1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 NetApp, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _VMM_H_ 32 #define _VMM_H_ 33 34 #include <sys/sdt.h> 35 #include <x86/segments.h> 36 37 struct vm_snapshot_meta; 38 39 #ifdef _KERNEL 40 SDT_PROVIDER_DECLARE(vmm); 41 #endif 42 43 enum vm_suspend_how { 44 VM_SUSPEND_NONE, 45 VM_SUSPEND_RESET, 46 VM_SUSPEND_POWEROFF, 47 VM_SUSPEND_HALT, 48 VM_SUSPEND_TRIPLEFAULT, 49 VM_SUSPEND_LAST 50 }; 51 52 /* 53 * Identifiers for architecturally defined registers. 54 */ 55 enum vm_reg_name { 56 VM_REG_GUEST_RAX, 57 VM_REG_GUEST_RBX, 58 VM_REG_GUEST_RCX, 59 VM_REG_GUEST_RDX, 60 VM_REG_GUEST_RSI, 61 VM_REG_GUEST_RDI, 62 VM_REG_GUEST_RBP, 63 VM_REG_GUEST_R8, 64 VM_REG_GUEST_R9, 65 VM_REG_GUEST_R10, 66 VM_REG_GUEST_R11, 67 VM_REG_GUEST_R12, 68 VM_REG_GUEST_R13, 69 VM_REG_GUEST_R14, 70 VM_REG_GUEST_R15, 71 VM_REG_GUEST_CR0, 72 VM_REG_GUEST_CR3, 73 VM_REG_GUEST_CR4, 74 VM_REG_GUEST_DR7, 75 VM_REG_GUEST_RSP, 76 VM_REG_GUEST_RIP, 77 VM_REG_GUEST_RFLAGS, 78 VM_REG_GUEST_ES, 79 VM_REG_GUEST_CS, 80 VM_REG_GUEST_SS, 81 VM_REG_GUEST_DS, 82 VM_REG_GUEST_FS, 83 VM_REG_GUEST_GS, 84 VM_REG_GUEST_LDTR, 85 VM_REG_GUEST_TR, 86 VM_REG_GUEST_IDTR, 87 VM_REG_GUEST_GDTR, 88 VM_REG_GUEST_EFER, 89 VM_REG_GUEST_CR2, 90 VM_REG_GUEST_PDPTE0, 91 VM_REG_GUEST_PDPTE1, 92 VM_REG_GUEST_PDPTE2, 93 VM_REG_GUEST_PDPTE3, 94 VM_REG_GUEST_INTR_SHADOW, 95 VM_REG_GUEST_DR0, 96 VM_REG_GUEST_DR1, 97 VM_REG_GUEST_DR2, 98 VM_REG_GUEST_DR3, 99 VM_REG_GUEST_DR6, 100 VM_REG_GUEST_ENTRY_INST_LENGTH, 101 VM_REG_LAST 102 }; 103 104 enum x2apic_state { 105 X2APIC_DISABLED, 106 X2APIC_ENABLED, 107 X2APIC_STATE_LAST 108 }; 109 110 #define VM_INTINFO_VECTOR(info) ((info) & 0xff) 111 #define VM_INTINFO_DEL_ERRCODE 0x800 112 #define VM_INTINFO_RSVD 0x7ffff000 113 #define VM_INTINFO_VALID 0x80000000 114 #define VM_INTINFO_TYPE 0x700 115 #define VM_INTINFO_HWINTR (0 << 8) 116 #define VM_INTINFO_NMI (2 << 8) 117 #define VM_INTINFO_HWEXCEPTION (3 << 8) 118 #define VM_INTINFO_SWINTR (4 << 8) 119 120 /* 121 * The VM name has to fit into the pathname length constraints of devfs, 122 * governed primarily by SPECNAMELEN. The length is the total number of 123 * characters in the full path, relative to the mount point and not 124 * including any leading '/' characters. 125 * A prefix and a suffix are added to the name specified by the user. 126 * The prefix is usually "vmm/" or "vmm.io/", but can be a few characters 127 * longer for future use. 128 * The suffix is a string that identifies a bootrom image or some similar 129 * image that is attached to the VM. A separator character gets added to 130 * the suffix automatically when generating the full path, so it must be 131 * accounted for, reducing the effective length by 1. 132 * The effective length of a VM name is 229 bytes for FreeBSD 13 and 37 133 * bytes for FreeBSD 12. A minimum length is set for safety and supports 134 * a SPECNAMELEN as small as 32 on old systems. 135 */ 136 #define VM_MAX_PREFIXLEN 10 137 #define VM_MAX_SUFFIXLEN 15 138 #define VM_MIN_NAMELEN 6 139 #define VM_MAX_NAMELEN \ 140 (SPECNAMELEN - VM_MAX_PREFIXLEN - VM_MAX_SUFFIXLEN - 1) 141 142 #ifdef _KERNEL 143 CTASSERT(VM_MAX_NAMELEN >= VM_MIN_NAMELEN); 144 145 struct vm; 146 struct vm_exception; 147 struct seg_desc; 148 struct vm_exit; 149 struct vm_run; 150 struct vhpet; 151 struct vioapic; 152 struct vlapic; 153 struct vmspace; 154 struct vm_object; 155 struct vm_guest_paging; 156 struct pmap; 157 enum snapshot_req; 158 159 struct vm_eventinfo { 160 void *rptr; /* rendezvous cookie */ 161 int *sptr; /* suspend cookie */ 162 int *iptr; /* reqidle cookie */ 163 }; 164 165 typedef int (*vmm_init_func_t)(int ipinum); 166 typedef int (*vmm_cleanup_func_t)(void); 167 typedef void (*vmm_resume_func_t)(void); 168 typedef void * (*vmi_init_func_t)(struct vm *vm, struct pmap *pmap); 169 typedef int (*vmi_run_func_t)(void *vmi, int vcpu, register_t rip, 170 struct pmap *pmap, struct vm_eventinfo *info); 171 typedef void (*vmi_cleanup_func_t)(void *vmi); 172 typedef int (*vmi_get_register_t)(void *vmi, int vcpu, int num, 173 uint64_t *retval); 174 typedef int (*vmi_set_register_t)(void *vmi, int vcpu, int num, 175 uint64_t val); 176 typedef int (*vmi_get_desc_t)(void *vmi, int vcpu, int num, 177 struct seg_desc *desc); 178 typedef int (*vmi_set_desc_t)(void *vmi, int vcpu, int num, 179 struct seg_desc *desc); 180 typedef int (*vmi_get_cap_t)(void *vmi, int vcpu, int num, int *retval); 181 typedef int (*vmi_set_cap_t)(void *vmi, int vcpu, int num, int val); 182 typedef struct vmspace * (*vmi_vmspace_alloc)(vm_offset_t min, vm_offset_t max); 183 typedef void (*vmi_vmspace_free)(struct vmspace *vmspace); 184 typedef struct vlapic * (*vmi_vlapic_init)(void *vmi, int vcpu); 185 typedef void (*vmi_vlapic_cleanup)(void *vmi, struct vlapic *vlapic); 186 typedef int (*vmi_snapshot_t)(void *vmi, struct vm_snapshot_meta *meta); 187 typedef int (*vmi_snapshot_vmcx_t)(void *vmi, struct vm_snapshot_meta *meta, 188 int vcpu); 189 typedef int (*vmi_restore_tsc_t)(void *vmi, int vcpuid, uint64_t now); 190 191 struct vmm_ops { 192 vmm_init_func_t init; /* module wide initialization */ 193 vmm_cleanup_func_t cleanup; 194 vmm_resume_func_t resume; 195 196 vmi_init_func_t vminit; /* vm-specific initialization */ 197 vmi_run_func_t vmrun; 198 vmi_cleanup_func_t vmcleanup; 199 vmi_get_register_t vmgetreg; 200 vmi_set_register_t vmsetreg; 201 vmi_get_desc_t vmgetdesc; 202 vmi_set_desc_t vmsetdesc; 203 vmi_get_cap_t vmgetcap; 204 vmi_set_cap_t vmsetcap; 205 vmi_vmspace_alloc vmspace_alloc; 206 vmi_vmspace_free vmspace_free; 207 vmi_vlapic_init vlapic_init; 208 vmi_vlapic_cleanup vlapic_cleanup; 209 210 /* checkpoint operations */ 211 vmi_snapshot_t vmsnapshot; 212 vmi_snapshot_vmcx_t vmcx_snapshot; 213 vmi_restore_tsc_t vm_restore_tsc; 214 }; 215 216 extern struct vmm_ops vmm_ops_intel; 217 extern struct vmm_ops vmm_ops_amd; 218 219 int vm_create(const char *name, struct vm **retvm); 220 void vm_destroy(struct vm *vm); 221 int vm_reinit(struct vm *vm); 222 const char *vm_name(struct vm *vm); 223 uint16_t vm_get_maxcpus(struct vm *vm); 224 void vm_get_topology(struct vm *vm, uint16_t *sockets, uint16_t *cores, 225 uint16_t *threads, uint16_t *maxcpus); 226 int vm_set_topology(struct vm *vm, uint16_t sockets, uint16_t cores, 227 uint16_t threads, uint16_t maxcpus); 228 229 /* 230 * APIs that modify the guest memory map require all vcpus to be frozen. 231 */ 232 int vm_mmap_memseg(struct vm *vm, vm_paddr_t gpa, int segid, vm_ooffset_t off, 233 size_t len, int prot, int flags); 234 int vm_alloc_memseg(struct vm *vm, int ident, size_t len, bool sysmem); 235 void vm_free_memseg(struct vm *vm, int ident); 236 int vm_map_mmio(struct vm *vm, vm_paddr_t gpa, size_t len, vm_paddr_t hpa); 237 int vm_unmap_mmio(struct vm *vm, vm_paddr_t gpa, size_t len); 238 int vm_assign_pptdev(struct vm *vm, int bus, int slot, int func); 239 int vm_unassign_pptdev(struct vm *vm, int bus, int slot, int func); 240 241 /* 242 * APIs that inspect the guest memory map require only a *single* vcpu to 243 * be frozen. This acts like a read lock on the guest memory map since any 244 * modification requires *all* vcpus to be frozen. 245 */ 246 int vm_mmap_getnext(struct vm *vm, vm_paddr_t *gpa, int *segid, 247 vm_ooffset_t *segoff, size_t *len, int *prot, int *flags); 248 int vm_get_memseg(struct vm *vm, int ident, size_t *len, bool *sysmem, 249 struct vm_object **objptr); 250 vm_paddr_t vmm_sysmem_maxaddr(struct vm *vm); 251 void *vm_gpa_hold(struct vm *, int vcpuid, vm_paddr_t gpa, size_t len, 252 int prot, void **cookie); 253 void vm_gpa_release(void *cookie); 254 bool vm_mem_allocated(struct vm *vm, int vcpuid, vm_paddr_t gpa); 255 256 int vm_get_register(struct vm *vm, int vcpu, int reg, uint64_t *retval); 257 int vm_set_register(struct vm *vm, int vcpu, int reg, uint64_t val); 258 int vm_get_seg_desc(struct vm *vm, int vcpu, int reg, 259 struct seg_desc *ret_desc); 260 int vm_set_seg_desc(struct vm *vm, int vcpu, int reg, 261 struct seg_desc *desc); 262 int vm_run(struct vm *vm, struct vm_run *vmrun); 263 int vm_suspend(struct vm *vm, enum vm_suspend_how how); 264 int vm_inject_nmi(struct vm *vm, int vcpu); 265 int vm_nmi_pending(struct vm *vm, int vcpuid); 266 void vm_nmi_clear(struct vm *vm, int vcpuid); 267 int vm_inject_extint(struct vm *vm, int vcpu); 268 int vm_extint_pending(struct vm *vm, int vcpuid); 269 void vm_extint_clear(struct vm *vm, int vcpuid); 270 struct vlapic *vm_lapic(struct vm *vm, int cpu); 271 struct vioapic *vm_ioapic(struct vm *vm); 272 struct vhpet *vm_hpet(struct vm *vm); 273 int vm_get_capability(struct vm *vm, int vcpu, int type, int *val); 274 int vm_set_capability(struct vm *vm, int vcpu, int type, int val); 275 int vm_get_x2apic_state(struct vm *vm, int vcpu, enum x2apic_state *state); 276 int vm_set_x2apic_state(struct vm *vm, int vcpu, enum x2apic_state state); 277 int vm_apicid2vcpuid(struct vm *vm, int apicid); 278 int vm_activate_cpu(struct vm *vm, int vcpu); 279 int vm_suspend_cpu(struct vm *vm, int vcpu); 280 int vm_resume_cpu(struct vm *vm, int vcpu); 281 struct vm_exit *vm_exitinfo(struct vm *vm, int vcpuid); 282 void vm_exit_suspended(struct vm *vm, int vcpuid, uint64_t rip); 283 void vm_exit_debug(struct vm *vm, int vcpuid, uint64_t rip); 284 void vm_exit_rendezvous(struct vm *vm, int vcpuid, uint64_t rip); 285 void vm_exit_astpending(struct vm *vm, int vcpuid, uint64_t rip); 286 void vm_exit_reqidle(struct vm *vm, int vcpuid, uint64_t rip); 287 int vm_snapshot_req(struct vm *vm, struct vm_snapshot_meta *meta); 288 int vm_restore_time(struct vm *vm); 289 290 291 #ifdef _SYS__CPUSET_H_ 292 /* 293 * Rendezvous all vcpus specified in 'dest' and execute 'func(arg)'. 294 * The rendezvous 'func(arg)' is not allowed to do anything that will 295 * cause the thread to be put to sleep. 296 * 297 * If the rendezvous is being initiated from a vcpu context then the 298 * 'vcpuid' must refer to that vcpu, otherwise it should be set to -1. 299 * 300 * The caller cannot hold any locks when initiating the rendezvous. 301 * 302 * The implementation of this API may cause vcpus other than those specified 303 * by 'dest' to be stalled. The caller should not rely on any vcpus making 304 * forward progress when the rendezvous is in progress. 305 */ 306 typedef void (*vm_rendezvous_func_t)(struct vm *vm, int vcpuid, void *arg); 307 int vm_smp_rendezvous(struct vm *vm, int vcpuid, cpuset_t dest, 308 vm_rendezvous_func_t func, void *arg); 309 cpuset_t vm_active_cpus(struct vm *vm); 310 cpuset_t vm_debug_cpus(struct vm *vm); 311 cpuset_t vm_suspended_cpus(struct vm *vm); 312 #endif /* _SYS__CPUSET_H_ */ 313 314 static __inline int 315 vcpu_rendezvous_pending(struct vm_eventinfo *info) 316 { 317 318 return (*((uintptr_t *)(info->rptr)) != 0); 319 } 320 321 static __inline int 322 vcpu_suspended(struct vm_eventinfo *info) 323 { 324 325 return (*info->sptr); 326 } 327 328 static __inline int 329 vcpu_reqidle(struct vm_eventinfo *info) 330 { 331 332 return (*info->iptr); 333 } 334 335 int vcpu_debugged(struct vm *vm, int vcpuid); 336 337 /* 338 * Return true if device indicated by bus/slot/func is supposed to be a 339 * pci passthrough device. 340 * 341 * Return false otherwise. 342 */ 343 bool vmm_is_pptdev(int bus, int slot, int func); 344 345 void *vm_iommu_domain(struct vm *vm); 346 347 enum vcpu_state { 348 VCPU_IDLE, 349 VCPU_FROZEN, 350 VCPU_RUNNING, 351 VCPU_SLEEPING, 352 }; 353 354 int vcpu_set_state(struct vm *vm, int vcpu, enum vcpu_state state, 355 bool from_idle); 356 enum vcpu_state vcpu_get_state(struct vm *vm, int vcpu, int *hostcpu); 357 358 static int __inline 359 vcpu_is_running(struct vm *vm, int vcpu, int *hostcpu) 360 { 361 return (vcpu_get_state(vm, vcpu, hostcpu) == VCPU_RUNNING); 362 } 363 364 #ifdef _SYS_PROC_H_ 365 static int __inline 366 vcpu_should_yield(struct vm *vm, int vcpu) 367 { 368 369 if (curthread->td_flags & (TDF_ASTPENDING | TDF_NEEDRESCHED)) 370 return (1); 371 else if (curthread->td_owepreempt) 372 return (1); 373 else 374 return (0); 375 } 376 #endif 377 378 void *vcpu_stats(struct vm *vm, int vcpu); 379 void vcpu_notify_event(struct vm *vm, int vcpuid, bool lapic_intr); 380 struct vmspace *vm_get_vmspace(struct vm *vm); 381 struct vatpic *vm_atpic(struct vm *vm); 382 struct vatpit *vm_atpit(struct vm *vm); 383 struct vpmtmr *vm_pmtmr(struct vm *vm); 384 struct vrtc *vm_rtc(struct vm *vm); 385 386 /* 387 * Inject exception 'vector' into the guest vcpu. This function returns 0 on 388 * success and non-zero on failure. 389 * 390 * Wrapper functions like 'vm_inject_gp()' should be preferred to calling 391 * this function directly because they enforce the trap-like or fault-like 392 * behavior of an exception. 393 * 394 * This function should only be called in the context of the thread that is 395 * executing this vcpu. 396 */ 397 int vm_inject_exception(struct vm *vm, int vcpuid, int vector, int err_valid, 398 uint32_t errcode, int restart_instruction); 399 400 /* 401 * This function is called after a VM-exit that occurred during exception or 402 * interrupt delivery through the IDT. The format of 'intinfo' is described 403 * in Figure 15-1, "EXITINTINFO for All Intercepts", APM, Vol 2. 404 * 405 * If a VM-exit handler completes the event delivery successfully then it 406 * should call vm_exit_intinfo() to extinguish the pending event. For e.g., 407 * if the task switch emulation is triggered via a task gate then it should 408 * call this function with 'intinfo=0' to indicate that the external event 409 * is not pending anymore. 410 * 411 * Return value is 0 on success and non-zero on failure. 412 */ 413 int vm_exit_intinfo(struct vm *vm, int vcpuid, uint64_t intinfo); 414 415 /* 416 * This function is called before every VM-entry to retrieve a pending 417 * event that should be injected into the guest. This function combines 418 * nested events into a double or triple fault. 419 * 420 * Returns 0 if there are no events that need to be injected into the guest 421 * and non-zero otherwise. 422 */ 423 int vm_entry_intinfo(struct vm *vm, int vcpuid, uint64_t *info); 424 425 int vm_get_intinfo(struct vm *vm, int vcpuid, uint64_t *info1, uint64_t *info2); 426 427 /* 428 * Function used to keep track of the guest's TSC offset. The 429 * offset is used by the virutalization extensions to provide a consistent 430 * value for the Time Stamp Counter to the guest. 431 * 432 * Return value is 0 on success and non-zero on failure. 433 */ 434 int vm_set_tsc_offset(struct vm *vm, int vcpu_id, uint64_t offset); 435 436 enum vm_reg_name vm_segment_name(int seg_encoding); 437 438 struct vm_copyinfo { 439 uint64_t gpa; 440 size_t len; 441 void *hva; 442 void *cookie; 443 }; 444 445 /* 446 * Set up 'copyinfo[]' to copy to/from guest linear address space starting 447 * at 'gla' and 'len' bytes long. The 'prot' should be set to PROT_READ for 448 * a copyin or PROT_WRITE for a copyout. 449 * 450 * retval is_fault Interpretation 451 * 0 0 Success 452 * 0 1 An exception was injected into the guest 453 * EFAULT N/A Unrecoverable error 454 * 455 * The 'copyinfo[]' can be passed to 'vm_copyin()' or 'vm_copyout()' only if 456 * the return value is 0. The 'copyinfo[]' resources should be freed by calling 457 * 'vm_copy_teardown()' after the copy is done. 458 */ 459 int vm_copy_setup(struct vm *vm, int vcpuid, struct vm_guest_paging *paging, 460 uint64_t gla, size_t len, int prot, struct vm_copyinfo *copyinfo, 461 int num_copyinfo, int *is_fault); 462 void vm_copy_teardown(struct vm *vm, int vcpuid, struct vm_copyinfo *copyinfo, 463 int num_copyinfo); 464 void vm_copyin(struct vm *vm, int vcpuid, struct vm_copyinfo *copyinfo, 465 void *kaddr, size_t len); 466 void vm_copyout(struct vm *vm, int vcpuid, const void *kaddr, 467 struct vm_copyinfo *copyinfo, size_t len); 468 469 int vcpu_trace_exceptions(struct vm *vm, int vcpuid); 470 #endif /* KERNEL */ 471 472 #define VM_MAXCPU 16 /* maximum virtual cpus */ 473 474 /* 475 * Identifiers for optional vmm capabilities 476 */ 477 enum vm_cap_type { 478 VM_CAP_HALT_EXIT, 479 VM_CAP_MTRAP_EXIT, 480 VM_CAP_PAUSE_EXIT, 481 VM_CAP_UNRESTRICTED_GUEST, 482 VM_CAP_ENABLE_INVPCID, 483 VM_CAP_BPT_EXIT, 484 VM_CAP_MAX 485 }; 486 487 enum vm_intr_trigger { 488 EDGE_TRIGGER, 489 LEVEL_TRIGGER 490 }; 491 492 /* 493 * The 'access' field has the format specified in Table 21-2 of the Intel 494 * Architecture Manual vol 3b. 495 * 496 * XXX The contents of the 'access' field are architecturally defined except 497 * bit 16 - Segment Unusable. 498 */ 499 struct seg_desc { 500 uint64_t base; 501 uint32_t limit; 502 uint32_t access; 503 }; 504 #define SEG_DESC_TYPE(access) ((access) & 0x001f) 505 #define SEG_DESC_DPL(access) (((access) >> 5) & 0x3) 506 #define SEG_DESC_PRESENT(access) (((access) & 0x0080) ? 1 : 0) 507 #define SEG_DESC_DEF32(access) (((access) & 0x4000) ? 1 : 0) 508 #define SEG_DESC_GRANULARITY(access) (((access) & 0x8000) ? 1 : 0) 509 #define SEG_DESC_UNUSABLE(access) (((access) & 0x10000) ? 1 : 0) 510 511 enum vm_cpu_mode { 512 CPU_MODE_REAL, 513 CPU_MODE_PROTECTED, 514 CPU_MODE_COMPATIBILITY, /* IA-32E mode (CS.L = 0) */ 515 CPU_MODE_64BIT, /* IA-32E mode (CS.L = 1) */ 516 }; 517 518 enum vm_paging_mode { 519 PAGING_MODE_FLAT, 520 PAGING_MODE_32, 521 PAGING_MODE_PAE, 522 PAGING_MODE_64, 523 }; 524 525 struct vm_guest_paging { 526 uint64_t cr3; 527 int cpl; 528 enum vm_cpu_mode cpu_mode; 529 enum vm_paging_mode paging_mode; 530 }; 531 532 /* 533 * The data structures 'vie' and 'vie_op' are meant to be opaque to the 534 * consumers of instruction decoding. The only reason why their contents 535 * need to be exposed is because they are part of the 'vm_exit' structure. 536 */ 537 struct vie_op { 538 uint8_t op_byte; /* actual opcode byte */ 539 uint8_t op_type; /* type of operation (e.g. MOV) */ 540 uint16_t op_flags; 541 }; 542 _Static_assert(sizeof(struct vie_op) == 4, "ABI"); 543 _Static_assert(_Alignof(struct vie_op) == 2, "ABI"); 544 545 #define VIE_INST_SIZE 15 546 struct vie { 547 uint8_t inst[VIE_INST_SIZE]; /* instruction bytes */ 548 uint8_t num_valid; /* size of the instruction */ 549 550 /* The following fields are all zeroed upon restart. */ 551 #define vie_startzero num_processed 552 uint8_t num_processed; 553 554 uint8_t addrsize:4, opsize:4; /* address and operand sizes */ 555 uint8_t rex_w:1, /* REX prefix */ 556 rex_r:1, 557 rex_x:1, 558 rex_b:1, 559 rex_present:1, 560 repz_present:1, /* REP/REPE/REPZ prefix */ 561 repnz_present:1, /* REPNE/REPNZ prefix */ 562 opsize_override:1, /* Operand size override */ 563 addrsize_override:1, /* Address size override */ 564 segment_override:1; /* Segment override */ 565 566 uint8_t mod:2, /* ModRM byte */ 567 reg:4, 568 rm:4; 569 570 uint8_t ss:2, /* SIB byte */ 571 vex_present:1, /* VEX prefixed */ 572 vex_l:1, /* L bit */ 573 index:4, /* SIB byte */ 574 base:4; /* SIB byte */ 575 576 uint8_t disp_bytes; 577 uint8_t imm_bytes; 578 579 uint8_t scale; 580 581 uint8_t vex_reg:4, /* vvvv: first source register specifier */ 582 vex_pp:2, /* pp */ 583 _sparebits:2; 584 585 uint8_t _sparebytes[2]; 586 587 int base_register; /* VM_REG_GUEST_xyz */ 588 int index_register; /* VM_REG_GUEST_xyz */ 589 int segment_register; /* VM_REG_GUEST_xyz */ 590 591 int64_t displacement; /* optional addr displacement */ 592 int64_t immediate; /* optional immediate operand */ 593 594 uint8_t decoded; /* set to 1 if successfully decoded */ 595 596 uint8_t _sparebyte; 597 598 struct vie_op op; /* opcode description */ 599 }; 600 _Static_assert(sizeof(struct vie) == 64, "ABI"); 601 _Static_assert(__offsetof(struct vie, disp_bytes) == 22, "ABI"); 602 _Static_assert(__offsetof(struct vie, scale) == 24, "ABI"); 603 _Static_assert(__offsetof(struct vie, base_register) == 28, "ABI"); 604 605 enum vm_exitcode { 606 VM_EXITCODE_INOUT, 607 VM_EXITCODE_VMX, 608 VM_EXITCODE_BOGUS, 609 VM_EXITCODE_RDMSR, 610 VM_EXITCODE_WRMSR, 611 VM_EXITCODE_HLT, 612 VM_EXITCODE_MTRAP, 613 VM_EXITCODE_PAUSE, 614 VM_EXITCODE_PAGING, 615 VM_EXITCODE_INST_EMUL, 616 VM_EXITCODE_SPINUP_AP, 617 VM_EXITCODE_DEPRECATED1, /* used to be SPINDOWN_CPU */ 618 VM_EXITCODE_RENDEZVOUS, 619 VM_EXITCODE_IOAPIC_EOI, 620 VM_EXITCODE_SUSPENDED, 621 VM_EXITCODE_INOUT_STR, 622 VM_EXITCODE_TASK_SWITCH, 623 VM_EXITCODE_MONITOR, 624 VM_EXITCODE_MWAIT, 625 VM_EXITCODE_SVM, 626 VM_EXITCODE_REQIDLE, 627 VM_EXITCODE_DEBUG, 628 VM_EXITCODE_VMINSN, 629 VM_EXITCODE_BPT, 630 VM_EXITCODE_MAX 631 }; 632 633 struct vm_inout { 634 uint16_t bytes:3; /* 1 or 2 or 4 */ 635 uint16_t in:1; 636 uint16_t string:1; 637 uint16_t rep:1; 638 uint16_t port; 639 uint32_t eax; /* valid for out */ 640 }; 641 642 struct vm_inout_str { 643 struct vm_inout inout; /* must be the first element */ 644 struct vm_guest_paging paging; 645 uint64_t rflags; 646 uint64_t cr0; 647 uint64_t index; 648 uint64_t count; /* rep=1 (%rcx), rep=0 (1) */ 649 int addrsize; 650 enum vm_reg_name seg_name; 651 struct seg_desc seg_desc; 652 }; 653 654 enum task_switch_reason { 655 TSR_CALL, 656 TSR_IRET, 657 TSR_JMP, 658 TSR_IDT_GATE, /* task gate in IDT */ 659 }; 660 661 struct vm_task_switch { 662 uint16_t tsssel; /* new TSS selector */ 663 int ext; /* task switch due to external event */ 664 uint32_t errcode; 665 int errcode_valid; /* push 'errcode' on the new stack */ 666 enum task_switch_reason reason; 667 struct vm_guest_paging paging; 668 }; 669 670 struct vm_exit { 671 enum vm_exitcode exitcode; 672 int inst_length; /* 0 means unknown */ 673 uint64_t rip; 674 union { 675 struct vm_inout inout; 676 struct vm_inout_str inout_str; 677 struct { 678 uint64_t gpa; 679 int fault_type; 680 } paging; 681 struct { 682 uint64_t gpa; 683 uint64_t gla; 684 uint64_t cs_base; 685 int cs_d; /* CS.D */ 686 struct vm_guest_paging paging; 687 struct vie vie; 688 } inst_emul; 689 /* 690 * VMX specific payload. Used when there is no "better" 691 * exitcode to represent the VM-exit. 692 */ 693 struct { 694 int status; /* vmx inst status */ 695 /* 696 * 'exit_reason' and 'exit_qualification' are valid 697 * only if 'status' is zero. 698 */ 699 uint32_t exit_reason; 700 uint64_t exit_qualification; 701 /* 702 * 'inst_error' and 'inst_type' are valid 703 * only if 'status' is non-zero. 704 */ 705 int inst_type; 706 int inst_error; 707 } vmx; 708 /* 709 * SVM specific payload. 710 */ 711 struct { 712 uint64_t exitcode; 713 uint64_t exitinfo1; 714 uint64_t exitinfo2; 715 } svm; 716 struct { 717 int inst_length; 718 } bpt; 719 struct { 720 uint32_t code; /* ecx value */ 721 uint64_t wval; 722 } msr; 723 struct { 724 int vcpu; 725 uint64_t rip; 726 } spinup_ap; 727 struct { 728 uint64_t rflags; 729 uint64_t intr_status; 730 } hlt; 731 struct { 732 int vector; 733 } ioapic_eoi; 734 struct { 735 enum vm_suspend_how how; 736 } suspended; 737 struct vm_task_switch task_switch; 738 } u; 739 }; 740 741 /* APIs to inject faults into the guest */ 742 void vm_inject_fault(void *vm, int vcpuid, int vector, int errcode_valid, 743 int errcode); 744 745 static __inline void 746 vm_inject_ud(void *vm, int vcpuid) 747 { 748 vm_inject_fault(vm, vcpuid, IDT_UD, 0, 0); 749 } 750 751 static __inline void 752 vm_inject_gp(void *vm, int vcpuid) 753 { 754 vm_inject_fault(vm, vcpuid, IDT_GP, 1, 0); 755 } 756 757 static __inline void 758 vm_inject_ac(void *vm, int vcpuid, int errcode) 759 { 760 vm_inject_fault(vm, vcpuid, IDT_AC, 1, errcode); 761 } 762 763 static __inline void 764 vm_inject_ss(void *vm, int vcpuid, int errcode) 765 { 766 vm_inject_fault(vm, vcpuid, IDT_SS, 1, errcode); 767 } 768 769 void vm_inject_pf(void *vm, int vcpuid, int error_code, uint64_t cr2); 770 771 int vm_restart_instruction(void *vm, int vcpuid); 772 773 #endif /* _VMM_H_ */ 774