie_page; 1088 } 1089 1090 /* put a vsie page acquired via get_vsie_page */ 1091 static void put_vsie_page(struct kvm *kvm, struct vsie_page *vsie_page) 1092 { 1093 struct page *page = pfn_to_page(__pa(vsie_page) >> PAGE_SHIFT); 1094 1095 page_ref_dec(page); 1096 } 1097 1098 int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu) 1099 { 1100 struct vsie_page *vsie_page; 1101 unsigned long scb_addr; 1102 int rc; 1103 1104 vcpu->stat.instruction_sie++; 1105 if (!test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIEF2)) 1106 return -EOPNOTSUPP; 1107 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 1108 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 1109 1110 BUILD_BUG_ON(sizeof(struct vsie_page) != PAGE_SIZE); 1111 scb_addr = kvm_s390_get_base_disp_s(vcpu, NULL); 1112 1113 /* 512 byte alignment */ 1114 if (unlikely(scb_addr & 0x1ffUL)) 1115 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 1116 1117 if (signal_pending(current) || kvm_s390_vcpu_has_irq(vcpu, 0)) 1118 return 0; 1119 1120 vsie_page = get_vsie_page(vcpu->kvm, scb_addr); 1121 if (IS_ERR(vsie_page)) 1122 return PTR_ERR(vsie_page); 1123 else if (!vsie_page) 1124 /* double use of sie control block - simply do nothing */ 1125 return 0; 1126 1127 rc = pin_scb(vcpu, vsie_page, scb_addr); 1128 if (rc) 1129 goto out_put; 1130 rc = shadow_scb(vcpu, vsie_page); 1131 if (rc) 1132 goto out_unpin_scb; 1133 rc = pin_blocks(vcpu, vsie_page); 1134 if (rc) 1135 goto out_unshadow; 1136 register_shadow_scb(vcpu, vsie_page); 1137 rc = vsie_run(vcpu, vsie_page); 1138 unregister_shadow_scb(vcpu); 1139 unpin_blocks(vcpu, vsie_page); 1140 out_unshadow: 1141 unshadow_scb(vcpu, vsie_page); 1142 out_unpin_scb: 1143 unpin_scb(vcpu, vsie_page, scb_addr); 1144 out_put: 1145 put_vsie_page(vcpu->kvm, vsie_page); 1146 1147 return rc < 0 ? rc : 0; 1148 } 1149 1150 /* Init the vsie data structures. To be called when a vm is initialized. */ 1151 void kvm_s390_vsie_init(struct kvm *kvm) 1152 { 1153 mutex_init(&kvm->arch.vsie.mutex); 1154 INIT_RADIX_TREE(&kvm->arch.vsie.addr_to_page, GFP_KERNEL); 1155 } 1156 1157 /* Destroy the vsie data structures. To be called when a vm is destroyed. */ 1158 void kvm_s390_vsie_destroy(struct kvm *kvm) 1159 { 1160 struct vsie_page *vsie_page; 1161 struct page *page; 1162 int i; 1163 1164 mutex_lock(&kvm->arch.vsie.mutex); 1165 for (i = 0; i < kvm->arch.vsie.page_count; i++) { 1166 page = kvm->arch.vsie.pages[i]; 1167 kvm->arch.vsie.pages[i] = NULL; 1168 vsie_page = page_to_virt(page); 1169 release_gmap_shadow(vsie_page); 1170 /* free the radix tree entry */ 1171 radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9); 1172 __free_page(page); 1173 } 1174 kvm->arch.vsie.page_count = 0; 1175 mutex_unlock(&kvm->arch.vsie.mutex); 1176 } 1177 1178 void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu) 1179 { 1180 struct kvm_s390_sie_block *scb = READ_ONCE(vcpu->arch.vsie_block); 1181 1182 /* 1183 * Even if the VCPU lets go of the shadow sie block reference, it is 1184 * still valid in the cache. So we can safely kick it. 1185 */ 1186 if (scb) { 1187 atomic_or(PROG_BLOCK_SIE, &scb->prog20); 1188 if (scb->prog0c & PROG_IN_SIE) 1189 atomic_or(CPUSTAT_STOP_INT, &scb->cpuflags); 1190 } 1191 } 1192