1/* 2 * hosting zSeries kernel virtual machines 3 * 4 * Copyright IBM Corp. 2008, 2009 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License (version 2 only) 8 * as published by the Free Software Foundation. 9 * 10 * Author(s): Carsten Otte <cotte@de.ibm.com> 11 * Christian Borntraeger <borntraeger@de.ibm.com> 12 * Heiko Carstens <heiko.carstens@de.ibm.com> 13 * Christian Ehrhardt <ehrhardt@de.ibm.com> 14 * Jason J. Herne <jjherne@us.ibm.com> 15 */ 16 17#include <linux/compiler.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/module.h> 25#include <linux/random.h> 26#include <linux/slab.h> 27#include <linux/timer.h> 28#include <linux/vmalloc.h> 29#include <asm/asm-offsets.h> 30#include <asm/lowcore.h> 31#include <asm/etr.h> 32#include <asm/pgtable.h> 33#include <asm/nmi.h> 34#include <asm/switch_to.h> 35#include <asm/isc.h> 36#include <asm/sclp.h> 37#include "kvm-s390.h" 38#include "gaccess.h" 39 40#define KMSG_COMPONENT "kvm-s390" 41#undef pr_fmt 42#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 43 44#define CREATE_TRACE_POINTS 45#include "trace.h" 46#include "trace-s390.h" 47 48#define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */ 49#define LOCAL_IRQS 32 50#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ 51 (KVM_MAX_VCPUS + LOCAL_IRQS)) 52 53#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU 54 55struct kvm_stats_debugfs_item debugfs_entries[] = { 56 { "userspace_handled", VCPU_STAT(exit_userspace) }, 57 { "exit_null", VCPU_STAT(exit_null) }, 58 { "exit_validity", VCPU_STAT(exit_validity) }, 59 { "exit_stop_request", VCPU_STAT(exit_stop_request) }, 60 { "exit_external_request", VCPU_STAT(exit_external_request) }, 61 { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) }, 62 { "exit_instruction", VCPU_STAT(exit_instruction) }, 63 { "exit_program_interruption", VCPU_STAT(exit_program_interruption) }, 64 { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) }, 65 { "halt_successful_poll", VCPU_STAT(halt_successful_poll) }, 66 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) }, 67 { "halt_wakeup", VCPU_STAT(halt_wakeup) }, 68 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) }, 69 { "instruction_lctl", VCPU_STAT(instruction_lctl) }, 70 { "instruction_stctl", VCPU_STAT(instruction_stctl) }, 71 { "instruction_stctg", VCPU_STAT(instruction_stctg) }, 72 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) }, 73 { "deliver_external_call", VCPU_STAT(deliver_external_call) }, 74 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) }, 75 { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) }, 76 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) }, 77 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) }, 78 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) }, 79 { "deliver_program_interruption", VCPU_STAT(deliver_program_int) }, 80 { "exit_wait_state", VCPU_STAT(exit_wait_state) }, 81 { "instruction_pfmf", VCPU_STAT(instruction_pfmf) }, 82 { "instruction_stidp", VCPU_STAT(instruction_stidp) }, 83 { "instruction_spx", VCPU_STAT(instruction_spx) }, 84 { "instruction_stpx", VCPU_STAT(instruction_stpx) }, 85 { "instruction_stap", VCPU_STAT(instruction_stap) }, 86 { "instruction_storage_key", VCPU_STAT(instruction_storage_key) }, 87 { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) }, 88 { "instruction_stsch", VCPU_STAT(instruction_stsch) }, 89 { "instruction_chsc", VCPU_STAT(instruction_chsc) }, 90 { "instruction_essa", VCPU_STAT(instruction_essa) }, 91 { "instruction_stsi", VCPU_STAT(instruction_stsi) }, 92 { "instruction_stfl", VCPU_STAT(instruction_stfl) }, 93 { "instruction_tprot", VCPU_STAT(instruction_tprot) }, 94 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) }, 95 { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) }, 96 { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) }, 97 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) }, 98 { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) }, 99 { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) }, 100 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) }, 101 { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) }, 102 { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) }, 103 { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) }, 104 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) }, 105 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) }, 106 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) }, 107 { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) }, 108 { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) }, 109 { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) }, 110 { "diagnose_10", VCPU_STAT(diagnose_10) }, 111 { "diagnose_44", VCPU_STAT(diagnose_44) }, 112 { "diagnose_9c", VCPU_STAT(diagnose_9c) }, 113 { "diagnose_258", VCPU_STAT(diagnose_258) }, 114 { "diagnose_308", VCPU_STAT(diagnose_308) }, 115 { "diagnose_500", VCPU_STAT(diagnose_500) }, 116 { NULL } 117}; 118 119/* upper facilities limit for kvm */ 120unsigned long kvm_s390_fac_list_mask[] = { 121 0xffe6fffbfcfdfc40UL, 122 0x005e800000000000UL, 123}; 124 125unsigned long kvm_s390_fac_list_mask_size(void) 126{ 127 BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64); 128 return ARRAY_SIZE(kvm_s390_fac_list_mask); 129} 130 131static struct gmap_notifier gmap_notifier; 132debug_info_t *kvm_s390_dbf; 133 134/* Section: not file related */ 135int kvm_arch_hardware_enable(void) 136{ 137 /* every s390 is virtualization enabled ;-) */ 138 return 0; 139} 140 141static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address); 142 143/* 144 * This callback is executed during stop_machine(). All CPUs are therefore 145 * temporarily stopped. In order not to change guest behavior, we have to 146 * disable preemption whenever we touch the epoch of kvm and the VCPUs, 147 * so a CPU won't be stopped while calculating with the epoch. 148 */ 149static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val, 150 void *v) 151{ 152 struct kvm *kvm; 153 struct kvm_vcpu *vcpu; 154 int i; 155 unsigned long long *delta = v; 156 157 list_for_each_entry(kvm, &vm_list, vm_list) { 158 kvm->arch.epoch -= *delta; 159 kvm_for_each_vcpu(i, vcpu, kvm) { 160 vcpu->arch.sie_block->epoch -= *delta; 161 } 162 } 163 return NOTIFY_OK; 164} 165 166static struct notifier_block kvm_clock_notifier = { 167 .notifier_call = kvm_clock_sync, 168}; 169 170int kvm_arch_hardware_setup(void) 171{ 172 gmap_notifier.notifier_call = kvm_gmap_notifier; 173 gmap_register_ipte_notifier(&gmap_notifier); 174 atomic_notifier_chain_register(&s390_epoch_delta_notifier, 175 &kvm_clock_notifier); 176 return 0; 177} 178 179void kvm_arch_hardware_unsetup(void) 180{ 181 gmap_unregister_ipte_notifier(&gmap_notifier); 182 atomic_notifier_chain_unregister(&s390_epoch_delta_notifier, 183 &kvm_clock_notifier); 184} 185 186int kvm_arch_init(void *opaque) 187{ 188 kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long)); 189 if (!kvm_s390_dbf) 190 return -ENOMEM; 191 192 if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) { 193 debug_unregister(kvm_s390_dbf); 194 return -ENOMEM; 195 } 196 197 /* Register floating interrupt controller interface. */ 198 return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC); 199} 200 201void kvm_arch_exit(void) 202{ 203 debug_unregister(kvm_s390_dbf); 204} 205 206/* Section: device related */ 207long kvm_arch_dev_ioctl(struct file *filp, 208 unsigned int ioctl, unsigned long arg) 209{ 210 if (ioctl == KVM_S390_ENABLE_SIE) 211 return s390_enable_sie(); 212 return -EINVAL; 213} 214 215int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 216{ 217 int r; 218 219 switch (ext) { 220 case KVM_CAP_S390_PSW: 221 case KVM_CAP_S390_GMAP: 222 case KVM_CAP_SYNC_MMU: 223#ifdef CONFIG_KVM_S390_UCONTROL 224 case KVM_CAP_S390_UCONTROL: 225#endif 226 case KVM_CAP_ASYNC_PF: 227 case KVM_CAP_SYNC_REGS: 228 case KVM_CAP_ONE_REG: 229 case KVM_CAP_ENABLE_CAP: 230 case KVM_CAP_S390_CSS_SUPPORT: 231 case KVM_CAP_IOEVENTFD: 232 case KVM_CAP_DEVICE_CTRL: 233 case KVM_CAP_ENABLE_CAP_VM: 234 case KVM_CAP_S390_IRQCHIP: 235 case KVM_CAP_VM_ATTRIBUTES: 236 case KVM_CAP_MP_STATE: 237 case KVM_CAP_S390_INJECT_IRQ: 238 case KVM_CAP_S390_USER_SIGP: 239 case KVM_CAP_S390_USER_STSI: 240 case KVM_CAP_S390_SKEYS: 241 case KVM_CAP_S390_IRQ_STATE: 242 r = 1; 243 break; 244 case KVM_CAP_S390_MEM_OP: 245 r = MEM_OP_MAX_SIZE; 246 break; 247 case KVM_CAP_NR_VCPUS: 248 case KVM_CAP_MAX_VCPUS: 249 r = KVM_MAX_VCPUS; 250 break; 251 case KVM_CAP_NR_MEMSLOTS: 252 r = KVM_USER_MEM_SLOTS; 253 break; 254 case KVM_CAP_S390_COW: 255 r = MACHINE_HAS_ESOP; 256 break; 257 case KVM_CAP_S390_VECTOR_REGISTERS: 258 r = MACHINE_HAS_VX; 259 break; 260 default: 261 r = 0; 262 } 263 return r; 264} 265 266static void kvm_s390_sync_dirty_log(struct kvm *kvm, 267 struct kvm_memory_slot *memslot) 268{ 269 gfn_t cur_gfn, last_gfn; 270 unsigned long address; 271 struct gmap *gmap = kvm->arch.gmap; 272 273 down_read(&gmap->mm->mmap_sem); 274 /* Loop over all guest pages */ 275 last_gfn = memslot->base_gfn + memslot->npages; 276 for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) { 277 address = gfn_to_hva_memslot(memslot, cur_gfn); 278 279 if (gmap_test_and_clear_dirty(address, gmap)) 280 mark_page_dirty(kvm, cur_gfn); 281 } 282 up_read(&gmap->mm->mmap_sem); 283} 284 285/* Section: vm related */ 286/* 287 * Get (and clear) the dirty memory log for a memory slot. 288 */ 289int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, 290 struct kvm_dirty_log *log) 291{ 292 int r; 293 unsigned long n; 294 struct kvm_memslots *slots; 295 struct kvm_memory_slot *memslot; 296 int is_dirty = 0; 297 298 mutex_lock(&kvm->slots_lock); 299 300 r = -EINVAL; 301 if (log->slot >= KVM_USER_MEM_SLOTS) 302 goto out; 303 304 slots = kvm_memslots(kvm); 305 memslot = id_to_memslot(slots, log->slot); 306 r = -ENOENT; 307 if (!memslot->dirty_bitmap) 308 goto out; 309 310 kvm_s390_sync_dirty_log(kvm, memslot); 311 r = kvm_get_dirty_log(kvm, log, &is_dirty); 312 if (r) 313 goto out; 314 315 /* Clear the dirty log */ 316 if (is_dirty) { 317 n = kvm_dirty_bitmap_bytes(memslot); 318 memset(memslot->dirty_bitmap, 0, n); 319 } 320 r = 0; 321out: 322 mutex_unlock(&kvm->slots_lock); 323 return r; 324} 325 326static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) 327{ 328 int r; 329 330 if (cap->flags) 331 return -EINVAL; 332 333 switch (cap->cap) { 334 case KVM_CAP_S390_IRQCHIP: 335 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP"); 336 kvm->arch.use_irqchip = 1; 337 r = 0; 338 break; 339 case KVM_CAP_S390_USER_SIGP: 340 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP"); 341 kvm->arch.user_sigp = 1; 342 r = 0; 343 break; 344 case KVM_CAP_S390_VECTOR_REGISTERS: 345 mutex_lock(&kvm->lock); 346 if (atomic_read(&kvm->online_vcpus)) { 347 r = -EBUSY; 348 } else if (MACHINE_HAS_VX) { 349 set_kvm_facility(kvm->arch.model.fac->mask, 129); 350 set_kvm_facility(kvm->arch.model.fac->list, 129); 351 r = 0; 352 } else 353 r = -EINVAL; 354 mutex_unlock(&kvm->lock); 355 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s", 356 r ? "(not available)" : "(success)"); 357 break; 358 case KVM_CAP_S390_USER_STSI: 359 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI"); 360 kvm->arch.user_stsi = 1; 361 r = 0; 362 break; 363 default: 364 r = -EINVAL; 365 break; 366 } 367 return r; 368} 369 370static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 371{ 372 int ret; 373 374 switch (attr->attr) { 375 case KVM_S390_VM_MEM_LIMIT_SIZE: 376 ret = 0; 377 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes", 378 kvm->arch.gmap->asce_end); 379 if (put_user(kvm->arch.gmap->asce_end, (u64 __user *)attr->addr)) 380 ret = -EFAULT; 381 break; 382 default: 383 ret = -ENXIO; 384 break; 385 } 386 return ret; 387} 388 389static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 390{ 391 int ret; 392 unsigned int idx; 393 switch (attr->attr) { 394 case KVM_S390_VM_MEM_ENABLE_CMMA: 395 /* enable CMMA only for z10 and later (EDAT_1) */ 396 ret = -EINVAL; 397 if (!MACHINE_IS_LPAR || !MACHINE_HAS_EDAT1) 398 break; 399 400 ret = -EBUSY; 401 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support"); 402 mutex_lock(&kvm->lock); 403 if (atomic_read(&kvm->online_vcpus) == 0) { 404 kvm->arch.use_cmma = 1; 405 ret = 0; 406 } 407 mutex_unlock(&kvm->lock); 408 break; 409 case KVM_S390_VM_MEM_CLR_CMMA: 410 ret = -EINVAL; 411 if (!kvm->arch.use_cmma) 412 break; 413 414 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states"); 415 mutex_lock(&kvm->lock); 416 idx = srcu_read_lock(&kvm->srcu); 417 s390_reset_cmma(kvm->arch.gmap->mm); 418 srcu_read_unlock(&kvm->srcu, idx); 419 mutex_unlock(&kvm->lock); 420 ret = 0; 421 break; 422 case KVM_S390_VM_MEM_LIMIT_SIZE: { 423 unsigned long new_limit; 424 425 if (kvm_is_ucontrol(kvm)) 426 return -EINVAL; 427 428 if (get_user(new_limit, (u64 __user *)attr->addr)) 429 return -EFAULT; 430 431 if (new_limit > kvm->arch.gmap->asce_end) 432 return -E2BIG; 433 434 ret = -EBUSY; 435 mutex_lock(&kvm->lock); 436 if (atomic_read(&kvm->online_vcpus) == 0) { 437 /* gmap_alloc will round the limit up */ 438 struct gmap *new = gmap_alloc(current->mm, new_limit); 439 440 if (!new) { 441 ret = -ENOMEM; 442 } else { 443 gmap_free(kvm->arch.gmap); 444 new->private = kvm; 445 kvm->arch.gmap = new; 446 ret = 0; 447 } 448 } 449 mutex_unlock(&kvm->lock); 450 VM_EVENT(kvm, 3, "SET: max guest memory: %lu bytes", new_limit); 451 break; 452 } 453 default: 454 ret = -ENXIO; 455 break; 456 } 457 return ret; 458} 459 460static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); 461 462static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) 463{ 464 struct kvm_vcpu *vcpu; 465 int i; 466 467 if (!test_kvm_facility(kvm, 76)) 468 return -EINVAL; 469 470 mutex_lock(&kvm->lock); 471 switch (attr->attr) { 472 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 473 get_random_bytes( 474 kvm->arch.crypto.crycb->aes_wrapping_key_mask, 475 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 476 kvm->arch.crypto.aes_kw = 1; 477 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); 478 break; 479 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 480 get_random_bytes( 481 kvm->arch.crypto.crycb->dea_wrapping_key_mask, 482 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 483 kvm->arch.crypto.dea_kw = 1; 484 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); 485 break; 486 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 487 kvm->arch.crypto.aes_kw = 0; 488 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, 489 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 490 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); 491 break; 492 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 493 kvm->arch.crypto.dea_kw = 0; 494 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, 495 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 496 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support"); 497 break; 498 default: 499 mutex_unlock(&kvm->lock); 500 return -ENXIO; 501 } 502 503 kvm_for_each_vcpu(i, vcpu, kvm) { 504 kvm_s390_vcpu_crypto_setup(vcpu); 505 exit_sie(vcpu); 506 } 507 mutex_unlock(&kvm->lock); 508 return 0; 509} 510 511static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 512{ 513 u8 gtod_high; 514 515 if (copy_from_user(>od_high, (void __user *)attr->addr, 516 sizeof(gtod_high))) 517 return -EFAULT; 518 519 if (gtod_high != 0) 520 return -EINVAL; 521 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high); 522 523 return 0; 524} 525 526static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 527{ 528 u64 gtod; 529 530 if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) 531 return -EFAULT; 532 533 kvm_s390_set_tod_clock(kvm, gtod); 534 VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod); 535 return 0; 536} 537 538static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) 539{ 540 int ret; 541 542 if (attr->flags) 543 return -EINVAL; 544 545 switch (attr->attr) { 546 case KVM_S390_VM_TOD_HIGH: 547 ret = kvm_s390_set_tod_high(kvm, attr); 548 break; 549 case KVM_S390_VM_TOD_LOW: 550 ret = kvm_s390_set_tod_low(kvm, attr); 551 break; 552 default: 553 ret = -ENXIO; 554 break; 555 } 556 return ret; 557} 558 559static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 560{ 561 u8 gtod_high = 0; 562 563 if (copy_to_user((void __user *)attr->addr, >od_high, 564 sizeof(gtod_high))) 565 return -EFAULT; 566 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high); 567 568 return 0; 569} 570 571static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 572{ 573 u64 gtod; 574 575 gtod = kvm_s390_get_tod_clock_fast(kvm); 576 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 577 return -EFAULT; 578 VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod); 579 580 return 0; 581} 582 583static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) 584{ 585 int ret; 586 587 if (attr->flags) 588 return -EINVAL; 589 590 switch (attr->attr) { 591 case KVM_S390_VM_TOD_HIGH: 592 ret = kvm_s390_get_tod_high(kvm, attr); 593 break; 594 case KVM_S390_VM_TOD_LOW: 595 ret = kvm_s390_get_tod_low(kvm, attr); 596 break; 597 default: 598 ret = -ENXIO; 599 break; 600 } 601 return ret; 602} 603 604static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) 605{ 606 struct kvm_s390_vm_cpu_processor *proc; 607 int ret = 0; 608 609 mutex_lock(&kvm->lock); 610 if (atomic_read(&kvm->online_vcpus)) { 611 ret = -EBUSY; 612 goto out; 613 } 614 proc = kzalloc(sizeof(*proc), GFP_KERNEL); 615 if (!proc) { 616 ret = -ENOMEM; 617 goto out; 618 } 619 if (!copy_from_user(proc, (void __user *)attr->addr, 620 sizeof(*proc))) { 621 memcpy(&kvm->arch.model.cpu_id, &proc->cpuid, 622 sizeof(struct cpuid)); 623 kvm->arch.model.ibc = proc->ibc; 624 memcpy(kvm->arch.model.fac->list, proc->fac_list, 625 S390_ARCH_FAC_LIST_SIZE_BYTE); 626 } else 627 ret = -EFAULT; 628 kfree(proc); 629out: 630 mutex_unlock(&kvm->lock); 631 return ret; 632} 633 634static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 635{ 636 int ret = -ENXIO; 637 638 switch (attr->attr) { 639 case KVM_S390_VM_CPU_PROCESSOR: 640 ret = kvm_s390_set_processor(kvm, attr); 641 break; 642 } 643 return ret; 644} 645 646static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr) 647{ 648 struct kvm_s390_vm_cpu_processor *proc; 649 int ret = 0; 650 651 proc = kzalloc(sizeof(*proc), GFP_KERNEL); 652 if (!proc) { 653 ret = -ENOMEM; 654 goto out; 655 } 656 memcpy(&proc->cpuid, &kvm->arch.model.cpu_id, sizeof(struct cpuid)); 657 proc->ibc = kvm->arch.model.ibc; 658 memcpy(&proc->fac_list, kvm->arch.model.fac->list, S390_ARCH_FAC_LIST_SIZE_BYTE); 659 if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc))) 660 ret = -EFAULT; 661 kfree(proc); 662out: 663 return ret; 664} 665 666static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr) 667{ 668 struct kvm_s390_vm_cpu_machine *mach; 669 int ret = 0; 670 671 mach = kzalloc(sizeof(*mach), GFP_KERNEL); 672 if (!mach) { 673 ret = -ENOMEM; 674 goto out; 675 } 676 get_cpu_id((struct cpuid *) &mach->cpuid); 677 mach->ibc = sclp.ibc; 678 memcpy(&mach->fac_mask, kvm->arch.model.fac->mask, 679 S390_ARCH_FAC_LIST_SIZE_BYTE); 680 memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list, 681 S390_ARCH_FAC_LIST_SIZE_BYTE); 682 if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach))) 683 ret = -EFAULT; 684 kfree(mach); 685out: 686 return ret; 687} 688 689static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 690{ 691 int ret = -ENXIO; 692 693 switch (attr->attr) { 694 case KVM_S390_VM_CPU_PROCESSOR: 695 ret = kvm_s390_get_processor(kvm, attr); 696 break; 697 case KVM_S390_VM_CPU_MACHINE: 698 ret = kvm_s390_get_machine(kvm, attr); 699 break; 700 } 701 return ret; 702} 703 704static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) 705{ 706 int ret; 707 708 switch (attr->group) { 709 case KVM_S390_VM_MEM_CTRL: 710 ret = kvm_s390_set_mem_control(kvm, attr); 711 break; 712 case KVM_S390_VM_TOD: 713 ret = kvm_s390_set_tod(kvm, attr); 714 break; 715 case KVM_S390_VM_CPU_MODEL: 716 ret = kvm_s390_set_cpu_model(kvm, attr); 717 break; 718 case KVM_S390_VM_CRYPTO: 719 ret = kvm_s390_vm_set_crypto(kvm, attr); 720 break; 721 default: 722 ret = -ENXIO; 723 break; 724 } 725 726 return ret; 727} 728 729static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) 730{ 731 int ret; 732 733 switch (attr->group) { 734 case KVM_S390_VM_MEM_CTRL: 735 ret = kvm_s390_get_mem_control(kvm, attr); 736 break; 737 case KVM_S390_VM_TOD: 738 ret = kvm_s390_get_tod(kvm, attr); 739 break; 740 case KVM_S390_VM_CPU_MODEL: 741 ret = kvm_s390_get_cpu_model(kvm, attr); 742 break; 743 default: 744 ret = -ENXIO; 745 break; 746 } 747 748 return ret; 749} 750 751static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) 752{ 753 int ret; 754 755 switch (attr->group) { 756 case KVM_S390_VM_MEM_CTRL: 757 switch (attr->attr) { 758 case KVM_S390_VM_MEM_ENABLE_CMMA: 759 case KVM_S390_VM_MEM_CLR_CMMA: 760 case KVM_S390_VM_MEM_LIMIT_SIZE: 761 ret = 0; 762 break; 763 default: 764 ret = -ENXIO; 765 break; 766 } 767 break; 768 case KVM_S390_VM_TOD: 769 switch (attr->attr) { 770 case KVM_S390_VM_TOD_LOW: 771 case KVM_S390_VM_TOD_HIGH: 772 ret = 0; 773 break; 774 default: 775 ret = -ENXIO; 776 break; 777 } 778 break; 779 case KVM_S390_VM_CPU_MODEL: 780 switch (attr->attr) { 781 case KVM_S390_VM_CPU_PROCESSOR: 782 case KVM_S390_VM_CPU_MACHINE: 783 ret = 0; 784 break; 785 default: 786 ret = -ENXIO; 787 break; 788 } 789 break; 790 case KVM_S390_VM_CRYPTO: 791 switch (attr->attr) { 792 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 793 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 794 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 795 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 796 ret = 0; 797 break; 798 default: 799 ret = -ENXIO; 800 break; 801 } 802 break; 803 default: 804 ret = -ENXIO; 805 break; 806 } 807 808 return ret; 809} 810 811static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 812{ 813 uint8_t *keys; 814 uint64_t hva; 815 unsigned long curkey; 816 int i, r = 0; 817 818 if (args->flags != 0) 819 return -EINVAL; 820 821 /* Is this guest using storage keys? */ 822 if (!mm_use_skey(current->mm)) 823 return KVM_S390_GET_SKEYS_NONE; 824 825 /* Enforce sane limit on memory allocation */ 826 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 827 return -EINVAL; 828 829 keys = kmalloc_array(args->count, sizeof(uint8_t), 830 GFP_KERNEL | __GFP_NOWARN); 831 if (!keys) 832 keys = vmalloc(sizeof(uint8_t) * args->count); 833 if (!keys) 834 return -ENOMEM; 835 836 for (i = 0; i < args->count; i++) { 837 hva = gfn_to_hva(kvm, args->start_gfn + i); 838 if (kvm_is_error_hva(hva)) { 839 r = -EFAULT; 840 goto out; 841 } 842 843 curkey = get_guest_storage_key(current->mm, hva); 844 if (IS_ERR_VALUE(curkey)) { 845 r = curkey; 846 goto out; 847 } 848 keys[i] = curkey; 849 } 850 851 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys, 852 sizeof(uint8_t) * args->count); 853 if (r) 854 r = -EFAULT; 855out: 856 kvfree(keys); 857 return r; 858} 859 860static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 861{ 862 uint8_t *keys; 863 uint64_t hva; 864 int i, r = 0; 865 866 if (args->flags != 0) 867 return -EINVAL; 868 869 /* Enforce sane limit on memory allocation */ 870 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 871 return -EINVAL; 872 873 keys = kmalloc_array(args->count, sizeof(uint8_t), 874 GFP_KERNEL | __GFP_NOWARN); 875 if (!keys) 876 keys = vmalloc(sizeof(uint8_t) * args->count); 877 if (!keys) 878 return -ENOMEM; 879 880 r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr, 881 sizeof(uint8_t) * args->count); 882 if (r) { 883 r = -EFAULT; 884 goto out; 885 } 886 887 /* Enable storage key handling for the guest */ 888 r = s390_enable_skey(); 889 if (r) 890 goto out; 891 892 for (i = 0; i < args->count; i++) { 893 hva = gfn_to_hva(kvm, args->start_gfn + i); 894 if (kvm_is_error_hva(hva)) { 895 r = -EFAULT; 896 goto out; 897 } 898 899 /* Lowest order bit is reserved */ 900 if (keys[i] & 0x01) { 901 r = -EINVAL; 902 goto out; 903 } 904 905 r = set_guest_storage_key(current->mm, hva, 906 (unsigned long)keys[i], 0); 907 if (r) 908 goto out; 909 } 910out: 911 kvfree(keys); 912 return r; 913} 914 915long kvm_arch_vm_ioctl(struct file *filp, 916 unsigned int ioctl, unsigned long arg) 917{ 918 struct kvm *kvm = filp->private_data; 919 void __user *argp = (void __user *)arg; 920 struct kvm_device_attr attr; 921 int r; 922 923 switch (ioctl) { 924 case KVM_S390_INTERRUPT: { 925 struct kvm_s390_interrupt s390int; 926 927 r = -EFAULT; 928 if (copy_from_user(&s390int, argp, sizeof(s390int))) 929 break; 930 r = kvm_s390_inject_vm(kvm, &s390int); 931 break; 932 } 933 case KVM_ENABLE_CAP: { 934 struct kvm_enable_cap cap; 935 r = -EFAULT; 936 if (copy_from_user(&cap, argp, sizeof(cap))) 937 break; 938 r = kvm_vm_ioctl_enable_cap(kvm, &cap); 939 break; 940 } 941 case KVM_CREATE_IRQCHIP: { 942 struct kvm_irq_routing_entry routing; 943 944 r = -EINVAL; 945 if (kvm->arch.use_irqchip) { 946 /* Set up dummy routing. */ 947 memset(&routing, 0, sizeof(routing)); 948 r = kvm_set_irq_routing(kvm, &routing, 0, 0); 949 } 950 break; 951 } 952 case KVM_SET_DEVICE_ATTR: { 953 r = -EFAULT; 954 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 955 break; 956 r = kvm_s390_vm_set_attr(kvm, &attr); 957 break; 958 } 959 case KVM_GET_DEVICE_ATTR: { 960 r = -EFAULT; 961 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 962 break; 963 r = kvm_s390_vm_get_attr(kvm, &attr); 964 break; 965 } 966 case KVM_HAS_DEVICE_ATTR: { 967 r = -EFAULT; 968 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 969 break; 970 r = kvm_s390_vm_has_attr(kvm, &attr); 971 break; 972 } 973 case KVM_S390_GET_SKEYS: { 974 struct kvm_s390_skeys args; 975 976 r = -EFAULT; 977 if (copy_from_user(&args, argp, 978 sizeof(struct kvm_s390_skeys))) 979 break; 980 r = kvm_s390_get_skeys(kvm, &args); 981 break; 982 } 983 case KVM_S390_SET_SKEYS: { 984 struct kvm_s390_skeys args; 985 986 r = -EFAULT; 987 if (copy_from_user(&args, argp, 988 sizeof(struct kvm_s390_skeys))) 989 break; 990 r = kvm_s390_set_skeys(kvm, &args); 991 break; 992 } 993 default: 994 r = -ENOTTY; 995 } 996 997 return r; 998} 999 1000static int kvm_s390_query_ap_config(u8 *config) 1001{ 1002 u32 fcn_code = 0x04000000UL; 1003 u32 cc = 0; 1004 1005 memset(config, 0, 128); 1006 asm volatile( 1007 "lgr 0,%1\n" 1008 "lgr 2,%2\n" 1009 ".long 0xb2af0000\n" /* PQAP(QCI) */ 1010 "0: ipm %0\n" 1011 "srl %0,28\n" 1012 "1:\n" 1013 EX_TABLE(0b, 1b) 1014 : "+r" (cc) 1015 : "r" (fcn_code), "r" (config) 1016 : "cc", "0", "2", "memory" 1017 ); 1018 1019 return cc; 1020} 1021 1022static int kvm_s390_apxa_installed(void) 1023{ 1024 u8 config[128]; 1025 int cc; 1026 1027 if (test_facility(2) && test_facility(12)) { 1028 cc = kvm_s390_query_ap_config(config); 1029 1030 if (cc) 1031 pr_err("PQAP(QCI) failed with cc=%d", cc); 1032 else 1033 return config[0] & 0x40; 1034 } 1035 1036 return 0; 1037} 1038 1039static void kvm_s390_set_crycb_format(struct kvm *kvm) 1040{ 1041 kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb; 1042 1043 if (kvm_s390_apxa_installed()) 1044 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2; 1045 else 1046 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1; 1047} 1048 1049static void kvm_s390_get_cpu_id(struct cpuid *cpu_id) 1050{ 1051 get_cpu_id(cpu_id); 1052 cpu_id->version = 0xff; 1053} 1054 1055static int kvm_s390_crypto_init(struct kvm *kvm) 1056{ 1057 if (!test_kvm_facility(kvm, 76)) 1058 return 0; 1059 1060 kvm->arch.crypto.crycb = kzalloc(sizeof(*kvm->arch.crypto.crycb), 1061 GFP_KERNEL | GFP_DMA); 1062 if (!kvm->arch.crypto.crycb) 1063 return -ENOMEM; 1064 1065 kvm_s390_set_crycb_format(kvm); 1066 1067 /* Enable AES/DEA protected key functions by default */ 1068 kvm->arch.crypto.aes_kw = 1; 1069 kvm->arch.crypto.dea_kw = 1; 1070 get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 1071 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 1072 get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 1073 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 1074 1075 return 0; 1076} 1077 1078int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 1079{ 1080 int i, rc; 1081 char debug_name[16]; 1082 static unsigned long sca_offset; 1083 1084 rc = -EINVAL; 1085#ifdef CONFIG_KVM_S390_UCONTROL 1086 if (type & ~KVM_VM_S390_UCONTROL) 1087 goto out_err; 1088 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) 1089 goto out_err; 1090#else 1091 if (type) 1092 goto out_err; 1093#endif 1094 1095 rc = s390_enable_sie(); 1096 if (rc) 1097 goto out_err; 1098 1099 rc = -ENOMEM; 1100 1101 kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL); 1102 if (!kvm->arch.sca) 1103 goto out_err; 1104 spin_lock(&kvm_lock); 1105 sca_offset += 16; 1106 if (sca_offset + sizeof(struct sca_block) > PAGE_SIZE) 1107 sca_offset = 0; 1108 kvm->arch.sca = (struct sca_block *) ((char *) kvm->arch.sca + sca_offset); 1109 spin_unlock(&kvm_lock); 1110 1111 sprintf(debug_name, "kvm-%u", current->pid); 1112 1113 kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long)); 1114 if (!kvm->arch.dbf) 1115 goto out_err; 1116 1117 /* 1118 * The architectural maximum amount of facilities is 16 kbit. To store 1119 * this amount, 2 kbyte of memory is required. Thus we need a full 1120 * page to hold the guest facility list (arch.model.fac->list) and the 1121 * facility mask (arch.model.fac->mask). Its address size has to be 1122 * 31 bits and word aligned. 1123 */ 1124 kvm->arch.model.fac = 1125 (struct kvm_s390_fac *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1126 if (!kvm->arch.model.fac) 1127 goto out_err; 1128 1129 /* Populate the facility mask initially. */ 1130 memcpy(kvm->arch.model.fac->mask, S390_lowcore.stfle_fac_list, 1131 S390_ARCH_FAC_LIST_SIZE_BYTE); 1132 for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) { 1133 if (i < kvm_s390_fac_list_mask_size()) 1134 kvm->arch.model.fac->mask[i] &= kvm_s390_fac_list_mask[i]; 1135 else 1136 kvm->arch.model.fac->mask[i] = 0UL; 1137 } 1138 1139 /* Populate the facility list initially. */ 1140 memcpy(kvm->arch.model.fac->list, kvm->arch.model.fac->mask, 1141 S390_ARCH_FAC_LIST_SIZE_BYTE); 1142 1143 kvm_s390_get_cpu_id(&kvm->arch.model.cpu_id); 1144 kvm->arch.model.ibc = sclp.ibc & 0x0fff; 1145 1146 if (kvm_s390_crypto_init(kvm) < 0) 1147 goto out_err; 1148 1149 spin_lock_init(&kvm->arch.float_int.lock); 1150 for (i = 0; i < FIRQ_LIST_COUNT; i++) 1151 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]); 1152 init_waitqueue_head(&kvm->arch.ipte_wq); 1153 mutex_init(&kvm->arch.ipte_mutex); 1154 1155 debug_register_view(kvm->arch.dbf, &debug_sprintf_view); 1156 VM_EVENT(kvm, 3, "vm created with type %lu", type); 1157 1158 if (type & KVM_VM_S390_UCONTROL) { 1159 kvm->arch.gmap = NULL; 1160 } else { 1161 kvm->arch.gmap = gmap_alloc(current->mm, (1UL << 44) - 1); 1162 if (!kvm->arch.gmap) 1163 goto out_err; 1164 kvm->arch.gmap->private = kvm; 1165 kvm->arch.gmap->pfault_enabled = 0; 1166 } 1167 1168 kvm->arch.css_support = 0; 1169 kvm->arch.use_irqchip = 0; 1170 kvm->arch.epoch = 0; 1171 1172 spin_lock_init(&kvm->arch.start_stop_lock); 1173 KVM_EVENT(3, "vm 0x%p created by pid %u", kvm, current->pid); 1174 1175 return 0; 1176out_err: 1177 kfree(kvm->arch.crypto.crycb); 1178 free_page((unsigned long)kvm->arch.model.fac); 1179 debug_unregister(kvm->arch.dbf); 1180 free_page((unsigned long)(kvm->arch.sca)); 1181 KVM_EVENT(3, "creation of vm failed: %d", rc); 1182 return rc; 1183} 1184 1185void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 1186{ 1187 VCPU_EVENT(vcpu, 3, "%s", "free cpu"); 1188 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); 1189 kvm_s390_clear_local_irqs(vcpu); 1190 kvm_clear_async_pf_completion_queue(vcpu); 1191 if (!kvm_is_ucontrol(vcpu->kvm)) { 1192 clear_bit(63 - vcpu->vcpu_id, 1193 (unsigned long *) &vcpu->kvm->arch.sca->mcn); 1194 if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda == 1195 (__u64) vcpu->arch.sie_block) 1196 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0; 1197 } 1198 smp_mb(); 1199 1200 if (kvm_is_ucontrol(vcpu->kvm)) 1201 gmap_free(vcpu->arch.gmap); 1202 1203 if (vcpu->kvm->arch.use_cmma) 1204 kvm_s390_vcpu_unsetup_cmma(vcpu); 1205 free_page((unsigned long)(vcpu->arch.sie_block)); 1206 1207 kvm_vcpu_uninit(vcpu); 1208 kmem_cache_free(kvm_vcpu_cache, vcpu); 1209} 1210 1211static void kvm_free_vcpus(struct kvm *kvm) 1212{ 1213 unsigned int i; 1214 struct kvm_vcpu *vcpu; 1215 1216 kvm_for_each_vcpu(i, vcpu, kvm) 1217 kvm_arch_vcpu_destroy(vcpu); 1218 1219 mutex_lock(&kvm->lock); 1220 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) 1221 kvm->vcpus[i] = NULL; 1222 1223 atomic_set(&kvm->online_vcpus, 0); 1224 mutex_unlock(&kvm->lock); 1225} 1226 1227void kvm_arch_destroy_vm(struct kvm *kvm) 1228{ 1229 kvm_free_vcpus(kvm); 1230 free_page((unsigned long)kvm->arch.model.fac); 1231 free_page((unsigned long)(kvm->arch.sca)); 1232 debug_unregister(kvm->arch.dbf); 1233 kfree(kvm->arch.crypto.crycb); 1234 if (!kvm_is_ucontrol(kvm)) 1235 gmap_free(kvm->arch.gmap); 1236 kvm_s390_destroy_adapters(kvm); 1237 kvm_s390_clear_float_irqs(kvm); 1238 KVM_EVENT(3, "vm 0x%p destroyed", kvm); 1239} 1240 1241/* Section: vcpu related */ 1242static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu) 1243{ 1244 vcpu->arch.gmap = gmap_alloc(current->mm, -1UL); 1245 if (!vcpu->arch.gmap) 1246 return -ENOMEM; 1247 vcpu->arch.gmap->private = vcpu->kvm; 1248 1249 return 0; 1250} 1251 1252int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 1253{ 1254 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 1255 kvm_clear_async_pf_completion_queue(vcpu); 1256 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | 1257 KVM_SYNC_GPRS | 1258 KVM_SYNC_ACRS | 1259 KVM_SYNC_CRS | 1260 KVM_SYNC_ARCH0 | 1261 KVM_SYNC_PFAULT; 1262 if (test_kvm_facility(vcpu->kvm, 129)) 1263 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS; 1264 1265 if (kvm_is_ucontrol(vcpu->kvm)) 1266 return __kvm_ucontrol_vcpu_init(vcpu); 1267 1268 return 0; 1269} 1270 1271void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 1272{ 1273 /* Save host register state */ 1274 save_fpu_regs(); 1275 vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc; 1276 vcpu->arch.host_fpregs.regs = current->thread.fpu.regs; 1277 1278 /* Depending on MACHINE_HAS_VX, data stored to vrs either 1279 * has vector register or floating point register format. 1280 */ 1281 current->thread.fpu.regs = vcpu->run->s.regs.vrs; 1282 current->thread.fpu.fpc = vcpu->run->s.regs.fpc; 1283 if (test_fp_ctl(current->thread.fpu.fpc)) 1284 /* User space provided an invalid FPC, let's clear it */ 1285 current->thread.fpu.fpc = 0; 1286 1287 save_access_regs(vcpu->arch.host_acrs); 1288 restore_access_regs(vcpu->run->s.regs.acrs); 1289 gmap_enable(vcpu->arch.gmap); 1290 atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); 1291} 1292 1293void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 1294{ 1295 atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); 1296 gmap_disable(vcpu->arch.gmap); 1297 1298 /* Save guest register state */ 1299 save_fpu_regs(); 1300 vcpu->run->s.regs.fpc = current->thread.fpu.fpc; 1301 1302 /* Restore host register state */ 1303 current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc; 1304 current->thread.fpu.regs = vcpu->arch.host_fpregs.regs; 1305 1306 save_access_regs(vcpu->run->s.regs.acrs); 1307 restore_access_regs(vcpu->arch.host_acrs); 1308} 1309 1310static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) 1311{ 1312 /* this equals initial cpu reset in pop, but we don't switch to ESA */ 1313 vcpu->arch.sie_block->gpsw.mask = 0UL; 1314 vcpu->arch.sie_block->gpsw.addr = 0UL; 1315 kvm_s390_set_prefix(vcpu, 0); 1316 vcpu->arch.sie_block->cputm = 0UL; 1317 vcpu->arch.sie_block->ckc = 0UL; 1318 vcpu->arch.sie_block->todpr = 0; 1319 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64)); 1320 vcpu->arch.sie_block->gcr[0] = 0xE0UL; 1321 vcpu->arch.sie_block->gcr[14] = 0xC2000000UL; 1322 /* make sure the new fpc will be lazily loaded */ 1323 save_fpu_regs(); 1324 current->thread.fpu.fpc = 0; 1325 vcpu->arch.sie_block->gbea = 1; 1326 vcpu->arch.sie_block->pp = 0; 1327 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 1328 kvm_clear_async_pf_completion_queue(vcpu); 1329 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) 1330 kvm_s390_vcpu_stop(vcpu); 1331 kvm_s390_clear_local_irqs(vcpu); 1332} 1333 1334void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 1335{ 1336 mutex_lock(&vcpu->kvm->lock); 1337 preempt_disable(); 1338 vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; 1339 preempt_enable(); 1340 mutex_unlock(&vcpu->kvm->lock); 1341 if (!kvm_is_ucontrol(vcpu->kvm)) 1342 vcpu->arch.gmap = vcpu->kvm->arch.gmap; 1343} 1344 1345static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) 1346{ 1347 if (!test_kvm_facility(vcpu->kvm, 76)) 1348 return; 1349 1350 vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); 1351 1352 if (vcpu->kvm->arch.crypto.aes_kw) 1353 vcpu->arch.sie_block->ecb3 |= ECB3_AES; 1354 if (vcpu->kvm->arch.crypto.dea_kw) 1355 vcpu->arch.sie_block->ecb3 |= ECB3_DEA; 1356 1357 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; 1358} 1359 1360void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) 1361{ 1362 free_page(vcpu->arch.sie_block->cbrlo); 1363 vcpu->arch.sie_block->cbrlo = 0; 1364} 1365 1366int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) 1367{ 1368 vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL); 1369 if (!vcpu->arch.sie_block->cbrlo) 1370 return -ENOMEM; 1371 1372 vcpu->arch.sie_block->ecb2 |= 0x80; 1373 vcpu->arch.sie_block->ecb2 &= ~0x08; 1374 return 0; 1375} 1376 1377static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu) 1378{ 1379 struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model; 1380 1381 vcpu->arch.cpu_id = model->cpu_id; 1382 vcpu->arch.sie_block->ibc = model->ibc; 1383 vcpu->arch.sie_block->fac = (int) (long) model->fac->list; 1384} 1385 1386int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 1387{ 1388 int rc = 0; 1389 1390 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | 1391 CPUSTAT_SM | 1392 CPUSTAT_STOPPED); 1393 1394 if (test_kvm_facility(vcpu->kvm, 78)) 1395 atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags); 1396 else if (test_kvm_facility(vcpu->kvm, 8)) 1397 atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags); 1398 1399 kvm_s390_vcpu_setup_model(vcpu); 1400 1401 vcpu->arch.sie_block->ecb = 6; 1402 if (test_kvm_facility(vcpu->kvm, 50) && test_kvm_facility(vcpu->kvm, 73)) 1403 vcpu->arch.sie_block->ecb |= 0x10; 1404 1405 vcpu->arch.sie_block->ecb2 = 8; 1406 vcpu->arch.sie_block->eca = 0xC1002000U; 1407 if (sclp.has_siif) 1408 vcpu->arch.sie_block->eca |= 1; 1409 if (sclp.has_sigpif) 1410 vcpu->arch.sie_block->eca |= 0x10000000U; 1411 if (test_kvm_facility(vcpu->kvm, 129)) { 1412 vcpu->arch.sie_block->eca |= 0x00020000; 1413 vcpu->arch.sie_block->ecd |= 0x20000000; 1414 } 1415 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 1416 1417 if (vcpu->kvm->arch.use_cmma) { 1418 rc = kvm_s390_vcpu_setup_cmma(vcpu); 1419 if (rc) 1420 return rc; 1421 } 1422 hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 1423 vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup; 1424 1425 kvm_s390_vcpu_crypto_setup(vcpu); 1426 1427 return rc; 1428} 1429 1430struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, 1431 unsigned int id) 1432{ 1433 struct kvm_vcpu *vcpu; 1434 struct sie_page *sie_page; 1435 int rc = -EINVAL; 1436 1437 if (id >= KVM_MAX_VCPUS) 1438 goto out; 1439 1440 rc = -ENOMEM; 1441 1442 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); 1443 if (!vcpu) 1444 goto out; 1445 1446 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL); 1447 if (!sie_page) 1448 goto out_free_cpu; 1449 1450 vcpu->arch.sie_block = &sie_page->sie_block; 1451 vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb; 1452 1453 vcpu->arch.sie_block->icpua = id; 1454 if (!kvm_is_ucontrol(kvm)) { 1455 if (!kvm->arch.sca) { 1456 WARN_ON_ONCE(1); 1457 goto out_free_cpu; 1458 } 1459 if (!kvm->arch.sca->cpu[id].sda) 1460 kvm->arch.sca->cpu[id].sda = 1461 (__u64) vcpu->arch.sie_block; 1462 vcpu->arch.sie_block->scaoh = 1463 (__u32)(((__u64)kvm->arch.sca) >> 32); 1464 vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca; 1465 set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn); 1466 } 1467 1468 spin_lock_init(&vcpu->arch.local_int.lock); 1469 vcpu->arch.local_int.float_int = &kvm->arch.float_int; 1470 vcpu->arch.local_int.wq = &vcpu->wq; 1471 vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags; 1472 1473 rc = kvm_vcpu_init(vcpu, kvm, id); 1474 if (rc) 1475 goto out_free_sie_block; 1476 VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu, 1477 vcpu->arch.sie_block); 1478 trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block); 1479 1480 return vcpu; 1481out_free_sie_block: 1482 free_page((unsigned long)(vcpu->arch.sie_block)); 1483out_free_cpu: 1484 kmem_cache_free(kvm_vcpu_cache, vcpu); 1485out: 1486 return ERR_PTR(rc); 1487} 1488 1489int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 1490{ 1491 return kvm_s390_vcpu_has_irq(vcpu, 0); 1492} 1493 1494void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu) 1495{ 1496 atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 1497 exit_sie(vcpu); 1498} 1499 1500void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu) 1501{ 1502 atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 1503} 1504 1505static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu) 1506{ 1507 atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 1508 exit_sie(vcpu); 1509} 1510 1511static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu) 1512{ 1513 atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 1514} 1515 1516/* 1517 * Kick a guest cpu out of SIE and wait until SIE is not running. 1518 * If the CPU is not running (e.g. waiting as idle) the function will 1519 * return immediately. */ 1520void exit_sie(struct kvm_vcpu *vcpu) 1521{ 1522 atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags); 1523 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) 1524 cpu_relax(); 1525} 1526 1527/* Kick a guest cpu out of SIE to process a request synchronously */ 1528void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu) 1529{ 1530 kvm_make_request(req, vcpu); 1531 kvm_s390_vcpu_request(vcpu); 1532} 1533 1534static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address) 1535{ 1536 int i; 1537 struct kvm *kvm = gmap->private; 1538 struct kvm_vcpu *vcpu; 1539 1540 kvm_for_each_vcpu(i, vcpu, kvm) { 1541 /* match against both prefix pages */ 1542 if (kvm_s390_get_prefix(vcpu) == (address & ~0x1000UL)) { 1543 VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address); 1544 kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu); 1545 } 1546 } 1547} 1548 1549int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 1550{ 1551 /* kvm common code refers to this, but never calls it */ 1552 BUG(); 1553 return 0; 1554} 1555 1556static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, 1557 struct kvm_one_reg *reg) 1558{ 1559 int r = -EINVAL; 1560 1561 switch (reg->id) { 1562 case KVM_REG_S390_TODPR: 1563 r = put_user(vcpu->arch.sie_block->todpr, 1564 (u32 __user *)reg->addr); 1565 break; 1566 case KVM_REG_S390_EPOCHDIFF: 1567 r = put_user(vcpu->arch.sie_block->epoch, 1568 (u64 __user *)reg->addr); 1569 break; 1570 case KVM_REG_S390_CPU_TIMER: 1571 r = put_user(vcpu->arch.sie_block->cputm, 1572 (u64 __user *)reg->addr); 1573 break; 1574 case KVM_REG_S390_CLOCK_COMP: 1575 r = put_user(vcpu->arch.sie_block->ckc, 1576 (u64 __user *)reg->addr); 1577 break; 1578 case KVM_REG_S390_PFTOKEN: 1579 r = put_user(vcpu->arch.pfault_token, 1580 (u64 __user *)reg->addr); 1581 break; 1582 case KVM_REG_S390_PFCOMPARE: 1583 r = put_user(vcpu->arch.pfault_compare, 1584 (u64 __user *)reg->addr); 1585 break; 1586 case KVM_REG_S390_PFSELECT: 1587 r = put_user(vcpu->arch.pfault_select, 1588 (u64 __user *)reg->addr); 1589 break; 1590 case KVM_REG_S390_PP: 1591 r = put_user(vcpu->arch.sie_block->pp, 1592 (u64 __user *)reg->addr); 1593 break; 1594 case KVM_REG_S390_GBEA: 1595 r = put_user(vcpu->arch.sie_block->gbea, 1596 (u64 __user *)reg->addr); 1597 break; 1598 default: 1599 break; 1600 } 1601 1602 return r; 1603} 1604 1605static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, 1606 struct kvm_one_reg *reg) 1607{ 1608 int r = -EINVAL; 1609 1610 switch (reg->id) { 1611 case KVM_REG_S390_TODPR: 1612 r = get_user(vcpu->arch.sie_block->todpr, 1613 (u32 __user *)reg->addr); 1614 break; 1615 case KVM_REG_S390_EPOCHDIFF: 1616 r = get_user(vcpu->arch.sie_block->epoch, 1617 (u64 __user *)reg->addr); 1618 break; 1619 case KVM_REG_S390_CPU_TIMER: 1620 r = get_user(vcpu->arch.sie_block->cputm, 1621 (u64 __user *)reg->addr); 1622 break; 1623 case KVM_REG_S390_CLOCK_COMP: 1624 r = get_user(vcpu->arch.sie_block->ckc, 1625 (u64 __user *)reg->addr); 1626 break; 1627 case KVM_REG_S390_PFTOKEN: 1628 r = get_user(vcpu->arch.pfault_token, 1629 (u64 __user *)reg->addr); 1630 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 1631 kvm_clear_async_pf_completion_queue(vcpu); 1632 break; 1633 case KVM_REG_S390_PFCOMPARE: 1634 r = get_user(vcpu->arch.pfault_compare, 1635 (u64 __user *)reg->addr); 1636 break; 1637 case KVM_REG_S390_PFSELECT: 1638 r = get_user(vcpu->arch.pfault_select, 1639 (u64 __user *)reg->addr); 1640 break; 1641 case KVM_REG_S390_PP: 1642 r = get_user(vcpu->arch.sie_block->pp, 1643 (u64 __user *)reg->addr); 1644 break; 1645 case KVM_REG_S390_GBEA: 1646 r = get_user(vcpu->arch.sie_block->gbea, 1647 (u64 __user *)reg->addr); 1648 break; 1649 default: 1650 break; 1651 } 1652 1653 return r; 1654} 1655 1656static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) 1657{ 1658 kvm_s390_vcpu_initial_reset(vcpu); 1659 return 0; 1660} 1661 1662int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 1663{ 1664 memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); 1665 return 0; 1666} 1667 1668int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 1669{ 1670 memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); 1671 return 0; 1672} 1673 1674int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 1675 struct kvm_sregs *sregs) 1676{ 1677 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); 1678 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); 1679 restore_access_regs(vcpu->run->s.regs.acrs); 1680 return 0; 1681} 1682 1683int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 1684 struct kvm_sregs *sregs) 1685{ 1686 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); 1687 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); 1688 return 0; 1689} 1690 1691int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 1692{ 1693 /* make sure the new values will be lazily loaded */ 1694 save_fpu_regs(); 1695 if (test_fp_ctl(fpu->fpc)) 1696 return -EINVAL; 1697 current->thread.fpu.fpc = fpu->fpc; 1698 if (MACHINE_HAS_VX) 1699 convert_fp_to_vx(current->thread.fpu.vxrs, (freg_t *)fpu->fprs); 1700 else 1701 memcpy(current->thread.fpu.fprs, &fpu->fprs, sizeof(fpu->fprs)); 1702 return 0; 1703} 1704 1705int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 1706{ 1707 /* make sure we have the latest values */ 1708 save_fpu_regs(); 1709 if (MACHINE_HAS_VX) 1710 convert_vx_to_fp((freg_t *)fpu->fprs, current->thread.fpu.vxrs); 1711 else 1712 memcpy(fpu->fprs, current->thread.fpu.fprs, sizeof(fpu->fprs)); 1713 fpu->fpc = current->thread.fpu.fpc; 1714 return 0; 1715} 1716 1717static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) 1718{ 1719 int rc = 0; 1720 1721 if (!is_vcpu_stopped(vcpu)) 1722 rc = -EBUSY; 1723 else { 1724 vcpu->run->psw_mask = psw.mask; 1725 vcpu->run->psw_addr = psw.addr; 1726 } 1727 return rc; 1728} 1729 1730int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 1731 struct kvm_translation *tr) 1732{ 1733 return -EINVAL; /* not implemented yet */ 1734} 1735 1736#define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ 1737 KVM_GUESTDBG_USE_HW_BP | \ 1738 KVM_GUESTDBG_ENABLE) 1739 1740int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 1741 struct kvm_guest_debug *dbg) 1742{ 1743 int rc = 0; 1744 1745 vcpu->guest_debug = 0; 1746 kvm_s390_clear_bp_data(vcpu); 1747 1748 if (dbg->control & ~VALID_GUESTDBG_FLAGS) 1749 return -EINVAL; 1750 1751 if (dbg->control & KVM_GUESTDBG_ENABLE) { 1752 vcpu->guest_debug = dbg->control; 1753 /* enforce guest PER */ 1754 atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); 1755 1756 if (dbg->control & KVM_GUESTDBG_USE_HW_BP) 1757 rc = kvm_s390_import_bp_data(vcpu, dbg); 1758 } else { 1759 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); 1760 vcpu->arch.guestdbg.last_bp = 0; 1761 } 1762 1763 if (rc) { 1764 vcpu->guest_debug = 0; 1765 kvm_s390_clear_bp_data(vcpu); 1766 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); 1767 } 1768 1769 return rc; 1770} 1771 1772int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 1773 struct kvm_mp_state *mp_state) 1774{ 1775 /* CHECK_STOP and LOAD are not supported yet */ 1776 return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED : 1777 KVM_MP_STATE_OPERATING; 1778} 1779 1780int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 1781 struct kvm_mp_state *mp_state) 1782{ 1783 int rc = 0; 1784 1785 /* user space knows about this interface - let it control the state */ 1786 vcpu->kvm->arch.user_cpu_state_ctrl = 1; 1787 1788 switch (mp_state->mp_state) { 1789 case KVM_MP_STATE_STOPPED: 1790 kvm_s390_vcpu_stop(vcpu); 1791 break; 1792 case KVM_MP_STATE_OPERATING: 1793 kvm_s390_vcpu_start(vcpu); 1794 break; 1795 case KVM_MP_STATE_LOAD: 1796 case KVM_MP_STATE_CHECK_STOP: 1797 /* fall through - CHECK_STOP and LOAD are not supported yet */ 1798 default: 1799 rc = -ENXIO; 1800 } 1801 1802 return rc; 1803} 1804 1805static bool ibs_enabled(struct kvm_vcpu *vcpu) 1806{ 1807 return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS; 1808} 1809 1810static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) 1811{ 1812retry: 1813 kvm_s390_vcpu_request_handled(vcpu); 1814 if (!vcpu->requests) 1815 return 0; 1816 /* 1817 * We use MMU_RELOAD just to re-arm the ipte notifier for the 1818 * guest prefix page. gmap_ipte_notify will wait on the ptl lock. 1819 * This ensures that the ipte instruction for this request has 1820 * already finished. We might race against a second unmapper that 1821 * wants to set the blocking bit. Lets just retry the request loop. 1822 */ 1823 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) { 1824 int rc; 1825 rc = gmap_ipte_notify(vcpu->arch.gmap, 1826 kvm_s390_get_prefix(vcpu), 1827 PAGE_SIZE * 2); 1828 if (rc) 1829 return rc; 1830 goto retry; 1831 } 1832 1833 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { 1834 vcpu->arch.sie_block->ihcpu = 0xffff; 1835 goto retry; 1836 } 1837 1838 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { 1839 if (!ibs_enabled(vcpu)) { 1840 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); 1841 atomic_or(CPUSTAT_IBS, 1842 &vcpu->arch.sie_block->cpuflags); 1843 } 1844 goto retry; 1845 } 1846 1847 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { 1848 if (ibs_enabled(vcpu)) { 1849 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); 1850 atomic_andnot(CPUSTAT_IBS, 1851 &vcpu->arch.sie_block->cpuflags); 1852 } 1853 goto retry; 1854 } 1855 1856 /* nothing to do, just clear the request */ 1857 clear_bit(KVM_REQ_UNHALT, &vcpu->requests); 1858 1859 return 0; 1860} 1861 1862void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod) 1863{ 1864 struct kvm_vcpu *vcpu; 1865 int i; 1866 1867 mutex_lock(&kvm->lock); 1868 preempt_disable(); 1869 kvm->arch.epoch = tod - get_tod_clock(); 1870 kvm_s390_vcpu_block_all(kvm); 1871 kvm_for_each_vcpu(i, vcpu, kvm) 1872 vcpu->arch.sie_block->epoch = kvm->arch.epoch; 1873 kvm_s390_vcpu_unblock_all(kvm); 1874 preempt_enable(); 1875 mutex_unlock(&kvm->lock); 1876} 1877 1878/** 1879 * kvm_arch_fault_in_page - fault-in guest page if necessary 1880 * @vcpu: The corresponding virtual cpu 1881 * @gpa: Guest physical address 1882 * @writable: Whether the page should be writable or not 1883 * 1884 * Make sure that a guest page has been faulted-in on the host. 1885 * 1886 * Return: Zero on success, negative error code otherwise. 1887 */ 1888long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable) 1889{ 1890 return gmap_fault(vcpu->arch.gmap, gpa, 1891 writable ? FAULT_FLAG_WRITE : 0); 1892} 1893 1894static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, 1895 unsigned long token) 1896{ 1897 struct kvm_s390_interrupt inti; 1898 struct kvm_s390_irq irq; 1899 1900 if (start_token) { 1901 irq.u.ext.ext_params2 = token; 1902 irq.type = KVM_S390_INT_PFAULT_INIT; 1903 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq)); 1904 } else { 1905 inti.type = KVM_S390_INT_PFAULT_DONE; 1906 inti.parm64 = token; 1907 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti)); 1908 } 1909} 1910 1911void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 1912 struct kvm_async_pf *work) 1913{ 1914 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); 1915 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); 1916} 1917 1918void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 1919 struct kvm_async_pf *work) 1920{ 1921 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); 1922 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); 1923} 1924 1925void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, 1926 struct kvm_async_pf *work) 1927{ 1928 /* s390 will always inject the page directly */ 1929} 1930 1931bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) 1932{ 1933 /* 1934 * s390 will always inject the page directly, 1935 * but we still want check_async_completion to cleanup 1936 */ 1937 return true; 1938} 1939 1940static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) 1941{ 1942 hva_t hva; 1943 struct kvm_arch_async_pf arch; 1944 int rc; 1945 1946 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 1947 return 0; 1948 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != 1949 vcpu->arch.pfault_compare) 1950 return 0; 1951 if (psw_extint_disabled(vcpu)) 1952 return 0; 1953 if (kvm_s390_vcpu_has_irq(vcpu, 0)) 1954 return 0; 1955 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul)) 1956 return 0; 1957 if (!vcpu->arch.gmap->pfault_enabled) 1958 return 0; 1959 1960 hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr)); 1961 hva += current->thread.gmap_addr & ~PAGE_MASK; 1962 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) 1963 return 0; 1964 1965 rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch); 1966 return rc; 1967} 1968 1969static int vcpu_pre_run(struct kvm_vcpu *vcpu) 1970{ 1971 int rc, cpuflags; 1972 1973 /* 1974 * On s390 notifications for arriving pages will be delivered directly 1975 * to the guest but the house keeping for completed pfaults is 1976 * handled outside the worker. 1977 */ 1978 kvm_check_async_pf_completion(vcpu); 1979 1980 memcpy(&vcpu->arch.sie_block->gg14, &vcpu->run->s.regs.gprs[14], 16); 1981 1982 if (need_resched()) 1983 schedule(); 1984 1985 if (test_cpu_flag(CIF_MCCK_PENDING)) 1986 s390_handle_mcck(); 1987 1988 if (!kvm_is_ucontrol(vcpu->kvm)) { 1989 rc = kvm_s390_deliver_pending_interrupts(vcpu); 1990 if (rc) 1991 return rc; 1992 } 1993 1994 rc = kvm_s390_handle_requests(vcpu); 1995 if (rc) 1996 return rc; 1997 1998 if (guestdbg_enabled(vcpu)) { 1999 kvm_s390_backup_guest_per_regs(vcpu); 2000 kvm_s390_patch_guest_per_regs(vcpu); 2001 } 2002 2003 vcpu->arch.sie_block->icptcode = 0; 2004 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); 2005 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); 2006 trace_kvm_s390_sie_enter(vcpu, cpuflags); 2007 2008 return 0; 2009} 2010 2011static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu) 2012{ 2013 psw_t *psw = &vcpu->arch.sie_block->gpsw; 2014 u8 opcode; 2015 int rc; 2016 2017 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); 2018 trace_kvm_s390_sie_fault(vcpu); 2019 2020 /* 2021 * We want to inject an addressing exception, which is defined as a 2022 * suppressing or terminating exception. However, since we came here 2023 * by a DAT access exception, the PSW still points to the faulting 2024 * instruction since DAT exceptions are nullifying. So we've got 2025 * to look up the current opcode to get the length of the instruction 2026 * to be able to forward the PSW. 2027 */ 2028 rc = read_guest(vcpu, psw->addr, 0, &opcode, 1); 2029 if (rc) 2030 return kvm_s390_inject_prog_cond(vcpu, rc); 2031 psw->addr = __rewind_psw(*psw, -insn_length(opcode)); 2032 2033 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 2034} 2035 2036static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) 2037{ 2038 int rc = -1; 2039 2040 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", 2041 vcpu->arch.sie_block->icptcode); 2042 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); 2043 2044 if (guestdbg_enabled(vcpu)) 2045 kvm_s390_restore_guest_per_regs(vcpu); 2046 2047 if (exit_reason >= 0) { 2048 rc = 0; 2049 } else if (kvm_is_ucontrol(vcpu->kvm)) { 2050 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; 2051 vcpu->run->s390_ucontrol.trans_exc_code = 2052 current->thread.gmap_addr; 2053 vcpu->run->s390_ucontrol.pgm_code = 0x10; 2054 rc = -EREMOTE; 2055 2056 } else if (current->thread.gmap_pfault) { 2057 trace_kvm_s390_major_guest_pfault(vcpu); 2058 current->thread.gmap_pfault = 0; 2059 if (kvm_arch_setup_async_pf(vcpu)) { 2060 rc = 0; 2061 } else { 2062 gpa_t gpa = current->thread.gmap_addr; 2063 rc = kvm_arch_fault_in_page(vcpu, gpa, 1); 2064 } 2065 } 2066 2067 if (rc == -1) 2068 rc = vcpu_post_run_fault_in_sie(vcpu); 2069 2070 memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16); 2071 2072 if (rc == 0) { 2073 if (kvm_is_ucontrol(vcpu->kvm)) 2074 /* Don't exit for host interrupts. */ 2075 rc = vcpu->arch.sie_block->icptcode ? -EOPNOTSUPP : 0; 2076 else 2077 rc = kvm_handle_sie_intercept(vcpu); 2078 } 2079 2080 return rc; 2081} 2082 2083static int __vcpu_run(struct kvm_vcpu *vcpu) 2084{ 2085 int rc, exit_reason; 2086 2087 /* 2088 * We try to hold kvm->srcu during most of vcpu_run (except when run- 2089 * ning the guest), so that memslots (and other stuff) are protected 2090 */ 2091 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 2092 2093 do { 2094 rc = vcpu_pre_run(vcpu); 2095 if (rc) 2096 break; 2097 2098 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 2099 /* 2100 * As PF_VCPU will be used in fault handler, between 2101 * guest_enter and guest_exit should be no uaccess. 2102 */ 2103 local_irq_disable(); 2104 __kvm_guest_enter(); 2105 local_irq_enable(); 2106 exit_reason = sie64a(vcpu->arch.sie_block, 2107 vcpu->run->s.regs.gprs); 2108 local_irq_disable(); 2109 __kvm_guest_exit(); 2110 local_irq_enable(); 2111 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 2112 2113 rc = vcpu_post_run(vcpu, exit_reason); 2114 } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc); 2115 2116 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 2117 return rc; 2118} 2119 2120static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 2121{ 2122 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; 2123 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; 2124 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) 2125 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); 2126 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { 2127 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); 2128 /* some control register changes require a tlb flush */ 2129 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 2130 } 2131 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 2132 vcpu->arch.sie_block->cputm = kvm_run->s.regs.cputm; 2133 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc; 2134 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr; 2135 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp; 2136 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea; 2137 } 2138 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) { 2139 vcpu->arch.pfault_token = kvm_run->s.regs.pft; 2140 vcpu->arch.pfault_select = kvm_run->s.regs.pfs; 2141 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc; 2142 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 2143 kvm_clear_async_pf_completion_queue(vcpu); 2144 } 2145 kvm_run->kvm_dirty_regs = 0; 2146} 2147 2148static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 2149{ 2150 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; 2151 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; 2152 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu); 2153 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); 2154 kvm_run->s.regs.cputm = vcpu->arch.sie_block->cputm; 2155 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc; 2156 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr; 2157 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp; 2158 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea; 2159 kvm_run->s.regs.pft = vcpu->arch.pfault_token; 2160 kvm_run->s.regs.pfs = vcpu->arch.pfault_select; 2161 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare; 2162} 2163 2164int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 2165{ 2166 int rc; 2167 sigset_t sigsaved; 2168 2169 if (guestdbg_exit_pending(vcpu)) { 2170 kvm_s390_prepare_debug_exit(vcpu); 2171 return 0; 2172 } 2173 2174 if (vcpu->sigset_active) 2175 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); 2176 2177 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) { 2178 kvm_s390_vcpu_start(vcpu); 2179 } else if (is_vcpu_stopped(vcpu)) { 2180 pr_err_ratelimited("can't run stopped vcpu %d\n", 2181 vcpu->vcpu_id); 2182 return -EINVAL; 2183 } 2184 2185 sync_regs(vcpu, kvm_run); 2186 2187 might_fault(); 2188 rc = __vcpu_run(vcpu); 2189 2190 if (signal_pending(current) && !rc) { 2191 kvm_run->exit_reason = KVM_EXIT_INTR; 2192 rc = -EINTR; 2193 } 2194 2195 if (guestdbg_exit_pending(vcpu) && !rc) { 2196 kvm_s390_prepare_debug_exit(vcpu); 2197 rc = 0; 2198 } 2199 2200 if (rc == -EOPNOTSUPP) { 2201 /* intercept cannot be handled in-kernel, prepare kvm-run */ 2202 kvm_run->exit_reason = KVM_EXIT_S390_SIEIC; 2203 kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; 2204 kvm_run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; 2205 kvm_run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; 2206 rc = 0; 2207 } 2208 2209 if (rc == -EREMOTE) { 2210 /* intercept was handled, but userspace support is needed 2211 * kvm_run has been prepared by the handler */ 2212 rc = 0; 2213 } 2214 2215 store_regs(vcpu, kvm_run); 2216 2217 if (vcpu->sigset_active) 2218 sigprocmask(SIG_SETMASK, &sigsaved, NULL); 2219 2220 vcpu->stat.exit_userspace++; 2221 return rc; 2222} 2223 2224/* 2225 * store status at address 2226 * we use have two special cases: 2227 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit 2228 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix 2229 */ 2230int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) 2231{ 2232 unsigned char archmode = 1; 2233 freg_t fprs[NUM_FPRS]; 2234 unsigned int px; 2235 u64 clkcomp; 2236 int rc; 2237 2238 px = kvm_s390_get_prefix(vcpu); 2239 if (gpa == KVM_S390_STORE_STATUS_NOADDR) { 2240 if (write_guest_abs(vcpu, 163, &archmode, 1)) 2241 return -EFAULT; 2242 gpa = 0; 2243 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { 2244 if (write_guest_real(vcpu, 163, &archmode, 1)) 2245 return -EFAULT; 2246 gpa = px; 2247 } else 2248 gpa -= __LC_FPREGS_SAVE_AREA; 2249 2250 /* manually convert vector registers if necessary */ 2251 if (MACHINE_HAS_VX) { 2252 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs); 2253 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 2254 fprs, 128); 2255 } else { 2256 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 2257 vcpu->run->s.regs.vrs, 128); 2258 } 2259 rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA, 2260 vcpu->run->s.regs.gprs, 128); 2261 rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA, 2262 &vcpu->arch.sie_block->gpsw, 16); 2263 rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA, 2264 &px, 4); 2265 rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA, 2266 &vcpu->run->s.regs.fpc, 4); 2267 rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA, 2268 &vcpu->arch.sie_block->todpr, 4); 2269 rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA, 2270 &vcpu->arch.sie_block->cputm, 8); 2271 clkcomp = vcpu->arch.sie_block->ckc >> 8; 2272 rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA, 2273 &clkcomp, 8); 2274 rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA, 2275 &vcpu->run->s.regs.acrs, 64); 2276 rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA, 2277 &vcpu->arch.sie_block->gcr, 128); 2278 return rc ? -EFAULT : 0; 2279} 2280 2281int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) 2282{ 2283 /* 2284 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy 2285 * copying in vcpu load/put. Lets update our copies before we save 2286 * it into the save area 2287 */ 2288 save_fpu_regs(); 2289 vcpu->run->s.regs.fpc = current->thread.fpu.fpc; 2290 save_access_regs(vcpu->run->s.regs.acrs); 2291 2292 return kvm_s390_store_status_unloaded(vcpu, addr); 2293} 2294 2295/* 2296 * store additional status at address 2297 */ 2298int kvm_s390_store_adtl_status_unloaded(struct kvm_vcpu *vcpu, 2299 unsigned long gpa) 2300{ 2301 /* Only bits 0-53 are used for address formation */ 2302 if (!(gpa & ~0x3ff)) 2303 return 0; 2304 2305 return write_guest_abs(vcpu, gpa & ~0x3ff, 2306 (void *)&vcpu->run->s.regs.vrs, 512); 2307} 2308 2309int kvm_s390_vcpu_store_adtl_status(struct kvm_vcpu *vcpu, unsigned long addr) 2310{ 2311 if (!test_kvm_facility(vcpu->kvm, 129)) 2312 return 0; 2313 2314 /* 2315 * The guest VXRS are in the host VXRs due to the lazy 2316 * copying in vcpu load/put. We can simply call save_fpu_regs() 2317 * to save the current register state because we are in the 2318 * middle of a load/put cycle. 2319 * 2320 * Let's update our copies before we save it into the save area. 2321 */ 2322 save_fpu_regs(); 2323 2324 return kvm_s390_store_adtl_status_unloaded(vcpu, addr); 2325} 2326 2327static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 2328{ 2329 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); 2330 kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu); 2331} 2332 2333static void __disable_ibs_on_all_vcpus(struct kvm *kvm) 2334{ 2335 unsigned int i; 2336 struct kvm_vcpu *vcpu; 2337 2338 kvm_for_each_vcpu(i, vcpu, kvm) { 2339 __disable_ibs_on_vcpu(vcpu); 2340 } 2341} 2342 2343static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 2344{ 2345 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); 2346 kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu); 2347} 2348 2349void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) 2350{ 2351 int i, online_vcpus, started_vcpus = 0; 2352 2353 if (!is_vcpu_stopped(vcpu)) 2354 return; 2355 2356 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); 2357 /* Only one cpu at a time may enter/leave the STOPPED state. */ 2358 spin_lock(&vcpu->kvm->arch.start_stop_lock); 2359 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 2360 2361 for (i = 0; i < online_vcpus; i++) { 2362 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) 2363 started_vcpus++; 2364 } 2365 2366 if (started_vcpus == 0) { 2367 /* we're the only active VCPU -> speed it up */ 2368 __enable_ibs_on_vcpu(vcpu); 2369 } else if (started_vcpus == 1) { 2370 /* 2371 * As we are starting a second VCPU, we have to disable 2372 * the IBS facility on all VCPUs to remove potentially 2373 * oustanding ENABLE requests. 2374 */ 2375 __disable_ibs_on_all_vcpus(vcpu->kvm); 2376 } 2377 2378 atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags); 2379 /* 2380 * Another VCPU might have used IBS while we were offline. 2381 * Let's play safe and flush the VCPU at startup. 2382 */ 2383 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 2384 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 2385 return; 2386} 2387 2388void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) 2389{ 2390 int i, online_vcpus, started_vcpus = 0; 2391 struct kvm_vcpu *started_vcpu = NULL; 2392 2393 if (is_vcpu_stopped(vcpu)) 2394 return; 2395 2396 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); 2397 /* Only one cpu at a time may enter/leave the STOPPED state. */ 2398 spin_lock(&vcpu->kvm->arch.start_stop_lock); 2399 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 2400 2401 /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */ 2402 kvm_s390_clear_stop_irq(vcpu); 2403 2404 atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags); 2405 __disable_ibs_on_vcpu(vcpu); 2406 2407 for (i = 0; i < online_vcpus; i++) { 2408 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) { 2409 started_vcpus++; 2410 started_vcpu = vcpu->kvm->vcpus[i]; 2411 } 2412 } 2413 2414 if (started_vcpus == 1) { 2415 /* 2416 * As we only have one VCPU left, we want to enable the 2417 * IBS facility for that VCPU to speed it up. 2418 */ 2419 __enable_ibs_on_vcpu(started_vcpu); 2420 } 2421 2422 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 2423 return; 2424} 2425 2426static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 2427 struct kvm_enable_cap *cap) 2428{ 2429 int r; 2430 2431 if (cap->flags) 2432 return -EINVAL; 2433 2434 switch (cap->cap) { 2435 case KVM_CAP_S390_CSS_SUPPORT: 2436 if (!vcpu->kvm->arch.css_support) { 2437 vcpu->kvm->arch.css_support = 1; 2438 VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support"); 2439 trace_kvm_s390_enable_css(vcpu->kvm); 2440 } 2441 r = 0; 2442 break; 2443 default: 2444 r = -EINVAL; 2445 break; 2446 } 2447 return r; 2448} 2449 2450static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu, 2451 struct kvm_s390_mem_op *mop) 2452{ 2453 void __user *uaddr = (void __user *)mop->buf; 2454 void *tmpbuf = NULL; 2455 int r, srcu_idx; 2456 const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION 2457 | KVM_S390_MEMOP_F_CHECK_ONLY; 2458 2459 if (mop->flags & ~supported_flags) 2460 return -EINVAL; 2461 2462 if (mop->size > MEM_OP_MAX_SIZE) 2463 return -E2BIG; 2464 2465 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 2466 tmpbuf = vmalloc(mop->size); 2467 if (!tmpbuf) 2468 return -ENOMEM; 2469 } 2470 2471 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 2472 2473 switch (mop->op) { 2474 case KVM_S390_MEMOP_LOGICAL_READ: 2475 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 2476 r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, false); 2477 break; 2478 } 2479 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size); 2480 if (r == 0) { 2481 if (copy_to_user(uaddr, tmpbuf, mop->size)) 2482 r = -EFAULT; 2483 } 2484 break; 2485 case KVM_S390_MEMOP_LOGICAL_WRITE: 2486 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 2487 r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, true); 2488 break; 2489 } 2490 if (copy_from_user(tmpbuf, uaddr, mop->size)) { 2491 r = -EFAULT; 2492 break; 2493 } 2494 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size); 2495 break; 2496 default: 2497 r = -EINVAL; 2498 } 2499 2500 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 2501 2502 if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0) 2503 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 2504 2505 vfree(tmpbuf); 2506 return r; 2507} 2508 2509long kvm_arch_vcpu_ioctl(struct file *filp, 2510 unsigned int ioctl, unsigned long arg) 2511{ 2512 struct kvm_vcpu *vcpu = filp->private_data; 2513 void __user *argp = (void __user *)arg; 2514 int idx; 2515 long r; 2516 2517 switch (ioctl) { 2518 case KVM_S390_IRQ: { 2519 struct kvm_s390_irq s390irq; 2520 2521 r = -EFAULT; 2522 if (copy_from_user(&s390irq, argp, sizeof(s390irq))) 2523 break; 2524 r = kvm_s390_inject_vcpu(vcpu, &s390irq); 2525 break; 2526 } 2527 case KVM_S390_INTERRUPT: { 2528 struct kvm_s390_interrupt s390int; 2529 struct kvm_s390_irq s390irq; 2530 2531 r = -EFAULT; 2532 if (copy_from_user(&s390int, argp, sizeof(s390int))) 2533 break; 2534 if (s390int_to_s390irq(&s390int, &s390irq)) 2535 return -EINVAL; 2536 r = kvm_s390_inject_vcpu(vcpu, &s390irq); 2537 break; 2538 } 2539 case KVM_S390_STORE_STATUS: 2540 idx = srcu_read_lock(&vcpu->kvm->srcu); 2541 r = kvm_s390_vcpu_store_status(vcpu, arg); 2542 srcu_read_unlock(&vcpu->kvm->srcu, idx); 2543 break; 2544 case KVM_S390_SET_INITIAL_PSW: { 2545 psw_t psw; 2546 2547 r = -EFAULT; 2548 if (copy_from_user(&psw, argp, sizeof(psw))) 2549 break; 2550 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); 2551 break; 2552 } 2553 case KVM_S390_INITIAL_RESET: 2554 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu); 2555 break; 2556 case KVM_SET_ONE_REG: 2557 case KVM_GET_ONE_REG: { 2558 struct kvm_one_reg reg; 2559 r = -EFAULT; 2560 if (copy_from_user(®, argp, sizeof(reg))) 2561 break; 2562 if (ioctl == KVM_SET_ONE_REG) 2563 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); 2564 else 2565 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); 2566 break; 2567 } 2568#ifdef CONFIG_KVM_S390_UCONTROL 2569 case KVM_S390_UCAS_MAP: { 2570 struct kvm_s390_ucas_mapping ucasmap; 2571 2572 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 2573 r = -EFAULT; 2574 break; 2575 } 2576 2577 if (!kvm_is_ucontrol(vcpu->kvm)) { 2578 r = -EINVAL; 2579 break; 2580 } 2581 2582 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr, 2583 ucasmap.vcpu_addr, ucasmap.length); 2584 break; 2585 } 2586 case KVM_S390_UCAS_UNMAP: { 2587 struct kvm_s390_ucas_mapping ucasmap; 2588 2589 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 2590 r = -EFAULT; 2591 break; 2592 } 2593 2594 if (!kvm_is_ucontrol(vcpu->kvm)) { 2595 r = -EINVAL; 2596 break; 2597 } 2598 2599 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr, 2600 ucasmap.length); 2601 break; 2602 } 2603#endif 2604 case KVM_S390_VCPU_FAULT: { 2605 r = gmap_fault(vcpu->arch.gmap, arg, 0); 2606 break; 2607 } 2608 case KVM_ENABLE_CAP: 2609 { 2610 struct kvm_enable_cap cap; 2611 r = -EFAULT; 2612 if (copy_from_user(&cap, argp, sizeof(cap))) 2613 break; 2614 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 2615 break; 2616 } 2617 case KVM_S390_MEM_OP: { 2618 struct kvm_s390_mem_op mem_op; 2619 2620 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 2621 r = kvm_s390_guest_mem_op(vcpu, &mem_op); 2622 else 2623 r = -EFAULT; 2624 break; 2625 } 2626 case KVM_S390_SET_IRQ_STATE: { 2627 struct kvm_s390_irq_state irq_state; 2628 2629 r = -EFAULT; 2630 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 2631 break; 2632 if (irq_state.len > VCPU_IRQS_MAX_BUF || 2633 irq_state.len == 0 || 2634 irq_state.len % sizeof(struct kvm_s390_irq) > 0) { 2635 r = -EINVAL; 2636 break; 2637 } 2638 r = kvm_s390_set_irq_state(vcpu, 2639 (void __user *) irq_state.buf, 2640 irq_state.len); 2641 break; 2642 } 2643 case KVM_S390_GET_IRQ_STATE: { 2644 struct kvm_s390_irq_state irq_state; 2645 2646 r = -EFAULT; 2647 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 2648 break; 2649 if (irq_state.len == 0) { 2650 r = -EINVAL; 2651 break; 2652 } 2653 r = kvm_s390_get_irq_state(vcpu, 2654 (__u8 __user *) irq_state.buf, 2655 irq_state.len); 2656 break; 2657 } 2658 default: 2659 r = -ENOTTY; 2660 } 2661 return r; 2662} 2663 2664int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 2665{ 2666#ifdef CONFIG_KVM_S390_UCONTROL 2667 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) 2668 && (kvm_is_ucontrol(vcpu->kvm))) { 2669 vmf->page = virt_to_page(vcpu->arch.sie_block); 2670 get_page(vmf->page); 2671 return 0; 2672 } 2673#endif 2674 return VM_FAULT_SIGBUS; 2675} 2676 2677int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, 2678 unsigned long npages) 2679{ 2680 return 0; 2681} 2682 2683/* Section: memory related */ 2684int kvm_arch_prepare_memory_region(struct kvm *kvm, 2685 struct kvm_memory_slot *memslot, 2686 const struct kvm_userspace_memory_region *mem, 2687 enum kvm_mr_change change) 2688{ 2689 /* A few sanity checks. We can have memory slots which have to be 2690 located/ended at a segment boundary (1MB). The memory in userland is 2691 ok to be fragmented into various different vmas. It is okay to mmap() 2692 and munmap() stuff in this slot after doing this call at any time */ 2693 2694 if (mem->userspace_addr & 0xffffful) 2695 return -EINVAL; 2696 2697 if (mem->memory_size & 0xffffful) 2698 return -EINVAL; 2699 2700 return 0; 2701} 2702 2703void kvm_arch_commit_memory_region(struct kvm *kvm, 2704 const struct kvm_userspace_memory_region *mem, 2705 const struct kvm_memory_slot *old, 2706 const struct kvm_memory_slot *new, 2707 enum kvm_mr_change change) 2708{ 2709 int rc; 2710 2711 /* If the basics of the memslot do not change, we do not want 2712 * to update the gmap. Every update causes several unnecessary 2713 * segment translation exceptions. This is usually handled just 2714 * fine by the normal fault handler + gmap, but it will also 2715 * cause faults on the prefix page of running guest CPUs. 2716 */ 2717 if (old->userspace_addr == mem->userspace_addr && 2718 old->base_gfn * PAGE_SIZE == mem->guest_phys_addr && 2719 old->npages * PAGE_SIZE == mem->memory_size) 2720 return; 2721 2722 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr, 2723 mem->guest_phys_addr, mem->memory_size); 2724 if (rc) 2725 pr_warn("failed to commit memory region\n"); 2726 return; 2727} 2728 2729static int __init kvm_s390_init(void) 2730{ 2731 return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); 2732} 2733 2734static void __exit kvm_s390_exit(void) 2735{ 2736 kvm_exit(); 2737} 2738 2739module_init(kvm_s390_init); 2740module_exit(kvm_s390_exit); 2741 2742/* 2743 * Enable autoloading of the kvm module. 2744 * Note that we add the module alias here instead of virt/kvm/kvm_main.c 2745 * since x86 takes a different approach. 2746 */ 2747#include <linux/miscdevice.h> 2748MODULE_ALIAS_MISCDEV(KVM_MINOR); 2749MODULE_ALIAS("devname:kvm"); 2750