| 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 <asm/asm-offsets.h> |
| 29 | #include <asm/lowcore.h> |
| 30 | #include <asm/pgtable.h> |
| 31 | #include <asm/nmi.h> |
| 32 | #include <asm/switch_to.h> |
| 33 | #include <asm/sclp.h> |
| 34 | #include "kvm-s390.h" |
| 35 | #include "gaccess.h" |
| 36 | |
| 37 | #define CREATE_TRACE_POINTS |
| 38 | #include "trace.h" |
| 39 | #include "trace-s390.h" |
| 40 | |
| 41 | #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU |
| 42 | |
| 43 | struct kvm_stats_debugfs_item debugfs_entries[] = { |
| 44 | { "userspace_handled", VCPU_STAT(exit_userspace) }, |
| 45 | { "exit_null", VCPU_STAT(exit_null) }, |
| 46 | { "exit_validity", VCPU_STAT(exit_validity) }, |
| 47 | { "exit_stop_request", VCPU_STAT(exit_stop_request) }, |
| 48 | { "exit_external_request", VCPU_STAT(exit_external_request) }, |
| 49 | { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) }, |
| 50 | { "exit_instruction", VCPU_STAT(exit_instruction) }, |
| 51 | { "exit_program_interruption", VCPU_STAT(exit_program_interruption) }, |
| 52 | { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) }, |
| 53 | { "halt_successful_poll", VCPU_STAT(halt_successful_poll) }, |
| 54 | { "halt_wakeup", VCPU_STAT(halt_wakeup) }, |
| 55 | { "instruction_lctlg", VCPU_STAT(instruction_lctlg) }, |
| 56 | { "instruction_lctl", VCPU_STAT(instruction_lctl) }, |
| 57 | { "instruction_stctl", VCPU_STAT(instruction_stctl) }, |
| 58 | { "instruction_stctg", VCPU_STAT(instruction_stctg) }, |
| 59 | { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) }, |
| 60 | { "deliver_external_call", VCPU_STAT(deliver_external_call) }, |
| 61 | { "deliver_service_signal", VCPU_STAT(deliver_service_signal) }, |
| 62 | { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) }, |
| 63 | { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) }, |
| 64 | { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) }, |
| 65 | { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) }, |
| 66 | { "deliver_program_interruption", VCPU_STAT(deliver_program_int) }, |
| 67 | { "exit_wait_state", VCPU_STAT(exit_wait_state) }, |
| 68 | { "instruction_pfmf", VCPU_STAT(instruction_pfmf) }, |
| 69 | { "instruction_stidp", VCPU_STAT(instruction_stidp) }, |
| 70 | { "instruction_spx", VCPU_STAT(instruction_spx) }, |
| 71 | { "instruction_stpx", VCPU_STAT(instruction_stpx) }, |
| 72 | { "instruction_stap", VCPU_STAT(instruction_stap) }, |
| 73 | { "instruction_storage_key", VCPU_STAT(instruction_storage_key) }, |
| 74 | { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) }, |
| 75 | { "instruction_stsch", VCPU_STAT(instruction_stsch) }, |
| 76 | { "instruction_chsc", VCPU_STAT(instruction_chsc) }, |
| 77 | { "instruction_essa", VCPU_STAT(instruction_essa) }, |
| 78 | { "instruction_stsi", VCPU_STAT(instruction_stsi) }, |
| 79 | { "instruction_stfl", VCPU_STAT(instruction_stfl) }, |
| 80 | { "instruction_tprot", VCPU_STAT(instruction_tprot) }, |
| 81 | { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) }, |
| 82 | { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) }, |
| 83 | { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) }, |
| 84 | { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) }, |
| 85 | { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) }, |
| 86 | { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) }, |
| 87 | { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) }, |
| 88 | { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) }, |
| 89 | { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) }, |
| 90 | { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) }, |
| 91 | { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) }, |
| 92 | { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) }, |
| 93 | { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) }, |
| 94 | { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) }, |
| 95 | { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) }, |
| 96 | { "diagnose_10", VCPU_STAT(diagnose_10) }, |
| 97 | { "diagnose_44", VCPU_STAT(diagnose_44) }, |
| 98 | { "diagnose_9c", VCPU_STAT(diagnose_9c) }, |
| 99 | { NULL } |
| 100 | }; |
| 101 | |
| 102 | /* upper facilities limit for kvm */ |
| 103 | unsigned long kvm_s390_fac_list_mask[] = { |
| 104 | 0xff82fffbf4fc2000UL, |
| 105 | 0x005c000000000000UL, |
| 106 | }; |
| 107 | |
| 108 | unsigned long kvm_s390_fac_list_mask_size(void) |
| 109 | { |
| 110 | BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64); |
| 111 | return ARRAY_SIZE(kvm_s390_fac_list_mask); |
| 112 | } |
| 113 | |
| 114 | static struct gmap_notifier gmap_notifier; |
| 115 | |
| 116 | /* Section: not file related */ |
| 117 | int kvm_arch_hardware_enable(void) |
| 118 | { |
| 119 | /* every s390 is virtualization enabled ;-) */ |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address); |
| 124 | |
| 125 | int kvm_arch_hardware_setup(void) |
| 126 | { |
| 127 | gmap_notifier.notifier_call = kvm_gmap_notifier; |
| 128 | gmap_register_ipte_notifier(&gmap_notifier); |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | void kvm_arch_hardware_unsetup(void) |
| 133 | { |
| 134 | gmap_unregister_ipte_notifier(&gmap_notifier); |
| 135 | } |
| 136 | |
| 137 | int kvm_arch_init(void *opaque) |
| 138 | { |
| 139 | /* Register floating interrupt controller interface. */ |
| 140 | return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC); |
| 141 | } |
| 142 | |
| 143 | /* Section: device related */ |
| 144 | long kvm_arch_dev_ioctl(struct file *filp, |
| 145 | unsigned int ioctl, unsigned long arg) |
| 146 | { |
| 147 | if (ioctl == KVM_S390_ENABLE_SIE) |
| 148 | return s390_enable_sie(); |
| 149 | return -EINVAL; |
| 150 | } |
| 151 | |
| 152 | int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) |
| 153 | { |
| 154 | int r; |
| 155 | |
| 156 | switch (ext) { |
| 157 | case KVM_CAP_S390_PSW: |
| 158 | case KVM_CAP_S390_GMAP: |
| 159 | case KVM_CAP_SYNC_MMU: |
| 160 | #ifdef CONFIG_KVM_S390_UCONTROL |
| 161 | case KVM_CAP_S390_UCONTROL: |
| 162 | #endif |
| 163 | case KVM_CAP_ASYNC_PF: |
| 164 | case KVM_CAP_SYNC_REGS: |
| 165 | case KVM_CAP_ONE_REG: |
| 166 | case KVM_CAP_ENABLE_CAP: |
| 167 | case KVM_CAP_S390_CSS_SUPPORT: |
| 168 | case KVM_CAP_IOEVENTFD: |
| 169 | case KVM_CAP_DEVICE_CTRL: |
| 170 | case KVM_CAP_ENABLE_CAP_VM: |
| 171 | case KVM_CAP_S390_IRQCHIP: |
| 172 | case KVM_CAP_VM_ATTRIBUTES: |
| 173 | case KVM_CAP_MP_STATE: |
| 174 | case KVM_CAP_S390_USER_SIGP: |
| 175 | r = 1; |
| 176 | break; |
| 177 | case KVM_CAP_NR_VCPUS: |
| 178 | case KVM_CAP_MAX_VCPUS: |
| 179 | r = KVM_MAX_VCPUS; |
| 180 | break; |
| 181 | case KVM_CAP_NR_MEMSLOTS: |
| 182 | r = KVM_USER_MEM_SLOTS; |
| 183 | break; |
| 184 | case KVM_CAP_S390_COW: |
| 185 | r = MACHINE_HAS_ESOP; |
| 186 | break; |
| 187 | default: |
| 188 | r = 0; |
| 189 | } |
| 190 | return r; |
| 191 | } |
| 192 | |
| 193 | static void kvm_s390_sync_dirty_log(struct kvm *kvm, |
| 194 | struct kvm_memory_slot *memslot) |
| 195 | { |
| 196 | gfn_t cur_gfn, last_gfn; |
| 197 | unsigned long address; |
| 198 | struct gmap *gmap = kvm->arch.gmap; |
| 199 | |
| 200 | down_read(&gmap->mm->mmap_sem); |
| 201 | /* Loop over all guest pages */ |
| 202 | last_gfn = memslot->base_gfn + memslot->npages; |
| 203 | for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) { |
| 204 | address = gfn_to_hva_memslot(memslot, cur_gfn); |
| 205 | |
| 206 | if (gmap_test_and_clear_dirty(address, gmap)) |
| 207 | mark_page_dirty(kvm, cur_gfn); |
| 208 | } |
| 209 | up_read(&gmap->mm->mmap_sem); |
| 210 | } |
| 211 | |
| 212 | /* Section: vm related */ |
| 213 | /* |
| 214 | * Get (and clear) the dirty memory log for a memory slot. |
| 215 | */ |
| 216 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, |
| 217 | struct kvm_dirty_log *log) |
| 218 | { |
| 219 | int r; |
| 220 | unsigned long n; |
| 221 | struct kvm_memory_slot *memslot; |
| 222 | int is_dirty = 0; |
| 223 | |
| 224 | mutex_lock(&kvm->slots_lock); |
| 225 | |
| 226 | r = -EINVAL; |
| 227 | if (log->slot >= KVM_USER_MEM_SLOTS) |
| 228 | goto out; |
| 229 | |
| 230 | memslot = id_to_memslot(kvm->memslots, log->slot); |
| 231 | r = -ENOENT; |
| 232 | if (!memslot->dirty_bitmap) |
| 233 | goto out; |
| 234 | |
| 235 | kvm_s390_sync_dirty_log(kvm, memslot); |
| 236 | r = kvm_get_dirty_log(kvm, log, &is_dirty); |
| 237 | if (r) |
| 238 | goto out; |
| 239 | |
| 240 | /* Clear the dirty log */ |
| 241 | if (is_dirty) { |
| 242 | n = kvm_dirty_bitmap_bytes(memslot); |
| 243 | memset(memslot->dirty_bitmap, 0, n); |
| 244 | } |
| 245 | r = 0; |
| 246 | out: |
| 247 | mutex_unlock(&kvm->slots_lock); |
| 248 | return r; |
| 249 | } |
| 250 | |
| 251 | static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) |
| 252 | { |
| 253 | int r; |
| 254 | |
| 255 | if (cap->flags) |
| 256 | return -EINVAL; |
| 257 | |
| 258 | switch (cap->cap) { |
| 259 | case KVM_CAP_S390_IRQCHIP: |
| 260 | kvm->arch.use_irqchip = 1; |
| 261 | r = 0; |
| 262 | break; |
| 263 | case KVM_CAP_S390_USER_SIGP: |
| 264 | kvm->arch.user_sigp = 1; |
| 265 | r = 0; |
| 266 | break; |
| 267 | default: |
| 268 | r = -EINVAL; |
| 269 | break; |
| 270 | } |
| 271 | return r; |
| 272 | } |
| 273 | |
| 274 | static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) |
| 275 | { |
| 276 | int ret; |
| 277 | |
| 278 | switch (attr->attr) { |
| 279 | case KVM_S390_VM_MEM_LIMIT_SIZE: |
| 280 | ret = 0; |
| 281 | if (put_user(kvm->arch.gmap->asce_end, (u64 __user *)attr->addr)) |
| 282 | ret = -EFAULT; |
| 283 | break; |
| 284 | default: |
| 285 | ret = -ENXIO; |
| 286 | break; |
| 287 | } |
| 288 | return ret; |
| 289 | } |
| 290 | |
| 291 | static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) |
| 292 | { |
| 293 | int ret; |
| 294 | unsigned int idx; |
| 295 | switch (attr->attr) { |
| 296 | case KVM_S390_VM_MEM_ENABLE_CMMA: |
| 297 | ret = -EBUSY; |
| 298 | mutex_lock(&kvm->lock); |
| 299 | if (atomic_read(&kvm->online_vcpus) == 0) { |
| 300 | kvm->arch.use_cmma = 1; |
| 301 | ret = 0; |
| 302 | } |
| 303 | mutex_unlock(&kvm->lock); |
| 304 | break; |
| 305 | case KVM_S390_VM_MEM_CLR_CMMA: |
| 306 | mutex_lock(&kvm->lock); |
| 307 | idx = srcu_read_lock(&kvm->srcu); |
| 308 | s390_reset_cmma(kvm->arch.gmap->mm); |
| 309 | srcu_read_unlock(&kvm->srcu, idx); |
| 310 | mutex_unlock(&kvm->lock); |
| 311 | ret = 0; |
| 312 | break; |
| 313 | case KVM_S390_VM_MEM_LIMIT_SIZE: { |
| 314 | unsigned long new_limit; |
| 315 | |
| 316 | if (kvm_is_ucontrol(kvm)) |
| 317 | return -EINVAL; |
| 318 | |
| 319 | if (get_user(new_limit, (u64 __user *)attr->addr)) |
| 320 | return -EFAULT; |
| 321 | |
| 322 | if (new_limit > kvm->arch.gmap->asce_end) |
| 323 | return -E2BIG; |
| 324 | |
| 325 | ret = -EBUSY; |
| 326 | mutex_lock(&kvm->lock); |
| 327 | if (atomic_read(&kvm->online_vcpus) == 0) { |
| 328 | /* gmap_alloc will round the limit up */ |
| 329 | struct gmap *new = gmap_alloc(current->mm, new_limit); |
| 330 | |
| 331 | if (!new) { |
| 332 | ret = -ENOMEM; |
| 333 | } else { |
| 334 | gmap_free(kvm->arch.gmap); |
| 335 | new->private = kvm; |
| 336 | kvm->arch.gmap = new; |
| 337 | ret = 0; |
| 338 | } |
| 339 | } |
| 340 | mutex_unlock(&kvm->lock); |
| 341 | break; |
| 342 | } |
| 343 | default: |
| 344 | ret = -ENXIO; |
| 345 | break; |
| 346 | } |
| 347 | return ret; |
| 348 | } |
| 349 | |
| 350 | static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); |
| 351 | |
| 352 | static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) |
| 353 | { |
| 354 | struct kvm_vcpu *vcpu; |
| 355 | int i; |
| 356 | |
| 357 | if (!test_kvm_facility(kvm, 76)) |
| 358 | return -EINVAL; |
| 359 | |
| 360 | mutex_lock(&kvm->lock); |
| 361 | switch (attr->attr) { |
| 362 | case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: |
| 363 | get_random_bytes( |
| 364 | kvm->arch.crypto.crycb->aes_wrapping_key_mask, |
| 365 | sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); |
| 366 | kvm->arch.crypto.aes_kw = 1; |
| 367 | break; |
| 368 | case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: |
| 369 | get_random_bytes( |
| 370 | kvm->arch.crypto.crycb->dea_wrapping_key_mask, |
| 371 | sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); |
| 372 | kvm->arch.crypto.dea_kw = 1; |
| 373 | break; |
| 374 | case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: |
| 375 | kvm->arch.crypto.aes_kw = 0; |
| 376 | memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, |
| 377 | sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); |
| 378 | break; |
| 379 | case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: |
| 380 | kvm->arch.crypto.dea_kw = 0; |
| 381 | memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, |
| 382 | sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); |
| 383 | break; |
| 384 | default: |
| 385 | mutex_unlock(&kvm->lock); |
| 386 | return -ENXIO; |
| 387 | } |
| 388 | |
| 389 | kvm_for_each_vcpu(i, vcpu, kvm) { |
| 390 | kvm_s390_vcpu_crypto_setup(vcpu); |
| 391 | exit_sie(vcpu); |
| 392 | } |
| 393 | mutex_unlock(&kvm->lock); |
| 394 | return 0; |
| 395 | } |
| 396 | |
| 397 | static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) |
| 398 | { |
| 399 | u8 gtod_high; |
| 400 | |
| 401 | if (copy_from_user(>od_high, (void __user *)attr->addr, |
| 402 | sizeof(gtod_high))) |
| 403 | return -EFAULT; |
| 404 | |
| 405 | if (gtod_high != 0) |
| 406 | return -EINVAL; |
| 407 | |
| 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) |
| 412 | { |
| 413 | struct kvm_vcpu *cur_vcpu; |
| 414 | unsigned int vcpu_idx; |
| 415 | u64 host_tod, gtod; |
| 416 | int r; |
| 417 | |
| 418 | if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) |
| 419 | return -EFAULT; |
| 420 | |
| 421 | r = store_tod_clock(&host_tod); |
| 422 | if (r) |
| 423 | return r; |
| 424 | |
| 425 | mutex_lock(&kvm->lock); |
| 426 | kvm->arch.epoch = gtod - host_tod; |
| 427 | kvm_for_each_vcpu(vcpu_idx, cur_vcpu, kvm) { |
| 428 | cur_vcpu->arch.sie_block->epoch = kvm->arch.epoch; |
| 429 | exit_sie(cur_vcpu); |
| 430 | } |
| 431 | mutex_unlock(&kvm->lock); |
| 432 | return 0; |
| 433 | } |
| 434 | |
| 435 | static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) |
| 436 | { |
| 437 | int ret; |
| 438 | |
| 439 | if (attr->flags) |
| 440 | return -EINVAL; |
| 441 | |
| 442 | switch (attr->attr) { |
| 443 | case KVM_S390_VM_TOD_HIGH: |
| 444 | ret = kvm_s390_set_tod_high(kvm, attr); |
| 445 | break; |
| 446 | case KVM_S390_VM_TOD_LOW: |
| 447 | ret = kvm_s390_set_tod_low(kvm, attr); |
| 448 | break; |
| 449 | default: |
| 450 | ret = -ENXIO; |
| 451 | break; |
| 452 | } |
| 453 | return ret; |
| 454 | } |
| 455 | |
| 456 | static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) |
| 457 | { |
| 458 | u8 gtod_high = 0; |
| 459 | |
| 460 | if (copy_to_user((void __user *)attr->addr, >od_high, |
| 461 | sizeof(gtod_high))) |
| 462 | return -EFAULT; |
| 463 | |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) |
| 468 | { |
| 469 | u64 host_tod, gtod; |
| 470 | int r; |
| 471 | |
| 472 | r = store_tod_clock(&host_tod); |
| 473 | if (r) |
| 474 | return r; |
| 475 | |
| 476 | gtod = host_tod + kvm->arch.epoch; |
| 477 | if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) |
| 478 | return -EFAULT; |
| 479 | |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) |
| 484 | { |
| 485 | int ret; |
| 486 | |
| 487 | if (attr->flags) |
| 488 | return -EINVAL; |
| 489 | |
| 490 | switch (attr->attr) { |
| 491 | case KVM_S390_VM_TOD_HIGH: |
| 492 | ret = kvm_s390_get_tod_high(kvm, attr); |
| 493 | break; |
| 494 | case KVM_S390_VM_TOD_LOW: |
| 495 | ret = kvm_s390_get_tod_low(kvm, attr); |
| 496 | break; |
| 497 | default: |
| 498 | ret = -ENXIO; |
| 499 | break; |
| 500 | } |
| 501 | return ret; |
| 502 | } |
| 503 | |
| 504 | static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) |
| 505 | { |
| 506 | struct kvm_s390_vm_cpu_processor *proc; |
| 507 | int ret = 0; |
| 508 | |
| 509 | mutex_lock(&kvm->lock); |
| 510 | if (atomic_read(&kvm->online_vcpus)) { |
| 511 | ret = -EBUSY; |
| 512 | goto out; |
| 513 | } |
| 514 | proc = kzalloc(sizeof(*proc), GFP_KERNEL); |
| 515 | if (!proc) { |
| 516 | ret = -ENOMEM; |
| 517 | goto out; |
| 518 | } |
| 519 | if (!copy_from_user(proc, (void __user *)attr->addr, |
| 520 | sizeof(*proc))) { |
| 521 | memcpy(&kvm->arch.model.cpu_id, &proc->cpuid, |
| 522 | sizeof(struct cpuid)); |
| 523 | kvm->arch.model.ibc = proc->ibc; |
| 524 | memcpy(kvm->arch.model.fac->list, proc->fac_list, |
| 525 | S390_ARCH_FAC_LIST_SIZE_BYTE); |
| 526 | } else |
| 527 | ret = -EFAULT; |
| 528 | kfree(proc); |
| 529 | out: |
| 530 | mutex_unlock(&kvm->lock); |
| 531 | return ret; |
| 532 | } |
| 533 | |
| 534 | static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) |
| 535 | { |
| 536 | int ret = -ENXIO; |
| 537 | |
| 538 | switch (attr->attr) { |
| 539 | case KVM_S390_VM_CPU_PROCESSOR: |
| 540 | ret = kvm_s390_set_processor(kvm, attr); |
| 541 | break; |
| 542 | } |
| 543 | return ret; |
| 544 | } |
| 545 | |
| 546 | static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr) |
| 547 | { |
| 548 | struct kvm_s390_vm_cpu_processor *proc; |
| 549 | int ret = 0; |
| 550 | |
| 551 | proc = kzalloc(sizeof(*proc), GFP_KERNEL); |
| 552 | if (!proc) { |
| 553 | ret = -ENOMEM; |
| 554 | goto out; |
| 555 | } |
| 556 | memcpy(&proc->cpuid, &kvm->arch.model.cpu_id, sizeof(struct cpuid)); |
| 557 | proc->ibc = kvm->arch.model.ibc; |
| 558 | memcpy(&proc->fac_list, kvm->arch.model.fac->list, S390_ARCH_FAC_LIST_SIZE_BYTE); |
| 559 | if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc))) |
| 560 | ret = -EFAULT; |
| 561 | kfree(proc); |
| 562 | out: |
| 563 | return ret; |
| 564 | } |
| 565 | |
| 566 | static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr) |
| 567 | { |
| 568 | struct kvm_s390_vm_cpu_machine *mach; |
| 569 | int ret = 0; |
| 570 | |
| 571 | mach = kzalloc(sizeof(*mach), GFP_KERNEL); |
| 572 | if (!mach) { |
| 573 | ret = -ENOMEM; |
| 574 | goto out; |
| 575 | } |
| 576 | get_cpu_id((struct cpuid *) &mach->cpuid); |
| 577 | mach->ibc = sclp_get_ibc(); |
| 578 | memcpy(&mach->fac_mask, kvm->arch.model.fac->mask, |
| 579 | S390_ARCH_FAC_LIST_SIZE_BYTE); |
| 580 | memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list, |
| 581 | S390_ARCH_FAC_LIST_SIZE_BYTE); |
| 582 | if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach))) |
| 583 | ret = -EFAULT; |
| 584 | kfree(mach); |
| 585 | out: |
| 586 | return ret; |
| 587 | } |
| 588 | |
| 589 | static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) |
| 590 | { |
| 591 | int ret = -ENXIO; |
| 592 | |
| 593 | switch (attr->attr) { |
| 594 | case KVM_S390_VM_CPU_PROCESSOR: |
| 595 | ret = kvm_s390_get_processor(kvm, attr); |
| 596 | break; |
| 597 | case KVM_S390_VM_CPU_MACHINE: |
| 598 | ret = kvm_s390_get_machine(kvm, attr); |
| 599 | break; |
| 600 | } |
| 601 | return ret; |
| 602 | } |
| 603 | |
| 604 | static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) |
| 605 | { |
| 606 | int ret; |
| 607 | |
| 608 | switch (attr->group) { |
| 609 | case KVM_S390_VM_MEM_CTRL: |
| 610 | ret = kvm_s390_set_mem_control(kvm, attr); |
| 611 | break; |
| 612 | case KVM_S390_VM_TOD: |
| 613 | ret = kvm_s390_set_tod(kvm, attr); |
| 614 | break; |
| 615 | case KVM_S390_VM_CPU_MODEL: |
| 616 | ret = kvm_s390_set_cpu_model(kvm, attr); |
| 617 | break; |
| 618 | case KVM_S390_VM_CRYPTO: |
| 619 | ret = kvm_s390_vm_set_crypto(kvm, attr); |
| 620 | break; |
| 621 | default: |
| 622 | ret = -ENXIO; |
| 623 | break; |
| 624 | } |
| 625 | |
| 626 | return ret; |
| 627 | } |
| 628 | |
| 629 | static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) |
| 630 | { |
| 631 | int ret; |
| 632 | |
| 633 | switch (attr->group) { |
| 634 | case KVM_S390_VM_MEM_CTRL: |
| 635 | ret = kvm_s390_get_mem_control(kvm, attr); |
| 636 | break; |
| 637 | case KVM_S390_VM_TOD: |
| 638 | ret = kvm_s390_get_tod(kvm, attr); |
| 639 | break; |
| 640 | case KVM_S390_VM_CPU_MODEL: |
| 641 | ret = kvm_s390_get_cpu_model(kvm, attr); |
| 642 | break; |
| 643 | default: |
| 644 | ret = -ENXIO; |
| 645 | break; |
| 646 | } |
| 647 | |
| 648 | return ret; |
| 649 | } |
| 650 | |
| 651 | static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) |
| 652 | { |
| 653 | int ret; |
| 654 | |
| 655 | switch (attr->group) { |
| 656 | case KVM_S390_VM_MEM_CTRL: |
| 657 | switch (attr->attr) { |
| 658 | case KVM_S390_VM_MEM_ENABLE_CMMA: |
| 659 | case KVM_S390_VM_MEM_CLR_CMMA: |
| 660 | case KVM_S390_VM_MEM_LIMIT_SIZE: |
| 661 | ret = 0; |
| 662 | break; |
| 663 | default: |
| 664 | ret = -ENXIO; |
| 665 | break; |
| 666 | } |
| 667 | break; |
| 668 | case KVM_S390_VM_TOD: |
| 669 | switch (attr->attr) { |
| 670 | case KVM_S390_VM_TOD_LOW: |
| 671 | case KVM_S390_VM_TOD_HIGH: |
| 672 | ret = 0; |
| 673 | break; |
| 674 | default: |
| 675 | ret = -ENXIO; |
| 676 | break; |
| 677 | } |
| 678 | break; |
| 679 | case KVM_S390_VM_CPU_MODEL: |
| 680 | switch (attr->attr) { |
| 681 | case KVM_S390_VM_CPU_PROCESSOR: |
| 682 | case KVM_S390_VM_CPU_MACHINE: |
| 683 | ret = 0; |
| 684 | break; |
| 685 | default: |
| 686 | ret = -ENXIO; |
| 687 | break; |
| 688 | } |
| 689 | break; |
| 690 | case KVM_S390_VM_CRYPTO: |
| 691 | switch (attr->attr) { |
| 692 | case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: |
| 693 | case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: |
| 694 | case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: |
| 695 | case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: |
| 696 | ret = 0; |
| 697 | break; |
| 698 | default: |
| 699 | ret = -ENXIO; |
| 700 | break; |
| 701 | } |
| 702 | break; |
| 703 | default: |
| 704 | ret = -ENXIO; |
| 705 | break; |
| 706 | } |
| 707 | |
| 708 | return ret; |
| 709 | } |
| 710 | |
| 711 | long kvm_arch_vm_ioctl(struct file *filp, |
| 712 | unsigned int ioctl, unsigned long arg) |
| 713 | { |
| 714 | struct kvm *kvm = filp->private_data; |
| 715 | void __user *argp = (void __user *)arg; |
| 716 | struct kvm_device_attr attr; |
| 717 | int r; |
| 718 | |
| 719 | switch (ioctl) { |
| 720 | case KVM_S390_INTERRUPT: { |
| 721 | struct kvm_s390_interrupt s390int; |
| 722 | |
| 723 | r = -EFAULT; |
| 724 | if (copy_from_user(&s390int, argp, sizeof(s390int))) |
| 725 | break; |
| 726 | r = kvm_s390_inject_vm(kvm, &s390int); |
| 727 | break; |
| 728 | } |
| 729 | case KVM_ENABLE_CAP: { |
| 730 | struct kvm_enable_cap cap; |
| 731 | r = -EFAULT; |
| 732 | if (copy_from_user(&cap, argp, sizeof(cap))) |
| 733 | break; |
| 734 | r = kvm_vm_ioctl_enable_cap(kvm, &cap); |
| 735 | break; |
| 736 | } |
| 737 | case KVM_CREATE_IRQCHIP: { |
| 738 | struct kvm_irq_routing_entry routing; |
| 739 | |
| 740 | r = -EINVAL; |
| 741 | if (kvm->arch.use_irqchip) { |
| 742 | /* Set up dummy routing. */ |
| 743 | memset(&routing, 0, sizeof(routing)); |
| 744 | kvm_set_irq_routing(kvm, &routing, 0, 0); |
| 745 | r = 0; |
| 746 | } |
| 747 | break; |
| 748 | } |
| 749 | case KVM_SET_DEVICE_ATTR: { |
| 750 | r = -EFAULT; |
| 751 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) |
| 752 | break; |
| 753 | r = kvm_s390_vm_set_attr(kvm, &attr); |
| 754 | break; |
| 755 | } |
| 756 | case KVM_GET_DEVICE_ATTR: { |
| 757 | r = -EFAULT; |
| 758 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) |
| 759 | break; |
| 760 | r = kvm_s390_vm_get_attr(kvm, &attr); |
| 761 | break; |
| 762 | } |
| 763 | case KVM_HAS_DEVICE_ATTR: { |
| 764 | r = -EFAULT; |
| 765 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) |
| 766 | break; |
| 767 | r = kvm_s390_vm_has_attr(kvm, &attr); |
| 768 | break; |
| 769 | } |
| 770 | default: |
| 771 | r = -ENOTTY; |
| 772 | } |
| 773 | |
| 774 | return r; |
| 775 | } |
| 776 | |
| 777 | static int kvm_s390_query_ap_config(u8 *config) |
| 778 | { |
| 779 | u32 fcn_code = 0x04000000UL; |
| 780 | u32 cc = 0; |
| 781 | |
| 782 | memset(config, 0, 128); |
| 783 | asm volatile( |
| 784 | "lgr 0,%1\n" |
| 785 | "lgr 2,%2\n" |
| 786 | ".long 0xb2af0000\n" /* PQAP(QCI) */ |
| 787 | "0: ipm %0\n" |
| 788 | "srl %0,28\n" |
| 789 | "1:\n" |
| 790 | EX_TABLE(0b, 1b) |
| 791 | : "+r" (cc) |
| 792 | : "r" (fcn_code), "r" (config) |
| 793 | : "cc", "0", "2", "memory" |
| 794 | ); |
| 795 | |
| 796 | return cc; |
| 797 | } |
| 798 | |
| 799 | static int kvm_s390_apxa_installed(void) |
| 800 | { |
| 801 | u8 config[128]; |
| 802 | int cc; |
| 803 | |
| 804 | if (test_facility(2) && test_facility(12)) { |
| 805 | cc = kvm_s390_query_ap_config(config); |
| 806 | |
| 807 | if (cc) |
| 808 | pr_err("PQAP(QCI) failed with cc=%d", cc); |
| 809 | else |
| 810 | return config[0] & 0x40; |
| 811 | } |
| 812 | |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | static void kvm_s390_set_crycb_format(struct kvm *kvm) |
| 817 | { |
| 818 | kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb; |
| 819 | |
| 820 | if (kvm_s390_apxa_installed()) |
| 821 | kvm->arch.crypto.crycbd |= CRYCB_FORMAT2; |
| 822 | else |
| 823 | kvm->arch.crypto.crycbd |= CRYCB_FORMAT1; |
| 824 | } |
| 825 | |
| 826 | static void kvm_s390_get_cpu_id(struct cpuid *cpu_id) |
| 827 | { |
| 828 | get_cpu_id(cpu_id); |
| 829 | cpu_id->version = 0xff; |
| 830 | } |
| 831 | |
| 832 | static int kvm_s390_crypto_init(struct kvm *kvm) |
| 833 | { |
| 834 | if (!test_kvm_facility(kvm, 76)) |
| 835 | return 0; |
| 836 | |
| 837 | kvm->arch.crypto.crycb = kzalloc(sizeof(*kvm->arch.crypto.crycb), |
| 838 | GFP_KERNEL | GFP_DMA); |
| 839 | if (!kvm->arch.crypto.crycb) |
| 840 | return -ENOMEM; |
| 841 | |
| 842 | kvm_s390_set_crycb_format(kvm); |
| 843 | |
| 844 | /* Enable AES/DEA protected key functions by default */ |
| 845 | kvm->arch.crypto.aes_kw = 1; |
| 846 | kvm->arch.crypto.dea_kw = 1; |
| 847 | get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask, |
| 848 | sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); |
| 849 | get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask, |
| 850 | sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); |
| 851 | |
| 852 | return 0; |
| 853 | } |
| 854 | |
| 855 | int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) |
| 856 | { |
| 857 | int i, rc; |
| 858 | char debug_name[16]; |
| 859 | static unsigned long sca_offset; |
| 860 | |
| 861 | rc = -EINVAL; |
| 862 | #ifdef CONFIG_KVM_S390_UCONTROL |
| 863 | if (type & ~KVM_VM_S390_UCONTROL) |
| 864 | goto out_err; |
| 865 | if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) |
| 866 | goto out_err; |
| 867 | #else |
| 868 | if (type) |
| 869 | goto out_err; |
| 870 | #endif |
| 871 | |
| 872 | rc = s390_enable_sie(); |
| 873 | if (rc) |
| 874 | goto out_err; |
| 875 | |
| 876 | rc = -ENOMEM; |
| 877 | |
| 878 | kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL); |
| 879 | if (!kvm->arch.sca) |
| 880 | goto out_err; |
| 881 | spin_lock(&kvm_lock); |
| 882 | sca_offset = (sca_offset + 16) & 0x7f0; |
| 883 | kvm->arch.sca = (struct sca_block *) ((char *) kvm->arch.sca + sca_offset); |
| 884 | spin_unlock(&kvm_lock); |
| 885 | |
| 886 | sprintf(debug_name, "kvm-%u", current->pid); |
| 887 | |
| 888 | kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long)); |
| 889 | if (!kvm->arch.dbf) |
| 890 | goto out_nodbf; |
| 891 | |
| 892 | /* |
| 893 | * The architectural maximum amount of facilities is 16 kbit. To store |
| 894 | * this amount, 2 kbyte of memory is required. Thus we need a full |
| 895 | * page to hold the guest facility list (arch.model.fac->list) and the |
| 896 | * facility mask (arch.model.fac->mask). Its address size has to be |
| 897 | * 31 bits and word aligned. |
| 898 | */ |
| 899 | kvm->arch.model.fac = |
| 900 | (struct kvm_s390_fac *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 901 | if (!kvm->arch.model.fac) |
| 902 | goto out_nofac; |
| 903 | |
| 904 | /* Populate the facility mask initially. */ |
| 905 | memcpy(kvm->arch.model.fac->mask, S390_lowcore.stfle_fac_list, |
| 906 | S390_ARCH_FAC_LIST_SIZE_BYTE); |
| 907 | for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) { |
| 908 | if (i < kvm_s390_fac_list_mask_size()) |
| 909 | kvm->arch.model.fac->mask[i] &= kvm_s390_fac_list_mask[i]; |
| 910 | else |
| 911 | kvm->arch.model.fac->mask[i] = 0UL; |
| 912 | } |
| 913 | |
| 914 | /* Populate the facility list initially. */ |
| 915 | memcpy(kvm->arch.model.fac->list, kvm->arch.model.fac->mask, |
| 916 | S390_ARCH_FAC_LIST_SIZE_BYTE); |
| 917 | |
| 918 | kvm_s390_get_cpu_id(&kvm->arch.model.cpu_id); |
| 919 | kvm->arch.model.ibc = sclp_get_ibc() & 0x0fff; |
| 920 | |
| 921 | if (kvm_s390_crypto_init(kvm) < 0) |
| 922 | goto out_crypto; |
| 923 | |
| 924 | spin_lock_init(&kvm->arch.float_int.lock); |
| 925 | INIT_LIST_HEAD(&kvm->arch.float_int.list); |
| 926 | init_waitqueue_head(&kvm->arch.ipte_wq); |
| 927 | mutex_init(&kvm->arch.ipte_mutex); |
| 928 | |
| 929 | debug_register_view(kvm->arch.dbf, &debug_sprintf_view); |
| 930 | VM_EVENT(kvm, 3, "%s", "vm created"); |
| 931 | |
| 932 | if (type & KVM_VM_S390_UCONTROL) { |
| 933 | kvm->arch.gmap = NULL; |
| 934 | } else { |
| 935 | kvm->arch.gmap = gmap_alloc(current->mm, (1UL << 44) - 1); |
| 936 | if (!kvm->arch.gmap) |
| 937 | goto out_nogmap; |
| 938 | kvm->arch.gmap->private = kvm; |
| 939 | kvm->arch.gmap->pfault_enabled = 0; |
| 940 | } |
| 941 | |
| 942 | kvm->arch.css_support = 0; |
| 943 | kvm->arch.use_irqchip = 0; |
| 944 | kvm->arch.epoch = 0; |
| 945 | |
| 946 | spin_lock_init(&kvm->arch.start_stop_lock); |
| 947 | |
| 948 | return 0; |
| 949 | out_nogmap: |
| 950 | kfree(kvm->arch.crypto.crycb); |
| 951 | out_crypto: |
| 952 | free_page((unsigned long)kvm->arch.model.fac); |
| 953 | out_nofac: |
| 954 | debug_unregister(kvm->arch.dbf); |
| 955 | out_nodbf: |
| 956 | free_page((unsigned long)(kvm->arch.sca)); |
| 957 | out_err: |
| 958 | return rc; |
| 959 | } |
| 960 | |
| 961 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) |
| 962 | { |
| 963 | VCPU_EVENT(vcpu, 3, "%s", "free cpu"); |
| 964 | trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); |
| 965 | kvm_s390_clear_local_irqs(vcpu); |
| 966 | kvm_clear_async_pf_completion_queue(vcpu); |
| 967 | if (!kvm_is_ucontrol(vcpu->kvm)) { |
| 968 | clear_bit(63 - vcpu->vcpu_id, |
| 969 | (unsigned long *) &vcpu->kvm->arch.sca->mcn); |
| 970 | if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda == |
| 971 | (__u64) vcpu->arch.sie_block) |
| 972 | vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0; |
| 973 | } |
| 974 | smp_mb(); |
| 975 | |
| 976 | if (kvm_is_ucontrol(vcpu->kvm)) |
| 977 | gmap_free(vcpu->arch.gmap); |
| 978 | |
| 979 | if (kvm_s390_cmma_enabled(vcpu->kvm)) |
| 980 | kvm_s390_vcpu_unsetup_cmma(vcpu); |
| 981 | free_page((unsigned long)(vcpu->arch.sie_block)); |
| 982 | |
| 983 | kvm_vcpu_uninit(vcpu); |
| 984 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
| 985 | } |
| 986 | |
| 987 | static void kvm_free_vcpus(struct kvm *kvm) |
| 988 | { |
| 989 | unsigned int i; |
| 990 | struct kvm_vcpu *vcpu; |
| 991 | |
| 992 | kvm_for_each_vcpu(i, vcpu, kvm) |
| 993 | kvm_arch_vcpu_destroy(vcpu); |
| 994 | |
| 995 | mutex_lock(&kvm->lock); |
| 996 | for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) |
| 997 | kvm->vcpus[i] = NULL; |
| 998 | |
| 999 | atomic_set(&kvm->online_vcpus, 0); |
| 1000 | mutex_unlock(&kvm->lock); |
| 1001 | } |
| 1002 | |
| 1003 | void kvm_arch_destroy_vm(struct kvm *kvm) |
| 1004 | { |
| 1005 | kvm_free_vcpus(kvm); |
| 1006 | free_page((unsigned long)kvm->arch.model.fac); |
| 1007 | free_page((unsigned long)(kvm->arch.sca)); |
| 1008 | debug_unregister(kvm->arch.dbf); |
| 1009 | kfree(kvm->arch.crypto.crycb); |
| 1010 | if (!kvm_is_ucontrol(kvm)) |
| 1011 | gmap_free(kvm->arch.gmap); |
| 1012 | kvm_s390_destroy_adapters(kvm); |
| 1013 | kvm_s390_clear_float_irqs(kvm); |
| 1014 | } |
| 1015 | |
| 1016 | /* Section: vcpu related */ |
| 1017 | static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu) |
| 1018 | { |
| 1019 | vcpu->arch.gmap = gmap_alloc(current->mm, -1UL); |
| 1020 | if (!vcpu->arch.gmap) |
| 1021 | return -ENOMEM; |
| 1022 | vcpu->arch.gmap->private = vcpu->kvm; |
| 1023 | |
| 1024 | return 0; |
| 1025 | } |
| 1026 | |
| 1027 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) |
| 1028 | { |
| 1029 | vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; |
| 1030 | kvm_clear_async_pf_completion_queue(vcpu); |
| 1031 | vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | |
| 1032 | KVM_SYNC_GPRS | |
| 1033 | KVM_SYNC_ACRS | |
| 1034 | KVM_SYNC_CRS | |
| 1035 | KVM_SYNC_ARCH0 | |
| 1036 | KVM_SYNC_PFAULT; |
| 1037 | |
| 1038 | if (kvm_is_ucontrol(vcpu->kvm)) |
| 1039 | return __kvm_ucontrol_vcpu_init(vcpu); |
| 1040 | |
| 1041 | return 0; |
| 1042 | } |
| 1043 | |
| 1044 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
| 1045 | { |
| 1046 | save_fp_ctl(&vcpu->arch.host_fpregs.fpc); |
| 1047 | save_fp_regs(vcpu->arch.host_fpregs.fprs); |
| 1048 | save_access_regs(vcpu->arch.host_acrs); |
| 1049 | restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc); |
| 1050 | restore_fp_regs(vcpu->arch.guest_fpregs.fprs); |
| 1051 | restore_access_regs(vcpu->run->s.regs.acrs); |
| 1052 | gmap_enable(vcpu->arch.gmap); |
| 1053 | atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); |
| 1054 | } |
| 1055 | |
| 1056 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) |
| 1057 | { |
| 1058 | atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); |
| 1059 | gmap_disable(vcpu->arch.gmap); |
| 1060 | save_fp_ctl(&vcpu->arch.guest_fpregs.fpc); |
| 1061 | save_fp_regs(vcpu->arch.guest_fpregs.fprs); |
| 1062 | save_access_regs(vcpu->run->s.regs.acrs); |
| 1063 | restore_fp_ctl(&vcpu->arch.host_fpregs.fpc); |
| 1064 | restore_fp_regs(vcpu->arch.host_fpregs.fprs); |
| 1065 | restore_access_regs(vcpu->arch.host_acrs); |
| 1066 | } |
| 1067 | |
| 1068 | static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) |
| 1069 | { |
| 1070 | /* this equals initial cpu reset in pop, but we don't switch to ESA */ |
| 1071 | vcpu->arch.sie_block->gpsw.mask = 0UL; |
| 1072 | vcpu->arch.sie_block->gpsw.addr = 0UL; |
| 1073 | kvm_s390_set_prefix(vcpu, 0); |
| 1074 | vcpu->arch.sie_block->cputm = 0UL; |
| 1075 | vcpu->arch.sie_block->ckc = 0UL; |
| 1076 | vcpu->arch.sie_block->todpr = 0; |
| 1077 | memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64)); |
| 1078 | vcpu->arch.sie_block->gcr[0] = 0xE0UL; |
| 1079 | vcpu->arch.sie_block->gcr[14] = 0xC2000000UL; |
| 1080 | vcpu->arch.guest_fpregs.fpc = 0; |
| 1081 | asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc)); |
| 1082 | vcpu->arch.sie_block->gbea = 1; |
| 1083 | vcpu->arch.sie_block->pp = 0; |
| 1084 | vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; |
| 1085 | kvm_clear_async_pf_completion_queue(vcpu); |
| 1086 | if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) |
| 1087 | kvm_s390_vcpu_stop(vcpu); |
| 1088 | kvm_s390_clear_local_irqs(vcpu); |
| 1089 | } |
| 1090 | |
| 1091 | void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) |
| 1092 | { |
| 1093 | mutex_lock(&vcpu->kvm->lock); |
| 1094 | vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; |
| 1095 | mutex_unlock(&vcpu->kvm->lock); |
| 1096 | if (!kvm_is_ucontrol(vcpu->kvm)) |
| 1097 | vcpu->arch.gmap = vcpu->kvm->arch.gmap; |
| 1098 | } |
| 1099 | |
| 1100 | static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) |
| 1101 | { |
| 1102 | if (!test_kvm_facility(vcpu->kvm, 76)) |
| 1103 | return; |
| 1104 | |
| 1105 | vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); |
| 1106 | |
| 1107 | if (vcpu->kvm->arch.crypto.aes_kw) |
| 1108 | vcpu->arch.sie_block->ecb3 |= ECB3_AES; |
| 1109 | if (vcpu->kvm->arch.crypto.dea_kw) |
| 1110 | vcpu->arch.sie_block->ecb3 |= ECB3_DEA; |
| 1111 | |
| 1112 | vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; |
| 1113 | } |
| 1114 | |
| 1115 | void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) |
| 1116 | { |
| 1117 | free_page(vcpu->arch.sie_block->cbrlo); |
| 1118 | vcpu->arch.sie_block->cbrlo = 0; |
| 1119 | } |
| 1120 | |
| 1121 | int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) |
| 1122 | { |
| 1123 | vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL); |
| 1124 | if (!vcpu->arch.sie_block->cbrlo) |
| 1125 | return -ENOMEM; |
| 1126 | |
| 1127 | vcpu->arch.sie_block->ecb2 |= 0x80; |
| 1128 | vcpu->arch.sie_block->ecb2 &= ~0x08; |
| 1129 | return 0; |
| 1130 | } |
| 1131 | |
| 1132 | int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) |
| 1133 | { |
| 1134 | int rc = 0; |
| 1135 | |
| 1136 | atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | |
| 1137 | CPUSTAT_SM | |
| 1138 | CPUSTAT_STOPPED | |
| 1139 | CPUSTAT_GED); |
| 1140 | vcpu->arch.sie_block->ecb = 6; |
| 1141 | if (test_kvm_facility(vcpu->kvm, 50) && test_kvm_facility(vcpu->kvm, 73)) |
| 1142 | vcpu->arch.sie_block->ecb |= 0x10; |
| 1143 | |
| 1144 | vcpu->arch.sie_block->ecb2 = 8; |
| 1145 | vcpu->arch.sie_block->eca = 0xC1002000U; |
| 1146 | if (sclp_has_siif()) |
| 1147 | vcpu->arch.sie_block->eca |= 1; |
| 1148 | if (sclp_has_sigpif()) |
| 1149 | vcpu->arch.sie_block->eca |= 0x10000000U; |
| 1150 | vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE | |
| 1151 | ICTL_TPROT; |
| 1152 | |
| 1153 | if (kvm_s390_cmma_enabled(vcpu->kvm)) { |
| 1154 | rc = kvm_s390_vcpu_setup_cmma(vcpu); |
| 1155 | if (rc) |
| 1156 | return rc; |
| 1157 | } |
| 1158 | hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 1159 | vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup; |
| 1160 | |
| 1161 | mutex_lock(&vcpu->kvm->lock); |
| 1162 | vcpu->arch.cpu_id = vcpu->kvm->arch.model.cpu_id; |
| 1163 | vcpu->arch.sie_block->ibc = vcpu->kvm->arch.model.ibc; |
| 1164 | mutex_unlock(&vcpu->kvm->lock); |
| 1165 | |
| 1166 | kvm_s390_vcpu_crypto_setup(vcpu); |
| 1167 | |
| 1168 | return rc; |
| 1169 | } |
| 1170 | |
| 1171 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, |
| 1172 | unsigned int id) |
| 1173 | { |
| 1174 | struct kvm_vcpu *vcpu; |
| 1175 | struct sie_page *sie_page; |
| 1176 | int rc = -EINVAL; |
| 1177 | |
| 1178 | if (id >= KVM_MAX_VCPUS) |
| 1179 | goto out; |
| 1180 | |
| 1181 | rc = -ENOMEM; |
| 1182 | |
| 1183 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); |
| 1184 | if (!vcpu) |
| 1185 | goto out; |
| 1186 | |
| 1187 | sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL); |
| 1188 | if (!sie_page) |
| 1189 | goto out_free_cpu; |
| 1190 | |
| 1191 | vcpu->arch.sie_block = &sie_page->sie_block; |
| 1192 | vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb; |
| 1193 | |
| 1194 | vcpu->arch.sie_block->icpua = id; |
| 1195 | if (!kvm_is_ucontrol(kvm)) { |
| 1196 | if (!kvm->arch.sca) { |
| 1197 | WARN_ON_ONCE(1); |
| 1198 | goto out_free_cpu; |
| 1199 | } |
| 1200 | if (!kvm->arch.sca->cpu[id].sda) |
| 1201 | kvm->arch.sca->cpu[id].sda = |
| 1202 | (__u64) vcpu->arch.sie_block; |
| 1203 | vcpu->arch.sie_block->scaoh = |
| 1204 | (__u32)(((__u64)kvm->arch.sca) >> 32); |
| 1205 | vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca; |
| 1206 | set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn); |
| 1207 | } |
| 1208 | vcpu->arch.sie_block->fac = (int) (long) kvm->arch.model.fac->list; |
| 1209 | |
| 1210 | spin_lock_init(&vcpu->arch.local_int.lock); |
| 1211 | vcpu->arch.local_int.float_int = &kvm->arch.float_int; |
| 1212 | vcpu->arch.local_int.wq = &vcpu->wq; |
| 1213 | vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags; |
| 1214 | |
| 1215 | rc = kvm_vcpu_init(vcpu, kvm, id); |
| 1216 | if (rc) |
| 1217 | goto out_free_sie_block; |
| 1218 | VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu, |
| 1219 | vcpu->arch.sie_block); |
| 1220 | trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block); |
| 1221 | |
| 1222 | return vcpu; |
| 1223 | out_free_sie_block: |
| 1224 | free_page((unsigned long)(vcpu->arch.sie_block)); |
| 1225 | out_free_cpu: |
| 1226 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
| 1227 | out: |
| 1228 | return ERR_PTR(rc); |
| 1229 | } |
| 1230 | |
| 1231 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) |
| 1232 | { |
| 1233 | return kvm_s390_vcpu_has_irq(vcpu, 0); |
| 1234 | } |
| 1235 | |
| 1236 | void s390_vcpu_block(struct kvm_vcpu *vcpu) |
| 1237 | { |
| 1238 | atomic_set_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); |
| 1239 | } |
| 1240 | |
| 1241 | void s390_vcpu_unblock(struct kvm_vcpu *vcpu) |
| 1242 | { |
| 1243 | atomic_clear_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); |
| 1244 | } |
| 1245 | |
| 1246 | /* |
| 1247 | * Kick a guest cpu out of SIE and wait until SIE is not running. |
| 1248 | * If the CPU is not running (e.g. waiting as idle) the function will |
| 1249 | * return immediately. */ |
| 1250 | void exit_sie(struct kvm_vcpu *vcpu) |
| 1251 | { |
| 1252 | atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags); |
| 1253 | while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) |
| 1254 | cpu_relax(); |
| 1255 | } |
| 1256 | |
| 1257 | /* Kick a guest cpu out of SIE and prevent SIE-reentry */ |
| 1258 | void exit_sie_sync(struct kvm_vcpu *vcpu) |
| 1259 | { |
| 1260 | s390_vcpu_block(vcpu); |
| 1261 | exit_sie(vcpu); |
| 1262 | } |
| 1263 | |
| 1264 | static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address) |
| 1265 | { |
| 1266 | int i; |
| 1267 | struct kvm *kvm = gmap->private; |
| 1268 | struct kvm_vcpu *vcpu; |
| 1269 | |
| 1270 | kvm_for_each_vcpu(i, vcpu, kvm) { |
| 1271 | /* match against both prefix pages */ |
| 1272 | if (kvm_s390_get_prefix(vcpu) == (address & ~0x1000UL)) { |
| 1273 | VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address); |
| 1274 | kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu); |
| 1275 | exit_sie_sync(vcpu); |
| 1276 | } |
| 1277 | } |
| 1278 | } |
| 1279 | |
| 1280 | int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) |
| 1281 | { |
| 1282 | /* kvm common code refers to this, but never calls it */ |
| 1283 | BUG(); |
| 1284 | return 0; |
| 1285 | } |
| 1286 | |
| 1287 | static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, |
| 1288 | struct kvm_one_reg *reg) |
| 1289 | { |
| 1290 | int r = -EINVAL; |
| 1291 | |
| 1292 | switch (reg->id) { |
| 1293 | case KVM_REG_S390_TODPR: |
| 1294 | r = put_user(vcpu->arch.sie_block->todpr, |
| 1295 | (u32 __user *)reg->addr); |
| 1296 | break; |
| 1297 | case KVM_REG_S390_EPOCHDIFF: |
| 1298 | r = put_user(vcpu->arch.sie_block->epoch, |
| 1299 | (u64 __user *)reg->addr); |
| 1300 | break; |
| 1301 | case KVM_REG_S390_CPU_TIMER: |
| 1302 | r = put_user(vcpu->arch.sie_block->cputm, |
| 1303 | (u64 __user *)reg->addr); |
| 1304 | break; |
| 1305 | case KVM_REG_S390_CLOCK_COMP: |
| 1306 | r = put_user(vcpu->arch.sie_block->ckc, |
| 1307 | (u64 __user *)reg->addr); |
| 1308 | break; |
| 1309 | case KVM_REG_S390_PFTOKEN: |
| 1310 | r = put_user(vcpu->arch.pfault_token, |
| 1311 | (u64 __user *)reg->addr); |
| 1312 | break; |
| 1313 | case KVM_REG_S390_PFCOMPARE: |
| 1314 | r = put_user(vcpu->arch.pfault_compare, |
| 1315 | (u64 __user *)reg->addr); |
| 1316 | break; |
| 1317 | case KVM_REG_S390_PFSELECT: |
| 1318 | r = put_user(vcpu->arch.pfault_select, |
| 1319 | (u64 __user *)reg->addr); |
| 1320 | break; |
| 1321 | case KVM_REG_S390_PP: |
| 1322 | r = put_user(vcpu->arch.sie_block->pp, |
| 1323 | (u64 __user *)reg->addr); |
| 1324 | break; |
| 1325 | case KVM_REG_S390_GBEA: |
| 1326 | r = put_user(vcpu->arch.sie_block->gbea, |
| 1327 | (u64 __user *)reg->addr); |
| 1328 | break; |
| 1329 | default: |
| 1330 | break; |
| 1331 | } |
| 1332 | |
| 1333 | return r; |
| 1334 | } |
| 1335 | |
| 1336 | static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, |
| 1337 | struct kvm_one_reg *reg) |
| 1338 | { |
| 1339 | int r = -EINVAL; |
| 1340 | |
| 1341 | switch (reg->id) { |
| 1342 | case KVM_REG_S390_TODPR: |
| 1343 | r = get_user(vcpu->arch.sie_block->todpr, |
| 1344 | (u32 __user *)reg->addr); |
| 1345 | break; |
| 1346 | case KVM_REG_S390_EPOCHDIFF: |
| 1347 | r = get_user(vcpu->arch.sie_block->epoch, |
| 1348 | (u64 __user *)reg->addr); |
| 1349 | break; |
| 1350 | case KVM_REG_S390_CPU_TIMER: |
| 1351 | r = get_user(vcpu->arch.sie_block->cputm, |
| 1352 | (u64 __user *)reg->addr); |
| 1353 | break; |
| 1354 | case KVM_REG_S390_CLOCK_COMP: |
| 1355 | r = get_user(vcpu->arch.sie_block->ckc, |
| 1356 | (u64 __user *)reg->addr); |
| 1357 | break; |
| 1358 | case KVM_REG_S390_PFTOKEN: |
| 1359 | r = get_user(vcpu->arch.pfault_token, |
| 1360 | (u64 __user *)reg->addr); |
| 1361 | if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) |
| 1362 | kvm_clear_async_pf_completion_queue(vcpu); |
| 1363 | break; |
| 1364 | case KVM_REG_S390_PFCOMPARE: |
| 1365 | r = get_user(vcpu->arch.pfault_compare, |
| 1366 | (u64 __user *)reg->addr); |
| 1367 | break; |
| 1368 | case KVM_REG_S390_PFSELECT: |
| 1369 | r = get_user(vcpu->arch.pfault_select, |
| 1370 | (u64 __user *)reg->addr); |
| 1371 | break; |
| 1372 | case KVM_REG_S390_PP: |
| 1373 | r = get_user(vcpu->arch.sie_block->pp, |
| 1374 | (u64 __user *)reg->addr); |
| 1375 | break; |
| 1376 | case KVM_REG_S390_GBEA: |
| 1377 | r = get_user(vcpu->arch.sie_block->gbea, |
| 1378 | (u64 __user *)reg->addr); |
| 1379 | break; |
| 1380 | default: |
| 1381 | break; |
| 1382 | } |
| 1383 | |
| 1384 | return r; |
| 1385 | } |
| 1386 | |
| 1387 | static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) |
| 1388 | { |
| 1389 | kvm_s390_vcpu_initial_reset(vcpu); |
| 1390 | return 0; |
| 1391 | } |
| 1392 | |
| 1393 | int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) |
| 1394 | { |
| 1395 | memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); |
| 1396 | return 0; |
| 1397 | } |
| 1398 | |
| 1399 | int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) |
| 1400 | { |
| 1401 | memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); |
| 1402 | return 0; |
| 1403 | } |
| 1404 | |
| 1405 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, |
| 1406 | struct kvm_sregs *sregs) |
| 1407 | { |
| 1408 | memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); |
| 1409 | memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); |
| 1410 | restore_access_regs(vcpu->run->s.regs.acrs); |
| 1411 | return 0; |
| 1412 | } |
| 1413 | |
| 1414 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, |
| 1415 | struct kvm_sregs *sregs) |
| 1416 | { |
| 1417 | memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); |
| 1418 | memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); |
| 1419 | return 0; |
| 1420 | } |
| 1421 | |
| 1422 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) |
| 1423 | { |
| 1424 | if (test_fp_ctl(fpu->fpc)) |
| 1425 | return -EINVAL; |
| 1426 | memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs)); |
| 1427 | vcpu->arch.guest_fpregs.fpc = fpu->fpc; |
| 1428 | restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc); |
| 1429 | restore_fp_regs(vcpu->arch.guest_fpregs.fprs); |
| 1430 | return 0; |
| 1431 | } |
| 1432 | |
| 1433 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) |
| 1434 | { |
| 1435 | memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs)); |
| 1436 | fpu->fpc = vcpu->arch.guest_fpregs.fpc; |
| 1437 | return 0; |
| 1438 | } |
| 1439 | |
| 1440 | static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) |
| 1441 | { |
| 1442 | int rc = 0; |
| 1443 | |
| 1444 | if (!is_vcpu_stopped(vcpu)) |
| 1445 | rc = -EBUSY; |
| 1446 | else { |
| 1447 | vcpu->run->psw_mask = psw.mask; |
| 1448 | vcpu->run->psw_addr = psw.addr; |
| 1449 | } |
| 1450 | return rc; |
| 1451 | } |
| 1452 | |
| 1453 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, |
| 1454 | struct kvm_translation *tr) |
| 1455 | { |
| 1456 | return -EINVAL; /* not implemented yet */ |
| 1457 | } |
| 1458 | |
| 1459 | #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ |
| 1460 | KVM_GUESTDBG_USE_HW_BP | \ |
| 1461 | KVM_GUESTDBG_ENABLE) |
| 1462 | |
| 1463 | int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, |
| 1464 | struct kvm_guest_debug *dbg) |
| 1465 | { |
| 1466 | int rc = 0; |
| 1467 | |
| 1468 | vcpu->guest_debug = 0; |
| 1469 | kvm_s390_clear_bp_data(vcpu); |
| 1470 | |
| 1471 | if (dbg->control & ~VALID_GUESTDBG_FLAGS) |
| 1472 | return -EINVAL; |
| 1473 | |
| 1474 | if (dbg->control & KVM_GUESTDBG_ENABLE) { |
| 1475 | vcpu->guest_debug = dbg->control; |
| 1476 | /* enforce guest PER */ |
| 1477 | atomic_set_mask(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); |
| 1478 | |
| 1479 | if (dbg->control & KVM_GUESTDBG_USE_HW_BP) |
| 1480 | rc = kvm_s390_import_bp_data(vcpu, dbg); |
| 1481 | } else { |
| 1482 | atomic_clear_mask(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); |
| 1483 | vcpu->arch.guestdbg.last_bp = 0; |
| 1484 | } |
| 1485 | |
| 1486 | if (rc) { |
| 1487 | vcpu->guest_debug = 0; |
| 1488 | kvm_s390_clear_bp_data(vcpu); |
| 1489 | atomic_clear_mask(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); |
| 1490 | } |
| 1491 | |
| 1492 | return rc; |
| 1493 | } |
| 1494 | |
| 1495 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, |
| 1496 | struct kvm_mp_state *mp_state) |
| 1497 | { |
| 1498 | /* CHECK_STOP and LOAD are not supported yet */ |
| 1499 | return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED : |
| 1500 | KVM_MP_STATE_OPERATING; |
| 1501 | } |
| 1502 | |
| 1503 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, |
| 1504 | struct kvm_mp_state *mp_state) |
| 1505 | { |
| 1506 | int rc = 0; |
| 1507 | |
| 1508 | /* user space knows about this interface - let it control the state */ |
| 1509 | vcpu->kvm->arch.user_cpu_state_ctrl = 1; |
| 1510 | |
| 1511 | switch (mp_state->mp_state) { |
| 1512 | case KVM_MP_STATE_STOPPED: |
| 1513 | kvm_s390_vcpu_stop(vcpu); |
| 1514 | break; |
| 1515 | case KVM_MP_STATE_OPERATING: |
| 1516 | kvm_s390_vcpu_start(vcpu); |
| 1517 | break; |
| 1518 | case KVM_MP_STATE_LOAD: |
| 1519 | case KVM_MP_STATE_CHECK_STOP: |
| 1520 | /* fall through - CHECK_STOP and LOAD are not supported yet */ |
| 1521 | default: |
| 1522 | rc = -ENXIO; |
| 1523 | } |
| 1524 | |
| 1525 | return rc; |
| 1526 | } |
| 1527 | |
| 1528 | bool kvm_s390_cmma_enabled(struct kvm *kvm) |
| 1529 | { |
| 1530 | if (!MACHINE_IS_LPAR) |
| 1531 | return false; |
| 1532 | /* only enable for z10 and later */ |
| 1533 | if (!MACHINE_HAS_EDAT1) |
| 1534 | return false; |
| 1535 | if (!kvm->arch.use_cmma) |
| 1536 | return false; |
| 1537 | return true; |
| 1538 | } |
| 1539 | |
| 1540 | static bool ibs_enabled(struct kvm_vcpu *vcpu) |
| 1541 | { |
| 1542 | return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS; |
| 1543 | } |
| 1544 | |
| 1545 | static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) |
| 1546 | { |
| 1547 | retry: |
| 1548 | s390_vcpu_unblock(vcpu); |
| 1549 | /* |
| 1550 | * We use MMU_RELOAD just to re-arm the ipte notifier for the |
| 1551 | * guest prefix page. gmap_ipte_notify will wait on the ptl lock. |
| 1552 | * This ensures that the ipte instruction for this request has |
| 1553 | * already finished. We might race against a second unmapper that |
| 1554 | * wants to set the blocking bit. Lets just retry the request loop. |
| 1555 | */ |
| 1556 | if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) { |
| 1557 | int rc; |
| 1558 | rc = gmap_ipte_notify(vcpu->arch.gmap, |
| 1559 | kvm_s390_get_prefix(vcpu), |
| 1560 | PAGE_SIZE * 2); |
| 1561 | if (rc) |
| 1562 | return rc; |
| 1563 | goto retry; |
| 1564 | } |
| 1565 | |
| 1566 | if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { |
| 1567 | vcpu->arch.sie_block->ihcpu = 0xffff; |
| 1568 | goto retry; |
| 1569 | } |
| 1570 | |
| 1571 | if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { |
| 1572 | if (!ibs_enabled(vcpu)) { |
| 1573 | trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); |
| 1574 | atomic_set_mask(CPUSTAT_IBS, |
| 1575 | &vcpu->arch.sie_block->cpuflags); |
| 1576 | } |
| 1577 | goto retry; |
| 1578 | } |
| 1579 | |
| 1580 | if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { |
| 1581 | if (ibs_enabled(vcpu)) { |
| 1582 | trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); |
| 1583 | atomic_clear_mask(CPUSTAT_IBS, |
| 1584 | &vcpu->arch.sie_block->cpuflags); |
| 1585 | } |
| 1586 | goto retry; |
| 1587 | } |
| 1588 | |
| 1589 | /* nothing to do, just clear the request */ |
| 1590 | clear_bit(KVM_REQ_UNHALT, &vcpu->requests); |
| 1591 | |
| 1592 | return 0; |
| 1593 | } |
| 1594 | |
| 1595 | /** |
| 1596 | * kvm_arch_fault_in_page - fault-in guest page if necessary |
| 1597 | * @vcpu: The corresponding virtual cpu |
| 1598 | * @gpa: Guest physical address |
| 1599 | * @writable: Whether the page should be writable or not |
| 1600 | * |
| 1601 | * Make sure that a guest page has been faulted-in on the host. |
| 1602 | * |
| 1603 | * Return: Zero on success, negative error code otherwise. |
| 1604 | */ |
| 1605 | long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable) |
| 1606 | { |
| 1607 | return gmap_fault(vcpu->arch.gmap, gpa, |
| 1608 | writable ? FAULT_FLAG_WRITE : 0); |
| 1609 | } |
| 1610 | |
| 1611 | static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, |
| 1612 | unsigned long token) |
| 1613 | { |
| 1614 | struct kvm_s390_interrupt inti; |
| 1615 | struct kvm_s390_irq irq; |
| 1616 | |
| 1617 | if (start_token) { |
| 1618 | irq.u.ext.ext_params2 = token; |
| 1619 | irq.type = KVM_S390_INT_PFAULT_INIT; |
| 1620 | WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq)); |
| 1621 | } else { |
| 1622 | inti.type = KVM_S390_INT_PFAULT_DONE; |
| 1623 | inti.parm64 = token; |
| 1624 | WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti)); |
| 1625 | } |
| 1626 | } |
| 1627 | |
| 1628 | void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, |
| 1629 | struct kvm_async_pf *work) |
| 1630 | { |
| 1631 | trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); |
| 1632 | __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); |
| 1633 | } |
| 1634 | |
| 1635 | void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, |
| 1636 | struct kvm_async_pf *work) |
| 1637 | { |
| 1638 | trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); |
| 1639 | __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); |
| 1640 | } |
| 1641 | |
| 1642 | void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, |
| 1643 | struct kvm_async_pf *work) |
| 1644 | { |
| 1645 | /* s390 will always inject the page directly */ |
| 1646 | } |
| 1647 | |
| 1648 | bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) |
| 1649 | { |
| 1650 | /* |
| 1651 | * s390 will always inject the page directly, |
| 1652 | * but we still want check_async_completion to cleanup |
| 1653 | */ |
| 1654 | return true; |
| 1655 | } |
| 1656 | |
| 1657 | static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) |
| 1658 | { |
| 1659 | hva_t hva; |
| 1660 | struct kvm_arch_async_pf arch; |
| 1661 | int rc; |
| 1662 | |
| 1663 | if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) |
| 1664 | return 0; |
| 1665 | if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != |
| 1666 | vcpu->arch.pfault_compare) |
| 1667 | return 0; |
| 1668 | if (psw_extint_disabled(vcpu)) |
| 1669 | return 0; |
| 1670 | if (kvm_s390_vcpu_has_irq(vcpu, 0)) |
| 1671 | return 0; |
| 1672 | if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul)) |
| 1673 | return 0; |
| 1674 | if (!vcpu->arch.gmap->pfault_enabled) |
| 1675 | return 0; |
| 1676 | |
| 1677 | hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr)); |
| 1678 | hva += current->thread.gmap_addr & ~PAGE_MASK; |
| 1679 | if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) |
| 1680 | return 0; |
| 1681 | |
| 1682 | rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch); |
| 1683 | return rc; |
| 1684 | } |
| 1685 | |
| 1686 | static int vcpu_pre_run(struct kvm_vcpu *vcpu) |
| 1687 | { |
| 1688 | int rc, cpuflags; |
| 1689 | |
| 1690 | /* |
| 1691 | * On s390 notifications for arriving pages will be delivered directly |
| 1692 | * to the guest but the house keeping for completed pfaults is |
| 1693 | * handled outside the worker. |
| 1694 | */ |
| 1695 | kvm_check_async_pf_completion(vcpu); |
| 1696 | |
| 1697 | memcpy(&vcpu->arch.sie_block->gg14, &vcpu->run->s.regs.gprs[14], 16); |
| 1698 | |
| 1699 | if (need_resched()) |
| 1700 | schedule(); |
| 1701 | |
| 1702 | if (test_cpu_flag(CIF_MCCK_PENDING)) |
| 1703 | s390_handle_mcck(); |
| 1704 | |
| 1705 | if (!kvm_is_ucontrol(vcpu->kvm)) { |
| 1706 | rc = kvm_s390_deliver_pending_interrupts(vcpu); |
| 1707 | if (rc) |
| 1708 | return rc; |
| 1709 | } |
| 1710 | |
| 1711 | rc = kvm_s390_handle_requests(vcpu); |
| 1712 | if (rc) |
| 1713 | return rc; |
| 1714 | |
| 1715 | if (guestdbg_enabled(vcpu)) { |
| 1716 | kvm_s390_backup_guest_per_regs(vcpu); |
| 1717 | kvm_s390_patch_guest_per_regs(vcpu); |
| 1718 | } |
| 1719 | |
| 1720 | vcpu->arch.sie_block->icptcode = 0; |
| 1721 | cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); |
| 1722 | VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); |
| 1723 | trace_kvm_s390_sie_enter(vcpu, cpuflags); |
| 1724 | |
| 1725 | return 0; |
| 1726 | } |
| 1727 | |
| 1728 | static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) |
| 1729 | { |
| 1730 | int rc = -1; |
| 1731 | |
| 1732 | VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", |
| 1733 | vcpu->arch.sie_block->icptcode); |
| 1734 | trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); |
| 1735 | |
| 1736 | if (guestdbg_enabled(vcpu)) |
| 1737 | kvm_s390_restore_guest_per_regs(vcpu); |
| 1738 | |
| 1739 | if (exit_reason >= 0) { |
| 1740 | rc = 0; |
| 1741 | } else if (kvm_is_ucontrol(vcpu->kvm)) { |
| 1742 | vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; |
| 1743 | vcpu->run->s390_ucontrol.trans_exc_code = |
| 1744 | current->thread.gmap_addr; |
| 1745 | vcpu->run->s390_ucontrol.pgm_code = 0x10; |
| 1746 | rc = -EREMOTE; |
| 1747 | |
| 1748 | } else if (current->thread.gmap_pfault) { |
| 1749 | trace_kvm_s390_major_guest_pfault(vcpu); |
| 1750 | current->thread.gmap_pfault = 0; |
| 1751 | if (kvm_arch_setup_async_pf(vcpu)) { |
| 1752 | rc = 0; |
| 1753 | } else { |
| 1754 | gpa_t gpa = current->thread.gmap_addr; |
| 1755 | rc = kvm_arch_fault_in_page(vcpu, gpa, 1); |
| 1756 | } |
| 1757 | } |
| 1758 | |
| 1759 | if (rc == -1) { |
| 1760 | VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); |
| 1761 | trace_kvm_s390_sie_fault(vcpu); |
| 1762 | rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| 1763 | } |
| 1764 | |
| 1765 | memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16); |
| 1766 | |
| 1767 | if (rc == 0) { |
| 1768 | if (kvm_is_ucontrol(vcpu->kvm)) |
| 1769 | /* Don't exit for host interrupts. */ |
| 1770 | rc = vcpu->arch.sie_block->icptcode ? -EOPNOTSUPP : 0; |
| 1771 | else |
| 1772 | rc = kvm_handle_sie_intercept(vcpu); |
| 1773 | } |
| 1774 | |
| 1775 | return rc; |
| 1776 | } |
| 1777 | |
| 1778 | static int __vcpu_run(struct kvm_vcpu *vcpu) |
| 1779 | { |
| 1780 | int rc, exit_reason; |
| 1781 | |
| 1782 | /* |
| 1783 | * We try to hold kvm->srcu during most of vcpu_run (except when run- |
| 1784 | * ning the guest), so that memslots (and other stuff) are protected |
| 1785 | */ |
| 1786 | vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
| 1787 | |
| 1788 | do { |
| 1789 | rc = vcpu_pre_run(vcpu); |
| 1790 | if (rc) |
| 1791 | break; |
| 1792 | |
| 1793 | srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); |
| 1794 | /* |
| 1795 | * As PF_VCPU will be used in fault handler, between |
| 1796 | * guest_enter and guest_exit should be no uaccess. |
| 1797 | */ |
| 1798 | preempt_disable(); |
| 1799 | kvm_guest_enter(); |
| 1800 | preempt_enable(); |
| 1801 | exit_reason = sie64a(vcpu->arch.sie_block, |
| 1802 | vcpu->run->s.regs.gprs); |
| 1803 | kvm_guest_exit(); |
| 1804 | vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
| 1805 | |
| 1806 | rc = vcpu_post_run(vcpu, exit_reason); |
| 1807 | } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc); |
| 1808 | |
| 1809 | srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); |
| 1810 | return rc; |
| 1811 | } |
| 1812 | |
| 1813 | static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1814 | { |
| 1815 | vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; |
| 1816 | vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; |
| 1817 | if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) |
| 1818 | kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); |
| 1819 | if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { |
| 1820 | memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); |
| 1821 | /* some control register changes require a tlb flush */ |
| 1822 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
| 1823 | } |
| 1824 | if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { |
| 1825 | vcpu->arch.sie_block->cputm = kvm_run->s.regs.cputm; |
| 1826 | vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc; |
| 1827 | vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr; |
| 1828 | vcpu->arch.sie_block->pp = kvm_run->s.regs.pp; |
| 1829 | vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea; |
| 1830 | } |
| 1831 | if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) { |
| 1832 | vcpu->arch.pfault_token = kvm_run->s.regs.pft; |
| 1833 | vcpu->arch.pfault_select = kvm_run->s.regs.pfs; |
| 1834 | vcpu->arch.pfault_compare = kvm_run->s.regs.pfc; |
| 1835 | if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) |
| 1836 | kvm_clear_async_pf_completion_queue(vcpu); |
| 1837 | } |
| 1838 | kvm_run->kvm_dirty_regs = 0; |
| 1839 | } |
| 1840 | |
| 1841 | static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1842 | { |
| 1843 | kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; |
| 1844 | kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; |
| 1845 | kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu); |
| 1846 | memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); |
| 1847 | kvm_run->s.regs.cputm = vcpu->arch.sie_block->cputm; |
| 1848 | kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc; |
| 1849 | kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr; |
| 1850 | kvm_run->s.regs.pp = vcpu->arch.sie_block->pp; |
| 1851 | kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea; |
| 1852 | kvm_run->s.regs.pft = vcpu->arch.pfault_token; |
| 1853 | kvm_run->s.regs.pfs = vcpu->arch.pfault_select; |
| 1854 | kvm_run->s.regs.pfc = vcpu->arch.pfault_compare; |
| 1855 | } |
| 1856 | |
| 1857 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1858 | { |
| 1859 | int rc; |
| 1860 | sigset_t sigsaved; |
| 1861 | |
| 1862 | if (guestdbg_exit_pending(vcpu)) { |
| 1863 | kvm_s390_prepare_debug_exit(vcpu); |
| 1864 | return 0; |
| 1865 | } |
| 1866 | |
| 1867 | if (vcpu->sigset_active) |
| 1868 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); |
| 1869 | |
| 1870 | if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) { |
| 1871 | kvm_s390_vcpu_start(vcpu); |
| 1872 | } else if (is_vcpu_stopped(vcpu)) { |
| 1873 | pr_err_ratelimited("kvm-s390: can't run stopped vcpu %d\n", |
| 1874 | vcpu->vcpu_id); |
| 1875 | return -EINVAL; |
| 1876 | } |
| 1877 | |
| 1878 | sync_regs(vcpu, kvm_run); |
| 1879 | |
| 1880 | might_fault(); |
| 1881 | rc = __vcpu_run(vcpu); |
| 1882 | |
| 1883 | if (signal_pending(current) && !rc) { |
| 1884 | kvm_run->exit_reason = KVM_EXIT_INTR; |
| 1885 | rc = -EINTR; |
| 1886 | } |
| 1887 | |
| 1888 | if (guestdbg_exit_pending(vcpu) && !rc) { |
| 1889 | kvm_s390_prepare_debug_exit(vcpu); |
| 1890 | rc = 0; |
| 1891 | } |
| 1892 | |
| 1893 | if (rc == -EOPNOTSUPP) { |
| 1894 | /* intercept cannot be handled in-kernel, prepare kvm-run */ |
| 1895 | kvm_run->exit_reason = KVM_EXIT_S390_SIEIC; |
| 1896 | kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; |
| 1897 | kvm_run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; |
| 1898 | kvm_run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; |
| 1899 | rc = 0; |
| 1900 | } |
| 1901 | |
| 1902 | if (rc == -EREMOTE) { |
| 1903 | /* intercept was handled, but userspace support is needed |
| 1904 | * kvm_run has been prepared by the handler */ |
| 1905 | rc = 0; |
| 1906 | } |
| 1907 | |
| 1908 | store_regs(vcpu, kvm_run); |
| 1909 | |
| 1910 | if (vcpu->sigset_active) |
| 1911 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
| 1912 | |
| 1913 | vcpu->stat.exit_userspace++; |
| 1914 | return rc; |
| 1915 | } |
| 1916 | |
| 1917 | /* |
| 1918 | * store status at address |
| 1919 | * we use have two special cases: |
| 1920 | * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit |
| 1921 | * KVM_S390_STORE_STATUS_PREFIXED: -> prefix |
| 1922 | */ |
| 1923 | int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) |
| 1924 | { |
| 1925 | unsigned char archmode = 1; |
| 1926 | unsigned int px; |
| 1927 | u64 clkcomp; |
| 1928 | int rc; |
| 1929 | |
| 1930 | if (gpa == KVM_S390_STORE_STATUS_NOADDR) { |
| 1931 | if (write_guest_abs(vcpu, 163, &archmode, 1)) |
| 1932 | return -EFAULT; |
| 1933 | gpa = SAVE_AREA_BASE; |
| 1934 | } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { |
| 1935 | if (write_guest_real(vcpu, 163, &archmode, 1)) |
| 1936 | return -EFAULT; |
| 1937 | gpa = kvm_s390_real_to_abs(vcpu, SAVE_AREA_BASE); |
| 1938 | } |
| 1939 | rc = write_guest_abs(vcpu, gpa + offsetof(struct save_area, fp_regs), |
| 1940 | vcpu->arch.guest_fpregs.fprs, 128); |
| 1941 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, gp_regs), |
| 1942 | vcpu->run->s.regs.gprs, 128); |
| 1943 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, psw), |
| 1944 | &vcpu->arch.sie_block->gpsw, 16); |
| 1945 | px = kvm_s390_get_prefix(vcpu); |
| 1946 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, pref_reg), |
| 1947 | &px, 4); |
| 1948 | rc |= write_guest_abs(vcpu, |
| 1949 | gpa + offsetof(struct save_area, fp_ctrl_reg), |
| 1950 | &vcpu->arch.guest_fpregs.fpc, 4); |
| 1951 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, tod_reg), |
| 1952 | &vcpu->arch.sie_block->todpr, 4); |
| 1953 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, timer), |
| 1954 | &vcpu->arch.sie_block->cputm, 8); |
| 1955 | clkcomp = vcpu->arch.sie_block->ckc >> 8; |
| 1956 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, clk_cmp), |
| 1957 | &clkcomp, 8); |
| 1958 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, acc_regs), |
| 1959 | &vcpu->run->s.regs.acrs, 64); |
| 1960 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, ctrl_regs), |
| 1961 | &vcpu->arch.sie_block->gcr, 128); |
| 1962 | return rc ? -EFAULT : 0; |
| 1963 | } |
| 1964 | |
| 1965 | int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) |
| 1966 | { |
| 1967 | /* |
| 1968 | * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy |
| 1969 | * copying in vcpu load/put. Lets update our copies before we save |
| 1970 | * it into the save area |
| 1971 | */ |
| 1972 | save_fp_ctl(&vcpu->arch.guest_fpregs.fpc); |
| 1973 | save_fp_regs(vcpu->arch.guest_fpregs.fprs); |
| 1974 | save_access_regs(vcpu->run->s.regs.acrs); |
| 1975 | |
| 1976 | return kvm_s390_store_status_unloaded(vcpu, addr); |
| 1977 | } |
| 1978 | |
| 1979 | static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) |
| 1980 | { |
| 1981 | kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); |
| 1982 | kvm_make_request(KVM_REQ_DISABLE_IBS, vcpu); |
| 1983 | exit_sie_sync(vcpu); |
| 1984 | } |
| 1985 | |
| 1986 | static void __disable_ibs_on_all_vcpus(struct kvm *kvm) |
| 1987 | { |
| 1988 | unsigned int i; |
| 1989 | struct kvm_vcpu *vcpu; |
| 1990 | |
| 1991 | kvm_for_each_vcpu(i, vcpu, kvm) { |
| 1992 | __disable_ibs_on_vcpu(vcpu); |
| 1993 | } |
| 1994 | } |
| 1995 | |
| 1996 | static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) |
| 1997 | { |
| 1998 | kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); |
| 1999 | kvm_make_request(KVM_REQ_ENABLE_IBS, vcpu); |
| 2000 | exit_sie_sync(vcpu); |
| 2001 | } |
| 2002 | |
| 2003 | void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) |
| 2004 | { |
| 2005 | int i, online_vcpus, started_vcpus = 0; |
| 2006 | |
| 2007 | if (!is_vcpu_stopped(vcpu)) |
| 2008 | return; |
| 2009 | |
| 2010 | trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); |
| 2011 | /* Only one cpu at a time may enter/leave the STOPPED state. */ |
| 2012 | spin_lock(&vcpu->kvm->arch.start_stop_lock); |
| 2013 | online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); |
| 2014 | |
| 2015 | for (i = 0; i < online_vcpus; i++) { |
| 2016 | if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) |
| 2017 | started_vcpus++; |
| 2018 | } |
| 2019 | |
| 2020 | if (started_vcpus == 0) { |
| 2021 | /* we're the only active VCPU -> speed it up */ |
| 2022 | __enable_ibs_on_vcpu(vcpu); |
| 2023 | } else if (started_vcpus == 1) { |
| 2024 | /* |
| 2025 | * As we are starting a second VCPU, we have to disable |
| 2026 | * the IBS facility on all VCPUs to remove potentially |
| 2027 | * oustanding ENABLE requests. |
| 2028 | */ |
| 2029 | __disable_ibs_on_all_vcpus(vcpu->kvm); |
| 2030 | } |
| 2031 | |
| 2032 | atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags); |
| 2033 | /* |
| 2034 | * Another VCPU might have used IBS while we were offline. |
| 2035 | * Let's play safe and flush the VCPU at startup. |
| 2036 | */ |
| 2037 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
| 2038 | spin_unlock(&vcpu->kvm->arch.start_stop_lock); |
| 2039 | return; |
| 2040 | } |
| 2041 | |
| 2042 | void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) |
| 2043 | { |
| 2044 | int i, online_vcpus, started_vcpus = 0; |
| 2045 | struct kvm_vcpu *started_vcpu = NULL; |
| 2046 | |
| 2047 | if (is_vcpu_stopped(vcpu)) |
| 2048 | return; |
| 2049 | |
| 2050 | trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); |
| 2051 | /* Only one cpu at a time may enter/leave the STOPPED state. */ |
| 2052 | spin_lock(&vcpu->kvm->arch.start_stop_lock); |
| 2053 | online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); |
| 2054 | |
| 2055 | /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */ |
| 2056 | kvm_s390_clear_stop_irq(vcpu); |
| 2057 | |
| 2058 | atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags); |
| 2059 | __disable_ibs_on_vcpu(vcpu); |
| 2060 | |
| 2061 | for (i = 0; i < online_vcpus; i++) { |
| 2062 | if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) { |
| 2063 | started_vcpus++; |
| 2064 | started_vcpu = vcpu->kvm->vcpus[i]; |
| 2065 | } |
| 2066 | } |
| 2067 | |
| 2068 | if (started_vcpus == 1) { |
| 2069 | /* |
| 2070 | * As we only have one VCPU left, we want to enable the |
| 2071 | * IBS facility for that VCPU to speed it up. |
| 2072 | */ |
| 2073 | __enable_ibs_on_vcpu(started_vcpu); |
| 2074 | } |
| 2075 | |
| 2076 | spin_unlock(&vcpu->kvm->arch.start_stop_lock); |
| 2077 | return; |
| 2078 | } |
| 2079 | |
| 2080 | static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, |
| 2081 | struct kvm_enable_cap *cap) |
| 2082 | { |
| 2083 | int r; |
| 2084 | |
| 2085 | if (cap->flags) |
| 2086 | return -EINVAL; |
| 2087 | |
| 2088 | switch (cap->cap) { |
| 2089 | case KVM_CAP_S390_CSS_SUPPORT: |
| 2090 | if (!vcpu->kvm->arch.css_support) { |
| 2091 | vcpu->kvm->arch.css_support = 1; |
| 2092 | trace_kvm_s390_enable_css(vcpu->kvm); |
| 2093 | } |
| 2094 | r = 0; |
| 2095 | break; |
| 2096 | default: |
| 2097 | r = -EINVAL; |
| 2098 | break; |
| 2099 | } |
| 2100 | return r; |
| 2101 | } |
| 2102 | |
| 2103 | long kvm_arch_vcpu_ioctl(struct file *filp, |
| 2104 | unsigned int ioctl, unsigned long arg) |
| 2105 | { |
| 2106 | struct kvm_vcpu *vcpu = filp->private_data; |
| 2107 | void __user *argp = (void __user *)arg; |
| 2108 | int idx; |
| 2109 | long r; |
| 2110 | |
| 2111 | switch (ioctl) { |
| 2112 | case KVM_S390_INTERRUPT: { |
| 2113 | struct kvm_s390_interrupt s390int; |
| 2114 | struct kvm_s390_irq s390irq; |
| 2115 | |
| 2116 | r = -EFAULT; |
| 2117 | if (copy_from_user(&s390int, argp, sizeof(s390int))) |
| 2118 | break; |
| 2119 | if (s390int_to_s390irq(&s390int, &s390irq)) |
| 2120 | return -EINVAL; |
| 2121 | r = kvm_s390_inject_vcpu(vcpu, &s390irq); |
| 2122 | break; |
| 2123 | } |
| 2124 | case KVM_S390_STORE_STATUS: |
| 2125 | idx = srcu_read_lock(&vcpu->kvm->srcu); |
| 2126 | r = kvm_s390_vcpu_store_status(vcpu, arg); |
| 2127 | srcu_read_unlock(&vcpu->kvm->srcu, idx); |
| 2128 | break; |
| 2129 | case KVM_S390_SET_INITIAL_PSW: { |
| 2130 | psw_t psw; |
| 2131 | |
| 2132 | r = -EFAULT; |
| 2133 | if (copy_from_user(&psw, argp, sizeof(psw))) |
| 2134 | break; |
| 2135 | r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); |
| 2136 | break; |
| 2137 | } |
| 2138 | case KVM_S390_INITIAL_RESET: |
| 2139 | r = kvm_arch_vcpu_ioctl_initial_reset(vcpu); |
| 2140 | break; |
| 2141 | case KVM_SET_ONE_REG: |
| 2142 | case KVM_GET_ONE_REG: { |
| 2143 | struct kvm_one_reg reg; |
| 2144 | r = -EFAULT; |
| 2145 | if (copy_from_user(®, argp, sizeof(reg))) |
| 2146 | break; |
| 2147 | if (ioctl == KVM_SET_ONE_REG) |
| 2148 | r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); |
| 2149 | else |
| 2150 | r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); |
| 2151 | break; |
| 2152 | } |
| 2153 | #ifdef CONFIG_KVM_S390_UCONTROL |
| 2154 | case KVM_S390_UCAS_MAP: { |
| 2155 | struct kvm_s390_ucas_mapping ucasmap; |
| 2156 | |
| 2157 | if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { |
| 2158 | r = -EFAULT; |
| 2159 | break; |
| 2160 | } |
| 2161 | |
| 2162 | if (!kvm_is_ucontrol(vcpu->kvm)) { |
| 2163 | r = -EINVAL; |
| 2164 | break; |
| 2165 | } |
| 2166 | |
| 2167 | r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr, |
| 2168 | ucasmap.vcpu_addr, ucasmap.length); |
| 2169 | break; |
| 2170 | } |
| 2171 | case KVM_S390_UCAS_UNMAP: { |
| 2172 | struct kvm_s390_ucas_mapping ucasmap; |
| 2173 | |
| 2174 | if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { |
| 2175 | r = -EFAULT; |
| 2176 | break; |
| 2177 | } |
| 2178 | |
| 2179 | if (!kvm_is_ucontrol(vcpu->kvm)) { |
| 2180 | r = -EINVAL; |
| 2181 | break; |
| 2182 | } |
| 2183 | |
| 2184 | r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr, |
| 2185 | ucasmap.length); |
| 2186 | break; |
| 2187 | } |
| 2188 | #endif |
| 2189 | case KVM_S390_VCPU_FAULT: { |
| 2190 | r = gmap_fault(vcpu->arch.gmap, arg, 0); |
| 2191 | break; |
| 2192 | } |
| 2193 | case KVM_ENABLE_CAP: |
| 2194 | { |
| 2195 | struct kvm_enable_cap cap; |
| 2196 | r = -EFAULT; |
| 2197 | if (copy_from_user(&cap, argp, sizeof(cap))) |
| 2198 | break; |
| 2199 | r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); |
| 2200 | break; |
| 2201 | } |
| 2202 | default: |
| 2203 | r = -ENOTTY; |
| 2204 | } |
| 2205 | return r; |
| 2206 | } |
| 2207 | |
| 2208 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) |
| 2209 | { |
| 2210 | #ifdef CONFIG_KVM_S390_UCONTROL |
| 2211 | if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) |
| 2212 | && (kvm_is_ucontrol(vcpu->kvm))) { |
| 2213 | vmf->page = virt_to_page(vcpu->arch.sie_block); |
| 2214 | get_page(vmf->page); |
| 2215 | return 0; |
| 2216 | } |
| 2217 | #endif |
| 2218 | return VM_FAULT_SIGBUS; |
| 2219 | } |
| 2220 | |
| 2221 | int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, |
| 2222 | unsigned long npages) |
| 2223 | { |
| 2224 | return 0; |
| 2225 | } |
| 2226 | |
| 2227 | /* Section: memory related */ |
| 2228 | int kvm_arch_prepare_memory_region(struct kvm *kvm, |
| 2229 | struct kvm_memory_slot *memslot, |
| 2230 | struct kvm_userspace_memory_region *mem, |
| 2231 | enum kvm_mr_change change) |
| 2232 | { |
| 2233 | /* A few sanity checks. We can have memory slots which have to be |
| 2234 | located/ended at a segment boundary (1MB). The memory in userland is |
| 2235 | ok to be fragmented into various different vmas. It is okay to mmap() |
| 2236 | and munmap() stuff in this slot after doing this call at any time */ |
| 2237 | |
| 2238 | if (mem->userspace_addr & 0xffffful) |
| 2239 | return -EINVAL; |
| 2240 | |
| 2241 | if (mem->memory_size & 0xffffful) |
| 2242 | return -EINVAL; |
| 2243 | |
| 2244 | return 0; |
| 2245 | } |
| 2246 | |
| 2247 | void kvm_arch_commit_memory_region(struct kvm *kvm, |
| 2248 | struct kvm_userspace_memory_region *mem, |
| 2249 | const struct kvm_memory_slot *old, |
| 2250 | enum kvm_mr_change change) |
| 2251 | { |
| 2252 | int rc; |
| 2253 | |
| 2254 | /* If the basics of the memslot do not change, we do not want |
| 2255 | * to update the gmap. Every update causes several unnecessary |
| 2256 | * segment translation exceptions. This is usually handled just |
| 2257 | * fine by the normal fault handler + gmap, but it will also |
| 2258 | * cause faults on the prefix page of running guest CPUs. |
| 2259 | */ |
| 2260 | if (old->userspace_addr == mem->userspace_addr && |
| 2261 | old->base_gfn * PAGE_SIZE == mem->guest_phys_addr && |
| 2262 | old->npages * PAGE_SIZE == mem->memory_size) |
| 2263 | return; |
| 2264 | |
| 2265 | rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr, |
| 2266 | mem->guest_phys_addr, mem->memory_size); |
| 2267 | if (rc) |
| 2268 | printk(KERN_WARNING "kvm-s390: failed to commit memory region\n"); |
| 2269 | return; |
| 2270 | } |
| 2271 | |
| 2272 | static int __init kvm_s390_init(void) |
| 2273 | { |
| 2274 | return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); |
| 2275 | } |
| 2276 | |
| 2277 | static void __exit kvm_s390_exit(void) |
| 2278 | { |
| 2279 | kvm_exit(); |
| 2280 | } |
| 2281 | |
| 2282 | module_init(kvm_s390_init); |
| 2283 | module_exit(kvm_s390_exit); |
| 2284 | |
| 2285 | /* |
| 2286 | * Enable autoloading of the kvm module. |
| 2287 | * Note that we add the module alias here instead of virt/kvm/kvm_main.c |
| 2288 | * since x86 takes a different approach. |
| 2289 | */ |
| 2290 | #include <linux/miscdevice.h> |
| 2291 | MODULE_ALIAS_MISCDEV(KVM_MINOR); |
| 2292 | MODULE_ALIAS("devname:kvm"); |