1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
29 #ifndef _VMM_H_
30 #define _VMM_H_
31
32 #include <sys/cpuset.h>
33 #include <sys/sdt.h>
34 #include <x86/segments.h>
35
36 struct vcpu;
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_DESTROY,
50 VM_SUSPEND_LAST
51 };
52
53 /*
54 * Identifiers for architecturally defined registers.
55 */
56 enum vm_reg_name {
57 VM_REG_GUEST_RAX,
58 VM_REG_GUEST_RBX,
59 VM_REG_GUEST_RCX,
60 VM_REG_GUEST_RDX,
61 VM_REG_GUEST_RSI,
62 VM_REG_GUEST_RDI,
63 VM_REG_GUEST_RBP,
64 VM_REG_GUEST_R8,
65 VM_REG_GUEST_R9,
66 VM_REG_GUEST_R10,
67 VM_REG_GUEST_R11,
68 VM_REG_GUEST_R12,
69 VM_REG_GUEST_R13,
70 VM_REG_GUEST_R14,
71 VM_REG_GUEST_R15,
72 VM_REG_GUEST_CR0,
73 VM_REG_GUEST_CR3,
74 VM_REG_GUEST_CR4,
75 VM_REG_GUEST_DR7,
76 VM_REG_GUEST_RSP,
77 VM_REG_GUEST_RIP,
78 VM_REG_GUEST_RFLAGS,
79 VM_REG_GUEST_ES,
80 VM_REG_GUEST_CS,
81 VM_REG_GUEST_SS,
82 VM_REG_GUEST_DS,
83 VM_REG_GUEST_FS,
84 VM_REG_GUEST_GS,
85 VM_REG_GUEST_LDTR,
86 VM_REG_GUEST_TR,
87 VM_REG_GUEST_IDTR,
88 VM_REG_GUEST_GDTR,
89 VM_REG_GUEST_EFER,
90 VM_REG_GUEST_CR2,
91 VM_REG_GUEST_PDPTE0,
92 VM_REG_GUEST_PDPTE1,
93 VM_REG_GUEST_PDPTE2,
94 VM_REG_GUEST_PDPTE3,
95 VM_REG_GUEST_INTR_SHADOW,
96 VM_REG_GUEST_DR0,
97 VM_REG_GUEST_DR1,
98 VM_REG_GUEST_DR2,
99 VM_REG_GUEST_DR3,
100 VM_REG_GUEST_DR6,
101 VM_REG_GUEST_ENTRY_INST_LENGTH,
102 VM_REG_GUEST_FS_BASE,
103 VM_REG_GUEST_GS_BASE,
104 VM_REG_GUEST_KGS_BASE,
105 VM_REG_GUEST_TPR,
106 VM_REG_LAST
107 };
108
109 enum x2apic_state {
110 X2APIC_DISABLED,
111 X2APIC_ENABLED,
112 X2APIC_STATE_LAST
113 };
114
115 #define VM_INTINFO_VECTOR(info) ((info) & 0xff)
116 #define VM_INTINFO_DEL_ERRCODE 0x800
117 #define VM_INTINFO_RSVD 0x7ffff000
118 #define VM_INTINFO_VALID 0x80000000
119 #define VM_INTINFO_TYPE 0x700
120 #define VM_INTINFO_HWINTR (0 << 8)
121 #define VM_INTINFO_NMI (2 << 8)
122 #define VM_INTINFO_HWEXCEPTION (3 << 8)
123 #define VM_INTINFO_SWINTR (4 << 8)
124
125 /*
126 * The VM name has to fit into the pathname length constraints of devfs,
127 * governed primarily by SPECNAMELEN. The length is the total number of
128 * characters in the full path, relative to the mount point and not
129 * including any leading '/' characters.
130 * A prefix and a suffix are added to the name specified by the user.
131 * The prefix is usually "vmm/" or "vmm.io/", but can be a few characters
132 * longer for future use.
133 * The suffix is a string that identifies a bootrom image or some similar
134 * image that is attached to the VM. A separator character gets added to
135 * the suffix automatically when generating the full path, so it must be
136 * accounted for, reducing the effective length by 1.
137 * The effective length of a VM name is 229 bytes for FreeBSD 13 and 37
138 * bytes for FreeBSD 12. A minimum length is set for safety and supports
139 * a SPECNAMELEN as small as 32 on old systems.
140 */
141 #define VM_MAX_PREFIXLEN 10
142 #define VM_MAX_SUFFIXLEN 15
143 #define VM_MIN_NAMELEN 6
144 #define VM_MAX_NAMELEN \
145 (SPECNAMELEN - VM_MAX_PREFIXLEN - VM_MAX_SUFFIXLEN - 1)
146
147 #ifdef _KERNEL
148 #include <sys/kassert.h>
149
150 CTASSERT(VM_MAX_NAMELEN >= VM_MIN_NAMELEN);
151
152 struct vm;
153 struct vm_exception;
154 struct vm_mem;
155 struct seg_desc;
156 struct vm_exit;
157 struct vm_run;
158 struct vhpet;
159 struct vioapic;
160 struct vlapic;
161 struct vmspace;
162 struct vm_object;
163 struct vm_guest_paging;
164 struct pmap;
165 enum snapshot_req;
166
167 struct vm_eventinfo {
168 cpuset_t *rptr; /* rendezvous cookie */
169 int *sptr; /* suspend cookie */
170 int *iptr; /* reqidle cookie */
171 };
172
173 typedef int (*vmm_init_func_t)(int ipinum);
174 typedef int (*vmm_cleanup_func_t)(void);
175 typedef void (*vmm_suspend_func_t)(void);
176 typedef void (*vmm_resume_func_t)(void);
177 typedef void * (*vmi_init_func_t)(struct vm *vm, struct pmap *pmap);
178 typedef int (*vmi_run_func_t)(void *vcpui, register_t rip,
179 struct pmap *pmap, struct vm_eventinfo *info);
180 typedef void (*vmi_cleanup_func_t)(void *vmi);
181 typedef void * (*vmi_vcpu_init_func_t)(void *vmi, struct vcpu *vcpu,
182 int vcpu_id);
183 typedef void (*vmi_vcpu_cleanup_func_t)(void *vcpui);
184 typedef int (*vmi_get_register_t)(void *vcpui, int num, uint64_t *retval);
185 typedef int (*vmi_set_register_t)(void *vcpui, int num, uint64_t val);
186 typedef int (*vmi_get_desc_t)(void *vcpui, int num, struct seg_desc *desc);
187 typedef int (*vmi_set_desc_t)(void *vcpui, int num, struct seg_desc *desc);
188 typedef int (*vmi_get_cap_t)(void *vcpui, int num, int *retval);
189 typedef int (*vmi_set_cap_t)(void *vcpui, int num, int val);
190 typedef struct vmspace * (*vmi_vmspace_alloc)(vm_offset_t min, vm_offset_t max);
191 typedef void (*vmi_vmspace_free)(struct vmspace *vmspace);
192 typedef struct vlapic * (*vmi_vlapic_init)(void *vcpui);
193 typedef void (*vmi_vlapic_cleanup)(struct vlapic *vlapic);
194 typedef int (*vmi_snapshot_vcpu_t)(void *vcpui, struct vm_snapshot_meta *meta);
195 typedef int (*vmi_restore_tsc_t)(void *vcpui, uint64_t now);
196
197 struct vmm_ops {
198 vmm_init_func_t modinit; /* module wide initialization */
199 vmm_cleanup_func_t modcleanup;
200 vmm_resume_func_t modsuspend;
201 vmm_resume_func_t modresume;
202
203 vmi_init_func_t init; /* vm-specific initialization */
204 vmi_run_func_t run;
205 vmi_cleanup_func_t cleanup;
206 vmi_vcpu_init_func_t vcpu_init;
207 vmi_vcpu_cleanup_func_t vcpu_cleanup;
208 vmi_get_register_t getreg;
209 vmi_set_register_t setreg;
210 vmi_get_desc_t getdesc;
211 vmi_set_desc_t setdesc;
212 vmi_get_cap_t getcap;
213 vmi_set_cap_t setcap;
214 vmi_vmspace_alloc vmspace_alloc;
215 vmi_vmspace_free vmspace_free;
216 vmi_vlapic_init vlapic_init;
217 vmi_vlapic_cleanup vlapic_cleanup;
218
219 /* checkpoint operations */
220 vmi_snapshot_vcpu_t vcpu_snapshot;
221 vmi_restore_tsc_t restore_tsc;
222 };
223
224 extern const struct vmm_ops vmm_ops_intel;
225 extern const struct vmm_ops vmm_ops_amd;
226
227 extern u_int vm_maxcpu; /* maximum virtual cpus */
228
229 int vm_create(const char *name, struct vm **retvm);
230 struct vcpu *vm_alloc_vcpu(struct vm *vm, int vcpuid);
231 void vm_disable_vcpu_creation(struct vm *vm);
232 void vm_slock_vcpus(struct vm *vm);
233 void vm_unlock_vcpus(struct vm *vm);
234 void vm_destroy(struct vm *vm);
235 int vm_reinit(struct vm *vm);
236 const char *vm_name(struct vm *vm);
237 uint16_t vm_get_maxcpus(struct vm *vm);
238 void vm_get_topology(struct vm *vm, uint16_t *sockets, uint16_t *cores,
239 uint16_t *threads, uint16_t *maxcpus);
240 int vm_set_topology(struct vm *vm, uint16_t sockets, uint16_t cores,
241 uint16_t threads, uint16_t maxcpus);
242
243 int vm_map_mmio(struct vm *vm, vm_paddr_t gpa, size_t len, vm_paddr_t hpa);
244 int vm_unmap_mmio(struct vm *vm, vm_paddr_t gpa, size_t len);
245 int vm_assign_pptdev(struct vm *vm, int bus, int slot, int func);
246 int vm_unassign_pptdev(struct vm *vm, int bus, int slot, int func);
247
248 int vm_get_register(struct vcpu *vcpu, int reg, uint64_t *retval);
249 int vm_set_register(struct vcpu *vcpu, int reg, uint64_t val);
250 int vm_get_seg_desc(struct vcpu *vcpu, int reg,
251 struct seg_desc *ret_desc);
252 int vm_set_seg_desc(struct vcpu *vcpu, int reg,
253 struct seg_desc *desc);
254 int vm_run(struct vcpu *vcpu);
255 int vm_suspend(struct vm *vm, enum vm_suspend_how how);
256 int vm_inject_nmi(struct vcpu *vcpu);
257 int vm_nmi_pending(struct vcpu *vcpu);
258 void vm_nmi_clear(struct vcpu *vcpu);
259 int vm_inject_extint(struct vcpu *vcpu);
260 int vm_extint_pending(struct vcpu *vcpu);
261 void vm_extint_clear(struct vcpu *vcpu);
262 int vcpu_vcpuid(struct vcpu *vcpu);
263 struct vm *vcpu_vm(struct vcpu *vcpu);
264 struct vcpu *vm_vcpu(struct vm *vm, int cpu);
265 struct vlapic *vm_lapic(struct vcpu *vcpu);
266 struct vioapic *vm_ioapic(struct vm *vm);
267 struct vhpet *vm_hpet(struct vm *vm);
268 int vm_get_capability(struct vcpu *vcpu, int type, int *val);
269 int vm_set_capability(struct vcpu *vcpu, int type, int val);
270 int vm_get_x2apic_state(struct vcpu *vcpu, enum x2apic_state *state);
271 int vm_set_x2apic_state(struct vcpu *vcpu, enum x2apic_state state);
272 int vm_apicid2vcpuid(struct vm *vm, int apicid);
273 int vm_activate_cpu(struct vcpu *vcpu);
274 int vm_suspend_cpu(struct vm *vm, struct vcpu *vcpu);
275 int vm_resume_cpu(struct vm *vm, struct vcpu *vcpu);
276 int vm_restart_instruction(struct vcpu *vcpu);
277 struct vm_exit *vm_exitinfo(struct vcpu *vcpu);
278 cpuset_t *vm_exitinfo_cpuset(struct vcpu *vcpu);
279 void vm_exit_suspended(struct vcpu *vcpu, uint64_t rip);
280 void vm_exit_debug(struct vcpu *vcpu, uint64_t rip);
281 void vm_exit_rendezvous(struct vcpu *vcpu, uint64_t rip);
282 void vm_exit_astpending(struct vcpu *vcpu, uint64_t rip);
283 void vm_exit_reqidle(struct vcpu *vcpu, uint64_t rip);
284 int vm_snapshot_req(struct vm *vm, struct vm_snapshot_meta *meta);
285 int vm_restore_time(struct vm *vm);
286
287 #ifdef _SYS__CPUSET_H_
288 /*
289 * Rendezvous all vcpus specified in 'dest' and execute 'func(arg)'.
290 * The rendezvous 'func(arg)' is not allowed to do anything that will
291 * cause the thread to be put to sleep.
292 *
293 * The caller cannot hold any locks when initiating the rendezvous.
294 *
295 * The implementation of this API may cause vcpus other than those specified
296 * by 'dest' to be stalled. The caller should not rely on any vcpus making
297 * forward progress when the rendezvous is in progress.
298 */
299 typedef void (*vm_rendezvous_func_t)(struct vcpu *vcpu, void *arg);
300 int vm_smp_rendezvous(struct vcpu *vcpu, cpuset_t dest,
301 vm_rendezvous_func_t func, void *arg);
302
303 cpuset_t vm_active_cpus(struct vm *vm);
304 cpuset_t vm_debug_cpus(struct vm *vm);
305 cpuset_t vm_suspended_cpus(struct vm *vm);
306 cpuset_t vm_start_cpus(struct vm *vm, const cpuset_t *tostart);
307 void vm_await_start(struct vm *vm, const cpuset_t *waiting);
308 #endif /* _SYS__CPUSET_H_ */
309
310 static __inline int
vcpu_rendezvous_pending(struct vcpu * vcpu,struct vm_eventinfo * info)311 vcpu_rendezvous_pending(struct vcpu *vcpu, struct vm_eventinfo *info)
312 {
313 /*
314 * This check isn't done with atomic operations or under a lock because
315 * there's no need to. If the vcpuid bit is set, the vcpu is part of a
316 * rendezvous and the bit won't be cleared until the vcpu enters the
317 * rendezvous. On rendezvous exit, the cpuset is cleared and the vcpu
318 * will see an empty cpuset. So, the races are harmless.
319 */
320 return (CPU_ISSET(vcpu_vcpuid(vcpu), info->rptr));
321 }
322
323 static __inline int
vcpu_suspended(struct vm_eventinfo * info)324 vcpu_suspended(struct vm_eventinfo *info)
325 {
326
327 return (*info->sptr);
328 }
329
330 static __inline int
vcpu_reqidle(struct vm_eventinfo * info)331 vcpu_reqidle(struct vm_eventinfo *info)
332 {
333
334 return (*info->iptr);
335 }
336
337 int vcpu_debugged(struct vcpu *vcpu);
338
339 /*
340 * Return true if device indicated by bus/slot/func is supposed to be a
341 * pci passthrough device.
342 *
343 * Return false otherwise.
344 */
345 bool vmm_is_pptdev(int bus, int slot, int func);
346
347 void *vm_iommu_domain(struct vm *vm);
348
349 enum vcpu_state {
350 VCPU_IDLE,
351 VCPU_FROZEN,
352 VCPU_RUNNING,
353 VCPU_SLEEPING,
354 };
355
356 int vcpu_set_state(struct vcpu *vcpu, enum vcpu_state state, bool from_idle);
357 enum vcpu_state vcpu_get_state(struct vcpu *vcpu, int *hostcpu);
358
359 static int __inline
vcpu_is_running(struct vcpu * vcpu,int * hostcpu)360 vcpu_is_running(struct vcpu *vcpu, int *hostcpu)
361 {
362 return (vcpu_get_state(vcpu, hostcpu) == VCPU_RUNNING);
363 }
364
365 #ifdef _SYS_PROC_H_
366 static int __inline
vcpu_should_yield(struct vcpu * vcpu)367 vcpu_should_yield(struct vcpu *vcpu)
368 {
369 struct thread *td;
370
371 td = curthread;
372 return (td->td_ast != 0 || td->td_owepreempt != 0);
373 }
374 #endif
375
376 void *vcpu_stats(struct vcpu *vcpu);
377 void vcpu_notify_event(struct vcpu *vcpu, bool lapic_intr);
378 struct vmspace *vm_vmspace(struct vm *vm);
379 struct vm_mem *vm_mem(struct vm *vm);
380 struct vatpic *vm_atpic(struct vm *vm);
381 struct vatpit *vm_atpit(struct vm *vm);
382 struct vpmtmr *vm_pmtmr(struct vm *vm);
383 struct vrtc *vm_rtc(struct vm *vm);
384
385 /*
386 * Inject exception 'vector' into the guest vcpu. This function returns 0 on
387 * success and non-zero on failure.
388 *
389 * Wrapper functions like 'vm_inject_gp()' should be preferred to calling
390 * this function directly because they enforce the trap-like or fault-like
391 * behavior of an exception.
392 *
393 * This function should only be called in the context of the thread that is
394 * executing this vcpu.
395 */
396 int vm_inject_exception(struct vcpu *vcpu, int vector, int err_valid,
397 uint32_t errcode, int restart_instruction);
398
399 /*
400 * This function is called after a VM-exit that occurred during exception or
401 * interrupt delivery through the IDT. The format of 'intinfo' is described
402 * in Figure 15-1, "EXITINTINFO for All Intercepts", APM, Vol 2.
403 *
404 * If a VM-exit handler completes the event delivery successfully then it
405 * should call vm_exit_intinfo() to extinguish the pending event. For e.g.,
406 * if the task switch emulation is triggered via a task gate then it should
407 * call this function with 'intinfo=0' to indicate that the external event
408 * is not pending anymore.
409 *
410 * Return value is 0 on success and non-zero on failure.
411 */
412 int vm_exit_intinfo(struct vcpu *vcpu, uint64_t intinfo);
413
414 /*
415 * This function is called before every VM-entry to retrieve a pending
416 * event that should be injected into the guest. This function combines
417 * nested events into a double or triple fault.
418 *
419 * Returns 0 if there are no events that need to be injected into the guest
420 * and non-zero otherwise.
421 */
422 int vm_entry_intinfo(struct vcpu *vcpu, uint64_t *info);
423
424 int vm_get_intinfo(struct vcpu *vcpu, uint64_t *info1, uint64_t *info2);
425
426 /*
427 * Function used to keep track of the guest's TSC offset. The
428 * offset is used by the virtualization extensions to provide a consistent
429 * value for the Time Stamp Counter to the guest.
430 */
431 void vm_set_tsc_offset(struct vcpu *vcpu, uint64_t offset);
432
433 enum vm_reg_name vm_segment_name(int seg_encoding);
434
435 struct vm_copyinfo {
436 uint64_t gpa;
437 size_t len;
438 void *hva;
439 void *cookie;
440 };
441
442 /*
443 * Set up 'copyinfo[]' to copy to/from guest linear address space starting
444 * at 'gla' and 'len' bytes long. The 'prot' should be set to PROT_READ for
445 * a copyin or PROT_WRITE for a copyout.
446 *
447 * retval is_fault Interpretation
448 * 0 0 Success
449 * 0 1 An exception was injected into the guest
450 * EFAULT N/A Unrecoverable error
451 *
452 * The 'copyinfo[]' can be passed to 'vm_copyin()' or 'vm_copyout()' only if
453 * the return value is 0. The 'copyinfo[]' resources should be freed by calling
454 * 'vm_copy_teardown()' after the copy is done.
455 */
456 int vm_copy_setup(struct vcpu *vcpu, struct vm_guest_paging *paging,
457 uint64_t gla, size_t len, int prot, struct vm_copyinfo *copyinfo,
458 int num_copyinfo, int *is_fault);
459 void vm_copy_teardown(struct vm_copyinfo *copyinfo, int num_copyinfo);
460 void vm_copyin(struct vm_copyinfo *copyinfo, void *kaddr, size_t len);
461 void vm_copyout(const void *kaddr, struct vm_copyinfo *copyinfo, size_t len);
462
463 int vcpu_trace_exceptions(struct vcpu *vcpu);
464 int vcpu_trap_wbinvd(struct vcpu *vcpu);
465 #endif /* KERNEL */
466
467 /*
468 * Identifiers for optional vmm capabilities
469 */
470 enum vm_cap_type {
471 VM_CAP_HALT_EXIT,
472 VM_CAP_MTRAP_EXIT,
473 VM_CAP_PAUSE_EXIT,
474 VM_CAP_UNRESTRICTED_GUEST,
475 VM_CAP_ENABLE_INVPCID,
476 VM_CAP_BPT_EXIT,
477 VM_CAP_RDPID,
478 VM_CAP_RDTSCP,
479 VM_CAP_IPI_EXIT,
480 VM_CAP_MASK_HWINTR,
481 VM_CAP_RFLAGS_TF,
482 VM_CAP_MAX
483 };
484
485 enum vm_intr_trigger {
486 EDGE_TRIGGER,
487 LEVEL_TRIGGER
488 };
489
490 /*
491 * The 'access' field has the format specified in Table 21-2 of the Intel
492 * Architecture Manual vol 3b.
493 *
494 * XXX The contents of the 'access' field are architecturally defined except
495 * bit 16 - Segment Unusable.
496 */
497 struct seg_desc {
498 uint64_t base;
499 uint32_t limit;
500 uint32_t access;
501 };
502 #define SEG_DESC_TYPE(access) ((access) & 0x001f)
503 #define SEG_DESC_DPL(access) (((access) >> 5) & 0x3)
504 #define SEG_DESC_PRESENT(access) (((access) & 0x0080) ? 1 : 0)
505 #define SEG_DESC_DEF32(access) (((access) & 0x4000) ? 1 : 0)
506 #define SEG_DESC_GRANULARITY(access) (((access) & 0x8000) ? 1 : 0)
507 #define SEG_DESC_UNUSABLE(access) (((access) & 0x10000) ? 1 : 0)
508
509 enum vm_cpu_mode {
510 CPU_MODE_REAL,
511 CPU_MODE_PROTECTED,
512 CPU_MODE_COMPATIBILITY, /* IA-32E mode (CS.L = 0) */
513 CPU_MODE_64BIT, /* IA-32E mode (CS.L = 1) */
514 };
515
516 enum vm_paging_mode {
517 PAGING_MODE_FLAT,
518 PAGING_MODE_32,
519 PAGING_MODE_PAE,
520 PAGING_MODE_64,
521 PAGING_MODE_64_LA57,
522 };
523
524 struct vm_guest_paging {
525 uint64_t cr3;
526 int cpl;
527 enum vm_cpu_mode cpu_mode;
528 enum vm_paging_mode paging_mode;
529 };
530
531 /*
532 * The data structures 'vie' and 'vie_op' are meant to be opaque to the
533 * consumers of instruction decoding. The only reason why their contents
534 * need to be exposed is because they are part of the 'vm_exit' structure.
535 */
536 struct vie_op {
537 uint8_t op_byte; /* actual opcode byte */
538 uint8_t op_type; /* type of operation (e.g. MOV) */
539 uint16_t op_flags;
540 };
541 _Static_assert(sizeof(struct vie_op) == 4, "ABI");
542 _Static_assert(_Alignof(struct vie_op) == 2, "ABI");
543
544 #define VIE_INST_SIZE 15
545 struct vie {
546 uint8_t inst[VIE_INST_SIZE]; /* instruction bytes */
547 uint8_t num_valid; /* size of the instruction */
548
549 /* The following fields are all zeroed upon restart. */
550 #define vie_startzero num_processed
551 uint8_t num_processed;
552
553 uint8_t addrsize:4, opsize:4; /* address and operand sizes */
554 uint8_t rex_w:1, /* REX prefix */
555 rex_r:1,
556 rex_x:1,
557 rex_b:1,
558 rex_present:1,
559 repz_present:1, /* REP/REPE/REPZ prefix */
560 repnz_present:1, /* REPNE/REPNZ prefix */
561 opsize_override:1, /* Operand size override */
562 addrsize_override:1, /* Address size override */
563 segment_override:1; /* Segment override */
564
565 uint8_t mod:2, /* ModRM byte */
566 reg:4,
567 rm:4;
568
569 uint8_t ss:2, /* SIB byte */
570 vex_present:1, /* VEX prefixed */
571 vex_l:1, /* L bit */
572 index:4, /* SIB byte */
573 base:4; /* SIB byte */
574
575 uint8_t disp_bytes;
576 uint8_t imm_bytes;
577
578 uint8_t scale;
579
580 uint8_t vex_reg:4, /* vvvv: first source register specifier */
581 vex_pp:2, /* pp */
582 _sparebits:2;
583
584 uint8_t _sparebytes[2];
585
586 int base_register; /* VM_REG_GUEST_xyz */
587 int index_register; /* VM_REG_GUEST_xyz */
588 int segment_register; /* VM_REG_GUEST_xyz */
589
590 int64_t displacement; /* optional addr displacement */
591 int64_t immediate; /* optional immediate operand */
592
593 uint8_t decoded; /* set to 1 if successfully decoded */
594
595 uint8_t _sparebyte;
596
597 struct vie_op op; /* opcode description */
598 };
599 _Static_assert(sizeof(struct vie) == 64, "ABI");
600 _Static_assert(__offsetof(struct vie, disp_bytes) == 22, "ABI");
601 _Static_assert(__offsetof(struct vie, scale) == 24, "ABI");
602 _Static_assert(__offsetof(struct vie, base_register) == 28, "ABI");
603
604 enum vm_exitcode {
605 VM_EXITCODE_INOUT,
606 VM_EXITCODE_VMX,
607 VM_EXITCODE_BOGUS,
608 VM_EXITCODE_RDMSR,
609 VM_EXITCODE_WRMSR,
610 VM_EXITCODE_HLT,
611 VM_EXITCODE_MTRAP,
612 VM_EXITCODE_PAUSE,
613 VM_EXITCODE_PAGING,
614 VM_EXITCODE_INST_EMUL,
615 VM_EXITCODE_SPINUP_AP,
616 VM_EXITCODE_DEPRECATED1, /* used to be SPINDOWN_CPU */
617 VM_EXITCODE_RENDEZVOUS,
618 VM_EXITCODE_IOAPIC_EOI,
619 VM_EXITCODE_SUSPENDED,
620 VM_EXITCODE_INOUT_STR,
621 VM_EXITCODE_TASK_SWITCH,
622 VM_EXITCODE_MONITOR,
623 VM_EXITCODE_MWAIT,
624 VM_EXITCODE_SVM,
625 VM_EXITCODE_REQIDLE,
626 VM_EXITCODE_DEBUG,
627 VM_EXITCODE_VMINSN,
628 VM_EXITCODE_BPT,
629 VM_EXITCODE_IPI,
630 VM_EXITCODE_DB,
631 VM_EXITCODE_MAX
632 };
633
634 struct vm_inout {
635 uint16_t bytes:3; /* 1 or 2 or 4 */
636 uint16_t in:1;
637 uint16_t string:1;
638 uint16_t rep:1;
639 uint16_t port;
640 uint32_t eax; /* valid for out */
641 };
642
643 struct vm_inout_str {
644 struct vm_inout inout; /* must be the first element */
645 struct vm_guest_paging paging;
646 uint64_t rflags;
647 uint64_t cr0;
648 uint64_t index;
649 uint64_t count; /* rep=1 (%rcx), rep=0 (1) */
650 int addrsize;
651 enum vm_reg_name seg_name;
652 struct seg_desc seg_desc;
653 int cs_d;
654 uint64_t cs_base;
655 };
656
657 enum task_switch_reason {
658 TSR_CALL,
659 TSR_IRET,
660 TSR_JMP,
661 TSR_IDT_GATE, /* task gate in IDT */
662 };
663
664 struct vm_task_switch {
665 uint16_t tsssel; /* new TSS selector */
666 int ext; /* task switch due to external event */
667 uint32_t errcode;
668 int errcode_valid; /* push 'errcode' on the new stack */
669 enum task_switch_reason reason;
670 struct vm_guest_paging paging;
671 };
672
673 struct vm_exit {
674 enum vm_exitcode exitcode;
675 int inst_length; /* 0 means unknown */
676 uint64_t rip;
677 union {
678 struct vm_inout inout;
679 struct vm_inout_str inout_str;
680 struct {
681 uint64_t gpa;
682 int fault_type;
683 } paging;
684 struct {
685 uint64_t gpa;
686 uint64_t gla;
687 uint64_t cs_base;
688 int cs_d; /* CS.D */
689 struct vm_guest_paging paging;
690 struct vie vie;
691 } inst_emul;
692 /*
693 * VMX specific payload. Used when there is no "better"
694 * exitcode to represent the VM-exit.
695 */
696 struct {
697 int status; /* vmx inst status */
698 /*
699 * 'exit_reason' and 'exit_qualification' are valid
700 * only if 'status' is zero.
701 */
702 uint32_t exit_reason;
703 uint64_t exit_qualification;
704 /*
705 * 'inst_error' and 'inst_type' are valid
706 * only if 'status' is non-zero.
707 */
708 int inst_type;
709 int inst_error;
710 } vmx;
711 /*
712 * SVM specific payload.
713 */
714 struct {
715 uint64_t exitcode;
716 uint64_t exitinfo1;
717 uint64_t exitinfo2;
718 } svm;
719 struct {
720 int inst_length;
721 } bpt;
722 struct {
723 int trace_trap;
724 int pushf_intercept;
725 int tf_shadow_val;
726 struct vm_guest_paging paging;
727 } dbg;
728 struct {
729 uint32_t code; /* ecx value */
730 uint64_t wval;
731 } msr;
732 struct {
733 int vcpu;
734 uint64_t rip;
735 } spinup_ap;
736 struct {
737 uint64_t rflags;
738 uint64_t intr_status;
739 } hlt;
740 struct {
741 int vector;
742 } ioapic_eoi;
743 struct {
744 enum vm_suspend_how how;
745 } suspended;
746 struct {
747 /*
748 * The destination vCPU mask is saved in vcpu->cpuset
749 * and is copied out to userspace separately to avoid
750 * ABI concerns.
751 */
752 uint32_t mode;
753 uint8_t vector;
754 } ipi;
755 struct vm_task_switch task_switch;
756 } u;
757 };
758
759 /* APIs to inject faults into the guest */
760 void vm_inject_fault(struct vcpu *vcpu, int vector, int errcode_valid,
761 int errcode);
762
763 static __inline void
vm_inject_ud(struct vcpu * vcpu)764 vm_inject_ud(struct vcpu *vcpu)
765 {
766 vm_inject_fault(vcpu, IDT_UD, 0, 0);
767 }
768
769 static __inline void
vm_inject_gp(struct vcpu * vcpu)770 vm_inject_gp(struct vcpu *vcpu)
771 {
772 vm_inject_fault(vcpu, IDT_GP, 1, 0);
773 }
774
775 static __inline void
vm_inject_ac(struct vcpu * vcpu,int errcode)776 vm_inject_ac(struct vcpu *vcpu, int errcode)
777 {
778 vm_inject_fault(vcpu, IDT_AC, 1, errcode);
779 }
780
781 static __inline void
vm_inject_ss(struct vcpu * vcpu,int errcode)782 vm_inject_ss(struct vcpu *vcpu, int errcode)
783 {
784 vm_inject_fault(vcpu, IDT_SS, 1, errcode);
785 }
786
787 void vm_inject_pf(struct vcpu *vcpu, int error_code, uint64_t cr2);
788
789 #endif /* _VMM_H_ */
790