1/*-
2 * Copyright (c) 2013, Anish Gupta (akgupt3@gmail.com)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: projects/bhyve_svm/sys/amd64/vmm/amd/svm.c 271912 2014-09-20 21:46:31Z neel $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/smp.h>
33#include <sys/kernel.h>
34#include <sys/malloc.h>
35#include <sys/pcpu.h>
36#include <sys/proc.h>
37#include <sys/sysctl.h>
38
39#include <vm/vm.h>
40#include <vm/pmap.h>
41
42#include <machine/cpufunc.h>
43#include <machine/psl.h>
44#include <machine/pmap.h>
45#include <machine/md_var.h>
46#include <machine/vmparam.h>
47#include <machine/specialreg.h>
48#include <machine/segments.h>
49#include <machine/smp.h>
50#include <machine/vmm.h>
51#include <machine/vmm_dev.h>
52#include <machine/vmm_instruction_emul.h>
53
54#include <x86/apicreg.h>
55
56#include "vmm_lapic.h"
57#include "vmm_stat.h"
58#include "vmm_ktr.h"
59#include "vmm_ioport.h"
60#include "vatpic.h"
61#include "vlapic.h"
62#include "vlapic_priv.h"
63
64#include "x86.h"
65#include "vmcb.h"
66#include "svm.h"
67#include "svm_softc.h"
68#include "svm_msr.h"
69#include "npt.h"
70
71SYSCTL_DECL(_hw_vmm);
72SYSCTL_NODE(_hw_vmm, OID_AUTO, svm, CTLFLAG_RW, NULL, NULL);
73
74/*
75 * SVM CPUID function 0x8000_000A, edx bit decoding.
76 */
77#define AMD_CPUID_SVM_NP BIT(0) /* Nested paging or RVI */
78#define AMD_CPUID_SVM_LBR BIT(1) /* Last branch virtualization */
79#define AMD_CPUID_SVM_SVML BIT(2) /* SVM lock */
80#define AMD_CPUID_SVM_NRIP_SAVE BIT(3) /* Next RIP is saved */
81#define AMD_CPUID_SVM_TSC_RATE BIT(4) /* TSC rate control. */
82#define AMD_CPUID_SVM_VMCB_CLEAN BIT(5) /* VMCB state caching */
83#define AMD_CPUID_SVM_FLUSH_BY_ASID BIT(6) /* Flush by ASID */
84#define AMD_CPUID_SVM_DECODE_ASSIST BIT(7) /* Decode assist */
85#define AMD_CPUID_SVM_PAUSE_INC BIT(10) /* Pause intercept filter. */
86#define AMD_CPUID_SVM_PAUSE_FTH BIT(12) /* Pause filter threshold */
87
88#define VMCB_CACHE_DEFAULT (VMCB_CACHE_ASID | \
89 VMCB_CACHE_IOPM | \
90 VMCB_CACHE_I | \
91 VMCB_CACHE_TPR | \
92 VMCB_CACHE_NP)
93
94MALLOC_DEFINE(M_SVM, "svm", "svm");
95MALLOC_DEFINE(M_SVM_VLAPIC, "svm-vlapic", "svm-vlapic");
96
97/* Per-CPU context area. */
98extern struct pcpu __pcpu[];
99
100static int svm_getdesc(void *arg, int vcpu, int type, struct seg_desc *desc);
101
102static uint32_t svm_feature; /* AMD SVM features. */
103SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, features, CTLFLAG_RD, &svm_feature, 0,
104 "SVM features advertised by CPUID.8000000AH:EDX");
105
106static int disable_npf_assist;
107SYSCTL_INT(_hw_vmm_svm, OID_AUTO, disable_npf_assist, CTLFLAG_RWTUN,
108 &disable_npf_assist, 0, NULL);
109
110/* Maximum ASIDs supported by the processor */
111static uint32_t nasid;
112SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, num_asids, CTLFLAG_RD, &nasid, 0,
113 "Number of ASIDs supported by this processor");
114
115/* Current ASID generation for each host cpu */
116static struct asid asid[MAXCPU];
117
118/*
119 * SVM host state saved area of size 4KB for each core.
120 */
121static uint8_t hsave[MAXCPU][PAGE_SIZE] __aligned(PAGE_SIZE);
122
123/*
124 * S/w saved host context.
125 */
126static struct svm_regctx host_ctx[MAXCPU];
127
128static VMM_STAT_AMD(VCPU_EXITINTINFO, "VM exits during event delivery");
129static VMM_STAT_AMD(VCPU_INTINFO_INJECTED, "Events pending at VM entry");
130static VMM_STAT_AMD(VMEXIT_VINTR, "VM exits due to interrupt window");
131
132/*
133 * Common function to enable or disabled SVM for a CPU.
134 */
135static int
136cpu_svm_enable_disable(boolean_t enable)
137{
138 uint64_t efer_msr;
139
140 efer_msr = rdmsr(MSR_EFER);
141
142 if (enable)
143 efer_msr |= EFER_SVM;
144 else
145 efer_msr &= ~EFER_SVM;
146
147 wrmsr(MSR_EFER, efer_msr);
148
149 return(0);
150}
151
152/*
153 * Disable SVM on a CPU.
154 */
155static void
156svm_disable(void *arg __unused)
157{
158
159 (void)cpu_svm_enable_disable(FALSE);
160}
161
162/*
163 * Disable SVM for all CPUs.
164 */
165static int
166svm_cleanup(void)
167{
168
169 smp_rendezvous(NULL, svm_disable, NULL, NULL);
170 return (0);
171}
172
173/*
174 * Check for required BHyVe SVM features in a CPU.
175 */
176static int
177svm_cpuid_features(void)
178{
179 u_int regs[4];
180
181 /* CPUID Fn8000_000A is for SVM */
182 do_cpuid(0x8000000A, regs);
183 svm_feature = regs[3];
184
185 printf("SVM rev: 0x%x NASID:0x%x\n", regs[0] & 0xFF, regs[1]);
186 nasid = regs[1];
187 KASSERT(nasid > 1, ("Insufficient ASIDs for guests: %#x", nasid));
188
189 printf("SVM Features:0x%b\n", svm_feature,
190 "\020"
191 "\001NP" /* Nested paging */
192 "\002LbrVirt" /* LBR virtualization */
193 "\003SVML" /* SVM lock */
194 "\004NRIPS" /* NRIP save */
195 "\005TscRateMsr" /* MSR based TSC rate control */
196 "\006VmcbClean" /* VMCB clean bits */
197 "\007FlushByAsid" /* Flush by ASID */
198 "\010DecodeAssist" /* Decode assist */
199 "\011<b20>"
200 "\012<b20>"
201 "\013PauseFilter"
202 "\014<b20>"
203 "\015PauseFilterThreshold"
204 "\016AVIC"
205 );
206
207 /* SVM Lock */
208 if (!(svm_feature & AMD_CPUID_SVM_SVML)) {
209 printf("SVM is disabled by BIOS, please enable in BIOS.\n");
210 return (ENXIO);
211 }
212
213 /*
214 * bhyve need RVI to work.
215 */
216 if (!(svm_feature & AMD_CPUID_SVM_NP)) {
217 printf("Missing Nested paging or RVI SVM support in processor.\n");
218 return (EIO);
219 }
220
221 if (svm_feature & AMD_CPUID_SVM_NRIP_SAVE)
222 return (0);
223
224 return (EIO);
225}
226
227static __inline int
228flush_by_asid(void)
229{
230
231 return (svm_feature & AMD_CPUID_SVM_FLUSH_BY_ASID);
232}
233
234static __inline int
235decode_assist(void)
236{
237
238 return (svm_feature & AMD_CPUID_SVM_DECODE_ASSIST);
239}
240
241/*
242 * Enable SVM for a CPU.
243 */
244static void
245svm_enable(void *arg __unused)
246{
247 uint64_t hsave_pa;
248
249 (void)cpu_svm_enable_disable(TRUE);
250
251 hsave_pa = vtophys(hsave[curcpu]);
252 wrmsr(MSR_VM_HSAVE_PA, hsave_pa);
253
254 if (rdmsr(MSR_VM_HSAVE_PA) != hsave_pa) {
255 panic("VM_HSAVE_PA is wrong on CPU%d\n", curcpu);
256 }
257}
258
259/*
260 * Check if a processor support SVM.
261 */
262static int
263is_svm_enabled(void)
264{
265 uint64_t msr;
266
267 /* Section 15.4 Enabling SVM from APM2. */
268 if ((amd_feature2 & AMDID2_SVM) == 0) {
269 printf("SVM is not supported on this processor.\n");
270 return (ENXIO);
271 }
272
273 msr = rdmsr(MSR_VM_CR);
274 /* Make sure SVM is not disabled by BIOS. */
275 if ((msr & VM_CR_SVMDIS) == 0) {
276 return svm_cpuid_features();
277 }
278
279 printf("SVM disabled by Key, consult TPM/BIOS manual.\n");
280 return (ENXIO);
281}
282
283/*
284 * Enable SVM on CPU and initialize nested page table h/w.
285 */
286static int
287svm_init(int ipinum)
288{
289 int err, cpu;
290
291 err = is_svm_enabled();
292 if (err)
293 return (err);
294
295 for (cpu = 0; cpu < MAXCPU; cpu++) {
296 /*
297 * Initialize the host ASIDs to their "highest" valid values.
298 *
299 * The next ASID allocation will rollover both 'gen' and 'num'
300 * and start off the sequence at {1,1}.
301 */
302 asid[cpu].gen = ~0UL;
303 asid[cpu].num = nasid - 1;
304 }
305
306 svm_msr_init();
307 svm_npt_init(ipinum);
308
309 /* Start SVM on all CPUs */
310 smp_rendezvous(NULL, svm_enable, NULL, NULL);
311
312 return (0);
313}
314
315static void
316svm_restore(void)
317{
318 svm_enable(NULL);
319}
320
321/*
322 * Get index and bit position for a MSR in MSR permission
323 * bitmap. Two bits are used for each MSR, lower bit is
324 * for read and higher bit is for write.
325 */
326static int
327svm_msr_index(uint64_t msr, int *index, int *bit)
328{
329 uint32_t base, off;
330
331/* Pentium compatible MSRs */
332#define MSR_PENTIUM_START 0
333#define MSR_PENTIUM_END 0x1FFF
334/* AMD 6th generation and Intel compatible MSRs */
335#define MSR_AMD6TH_START 0xC0000000UL
336#define MSR_AMD6TH_END 0xC0001FFFUL
337/* AMD 7th and 8th generation compatible MSRs */
338#define MSR_AMD7TH_START 0xC0010000UL
339#define MSR_AMD7TH_END 0xC0011FFFUL
340
341 *index = -1;
342 *bit = (msr % 4) * 2;
343 base = 0;
344
345 if (msr >= MSR_PENTIUM_START && msr <= MSR_PENTIUM_END) {
346 *index = msr / 4;
347 return (0);
348 }
349
350 base += (MSR_PENTIUM_END - MSR_PENTIUM_START + 1);
351 if (msr >= MSR_AMD6TH_START && msr <= MSR_AMD6TH_END) {
352 off = (msr - MSR_AMD6TH_START);
353 *index = (off + base) / 4;
354 return (0);
355 }
356
357 base += (MSR_AMD6TH_END - MSR_AMD6TH_START + 1);
358 if (msr >= MSR_AMD7TH_START && msr <= MSR_AMD7TH_END) {
359 off = (msr - MSR_AMD7TH_START);
360 *index = (off + base) / 4;
361 return (0);
362 }
363
364 return (EIO);
365}
366
367/*
368 * Give virtual cpu the complete access to MSR(read & write).
369 */
370static int
371svm_msr_perm(uint8_t *perm_bitmap, uint64_t msr, bool read, bool write)
372{
373 int index, bit, err;
374
375 err = svm_msr_index(msr, &index, &bit);
376 if (err) {
377 ERR("MSR 0x%lx is not writeable by guest.\n", msr);
378 return (err);
379 }
380
381 if (index < 0 || index > (SVM_MSR_BITMAP_SIZE)) {
382 ERR("MSR 0x%lx index out of range(%d).\n", msr, index);
383 return (EINVAL);
384 }
385 if (bit < 0 || bit > 8) {
386 ERR("MSR 0x%lx bit out of range(%d).\n", msr, bit);
387 return (EINVAL);
388 }
389
390 /* Disable intercept for read and write. */
391 if (read)
392 perm_bitmap[index] &= ~(1UL << bit);
393 if (write)
394 perm_bitmap[index] &= ~(2UL << bit);
395 CTR2(KTR_VMM, "Guest has control:0x%x on SVM:MSR(0x%lx).\n",
396 (perm_bitmap[index] >> bit) & 0x3, msr);
397
398 return (0);
399}
400
401static int
402svm_msr_rw_ok(uint8_t *perm_bitmap, uint64_t msr)
403{
404 return svm_msr_perm(perm_bitmap, msr, true, true);
405}
406
407static int
408svm_msr_rd_ok(uint8_t *perm_bitmap, uint64_t msr)
409{
410 return svm_msr_perm(perm_bitmap, msr, true, false);
411}
412
413static __inline void
414vcpu_set_dirty(struct svm_softc *sc, int vcpu, uint32_t dirtybits)
415{
416 struct svm_vcpu *vcpustate;
417
418 vcpustate = svm_get_vcpu(sc, vcpu);
419
420 vcpustate->dirty |= dirtybits;
421}
422
423static __inline int
424svm_get_intercept(struct svm_softc *sc, int vcpu, int idx, uint32_t bitmask)
425{
426 struct vmcb_ctrl *ctrl;
427
428 KASSERT(idx >=0 && idx < 5, ("invalid intercept index %d", idx));
429
430 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
431 return (ctrl->intercept[idx] & bitmask ? 1 : 0);
432}
433
434static __inline void
435svm_set_intercept(struct svm_softc *sc, int vcpu, int idx, uint32_t bitmask,
436 int enabled)
437{
438 struct vmcb_ctrl *ctrl;
439 uint32_t oldval;
440
441 KASSERT(idx >=0 && idx < 5, ("invalid intercept index %d", idx));
442
443 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
444 oldval = ctrl->intercept[idx];
445
446 if (enabled)
447 ctrl->intercept[idx] |= bitmask;
448 else
449 ctrl->intercept[idx] &= ~bitmask;
450
451 if (ctrl->intercept[idx] != oldval) {
452 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_I);
453 VCPU_CTR3(sc->vm, vcpu, "intercept[%d] modified "
454 "from %#x to %#x", idx, oldval, ctrl->intercept[idx]);
455 }
456}
457
458static __inline void
459svm_disable_intercept(struct svm_softc *sc, int vcpu, int off, uint32_t bitmask)
460{
461 svm_set_intercept(sc, vcpu, off, bitmask, 0);
462}
463
464static __inline void
465svm_enable_intercept(struct svm_softc *sc, int vcpu, int off, uint32_t bitmask)
466{
467 svm_set_intercept(sc, vcpu, off, bitmask, 1);
468}
469
470static void
471vmcb_init(struct svm_softc *sc, int vcpu, uint64_t iopm_base_pa,
472 uint64_t msrpm_base_pa, uint64_t np_pml4)
473{
474 struct vmcb_ctrl *ctrl;
475 struct vmcb_state *state;
476 uint32_t mask;
477 int n;
478
479 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
480 state = svm_get_vmcb_state(sc, vcpu);
481
482 ctrl->iopm_base_pa = iopm_base_pa;
483 ctrl->msrpm_base_pa = msrpm_base_pa;
484
485 /* Enable nested paging */
486 ctrl->np_enable = 1;
487 ctrl->n_cr3 = np_pml4;
488
489 /*
490 * Intercept accesses to the control registers that are not shadowed
491 * in the VMCB - i.e. all except cr0, cr2, cr3, cr4 and cr8.
492 */
493 for (n = 0; n < 16; n++) {
494 mask = (BIT(n) << 16) | BIT(n);
495 if (n == 0 || n == 2 || n == 3 || n == 4 || n == 8)
496 svm_disable_intercept(sc, vcpu, VMCB_CR_INTCPT, mask);
497 else
498 svm_enable_intercept(sc, vcpu, VMCB_CR_INTCPT, mask);
499 }
500
501 /* Intercept Machine Check exceptions. */
502 svm_enable_intercept(sc, vcpu, VMCB_EXC_INTCPT, BIT(IDT_MC));
503
504 /* Intercept various events (for e.g. I/O, MSR and CPUID accesses) */
505 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_IO);
506 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_MSR);
507 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_CPUID);
508 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_INTR);
509 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_INIT);
510 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_NMI);
511 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_SMI);
512 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_SHUTDOWN);
513 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
514 VMCB_INTCPT_FERR_FREEZE);
515
516 /*
517 * From section "Canonicalization and Consistency Checks" in APMv2
518 * the VMRUN intercept bit must be set to pass the consistency check.
519 */
520 svm_enable_intercept(sc, vcpu, VMCB_CTRL2_INTCPT, VMCB_INTCPT_VMRUN);
521
522 /*
523 * The ASID will be set to a non-zero value just before VMRUN.
524 */
525 ctrl->asid = 0;
526
527 /*
528 * Section 15.21.1, Interrupt Masking in EFLAGS
529 * Section 15.21.2, Virtualizing APIC.TPR
530 *
531 * This must be set for %rflag and %cr8 isolation of guest and host.
532 */
533 ctrl->v_intr_masking = 1;
534
535 /* Enable Last Branch Record aka LBR for debugging */
536 ctrl->lbr_virt_en = 1;
537 state->dbgctl = BIT(0);
538
539 /* EFER_SVM must always be set when the guest is executing */
540 state->efer = EFER_SVM;
541
542 /* Set up the PAT to power-on state */
543 state->g_pat = PAT_VALUE(0, PAT_WRITE_BACK) |
544 PAT_VALUE(1, PAT_WRITE_THROUGH) |
545 PAT_VALUE(2, PAT_UNCACHED) |
546 PAT_VALUE(3, PAT_UNCACHEABLE) |
547 PAT_VALUE(4, PAT_WRITE_BACK) |
548 PAT_VALUE(5, PAT_WRITE_THROUGH) |
549 PAT_VALUE(6, PAT_UNCACHED) |
550 PAT_VALUE(7, PAT_UNCACHEABLE);
551}
552
553/*
554 * Initialise a virtual machine.
555 */
556static void *
557svm_vminit(struct vm *vm, pmap_t pmap)
558{
559 struct svm_softc *svm_sc;
560 struct svm_vcpu *vcpu;
561 vm_paddr_t msrpm_pa, iopm_pa, pml4_pa;
562 int i;
563
564 svm_sc = (struct svm_softc *)malloc(sizeof (struct svm_softc),
565 M_SVM, M_WAITOK | M_ZERO);
566
567 svm_sc->vm = vm;
568 svm_sc->nptp = (vm_offset_t)vtophys(pmap->pm_pml4);
569
570 /*
571 * Intercept MSR access to all MSRs except GSBASE, FSBASE,... etc.
572 */
573 memset(svm_sc->msr_bitmap, 0xFF, sizeof(svm_sc->msr_bitmap));
574
575 /*
576 * Following MSR can be completely controlled by virtual machines
577 * since access to following are translated to access to VMCB.
578 */
579 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_GSBASE);
580 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_FSBASE);
581 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_KGSBASE);
582
583 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_STAR);
584 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_LSTAR);
585 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_CSTAR);
586 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SF_MASK);
587 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SYSENTER_CS_MSR);
588 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SYSENTER_ESP_MSR);
589 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SYSENTER_EIP_MSR);
590
591 /* For Nested Paging/RVI only. */
592 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_PAT);
593
594 svm_msr_rd_ok(svm_sc->msr_bitmap, MSR_TSC);
595 svm_msr_rd_ok(svm_sc->msr_bitmap, MSR_EFER);
596
597 /* Intercept access to all I/O ports. */
598 memset(svm_sc->iopm_bitmap, 0xFF, sizeof(svm_sc->iopm_bitmap));
599
600 /* Cache physical address for multiple vcpus. */
601 iopm_pa = vtophys(svm_sc->iopm_bitmap);
602 msrpm_pa = vtophys(svm_sc->msr_bitmap);
603 pml4_pa = svm_sc->nptp;
604
605 for (i = 0; i < VM_MAXCPU; i++) {
606 vcpu = svm_get_vcpu(svm_sc, i);
607 vcpu->lastcpu = NOCPU;
608 vcpu->vmcb_pa = vtophys(&vcpu->vmcb);
609 vmcb_init(svm_sc, i, iopm_pa, msrpm_pa, pml4_pa);
610 svm_msr_guest_init(svm_sc, i);
611 }
612 return (svm_sc);
613}
614
615static int
616svm_cpl(struct vmcb_state *state)
617{
618
619 /*
620 * From APMv2:
621 * "Retrieve the CPL from the CPL field in the VMCB, not
622 * from any segment DPL"
623 */
624 return (state->cpl);
625}
626
627static enum vm_cpu_mode
628svm_vcpu_mode(struct vmcb *vmcb)
629{
630 struct vmcb_segment *seg;
631 struct vmcb_state *state;
632
633 state = &vmcb->state;
634
635 if (state->efer & EFER_LMA) {
636 seg = vmcb_seg(vmcb, VM_REG_GUEST_CS);
637 /*
638 * Section 4.8.1 for APM2, check if Code Segment has
639 * Long attribute set in descriptor.
640 */
641 if (seg->attrib & VMCB_CS_ATTRIB_L)
642 return (CPU_MODE_64BIT);
643 else
644 return (CPU_MODE_COMPATIBILITY);
645 } else if (state->cr0 & CR0_PE) {
646 return (CPU_MODE_PROTECTED);
647 } else {
648 return (CPU_MODE_REAL);
649 }
650}
651
652static enum vm_paging_mode
653svm_paging_mode(uint64_t cr0, uint64_t cr4, uint64_t efer)
654{
655
656 if ((cr0 & CR0_PG) == 0)
657 return (PAGING_MODE_FLAT);
658 if ((cr4 & CR4_PAE) == 0)
659 return (PAGING_MODE_32);
660 if (efer & EFER_LME)
661 return (PAGING_MODE_64);
662 else
663 return (PAGING_MODE_PAE);
664}
665
666/*
667 * ins/outs utility routines
668 */
669static uint64_t
670svm_inout_str_index(struct svm_regctx *regs, int in)
671{
672 uint64_t val;
673
674 val = in ? regs->e.g.sctx_rdi : regs->e.g.sctx_rsi;
675
676 return (val);
677}
678
679static uint64_t
680svm_inout_str_count(struct svm_regctx *regs, int rep)
681{
682 uint64_t val;
683
684 val = rep ? regs->sctx_rcx : 1;
685
686 return (val);
687}
688
689static void
690svm_inout_str_seginfo(struct svm_softc *svm_sc, int vcpu, int64_t info1,
691 int in, struct vm_inout_str *vis)
692{
693 int error, s;
694
695 if (in) {
696 vis->seg_name = VM_REG_GUEST_ES;
697 } else {
698 /* The segment field has standard encoding */
699 s = (info1 >> 10) & 0x7;
700 vis->seg_name = vm_segment_name(s);
701 }
702
703 error = svm_getdesc(svm_sc, vcpu, vis->seg_name, &vis->seg_desc);
704 KASSERT(error == 0, ("%s: svm_getdesc error %d", __func__, error));
705}
706
707static int
708svm_inout_str_addrsize(uint64_t info1)
709{
710 uint32_t size;
711
712 size = (info1 >> 7) & 0x7;
713 switch (size) {
714 case 1:
715 return (2); /* 16 bit */
716 case 2:
717 return (4); /* 32 bit */
718 case 4:
719 return (8); /* 64 bit */
720 default:
721 panic("%s: invalid size encoding %d", __func__, size);
722 }
723}
724
725static void
726svm_paging_info(struct vmcb *vmcb, struct vm_guest_paging *paging)
727{
728 struct vmcb_state *state;
729
730 state = &vmcb->state;
731 paging->cr3 = state->cr3;
732 paging->cpl = svm_cpl(state);
733 paging->cpu_mode = svm_vcpu_mode(vmcb);
734 paging->paging_mode = svm_paging_mode(state->cr0, state->cr4,
735 state->efer);
736}
737
738#define UNHANDLED 0
739
740/*
741 * Handle guest I/O intercept.
742 */
743static int
744svm_handle_io(struct svm_softc *svm_sc, int vcpu, struct vm_exit *vmexit)
745{
746 struct vmcb_ctrl *ctrl;
747 struct vmcb_state *state;
748 struct svm_regctx *regs;
749 struct vm_inout_str *vis;
750 uint64_t info1;
751 int inout_string;
752
753 state = svm_get_vmcb_state(svm_sc, vcpu);
754 ctrl = svm_get_vmcb_ctrl(svm_sc, vcpu);
755 regs = svm_get_guest_regctx(svm_sc, vcpu);
756
757 info1 = ctrl->exitinfo1;
758 inout_string = info1 & BIT(2) ? 1 : 0;
759
760 /*
761 * The effective segment number in EXITINFO1[12:10] is populated
762 * only if the processor has the DecodeAssist capability.
763 *
764 * XXX this is not specified explicitly in APMv2 but can be verified
765 * empirically.
766 */
767 if (inout_string && !decode_assist())
768 return (UNHANDLED);
769
770 vmexit->exitcode = VM_EXITCODE_INOUT;
771 vmexit->u.inout.in = (info1 & BIT(0)) ? 1 : 0;
772 vmexit->u.inout.string = inout_string;
773 vmexit->u.inout.rep = (info1 & BIT(3)) ? 1 : 0;
774 vmexit->u.inout.bytes = (info1 >> 4) & 0x7;
775 vmexit->u.inout.port = (uint16_t)(info1 >> 16);
776 vmexit->u.inout.eax = (uint32_t)(state->rax);
777
778 if (inout_string) {
779 vmexit->exitcode = VM_EXITCODE_INOUT_STR;
780 vis = &vmexit->u.inout_str;
781 svm_paging_info(svm_get_vmcb(svm_sc, vcpu), &vis->paging);
782 vis->rflags = state->rflags;
783 vis->cr0 = state->cr0;
784 vis->index = svm_inout_str_index(regs, vmexit->u.inout.in);
785 vis->count = svm_inout_str_count(regs, vmexit->u.inout.rep);
786 vis->addrsize = svm_inout_str_addrsize(info1);
787 svm_inout_str_seginfo(svm_sc, vcpu, info1,
788 vmexit->u.inout.in, vis);
789 }
790
791 return (UNHANDLED);
792}
793
794static int
795svm_npf_paging(uint64_t exitinfo1)
796{
797
798 if (exitinfo1 & VMCB_NPF_INFO1_W)
799 return (VM_PROT_WRITE);
800
801 return (VM_PROT_READ);
802}
803
804static bool
805svm_npf_emul_fault(uint64_t exitinfo1)
806{
807
808 if (exitinfo1 & VMCB_NPF_INFO1_ID) {
809 return (false);
810 }
811
812 if (exitinfo1 & VMCB_NPF_INFO1_GPT) {
813 return (false);
814 }
815
816 if ((exitinfo1 & VMCB_NPF_INFO1_GPA) == 0) {
817 return (false);
818 }
819
820 return (true);
821}
822
823static void
824svm_handle_inst_emul(struct vmcb *vmcb, uint64_t gpa, struct vm_exit *vmexit)
825{
826 struct vm_guest_paging *paging;
827 struct vmcb_segment *seg;
828 struct vmcb_ctrl *ctrl;
829 char *inst_bytes;
830 int inst_len;
831
832 ctrl = &vmcb->ctrl;
833 paging = &vmexit->u.inst_emul.paging;
834
835 vmexit->exitcode = VM_EXITCODE_INST_EMUL;
836 vmexit->u.inst_emul.gpa = gpa;
837 vmexit->u.inst_emul.gla = VIE_INVALID_GLA;
838 svm_paging_info(vmcb, paging);
839
840 seg = vmcb_seg(vmcb, VM_REG_GUEST_CS);
841 switch(paging->cpu_mode) {
842 case CPU_MODE_PROTECTED:
843 case CPU_MODE_COMPATIBILITY:
844 /*
845 * Section 4.8.1 of APM2, Default Operand Size or D bit.
846 */
847 vmexit->u.inst_emul.cs_d = (seg->attrib & VMCB_CS_ATTRIB_D) ?
848 1 : 0;
849 break;
850 default:
851 vmexit->u.inst_emul.cs_d = 0;
852 break;
853 }
854
855 /*
856 * Copy the instruction bytes into 'vie' if available.
857 */
858 if (decode_assist() && !disable_npf_assist) {
859 inst_len = ctrl->inst_len;
860 inst_bytes = ctrl->inst_bytes;
861 } else {
862 inst_len = 0;
863 inst_bytes = NULL;
864 }
865 vie_init(&vmexit->u.inst_emul.vie, inst_bytes, inst_len);
866}
867
868/*
869 * Intercept access to MSR_EFER to prevent the guest from clearing the
870 * SVM enable bit.
871 */
872static int
873svm_write_efer(struct svm_softc *sc, int vcpu, uint64_t val)
874{
875 struct vmcb_state *state;
876 uint64_t oldval;
877
878 state = svm_get_vmcb_state(sc, vcpu);
879
880 oldval = state->efer;
881 state->efer = val | EFER_SVM;
882 if (state->efer != oldval) {
883 VCPU_CTR2(sc->vm, vcpu, "Guest EFER changed from %#lx to %#lx",
884 oldval, state->efer);
885 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_CR);
886 }
887 return (0);
888}
889
890#ifdef KTR
891static const char *
892intrtype_to_str(int intr_type)
893{
894 switch (intr_type) {
895 case VMCB_EVENTINJ_TYPE_INTR:
896 return ("hwintr");
897 case VMCB_EVENTINJ_TYPE_NMI:
898 return ("nmi");
899 case VMCB_EVENTINJ_TYPE_INTn:
900 return ("swintr");
901 case VMCB_EVENTINJ_TYPE_EXCEPTION:
902 return ("exception");
903 default:
904 panic("%s: unknown intr_type %d", __func__, intr_type);
905 }
906}
907#endif
908
909/*
910 * Inject an event to vcpu as described in section 15.20, "Event injection".
911 */
912static void
913svm_eventinject(struct svm_softc *sc, int vcpu, int intr_type, int vector,
914 uint32_t error, bool ec_valid)
915{
916 struct vmcb_ctrl *ctrl;
917
918 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
919
920 KASSERT((ctrl->eventinj & VMCB_EVENTINJ_VALID) == 0,
921 ("%s: event already pending %#lx", __func__, ctrl->eventinj));
922
923 KASSERT(vector >=0 && vector <= 255, ("%s: invalid vector %d",
924 __func__, vector));
925
926 switch (intr_type) {
927 case VMCB_EVENTINJ_TYPE_INTR:
928 case VMCB_EVENTINJ_TYPE_NMI:
929 case VMCB_EVENTINJ_TYPE_INTn:
930 break;
931 case VMCB_EVENTINJ_TYPE_EXCEPTION:
932 if (vector >= 0 && vector <= 31 && vector != 2)
933 break;
934 /* FALLTHROUGH */
935 default:
936 panic("%s: invalid intr_type/vector: %d/%d", __func__,
937 intr_type, vector);
938 }
939 ctrl->eventinj = vector | (intr_type << 8) | VMCB_EVENTINJ_VALID;
940 if (ec_valid) {
941 ctrl->eventinj |= VMCB_EVENTINJ_EC_VALID;
942 ctrl->eventinj |= (uint64_t)error << 32;
943 VCPU_CTR3(sc->vm, vcpu, "Injecting %s at vector %d errcode %#x",
944 intrtype_to_str(intr_type), vector, error);
945 } else {
946 VCPU_CTR2(sc->vm, vcpu, "Injecting %s at vector %d",
947 intrtype_to_str(intr_type), vector);
948 }
949}
950
951static void
952svm_update_virqinfo(struct svm_softc *sc, int vcpu)
953{
954 struct vm *vm;
955 struct vlapic *vlapic;
956 struct vmcb_ctrl *ctrl;
957 int pending;
958
959 vm = sc->vm;
960 vlapic = vm_lapic(vm, vcpu);
961 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
962
963 /* Update %cr8 in the emulated vlapic */
964 vlapic_set_cr8(vlapic, ctrl->v_tpr);
965
966 /*
967 * If V_IRQ indicates that the interrupt injection attempted on then
968 * last VMRUN was successful then update the vlapic accordingly.
969 */
970 if (ctrl->v_intr_vector != 0) {
971 pending = ctrl->v_irq;
972 KASSERT(ctrl->v_intr_vector >= 16, ("%s: invalid "
973 "v_intr_vector %d", __func__, ctrl->v_intr_vector));
974 KASSERT(!ctrl->v_ign_tpr, ("%s: invalid v_ign_tpr", __func__));
975 VCPU_CTR2(vm, vcpu, "v_intr_vector %d %s", ctrl->v_intr_vector,
976 pending ? "pending" : "accepted");
977 if (!pending)
978 vlapic_intr_accepted(vlapic, ctrl->v_intr_vector);
979 }
980}
981
982static void
983svm_save_intinfo(struct svm_softc *svm_sc, int vcpu)
984{
985 struct vmcb_ctrl *ctrl;
986 uint64_t intinfo;
987
988 ctrl = svm_get_vmcb_ctrl(svm_sc, vcpu);
989 intinfo = ctrl->exitintinfo;
990 if (!VMCB_EXITINTINFO_VALID(intinfo))
991 return;
992
993 /*
994 * From APMv2, Section "Intercepts during IDT interrupt delivery"
995 *
996 * If a #VMEXIT happened during event delivery then record the event
997 * that was being delivered.
998 */
999 VCPU_CTR2(svm_sc->vm, vcpu, "SVM:Pending INTINFO(0x%lx), vector=%d.\n",
1000 intinfo, VMCB_EXITINTINFO_VECTOR(intinfo));
1001 vmm_stat_incr(svm_sc->vm, vcpu, VCPU_EXITINTINFO, 1);
1002 vm_exit_intinfo(svm_sc->vm, vcpu, intinfo);
1003}
1004
1005static __inline int
1006vintr_intercept_enabled(struct svm_softc *sc, int vcpu)
1007{
1008
1009 return (svm_get_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
1010 VMCB_INTCPT_VINTR));
1011}
1012
1013static __inline void
1014enable_intr_window_exiting(struct svm_softc *sc, int vcpu)
1015{
1016 struct vmcb_ctrl *ctrl;
1017
1018 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1019
1020 if (ctrl->v_irq && ctrl->v_intr_vector == 0) {
1021 KASSERT(ctrl->v_ign_tpr, ("%s: invalid v_ign_tpr", __func__));
1022 KASSERT(vintr_intercept_enabled(sc, vcpu),
1023 ("%s: vintr intercept should be enabled", __func__));
1024 return;
1025 }
1026
1027 VCPU_CTR0(sc->vm, vcpu, "Enable intr window exiting");
1028 ctrl->v_irq = 1;
1029 ctrl->v_ign_tpr = 1;
1030 ctrl->v_intr_vector = 0;
1031 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_TPR);
1032 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_VINTR);
1033}
1034
1035static __inline void
1036disable_intr_window_exiting(struct svm_softc *sc, int vcpu)
1037{
1038 struct vmcb_ctrl *ctrl;
1039
1040 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1041
1042 if (!ctrl->v_irq && ctrl->v_intr_vector == 0) {
1043 KASSERT(!vintr_intercept_enabled(sc, vcpu),
1044 ("%s: vintr intercept should be disabled", __func__));
1045 return;
1046 }
1047
1048#ifdef KTR
1049 if (ctrl->v_intr_vector == 0)
1050 VCPU_CTR0(sc->vm, vcpu, "Disable intr window exiting");
1051 else
1052 VCPU_CTR0(sc->vm, vcpu, "Clearing V_IRQ interrupt injection");
1053#endif
1054 ctrl->v_irq = 0;
1055 ctrl->v_intr_vector = 0;
1056 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_TPR);
1057 svm_disable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_VINTR);
1058}
1059
1060static int
1061svm_modify_intr_shadow(struct svm_softc *sc, int vcpu, uint64_t val)
1062{
1063 struct vmcb_ctrl *ctrl;
1064 int oldval, newval;
1065
1066 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1067 oldval = ctrl->intr_shadow;
1068 newval = val ? 1 : 0;
1069 if (newval != oldval) {
1070 ctrl->intr_shadow = newval;
1071 VCPU_CTR1(sc->vm, vcpu, "Setting intr_shadow to %d", newval);
1072 }
1073 return (0);
1074}
1075
1076static int
1077svm_get_intr_shadow(struct svm_softc *sc, int vcpu, uint64_t *val)
1078{
1079 struct vmcb_ctrl *ctrl;
1080
1081 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1082 *val = ctrl->intr_shadow;
1083 return (0);
1084}
1085
1086/*
1087 * Once an NMI is injected it blocks delivery of further NMIs until the handler
1088 * executes an IRET. The IRET intercept is enabled when an NMI is injected to
1089 * to track when the vcpu is done handling the NMI.
1090 */
1091static int
1092nmi_blocked(struct svm_softc *sc, int vcpu)
1093{
1094 int blocked;
1095
1096 blocked = svm_get_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
1097 VMCB_INTCPT_IRET);
1098 return (blocked);
1099}
1100
1101static void
1102enable_nmi_blocking(struct svm_softc *sc, int vcpu)
1103{
1104
1105 KASSERT(!nmi_blocked(sc, vcpu), ("vNMI already blocked"));
1106 VCPU_CTR0(sc->vm, vcpu, "vNMI blocking enabled");
1107 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_IRET);
1108}
1109
1110static void
1111clear_nmi_blocking(struct svm_softc *sc, int vcpu)
1112{
1113 int error;
1114
1115 KASSERT(nmi_blocked(sc, vcpu), ("vNMI already unblocked"));
1116 VCPU_CTR0(sc->vm, vcpu, "vNMI blocking cleared");
1117 /*
1118 * When the IRET intercept is cleared the vcpu will attempt to execute
1119 * the "iret" when it runs next. However, it is possible to inject
1120 * another NMI into the vcpu before the "iret" has actually executed.
1121 *
1122 * For e.g. if the "iret" encounters a #NPF when accessing the stack
1123 * it will trap back into the hypervisor. If an NMI is pending for
1124 * the vcpu it will be injected into the guest.
1125 *
1126 * XXX this needs to be fixed
1127 */
1128 svm_disable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_IRET);
1129
1130 /*
1131 * Set 'intr_shadow' to prevent an NMI from being injected on the
1132 * immediate VMRUN.
1133 */
1134 error = svm_modify_intr_shadow(sc, vcpu, 1);
1135 KASSERT(!error, ("%s: error %d setting intr_shadow", __func__, error));
1136}
1137
1138static int
1139emulate_wrmsr(struct svm_softc *sc, int vcpu, u_int num, uint64_t val,
1140 bool *retu)
1141{
1142 int error;
1143
1144 if (lapic_msr(num))
1145 error = lapic_wrmsr(sc->vm, vcpu, num, val, retu);
1146 else if (num == MSR_EFER)
1147 error = svm_write_efer(sc, vcpu, val);
1148 else
1149 error = svm_wrmsr(sc, vcpu, num, val, retu);
1150
1151 return (error);
1152}
1153
1154static int
1155emulate_rdmsr(struct svm_softc *sc, int vcpu, u_int num, bool *retu)
1156{
1157 struct vmcb_state *state;
1158 struct svm_regctx *ctx;
1159 uint64_t result;
1160 int error;
1161
1162 if (lapic_msr(num))
1163 error = lapic_rdmsr(sc->vm, vcpu, num, &result, retu);
1164 else
1165 error = svm_rdmsr(sc, vcpu, num, &result, retu);
1166
1167 if (error == 0) {
1168 state = svm_get_vmcb_state(sc, vcpu);
1169 ctx = svm_get_guest_regctx(sc, vcpu);
1170 state->rax = result & 0xffffffff;
1171 ctx->e.g.sctx_rdx = result >> 32;
1172 }
1173
1174 return (error);
1175}
1176
1177#ifdef KTR
1178static const char *
1179exit_reason_to_str(uint64_t reason)
1180{
1181 static char reasonbuf[32];
1182
1183 switch (reason) {
1184 case VMCB_EXIT_INVALID:
1185 return ("invalvmcb");
1186 case VMCB_EXIT_SHUTDOWN:
1187 return ("shutdown");
1188 case VMCB_EXIT_NPF:
1189 return ("nptfault");
1190 case VMCB_EXIT_PAUSE:
1191 return ("pause");
1192 case VMCB_EXIT_HLT:
1193 return ("hlt");
1194 case VMCB_EXIT_CPUID:
1195 return ("cpuid");
1196 case VMCB_EXIT_IO:
1197 return ("inout");
1198 case VMCB_EXIT_MC:
1199 return ("mchk");
1200 case VMCB_EXIT_INTR:
1201 return ("extintr");
1202 case VMCB_EXIT_NMI:
1203 return ("nmi");
1204 case VMCB_EXIT_VINTR:
1205 return ("vintr");
1206 case VMCB_EXIT_MSR:
1207 return ("msr");
1208 case VMCB_EXIT_IRET:
1209 return ("iret");
1210 default:
1211 snprintf(reasonbuf, sizeof(reasonbuf), "%#lx", reason);
1212 return (reasonbuf);
1213 }
1214}
1215#endif /* KTR */
1216
1217/*
1218 * From section "State Saved on Exit" in APMv2: nRIP is saved for all #VMEXITs
1219 * that are due to instruction intercepts as well as MSR and IOIO intercepts
1220 * and exceptions caused by INT3, INTO and BOUND instructions.
1221 *
1222 * Return 1 if the nRIP is valid and 0 otherwise.
1223 */
1224static int
1225nrip_valid(uint64_t exitcode)
1226{
1227 switch (exitcode) {
1228 case 0x00 ... 0x0F: /* read of CR0 through CR15 */
1229 case 0x10 ... 0x1F: /* write of CR0 through CR15 */
1230 case 0x20 ... 0x2F: /* read of DR0 through DR15 */
1231 case 0x30 ... 0x3F: /* write of DR0 through DR15 */
1232 case 0x43: /* INT3 */
1233 case 0x44: /* INTO */
1234 case 0x45: /* BOUND */
1235 case 0x65 ... 0x7C: /* VMEXIT_CR0_SEL_WRITE ... VMEXIT_MSR */
1236 case 0x80 ... 0x8D: /* VMEXIT_VMRUN ... VMEXIT_XSETBV */
1237 return (1);
1238 default:
1239 return (0);
1240 }
1241}
1242
1243/*
1244 * Collateral for a generic SVM VM-exit.
1245 */
1246static void
1247vm_exit_svm(struct vm_exit *vme, uint64_t code, uint64_t info1, uint64_t info2)
1248{
1249
1250 vme->exitcode = VM_EXITCODE_SVM;
1251 vme->u.svm.exitcode = code;
1252 vme->u.svm.exitinfo1 = info1;
1253 vme->u.svm.exitinfo2 = info2;
1254}
1255
1256static int
1257svm_vmexit(struct svm_softc *svm_sc, int vcpu, struct vm_exit *vmexit)
1258{
1259 struct vmcb *vmcb;
1260 struct vmcb_state *state;
1261 struct vmcb_ctrl *ctrl;
1262 struct svm_regctx *ctx;
1263 uint64_t code, info1, info2, val;
1264 uint32_t eax, ecx, edx;
1265 int handled;
1266 bool retu;
1267
1268 ctx = svm_get_guest_regctx(svm_sc, vcpu);
1269 vmcb = svm_get_vmcb(svm_sc, vcpu);
1270 state = &vmcb->state;
1271 ctrl = &vmcb->ctrl;
1272
1273 handled = 0;
1274 code = ctrl->exitcode;
1275 info1 = ctrl->exitinfo1;
1276 info2 = ctrl->exitinfo2;
1277
1278 vmexit->exitcode = VM_EXITCODE_BOGUS;
1279 vmexit->rip = state->rip;
1280 vmexit->inst_length = nrip_valid(code) ? ctrl->nrip - state->rip : 0;
1281
1282 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_COUNT, 1);
1283
1284 /*
1285 * #VMEXIT(INVALID) needs to be handled early because the VMCB is
1286 * in an inconsistent state and can trigger assertions that would
1287 * never happen otherwise.
1288 */
1289 if (code == VMCB_EXIT_INVALID) {
1290 vm_exit_svm(vmexit, code, info1, info2);
1291 return (0);
1292 }
1293
1294 KASSERT((ctrl->eventinj & VMCB_EVENTINJ_VALID) == 0, ("%s: event "
1295 "injection valid bit is set %#lx", __func__, ctrl->eventinj));
1296
1297 KASSERT(vmexit->inst_length >= 0 && vmexit->inst_length <= 15,
1298 ("invalid inst_length %d: code (%#lx), info1 (%#lx), info2 (%#lx)",
1299 vmexit->inst_length, code, info1, info2));
1300
1301 svm_update_virqinfo(svm_sc, vcpu);
1302 svm_save_intinfo(svm_sc, vcpu);
1303
1304 switch (code) {
1305 case VMCB_EXIT_IRET:
1306 /*
1307 * Restart execution at "iret" but with the intercept cleared.
1308 */
1309 vmexit->inst_length = 0;
1310 clear_nmi_blocking(svm_sc, vcpu);
1311 handled = 1;
1312 break;
1313 case VMCB_EXIT_VINTR: /* interrupt window exiting */
1314 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_VINTR, 1);
1315 handled = 1;
1316 break;
1317 case VMCB_EXIT_INTR: /* external interrupt */
1318 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_EXTINT, 1);
1319 handled = 1;
1320 break;
1321 case VMCB_EXIT_NMI: /* external NMI */
1322 handled = 1;
1323 break;
1324 case VMCB_EXIT_MC: /* machine check */
1325 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_EXCEPTION, 1);
1326 break;
1327 case VMCB_EXIT_MSR: /* MSR access. */
1328 eax = state->rax;
1329 ecx = ctx->sctx_rcx;
1330 edx = ctx->e.g.sctx_rdx;
1331 retu = false;
1332
1333 if (info1) {
1334 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_WRMSR, 1);
1335 val = (uint64_t)edx << 32 | eax;
1336 VCPU_CTR2(svm_sc->vm, vcpu, "wrmsr %#x val %#lx",
1337 ecx, val);
1338 if (emulate_wrmsr(svm_sc, vcpu, ecx, val, &retu)) {
1339 vmexit->exitcode = VM_EXITCODE_WRMSR;
1340 vmexit->u.msr.code = ecx;
1341 vmexit->u.msr.wval = val;
1342 } else if (!retu) {
1343 handled = 1;
1344 } else {
1345 KASSERT(vmexit->exitcode != VM_EXITCODE_BOGUS,
1346 ("emulate_wrmsr retu with bogus exitcode"));
1347 }
1348 } else {
1349 VCPU_CTR1(svm_sc->vm, vcpu, "rdmsr %#x", ecx);
1350 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_RDMSR, 1);
1351 if (emulate_rdmsr(svm_sc, vcpu, ecx, &retu)) {
1352 vmexit->exitcode = VM_EXITCODE_RDMSR;
1353 vmexit->u.msr.code = ecx;
1354 } else if (!retu) {
1355 handled = 1;
1356 } else {
1357 KASSERT(vmexit->exitcode != VM_EXITCODE_BOGUS,
1358 ("emulate_rdmsr retu with bogus exitcode"));
1359 }
1360 }
1361 break;
1362 case VMCB_EXIT_IO:
1363 handled = svm_handle_io(svm_sc, vcpu, vmexit);
1364 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_INOUT, 1);
1365 break;
1366 case VMCB_EXIT_CPUID:
1367 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_CPUID, 1);
1368 handled = x86_emulate_cpuid(svm_sc->vm, vcpu,
1369 (uint32_t *)&state->rax,
1370 (uint32_t *)&ctx->sctx_rbx,
1371 (uint32_t *)&ctx->sctx_rcx,
1372 (uint32_t *)&ctx->e.g.sctx_rdx);
1373 break;
1374 case VMCB_EXIT_HLT:
1375 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_HLT, 1);
1376 vmexit->exitcode = VM_EXITCODE_HLT;
1377 vmexit->u.hlt.rflags = state->rflags;
1378 break;
1379 case VMCB_EXIT_PAUSE:
1380 vmexit->exitcode = VM_EXITCODE_PAUSE;
1381 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_PAUSE, 1);
1382 break;
1383 case VMCB_EXIT_NPF:
1384 /* EXITINFO2 contains the faulting guest physical address */
1385 if (info1 & VMCB_NPF_INFO1_RSV) {
1386 VCPU_CTR2(svm_sc->vm, vcpu, "nested page fault with "
1387 "reserved bits set: info1(%#lx) info2(%#lx)",
1388 info1, info2);
1389 } else if (vm_mem_allocated(svm_sc->vm, info2)) {
1390 vmexit->exitcode = VM_EXITCODE_PAGING;
1391 vmexit->u.paging.gpa = info2;
1392 vmexit->u.paging.fault_type = svm_npf_paging(info1);
1393 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_NESTED_FAULT, 1);
1394 VCPU_CTR3(svm_sc->vm, vcpu, "nested page fault "
1395 "on gpa %#lx/%#lx at rip %#lx",
1396 info2, info1, state->rip);
1397 } else if (svm_npf_emul_fault(info1)) {
1398 svm_handle_inst_emul(vmcb, info2, vmexit);
1399 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_INST_EMUL, 1);
1400 VCPU_CTR3(svm_sc->vm, vcpu, "inst_emul fault "
1401 "for gpa %#lx/%#lx at rip %#lx",
1402 info2, info1, state->rip);
1403 }
1404 break;
1405 default:
1406 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_UNKNOWN, 1);
1407 break;
1408 }
1409
1410 VCPU_CTR4(svm_sc->vm, vcpu, "%s %s vmexit at %#lx/%d",
1411 handled ? "handled" : "unhandled", exit_reason_to_str(code),
1412 vmexit->rip, vmexit->inst_length);
1413
1414 if (handled) {
1415 vmexit->rip += vmexit->inst_length;
1416 vmexit->inst_length = 0;
1417 state->rip = vmexit->rip;
1418 } else {
1419 if (vmexit->exitcode == VM_EXITCODE_BOGUS) {
1420 /*
1421 * If this VM exit was not claimed by anybody then
1422 * treat it as a generic SVM exit.
1423 */
1424 vm_exit_svm(vmexit, code, info1, info2);
1425 } else {
1426 /*
1427 * The exitcode and collateral have been populated.
1428 * The VM exit will be processed further in userland.
1429 */
1430 }
1431 }
1432 return (handled);
1433}
1434
1435static void
1436svm_inj_intinfo(struct svm_softc *svm_sc, int vcpu)
1437{
1438 uint64_t intinfo;
1439
1440 if (!vm_entry_intinfo(svm_sc->vm, vcpu, &intinfo))
1441 return;
1442
1443 KASSERT(VMCB_EXITINTINFO_VALID(intinfo), ("%s: entry intinfo is not "
1444 "valid: %#lx", __func__, intinfo));
1445
1446 svm_eventinject(svm_sc, vcpu, VMCB_EXITINTINFO_TYPE(intinfo),
1447 VMCB_EXITINTINFO_VECTOR(intinfo),
1448 VMCB_EXITINTINFO_EC(intinfo),
1449 VMCB_EXITINTINFO_EC_VALID(intinfo));
1450 vmm_stat_incr(svm_sc->vm, vcpu, VCPU_INTINFO_INJECTED, 1);
1451 VCPU_CTR1(svm_sc->vm, vcpu, "Injected entry intinfo: %#lx", intinfo);
1452}
1453
1454/*
1455 * Inject event to virtual cpu.
1456 */
1457static void
1458svm_inj_interrupts(struct svm_softc *sc, int vcpu, struct vlapic *vlapic)
1459{
1460 struct vmcb_ctrl *ctrl;
1461 struct vmcb_state *state;
1462 uint8_t v_tpr;
1463 int vector, need_intr_window, pending_apic_vector;
1464
1465 state = svm_get_vmcb_state(sc, vcpu);
1466 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1467
1468 need_intr_window = 0;
1469 pending_apic_vector = 0;
1470
1471 /*
1472 * Inject pending events or exceptions for this vcpu.
1473 *
1474 * An event might be pending because the previous #VMEXIT happened
1475 * during event delivery (i.e. ctrl->exitintinfo).
1476 *
1477 * An event might also be pending because an exception was injected
1478 * by the hypervisor (e.g. #PF during instruction emulation).
1479 */
1480 svm_inj_intinfo(sc, vcpu);
1481
1482 /* NMI event has priority over interrupts. */
1483 if (vm_nmi_pending(sc->vm, vcpu)) {
1484 if (nmi_blocked(sc, vcpu)) {
1485 /*
1486 * Can't inject another NMI if the guest has not
1487 * yet executed an "iret" after the last NMI.
1488 */
1489 VCPU_CTR0(sc->vm, vcpu, "Cannot inject NMI due "
1490 "to NMI-blocking");
1491 } else if (ctrl->intr_shadow) {
1492 /*
1493 * Can't inject an NMI if the vcpu is in an intr_shadow.
1494 */
1495 VCPU_CTR0(sc->vm, vcpu, "Cannot inject NMI due to "
1496 "interrupt shadow");
1497 need_intr_window = 1;
1498 goto done;
1499 } else if (ctrl->eventinj & VMCB_EVENTINJ_VALID) {
1500 /*
1501 * If there is already an exception/interrupt pending
1502 * then defer the NMI until after that.
1503 */
1504 VCPU_CTR1(sc->vm, vcpu, "Cannot inject NMI due to "
1505 "eventinj %#lx", ctrl->eventinj);
1506
1507 /*
1508 * Use self-IPI to trigger a VM-exit as soon as
1509 * possible after the event injection is completed.
1510 *
1511 * This works only if the external interrupt exiting
1512 * is at a lower priority than the event injection.
1513 *
1514 * Although not explicitly specified in APMv2 the
1515 * relative priorities were verified empirically.
1516 */
1517 ipi_cpu(curcpu, IPI_AST); /* XXX vmm_ipinum? */
1518 } else {
1519 vm_nmi_clear(sc->vm, vcpu);
1520
1521 /* Inject NMI, vector number is not used */
1522 svm_eventinject(sc, vcpu, VMCB_EVENTINJ_TYPE_NMI,
1523 IDT_NMI, 0, false);
1524
1525 /* virtual NMI blocking is now in effect */
1526 enable_nmi_blocking(sc, vcpu);
1527
1528 VCPU_CTR0(sc->vm, vcpu, "Injecting vNMI");
1529 }
1530 }
1531
1532 if (!vm_extint_pending(sc->vm, vcpu)) {
1533 /*
1534 * APIC interrupts are delivered using the V_IRQ offload.
1535 *
1536 * The primary benefit is that the hypervisor doesn't need to
1537 * deal with the various conditions that inhibit interrupts.
1538 * It also means that TPR changes via CR8 will be handled
1539 * without any hypervisor involvement.
1540 *
1541 * Note that the APIC vector must remain pending in the vIRR
1542 * until it is confirmed that it was delivered to the guest.
1543 * This can be confirmed based on the value of V_IRQ at the
1544 * next #VMEXIT (1 = pending, 0 = delivered).
1545 *
1546 * Also note that it is possible that another higher priority
1547 * vector can become pending before this vector is delivered
1548 * to the guest. This is alright because vcpu_notify_event()
1549 * will send an IPI and force the vcpu to trap back into the
1550 * hypervisor. The higher priority vector will be injected on
1551 * the next VMRUN.
1552 */
1553 if (vlapic_pending_intr(vlapic, &vector)) {
1554 KASSERT(vector >= 16 && vector <= 255,
1555 ("invalid vector %d from local APIC", vector));
1556 pending_apic_vector = vector;
1557 }
1558 goto done;
1559 }
1560
1561 /* Ask the legacy pic for a vector to inject */
1562 vatpic_pending_intr(sc->vm, &vector);
1563 KASSERT(vector >= 0 && vector <= 255, ("invalid vector %d from INTR",
1564 vector));
1565
1566 /*
1567 * If the guest has disabled interrupts or is in an interrupt shadow
1568 * then we cannot inject the pending interrupt.
1569 */
1570 if ((state->rflags & PSL_I) == 0) {
1571 VCPU_CTR2(sc->vm, vcpu, "Cannot inject vector %d due to "
1572 "rflags %#lx", vector, state->rflags);
1573 need_intr_window = 1;
1574 goto done;
1575 }
1576
1577 if (ctrl->intr_shadow) {
1578 VCPU_CTR1(sc->vm, vcpu, "Cannot inject vector %d due to "
1579 "interrupt shadow", vector);
1580 need_intr_window = 1;
1581 goto done;
1582 }
1583
1584 if (ctrl->eventinj & VMCB_EVENTINJ_VALID) {
1585 VCPU_CTR2(sc->vm, vcpu, "Cannot inject vector %d due to "
1586 "eventinj %#lx", vector, ctrl->eventinj);
1587 need_intr_window = 1;
1588 goto done;
1589 }
1590
1591 /*
1592 * Legacy PIC interrupts are delivered via the event injection
1593 * mechanism.
1594 */
1595 svm_eventinject(sc, vcpu, VMCB_EVENTINJ_TYPE_INTR, vector, 0, false);
1596
1597 vm_extint_clear(sc->vm, vcpu);
1598 vatpic_intr_accepted(sc->vm, vector);
1599
1600 /*
1601 * Force a VM-exit as soon as the vcpu is ready to accept another
1602 * interrupt. This is done because the PIC might have another vector
1603 * that it wants to inject. Also, if the APIC has a pending interrupt
1604 * that was preempted by the ExtInt then it allows us to inject the
1605 * APIC vector as soon as possible.
1606 */
1607 need_intr_window = 1;
1608done:
1609 /*
1610 * The guest can modify the TPR by writing to %CR8. In guest mode
1611 * the processor reflects this write to V_TPR without hypervisor
1612 * intervention.
1613 *
1614 * The guest can also modify the TPR by writing to it via the memory
1615 * mapped APIC page. In this case, the write will be emulated by the
1616 * hypervisor. For this reason V_TPR must be updated before every
1617 * VMRUN.
1618 */
1619 v_tpr = vlapic_get_cr8(vlapic);
1620 KASSERT(v_tpr >= 0 && v_tpr <= 15, ("invalid v_tpr %#x", v_tpr));
1621 if (ctrl->v_tpr != v_tpr) {
1622 VCPU_CTR2(sc->vm, vcpu, "VMCB V_TPR changed from %#x to %#x",
1623 ctrl->v_tpr, v_tpr);
1624 ctrl->v_tpr = v_tpr;
1625 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_TPR);
1626 }
1627
1628 if (pending_apic_vector) {
1629 /*
1630 * If an APIC vector is being injected then interrupt window
1631 * exiting is not possible on this VMRUN.
1632 */
1633 KASSERT(!need_intr_window, ("intr_window exiting impossible"));
1634 VCPU_CTR1(sc->vm, vcpu, "Injecting vector %d using V_IRQ",
1635 pending_apic_vector);
1636
1637 ctrl->v_irq = 1;
1638 ctrl->v_ign_tpr = 0;
1639 ctrl->v_intr_vector = pending_apic_vector;
1640 ctrl->v_intr_prio = pending_apic_vector >> 4;
1641 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_TPR);
1642 } else if (need_intr_window) {
1643 /*
1644 * We use V_IRQ in conjunction with the VINTR intercept to
1645 * trap into the hypervisor as soon as a virtual interrupt
1646 * can be delivered.
1647 *
1648 * Since injected events are not subject to intercept checks
1649 * we need to ensure that the V_IRQ is not actually going to
1650 * be delivered on VM entry. The KASSERT below enforces this.
1651 */
1652 KASSERT((ctrl->eventinj & VMCB_EVENTINJ_VALID) != 0 ||
1653 (state->rflags & PSL_I) == 0 || ctrl->intr_shadow,
1654 ("Bogus intr_window_exiting: eventinj (%#lx), "
1655 "intr_shadow (%u), rflags (%#lx)",
1656 ctrl->eventinj, ctrl->intr_shadow, state->rflags));
1657 enable_intr_window_exiting(sc, vcpu);
1658 } else {
1659 disable_intr_window_exiting(sc, vcpu);
1660 }
1661}
1662
1663static __inline void
1664restore_host_tss(void)
1665{
1666 struct system_segment_descriptor *tss_sd;
1667
1668 /*
1669 * The TSS descriptor was in use prior to launching the guest so it
1670 * has been marked busy.
1671 *
1672 * 'ltr' requires the descriptor to be marked available so change the
1673 * type to "64-bit available TSS".
1674 */
1675 tss_sd = PCPU_GET(tss);
1676 tss_sd->sd_type = SDT_SYSTSS;
1677 ltr(GSEL(GPROC0_SEL, SEL_KPL));
1678}
1679
1680static void
1681check_asid(struct svm_softc *sc, int vcpuid, pmap_t pmap, u_int thiscpu)
1682{
1683 struct svm_vcpu *vcpustate;
1684 struct vmcb_ctrl *ctrl;
1685 long eptgen;
1686 bool alloc_asid;
1687
1688 KASSERT(CPU_ISSET(thiscpu, &pmap->pm_active), ("%s: nested pmap not "
1689 "active on cpu %u", __func__, thiscpu));
1690
1691 vcpustate = svm_get_vcpu(sc, vcpuid);
1692 ctrl = svm_get_vmcb_ctrl(sc, vcpuid);
1693
1694 /*
1695 * The TLB entries associated with the vcpu's ASID are not valid
1696 * if either of the following conditions is true:
1697 *
1698 * 1. The vcpu's ASID generation is different than the host cpu's
1699 * ASID generation. This happens when the vcpu migrates to a new
1700 * host cpu. It can also happen when the number of vcpus executing
1701 * on a host cpu is greater than the number of ASIDs available.
1702 *
1703 * 2. The pmap generation number is different than the value cached in
1704 * the 'vcpustate'. This happens when the host invalidates pages
1705 * belonging to the guest.
1706 *
1707 * asidgen eptgen Action
1708 * mismatch mismatch
1709 * 0 0 (a)
1710 * 0 1 (b1) or (b2)
1711 * 1 0 (c)
1712 * 1 1 (d)
1713 *
1714 * (a) There is no mismatch in eptgen or ASID generation and therefore
1715 * no further action is needed.
1716 *
1717 * (b1) If the cpu supports FlushByAsid then the vcpu's ASID is
1718 * retained and the TLB entries associated with this ASID
1719 * are flushed by VMRUN.
1720 *
1721 * (b2) If the cpu does not support FlushByAsid then a new ASID is
1722 * allocated.
1723 *
1724 * (c) A new ASID is allocated.
1725 *
1726 * (d) A new ASID is allocated.
1727 */
1728
1729 alloc_asid = false;
1730 eptgen = pmap->pm_eptgen;
1731 ctrl->tlb_ctrl = VMCB_TLB_FLUSH_NOTHING;
1732
1733 if (vcpustate->asid.gen != asid[thiscpu].gen) {
1734 alloc_asid = true; /* (c) and (d) */
1735 } else if (vcpustate->eptgen != eptgen) {
1736 if (flush_by_asid())
1737 ctrl->tlb_ctrl = VMCB_TLB_FLUSH_GUEST; /* (b1) */
1738 else
1739 alloc_asid = true; /* (b2) */
1740 } else {
1741 /*
1742 * This is the common case (a).
1743 */
1744 KASSERT(!alloc_asid, ("ASID allocation not necessary"));
1745 KASSERT(ctrl->tlb_ctrl == VMCB_TLB_FLUSH_NOTHING,
1746 ("Invalid VMCB tlb_ctrl: %#x", ctrl->tlb_ctrl));
1747 }
1748
1749 if (alloc_asid) {
1750 if (++asid[thiscpu].num >= nasid) {
1751 asid[thiscpu].num = 1;
1752 if (++asid[thiscpu].gen == 0)
1753 asid[thiscpu].gen = 1;
1754 /*
1755 * If this cpu does not support "flush-by-asid"
1756 * then flush the entire TLB on a generation
1757 * bump. Subsequent ASID allocation in this
1758 * generation can be done without a TLB flush.
1759 */
1760 if (!flush_by_asid())
1761 ctrl->tlb_ctrl = VMCB_TLB_FLUSH_ALL;
1762 }
1763 vcpustate->asid.gen = asid[thiscpu].gen;
1764 vcpustate->asid.num = asid[thiscpu].num;
1765
1766 ctrl->asid = vcpustate->asid.num;
1767 vcpu_set_dirty(sc, vcpuid, VMCB_CACHE_ASID);
1768 /*
1769 * If this cpu supports "flush-by-asid" then the TLB
1770 * was not flushed after the generation bump. The TLB
1771 * is flushed selectively after every new ASID allocation.
1772 */
1773 if (flush_by_asid())
1774 ctrl->tlb_ctrl = VMCB_TLB_FLUSH_GUEST;
1775 }
1776 vcpustate->eptgen = eptgen;
1777
1778 KASSERT(ctrl->asid != 0, ("Guest ASID must be non-zero"));
1779 KASSERT(ctrl->asid == vcpustate->asid.num,
1780 ("ASID mismatch: %u/%u", ctrl->asid, vcpustate->asid.num));
1781}
1782
1783/*
1784 * Start vcpu with specified RIP.
1785 */
1786static int
1787svm_vmrun(void *arg, int vcpu, register_t rip, pmap_t pmap,
1788 void *rend_cookie, void *suspended_cookie)
1789{
1790 struct svm_regctx *hctx, *gctx;
1791 struct svm_softc *svm_sc;
1792 struct svm_vcpu *vcpustate;
1793 struct vmcb_state *state;
1794 struct vmcb_ctrl *ctrl;
1795 struct vm_exit *vmexit;
1796 struct vlapic *vlapic;
1797 struct vm *vm;
1798 uint64_t vmcb_pa;
1799 u_int thiscpu;
1800 int handled;
1801
1802 svm_sc = arg;
1803 vm = svm_sc->vm;
1804
1805 vcpustate = svm_get_vcpu(svm_sc, vcpu);
1806 state = svm_get_vmcb_state(svm_sc, vcpu);
1807 ctrl = svm_get_vmcb_ctrl(svm_sc, vcpu);
1808 vmexit = vm_exitinfo(vm, vcpu);
1809 vlapic = vm_lapic(vm, vcpu);
1810
1811 /*
1812 * Stash 'curcpu' on the stack as 'thiscpu'.
1813 *
1814 * The per-cpu data area is not accessible until MSR_GSBASE is restored
1815 * after the #VMEXIT. Since VMRUN is executed inside a critical section
1816 * 'curcpu' and 'thiscpu' are guaranteed to identical.
1817 */
1818 thiscpu = curcpu;
1819
1820 gctx = svm_get_guest_regctx(svm_sc, vcpu);
1821 hctx = &host_ctx[thiscpu];
1822 vmcb_pa = svm_sc->vcpu[vcpu].vmcb_pa;
1823
1824 if (vcpustate->lastcpu != thiscpu) {
1825 /*
1826 * Force new ASID allocation by invalidating the generation.
1827 */
1828 vcpustate->asid.gen = 0;
1829
1830 /*
1831 * Invalidate the VMCB state cache by marking all fields dirty.
1832 */
1833 vcpu_set_dirty(svm_sc, vcpu, 0xffffffff);
1834
1835 /*
1836 * XXX
1837 * Setting 'vcpustate->lastcpu' here is bit premature because
1838 * we may return from this function without actually executing
1839 * the VMRUN instruction. This could happen if a rendezvous
1840 * or an AST is pending on the first time through the loop.
1841 *
1842 * This works for now but any new side-effects of vcpu
1843 * migration should take this case into account.
1844 */
1845 vcpustate->lastcpu = thiscpu;
1846 vmm_stat_incr(vm, vcpu, VCPU_MIGRATIONS, 1);
1847 }
1848
1849 svm_msr_guest_enter(svm_sc, vcpu);
1850
1851 /* Update Guest RIP */
1852 state->rip = rip;
1853
1854 do {
1855 /*
1856 * Disable global interrupts to guarantee atomicity during
1857 * loading of guest state. This includes not only the state
1858 * loaded by the "vmrun" instruction but also software state
1859 * maintained by the hypervisor: suspended and rendezvous
1860 * state, NPT generation number, vlapic interrupts etc.
1861 */
1862 disable_gintr();
1863
1864 if (vcpu_suspended(suspended_cookie)) {
1865 enable_gintr();
1866 vm_exit_suspended(vm, vcpu, state->rip);
1867 break;
1868 }
1869
1870 if (vcpu_rendezvous_pending(rend_cookie)) {
1871 enable_gintr();
1872 vm_exit_rendezvous(vm, vcpu, state->rip);
1873 break;
1874 }
1875
1876 /* We are asked to give the cpu by scheduler. */
1877 if (curthread->td_flags & (TDF_ASTPENDING | TDF_NEEDRESCHED)) {
1878 enable_gintr();
1879 vm_exit_astpending(vm, vcpu, state->rip);
1880 break;
1881 }
1882
1883 svm_inj_interrupts(svm_sc, vcpu, vlapic);
1884
1885 /* Activate the nested pmap on 'thiscpu' */
1886 CPU_SET_ATOMIC_ACQ(thiscpu, &pmap->pm_active);
1887
1888 /*
1889 * Check the pmap generation and the ASID generation to
1890 * ensure that the vcpu does not use stale TLB mappings.
1891 */
1892 check_asid(svm_sc, vcpu, pmap, thiscpu);
1893
1894 ctrl->vmcb_clean = VMCB_CACHE_DEFAULT & ~vcpustate->dirty;
1895 vcpustate->dirty = 0;
1896 VCPU_CTR1(vm, vcpu, "vmcb clean %#x", ctrl->vmcb_clean);
1897
1898 /* Launch Virtual Machine. */
1899 VCPU_CTR1(vm, vcpu, "Resume execution at %#lx", state->rip);
1900 svm_launch(vmcb_pa, gctx, hctx);
1901
1902 CPU_CLR_ATOMIC(thiscpu, &pmap->pm_active);
1903
1904 /*
1905 * Restore MSR_GSBASE to point to the pcpu data area.
1906 *
1907 * Note that accesses done via PCPU_GET/PCPU_SET will work
1908 * only after MSR_GSBASE is restored.
1909 *
1910 * Also note that we don't bother restoring MSR_KGSBASE
1911 * since it is not used in the kernel and will be restored
1912 * when the VMRUN ioctl returns to userspace.
1913 */
1914 wrmsr(MSR_GSBASE, (uint64_t)&__pcpu[thiscpu]);
1915 KASSERT(curcpu == thiscpu, ("thiscpu/curcpu (%u/%u) mismatch",
1916 thiscpu, curcpu));
1917
1918 /*
1919 * The host GDTR and IDTR is saved by VMRUN and restored
1920 * automatically on #VMEXIT. However, the host TSS needs
1921 * to be restored explicitly.
1922 */
1923 restore_host_tss();
1924
1925 /* #VMEXIT disables interrupts so re-enable them here. */
1926 enable_gintr();
1927
1928 /* Handle #VMEXIT and if required return to user space. */
1929 handled = svm_vmexit(svm_sc, vcpu, vmexit);
1930 } while (handled);
1931
1932 svm_msr_guest_exit(svm_sc, vcpu);
1933
1934 return (0);
1935}
1936
1937/*
1938 * Cleanup for virtual machine.
1939 */
1940static void
1941svm_vmcleanup(void *arg)
1942{
1943 struct svm_softc *svm_sc;
1944
1945 svm_sc = arg;
1946
1947 VCPU_CTR0(svm_sc->vm, 0, "SVM:cleanup\n");
1948
1949 free(svm_sc, M_SVM);
1950}
1951
1952/*
1953 * Return pointer to hypervisor saved register state.
1954 */
1955static register_t *
1956swctx_regptr(struct svm_regctx *regctx, int reg)
1957{
1958
1959 switch (reg) {
1960 case VM_REG_GUEST_RBX:
1961 return (®ctx->sctx_rbx);
1962 case VM_REG_GUEST_RCX:
1963 return (®ctx->sctx_rcx);
1964 case VM_REG_GUEST_RDX:
1965 return (®ctx->e.g.sctx_rdx);
1966 case VM_REG_GUEST_RDI:
1967 return (®ctx->e.g.sctx_rdi);
1968 case VM_REG_GUEST_RSI:
1969 return (®ctx->e.g.sctx_rsi);
1970 case VM_REG_GUEST_RBP:
1971 return (®ctx->sctx_rbp);
1972 case VM_REG_GUEST_R8:
1973 return (®ctx->sctx_r8);
1974 case VM_REG_GUEST_R9:
1975 return (®ctx->sctx_r9);
1976 case VM_REG_GUEST_R10:
1977 return (®ctx->sctx_r10);
1978 case VM_REG_GUEST_R11:
1979 return (®ctx->sctx_r11);
1980 case VM_REG_GUEST_R12:
1981 return (®ctx->sctx_r12);
1982 case VM_REG_GUEST_R13:
1983 return (®ctx->sctx_r13);
1984 case VM_REG_GUEST_R14:
1985 return (®ctx->sctx_r14);
1986 case VM_REG_GUEST_R15:
1987 return (®ctx->sctx_r15);
1988 default:
1989 ERR("Unknown register requested, reg=%d.\n", reg);
1990 break;
1991 }
1992
1993 return (NULL);
1994}
1995
1996/*
1997 * Interface to read guest registers.
1998 * This can be SVM h/w saved or hypervisor saved register.
1999 */
2000static int
2001svm_getreg(void *arg, int vcpu, int ident, uint64_t *val)
2002{
2003 struct svm_softc *svm_sc;
2004 struct vmcb *vmcb;
2005 register_t *reg;
2006
2007 svm_sc = arg;
2008 vmcb = svm_get_vmcb(svm_sc, vcpu);
2009
2010 if (ident == VM_REG_GUEST_INTR_SHADOW) {
2011 return (svm_get_intr_shadow(svm_sc, vcpu, val));
2012 }
2013
2014 if (vmcb_read(vmcb, ident, val) == 0) {
2015 return (0);
2016 }
2017
2018 reg = swctx_regptr(svm_get_guest_regctx(svm_sc, vcpu), ident);
2019
2020 if (reg != NULL) {
2021 *val = *reg;
2022 return (0);
2023 }
2024
2025 ERR("SVM_ERR:reg type %x is not saved in VMCB.\n", ident);
2026 return (EINVAL);
2027}
2028
2029/*
2030 * Interface to write to guest registers.
2031 * This can be SVM h/w saved or hypervisor saved register.
2032 */
2033static int
2034svm_setreg(void *arg, int vcpu, int ident, uint64_t val)
2035{
2036 struct svm_softc *svm_sc;
2037 struct vmcb *vmcb;
2038 register_t *reg;
2039
2040 svm_sc = arg;
2041 vmcb = svm_get_vmcb(svm_sc, vcpu);
2042
2043 if (ident == VM_REG_GUEST_INTR_SHADOW) {
2044 return (svm_modify_intr_shadow(svm_sc, vcpu, val));
2045 }
2046
2047 if (vmcb_write(vmcb, ident, val) == 0) {
2048 return (0);
2049 }
2050
2051 reg = swctx_regptr(svm_get_guest_regctx(svm_sc, vcpu), ident);
2052
2053 if (reg != NULL) {
2054 *reg = val;
2055 return (0);
2056 }
2057
2058 /*
2059 * XXX deal with CR3 and invalidate TLB entries tagged with the
2060 * vcpu's ASID. This needs to be treated differently depending on
2061 * whether 'running' is true/false.
2062 */
2063
2064 ERR("SVM_ERR:reg type %x is not saved in VMCB.\n", ident);
2065 return (EINVAL);
2066}
2067
2068
2069/*
2070 * Inteface to set various descriptors.
2071 */
2072static int
2073svm_setdesc(void *arg, int vcpu, int type, struct seg_desc *desc)
2074{
2075 struct svm_softc *svm_sc;
2076 struct vmcb *vmcb;
2077 struct vmcb_segment *seg;
2078 uint16_t attrib;
2079
2080 svm_sc = arg;
2081 vmcb = svm_get_vmcb(svm_sc, vcpu);
2082
2083 VCPU_CTR1(svm_sc->vm, vcpu, "SVM:set_desc: Type%d\n", type);
2084
2085 seg = vmcb_seg(vmcb, type);
2086 if (seg == NULL) {
2087 ERR("SVM_ERR:Unsupported segment type%d\n", type);
2088 return (EINVAL);
2089 }
2090
2091 /* Map seg_desc access to VMCB attribute format.*/
2092 attrib = ((desc->access & 0xF000) >> 4) | (desc->access & 0xFF);
2093 VCPU_CTR3(svm_sc->vm, vcpu, "SVM:[sel %d attribute 0x%x limit:0x%x]\n",
2094 type, desc->access, desc->limit);
2095 seg->attrib = attrib;
2096 seg->base = desc->base;
2097 seg->limit = desc->limit;
2098
2099 return (0);
2100}
2101
2102/*
2103 * Interface to get guest descriptor.
2104 */
2105static int
2106svm_getdesc(void *arg, int vcpu, int type, struct seg_desc *desc)
2107{
2108 struct svm_softc *svm_sc;
2109 struct vmcb_segment *seg;
2110
2111 svm_sc = arg;
2112 VCPU_CTR1(svm_sc->vm, vcpu, "SVM:get_desc: Type%d\n", type);
2113
2114 seg = vmcb_seg(svm_get_vmcb(svm_sc, vcpu), type);
2115 if (!seg) {
2116 ERR("SVM_ERR:Unsupported segment type%d\n", type);
2117 return (EINVAL);
2118 }
2119
2120 /* Map seg_desc access to VMCB attribute format.*/
2121 desc->access = ((seg->attrib & 0xF00) << 4) | (seg->attrib & 0xFF);
2122 desc->base = seg->base;
2123 desc->limit = seg->limit;
2124
2125 /*
2126 * VT-x uses bit 16 (Unusable) to indicate a segment that has been
2127 * loaded with a NULL segment selector. The 'desc->access' field is
2128 * interpreted in the VT-x format by the processor-independent code.
2129 *
2130 * SVM uses the 'P' bit to convey the same information so convert it
2131 * into the VT-x format. For more details refer to section
2132 * "Segment State in the VMCB" in APMv2.
2133 */
2134 if (type == VM_REG_GUEST_CS && type == VM_REG_GUEST_TR)
2135 desc->access |= 0x80; /* CS and TS always present */
2136
2137 if (!(desc->access & 0x80))
2138 desc->access |= 0x10000; /* Unusable segment */
2139
2140 return (0);
2141}
2142
2143static int
2144svm_setcap(void *arg, int vcpu, int type, int val)
2145{
2146 struct svm_softc *sc;
2147 int error;
2148
2149 sc = arg;
2150 error = 0;
2151 switch (type) {
2152 case VM_CAP_HALT_EXIT:
2153 svm_set_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
2154 VMCB_INTCPT_HLT, val);
2155 break;
2156 case VM_CAP_PAUSE_EXIT:
2157 svm_set_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
2158 VMCB_INTCPT_PAUSE, val);
2159 break;
2160 case VM_CAP_UNRESTRICTED_GUEST:
2161 /* Unrestricted guest execution cannot be disabled in SVM */
2162 if (val == 0)
2163 error = EINVAL;
2164 break;
2165 default:
2166 error = ENOENT;
2167 break;
2168 }
2169 return (error);
2170}
2171
2172static int
2173svm_getcap(void *arg, int vcpu, int type, int *retval)
2174{
2175 struct svm_softc *sc;
2176 int error;
2177
2178 sc = arg;
2179 error = 0;
2180
2181 switch (type) {
2182 case VM_CAP_HALT_EXIT:
2183 *retval = svm_get_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
2184 VMCB_INTCPT_HLT);
2185 break;
2186 case VM_CAP_PAUSE_EXIT:
2187 *retval = svm_get_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
2188 VMCB_INTCPT_PAUSE);
2189 break;
2190 case VM_CAP_UNRESTRICTED_GUEST:
2191 *retval = 1; /* unrestricted guest is always enabled */
2192 break;
2193 default:
2194 error = ENOENT;
2195 break;
2196 }
2197 return (error);
2198}
2199
2200static struct vlapic *
2201svm_vlapic_init(void *arg, int vcpuid)
2202{
2203 struct svm_softc *svm_sc;
2204 struct vlapic *vlapic;
2205
2206 svm_sc = arg;
2207 vlapic = malloc(sizeof(struct vlapic), M_SVM_VLAPIC, M_WAITOK | M_ZERO);
2208 vlapic->vm = svm_sc->vm;
2209 vlapic->vcpuid = vcpuid;
2210 vlapic->apic_page = (struct LAPIC *)&svm_sc->apic_page[vcpuid];
2211
2212 vlapic_init(vlapic);
2213
2214 return (vlapic);
2215}
2216
2217static void
2218svm_vlapic_cleanup(void *arg, struct vlapic *vlapic)
2219{
2220
2221 vlapic_cleanup(vlapic);
2222 free(vlapic, M_SVM_VLAPIC);
2223}
2224
2225struct vmm_ops vmm_ops_amd = {
2226 svm_init,
2227 svm_cleanup,
2228 svm_restore,
2229 svm_vminit,
2230 svm_vmrun,
2231 svm_vmcleanup,
2232 svm_getreg,
2233 svm_setreg,
2234 svm_getdesc,
2235 svm_setdesc,
2236 svm_getcap,
2237 svm_setcap,
2238 svm_npt_alloc,
2239 svm_npt_free,
2240 svm_vlapic_init,
2241 svm_vlapic_cleanup
2242};
2 * Copyright (c) 2013, Anish Gupta (akgupt3@gmail.com)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: projects/bhyve_svm/sys/amd64/vmm/amd/svm.c 271912 2014-09-20 21:46:31Z neel $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/smp.h>
33#include <sys/kernel.h>
34#include <sys/malloc.h>
35#include <sys/pcpu.h>
36#include <sys/proc.h>
37#include <sys/sysctl.h>
38
39#include <vm/vm.h>
40#include <vm/pmap.h>
41
42#include <machine/cpufunc.h>
43#include <machine/psl.h>
44#include <machine/pmap.h>
45#include <machine/md_var.h>
46#include <machine/vmparam.h>
47#include <machine/specialreg.h>
48#include <machine/segments.h>
49#include <machine/smp.h>
50#include <machine/vmm.h>
51#include <machine/vmm_dev.h>
52#include <machine/vmm_instruction_emul.h>
53
54#include <x86/apicreg.h>
55
56#include "vmm_lapic.h"
57#include "vmm_stat.h"
58#include "vmm_ktr.h"
59#include "vmm_ioport.h"
60#include "vatpic.h"
61#include "vlapic.h"
62#include "vlapic_priv.h"
63
64#include "x86.h"
65#include "vmcb.h"
66#include "svm.h"
67#include "svm_softc.h"
68#include "svm_msr.h"
69#include "npt.h"
70
71SYSCTL_DECL(_hw_vmm);
72SYSCTL_NODE(_hw_vmm, OID_AUTO, svm, CTLFLAG_RW, NULL, NULL);
73
74/*
75 * SVM CPUID function 0x8000_000A, edx bit decoding.
76 */
77#define AMD_CPUID_SVM_NP BIT(0) /* Nested paging or RVI */
78#define AMD_CPUID_SVM_LBR BIT(1) /* Last branch virtualization */
79#define AMD_CPUID_SVM_SVML BIT(2) /* SVM lock */
80#define AMD_CPUID_SVM_NRIP_SAVE BIT(3) /* Next RIP is saved */
81#define AMD_CPUID_SVM_TSC_RATE BIT(4) /* TSC rate control. */
82#define AMD_CPUID_SVM_VMCB_CLEAN BIT(5) /* VMCB state caching */
83#define AMD_CPUID_SVM_FLUSH_BY_ASID BIT(6) /* Flush by ASID */
84#define AMD_CPUID_SVM_DECODE_ASSIST BIT(7) /* Decode assist */
85#define AMD_CPUID_SVM_PAUSE_INC BIT(10) /* Pause intercept filter. */
86#define AMD_CPUID_SVM_PAUSE_FTH BIT(12) /* Pause filter threshold */
87
88#define VMCB_CACHE_DEFAULT (VMCB_CACHE_ASID | \
89 VMCB_CACHE_IOPM | \
90 VMCB_CACHE_I | \
91 VMCB_CACHE_TPR | \
92 VMCB_CACHE_NP)
93
94MALLOC_DEFINE(M_SVM, "svm", "svm");
95MALLOC_DEFINE(M_SVM_VLAPIC, "svm-vlapic", "svm-vlapic");
96
97/* Per-CPU context area. */
98extern struct pcpu __pcpu[];
99
100static int svm_getdesc(void *arg, int vcpu, int type, struct seg_desc *desc);
101
102static uint32_t svm_feature; /* AMD SVM features. */
103SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, features, CTLFLAG_RD, &svm_feature, 0,
104 "SVM features advertised by CPUID.8000000AH:EDX");
105
106static int disable_npf_assist;
107SYSCTL_INT(_hw_vmm_svm, OID_AUTO, disable_npf_assist, CTLFLAG_RWTUN,
108 &disable_npf_assist, 0, NULL);
109
110/* Maximum ASIDs supported by the processor */
111static uint32_t nasid;
112SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, num_asids, CTLFLAG_RD, &nasid, 0,
113 "Number of ASIDs supported by this processor");
114
115/* Current ASID generation for each host cpu */
116static struct asid asid[MAXCPU];
117
118/*
119 * SVM host state saved area of size 4KB for each core.
120 */
121static uint8_t hsave[MAXCPU][PAGE_SIZE] __aligned(PAGE_SIZE);
122
123/*
124 * S/w saved host context.
125 */
126static struct svm_regctx host_ctx[MAXCPU];
127
128static VMM_STAT_AMD(VCPU_EXITINTINFO, "VM exits during event delivery");
129static VMM_STAT_AMD(VCPU_INTINFO_INJECTED, "Events pending at VM entry");
130static VMM_STAT_AMD(VMEXIT_VINTR, "VM exits due to interrupt window");
131
132/*
133 * Common function to enable or disabled SVM for a CPU.
134 */
135static int
136cpu_svm_enable_disable(boolean_t enable)
137{
138 uint64_t efer_msr;
139
140 efer_msr = rdmsr(MSR_EFER);
141
142 if (enable)
143 efer_msr |= EFER_SVM;
144 else
145 efer_msr &= ~EFER_SVM;
146
147 wrmsr(MSR_EFER, efer_msr);
148
149 return(0);
150}
151
152/*
153 * Disable SVM on a CPU.
154 */
155static void
156svm_disable(void *arg __unused)
157{
158
159 (void)cpu_svm_enable_disable(FALSE);
160}
161
162/*
163 * Disable SVM for all CPUs.
164 */
165static int
166svm_cleanup(void)
167{
168
169 smp_rendezvous(NULL, svm_disable, NULL, NULL);
170 return (0);
171}
172
173/*
174 * Check for required BHyVe SVM features in a CPU.
175 */
176static int
177svm_cpuid_features(void)
178{
179 u_int regs[4];
180
181 /* CPUID Fn8000_000A is for SVM */
182 do_cpuid(0x8000000A, regs);
183 svm_feature = regs[3];
184
185 printf("SVM rev: 0x%x NASID:0x%x\n", regs[0] & 0xFF, regs[1]);
186 nasid = regs[1];
187 KASSERT(nasid > 1, ("Insufficient ASIDs for guests: %#x", nasid));
188
189 printf("SVM Features:0x%b\n", svm_feature,
190 "\020"
191 "\001NP" /* Nested paging */
192 "\002LbrVirt" /* LBR virtualization */
193 "\003SVML" /* SVM lock */
194 "\004NRIPS" /* NRIP save */
195 "\005TscRateMsr" /* MSR based TSC rate control */
196 "\006VmcbClean" /* VMCB clean bits */
197 "\007FlushByAsid" /* Flush by ASID */
198 "\010DecodeAssist" /* Decode assist */
199 "\011<b20>"
200 "\012<b20>"
201 "\013PauseFilter"
202 "\014<b20>"
203 "\015PauseFilterThreshold"
204 "\016AVIC"
205 );
206
207 /* SVM Lock */
208 if (!(svm_feature & AMD_CPUID_SVM_SVML)) {
209 printf("SVM is disabled by BIOS, please enable in BIOS.\n");
210 return (ENXIO);
211 }
212
213 /*
214 * bhyve need RVI to work.
215 */
216 if (!(svm_feature & AMD_CPUID_SVM_NP)) {
217 printf("Missing Nested paging or RVI SVM support in processor.\n");
218 return (EIO);
219 }
220
221 if (svm_feature & AMD_CPUID_SVM_NRIP_SAVE)
222 return (0);
223
224 return (EIO);
225}
226
227static __inline int
228flush_by_asid(void)
229{
230
231 return (svm_feature & AMD_CPUID_SVM_FLUSH_BY_ASID);
232}
233
234static __inline int
235decode_assist(void)
236{
237
238 return (svm_feature & AMD_CPUID_SVM_DECODE_ASSIST);
239}
240
241/*
242 * Enable SVM for a CPU.
243 */
244static void
245svm_enable(void *arg __unused)
246{
247 uint64_t hsave_pa;
248
249 (void)cpu_svm_enable_disable(TRUE);
250
251 hsave_pa = vtophys(hsave[curcpu]);
252 wrmsr(MSR_VM_HSAVE_PA, hsave_pa);
253
254 if (rdmsr(MSR_VM_HSAVE_PA) != hsave_pa) {
255 panic("VM_HSAVE_PA is wrong on CPU%d\n", curcpu);
256 }
257}
258
259/*
260 * Check if a processor support SVM.
261 */
262static int
263is_svm_enabled(void)
264{
265 uint64_t msr;
266
267 /* Section 15.4 Enabling SVM from APM2. */
268 if ((amd_feature2 & AMDID2_SVM) == 0) {
269 printf("SVM is not supported on this processor.\n");
270 return (ENXIO);
271 }
272
273 msr = rdmsr(MSR_VM_CR);
274 /* Make sure SVM is not disabled by BIOS. */
275 if ((msr & VM_CR_SVMDIS) == 0) {
276 return svm_cpuid_features();
277 }
278
279 printf("SVM disabled by Key, consult TPM/BIOS manual.\n");
280 return (ENXIO);
281}
282
283/*
284 * Enable SVM on CPU and initialize nested page table h/w.
285 */
286static int
287svm_init(int ipinum)
288{
289 int err, cpu;
290
291 err = is_svm_enabled();
292 if (err)
293 return (err);
294
295 for (cpu = 0; cpu < MAXCPU; cpu++) {
296 /*
297 * Initialize the host ASIDs to their "highest" valid values.
298 *
299 * The next ASID allocation will rollover both 'gen' and 'num'
300 * and start off the sequence at {1,1}.
301 */
302 asid[cpu].gen = ~0UL;
303 asid[cpu].num = nasid - 1;
304 }
305
306 svm_msr_init();
307 svm_npt_init(ipinum);
308
309 /* Start SVM on all CPUs */
310 smp_rendezvous(NULL, svm_enable, NULL, NULL);
311
312 return (0);
313}
314
315static void
316svm_restore(void)
317{
318 svm_enable(NULL);
319}
320
321/*
322 * Get index and bit position for a MSR in MSR permission
323 * bitmap. Two bits are used for each MSR, lower bit is
324 * for read and higher bit is for write.
325 */
326static int
327svm_msr_index(uint64_t msr, int *index, int *bit)
328{
329 uint32_t base, off;
330
331/* Pentium compatible MSRs */
332#define MSR_PENTIUM_START 0
333#define MSR_PENTIUM_END 0x1FFF
334/* AMD 6th generation and Intel compatible MSRs */
335#define MSR_AMD6TH_START 0xC0000000UL
336#define MSR_AMD6TH_END 0xC0001FFFUL
337/* AMD 7th and 8th generation compatible MSRs */
338#define MSR_AMD7TH_START 0xC0010000UL
339#define MSR_AMD7TH_END 0xC0011FFFUL
340
341 *index = -1;
342 *bit = (msr % 4) * 2;
343 base = 0;
344
345 if (msr >= MSR_PENTIUM_START && msr <= MSR_PENTIUM_END) {
346 *index = msr / 4;
347 return (0);
348 }
349
350 base += (MSR_PENTIUM_END - MSR_PENTIUM_START + 1);
351 if (msr >= MSR_AMD6TH_START && msr <= MSR_AMD6TH_END) {
352 off = (msr - MSR_AMD6TH_START);
353 *index = (off + base) / 4;
354 return (0);
355 }
356
357 base += (MSR_AMD6TH_END - MSR_AMD6TH_START + 1);
358 if (msr >= MSR_AMD7TH_START && msr <= MSR_AMD7TH_END) {
359 off = (msr - MSR_AMD7TH_START);
360 *index = (off + base) / 4;
361 return (0);
362 }
363
364 return (EIO);
365}
366
367/*
368 * Give virtual cpu the complete access to MSR(read & write).
369 */
370static int
371svm_msr_perm(uint8_t *perm_bitmap, uint64_t msr, bool read, bool write)
372{
373 int index, bit, err;
374
375 err = svm_msr_index(msr, &index, &bit);
376 if (err) {
377 ERR("MSR 0x%lx is not writeable by guest.\n", msr);
378 return (err);
379 }
380
381 if (index < 0 || index > (SVM_MSR_BITMAP_SIZE)) {
382 ERR("MSR 0x%lx index out of range(%d).\n", msr, index);
383 return (EINVAL);
384 }
385 if (bit < 0 || bit > 8) {
386 ERR("MSR 0x%lx bit out of range(%d).\n", msr, bit);
387 return (EINVAL);
388 }
389
390 /* Disable intercept for read and write. */
391 if (read)
392 perm_bitmap[index] &= ~(1UL << bit);
393 if (write)
394 perm_bitmap[index] &= ~(2UL << bit);
395 CTR2(KTR_VMM, "Guest has control:0x%x on SVM:MSR(0x%lx).\n",
396 (perm_bitmap[index] >> bit) & 0x3, msr);
397
398 return (0);
399}
400
401static int
402svm_msr_rw_ok(uint8_t *perm_bitmap, uint64_t msr)
403{
404 return svm_msr_perm(perm_bitmap, msr, true, true);
405}
406
407static int
408svm_msr_rd_ok(uint8_t *perm_bitmap, uint64_t msr)
409{
410 return svm_msr_perm(perm_bitmap, msr, true, false);
411}
412
413static __inline void
414vcpu_set_dirty(struct svm_softc *sc, int vcpu, uint32_t dirtybits)
415{
416 struct svm_vcpu *vcpustate;
417
418 vcpustate = svm_get_vcpu(sc, vcpu);
419
420 vcpustate->dirty |= dirtybits;
421}
422
423static __inline int
424svm_get_intercept(struct svm_softc *sc, int vcpu, int idx, uint32_t bitmask)
425{
426 struct vmcb_ctrl *ctrl;
427
428 KASSERT(idx >=0 && idx < 5, ("invalid intercept index %d", idx));
429
430 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
431 return (ctrl->intercept[idx] & bitmask ? 1 : 0);
432}
433
434static __inline void
435svm_set_intercept(struct svm_softc *sc, int vcpu, int idx, uint32_t bitmask,
436 int enabled)
437{
438 struct vmcb_ctrl *ctrl;
439 uint32_t oldval;
440
441 KASSERT(idx >=0 && idx < 5, ("invalid intercept index %d", idx));
442
443 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
444 oldval = ctrl->intercept[idx];
445
446 if (enabled)
447 ctrl->intercept[idx] |= bitmask;
448 else
449 ctrl->intercept[idx] &= ~bitmask;
450
451 if (ctrl->intercept[idx] != oldval) {
452 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_I);
453 VCPU_CTR3(sc->vm, vcpu, "intercept[%d] modified "
454 "from %#x to %#x", idx, oldval, ctrl->intercept[idx]);
455 }
456}
457
458static __inline void
459svm_disable_intercept(struct svm_softc *sc, int vcpu, int off, uint32_t bitmask)
460{
461 svm_set_intercept(sc, vcpu, off, bitmask, 0);
462}
463
464static __inline void
465svm_enable_intercept(struct svm_softc *sc, int vcpu, int off, uint32_t bitmask)
466{
467 svm_set_intercept(sc, vcpu, off, bitmask, 1);
468}
469
470static void
471vmcb_init(struct svm_softc *sc, int vcpu, uint64_t iopm_base_pa,
472 uint64_t msrpm_base_pa, uint64_t np_pml4)
473{
474 struct vmcb_ctrl *ctrl;
475 struct vmcb_state *state;
476 uint32_t mask;
477 int n;
478
479 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
480 state = svm_get_vmcb_state(sc, vcpu);
481
482 ctrl->iopm_base_pa = iopm_base_pa;
483 ctrl->msrpm_base_pa = msrpm_base_pa;
484
485 /* Enable nested paging */
486 ctrl->np_enable = 1;
487 ctrl->n_cr3 = np_pml4;
488
489 /*
490 * Intercept accesses to the control registers that are not shadowed
491 * in the VMCB - i.e. all except cr0, cr2, cr3, cr4 and cr8.
492 */
493 for (n = 0; n < 16; n++) {
494 mask = (BIT(n) << 16) | BIT(n);
495 if (n == 0 || n == 2 || n == 3 || n == 4 || n == 8)
496 svm_disable_intercept(sc, vcpu, VMCB_CR_INTCPT, mask);
497 else
498 svm_enable_intercept(sc, vcpu, VMCB_CR_INTCPT, mask);
499 }
500
501 /* Intercept Machine Check exceptions. */
502 svm_enable_intercept(sc, vcpu, VMCB_EXC_INTCPT, BIT(IDT_MC));
503
504 /* Intercept various events (for e.g. I/O, MSR and CPUID accesses) */
505 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_IO);
506 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_MSR);
507 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_CPUID);
508 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_INTR);
509 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_INIT);
510 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_NMI);
511 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_SMI);
512 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_SHUTDOWN);
513 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
514 VMCB_INTCPT_FERR_FREEZE);
515
516 /*
517 * From section "Canonicalization and Consistency Checks" in APMv2
518 * the VMRUN intercept bit must be set to pass the consistency check.
519 */
520 svm_enable_intercept(sc, vcpu, VMCB_CTRL2_INTCPT, VMCB_INTCPT_VMRUN);
521
522 /*
523 * The ASID will be set to a non-zero value just before VMRUN.
524 */
525 ctrl->asid = 0;
526
527 /*
528 * Section 15.21.1, Interrupt Masking in EFLAGS
529 * Section 15.21.2, Virtualizing APIC.TPR
530 *
531 * This must be set for %rflag and %cr8 isolation of guest and host.
532 */
533 ctrl->v_intr_masking = 1;
534
535 /* Enable Last Branch Record aka LBR for debugging */
536 ctrl->lbr_virt_en = 1;
537 state->dbgctl = BIT(0);
538
539 /* EFER_SVM must always be set when the guest is executing */
540 state->efer = EFER_SVM;
541
542 /* Set up the PAT to power-on state */
543 state->g_pat = PAT_VALUE(0, PAT_WRITE_BACK) |
544 PAT_VALUE(1, PAT_WRITE_THROUGH) |
545 PAT_VALUE(2, PAT_UNCACHED) |
546 PAT_VALUE(3, PAT_UNCACHEABLE) |
547 PAT_VALUE(4, PAT_WRITE_BACK) |
548 PAT_VALUE(5, PAT_WRITE_THROUGH) |
549 PAT_VALUE(6, PAT_UNCACHED) |
550 PAT_VALUE(7, PAT_UNCACHEABLE);
551}
552
553/*
554 * Initialise a virtual machine.
555 */
556static void *
557svm_vminit(struct vm *vm, pmap_t pmap)
558{
559 struct svm_softc *svm_sc;
560 struct svm_vcpu *vcpu;
561 vm_paddr_t msrpm_pa, iopm_pa, pml4_pa;
562 int i;
563
564 svm_sc = (struct svm_softc *)malloc(sizeof (struct svm_softc),
565 M_SVM, M_WAITOK | M_ZERO);
566
567 svm_sc->vm = vm;
568 svm_sc->nptp = (vm_offset_t)vtophys(pmap->pm_pml4);
569
570 /*
571 * Intercept MSR access to all MSRs except GSBASE, FSBASE,... etc.
572 */
573 memset(svm_sc->msr_bitmap, 0xFF, sizeof(svm_sc->msr_bitmap));
574
575 /*
576 * Following MSR can be completely controlled by virtual machines
577 * since access to following are translated to access to VMCB.
578 */
579 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_GSBASE);
580 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_FSBASE);
581 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_KGSBASE);
582
583 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_STAR);
584 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_LSTAR);
585 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_CSTAR);
586 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SF_MASK);
587 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SYSENTER_CS_MSR);
588 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SYSENTER_ESP_MSR);
589 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SYSENTER_EIP_MSR);
590
591 /* For Nested Paging/RVI only. */
592 svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_PAT);
593
594 svm_msr_rd_ok(svm_sc->msr_bitmap, MSR_TSC);
595 svm_msr_rd_ok(svm_sc->msr_bitmap, MSR_EFER);
596
597 /* Intercept access to all I/O ports. */
598 memset(svm_sc->iopm_bitmap, 0xFF, sizeof(svm_sc->iopm_bitmap));
599
600 /* Cache physical address for multiple vcpus. */
601 iopm_pa = vtophys(svm_sc->iopm_bitmap);
602 msrpm_pa = vtophys(svm_sc->msr_bitmap);
603 pml4_pa = svm_sc->nptp;
604
605 for (i = 0; i < VM_MAXCPU; i++) {
606 vcpu = svm_get_vcpu(svm_sc, i);
607 vcpu->lastcpu = NOCPU;
608 vcpu->vmcb_pa = vtophys(&vcpu->vmcb);
609 vmcb_init(svm_sc, i, iopm_pa, msrpm_pa, pml4_pa);
610 svm_msr_guest_init(svm_sc, i);
611 }
612 return (svm_sc);
613}
614
615static int
616svm_cpl(struct vmcb_state *state)
617{
618
619 /*
620 * From APMv2:
621 * "Retrieve the CPL from the CPL field in the VMCB, not
622 * from any segment DPL"
623 */
624 return (state->cpl);
625}
626
627static enum vm_cpu_mode
628svm_vcpu_mode(struct vmcb *vmcb)
629{
630 struct vmcb_segment *seg;
631 struct vmcb_state *state;
632
633 state = &vmcb->state;
634
635 if (state->efer & EFER_LMA) {
636 seg = vmcb_seg(vmcb, VM_REG_GUEST_CS);
637 /*
638 * Section 4.8.1 for APM2, check if Code Segment has
639 * Long attribute set in descriptor.
640 */
641 if (seg->attrib & VMCB_CS_ATTRIB_L)
642 return (CPU_MODE_64BIT);
643 else
644 return (CPU_MODE_COMPATIBILITY);
645 } else if (state->cr0 & CR0_PE) {
646 return (CPU_MODE_PROTECTED);
647 } else {
648 return (CPU_MODE_REAL);
649 }
650}
651
652static enum vm_paging_mode
653svm_paging_mode(uint64_t cr0, uint64_t cr4, uint64_t efer)
654{
655
656 if ((cr0 & CR0_PG) == 0)
657 return (PAGING_MODE_FLAT);
658 if ((cr4 & CR4_PAE) == 0)
659 return (PAGING_MODE_32);
660 if (efer & EFER_LME)
661 return (PAGING_MODE_64);
662 else
663 return (PAGING_MODE_PAE);
664}
665
666/*
667 * ins/outs utility routines
668 */
669static uint64_t
670svm_inout_str_index(struct svm_regctx *regs, int in)
671{
672 uint64_t val;
673
674 val = in ? regs->e.g.sctx_rdi : regs->e.g.sctx_rsi;
675
676 return (val);
677}
678
679static uint64_t
680svm_inout_str_count(struct svm_regctx *regs, int rep)
681{
682 uint64_t val;
683
684 val = rep ? regs->sctx_rcx : 1;
685
686 return (val);
687}
688
689static void
690svm_inout_str_seginfo(struct svm_softc *svm_sc, int vcpu, int64_t info1,
691 int in, struct vm_inout_str *vis)
692{
693 int error, s;
694
695 if (in) {
696 vis->seg_name = VM_REG_GUEST_ES;
697 } else {
698 /* The segment field has standard encoding */
699 s = (info1 >> 10) & 0x7;
700 vis->seg_name = vm_segment_name(s);
701 }
702
703 error = svm_getdesc(svm_sc, vcpu, vis->seg_name, &vis->seg_desc);
704 KASSERT(error == 0, ("%s: svm_getdesc error %d", __func__, error));
705}
706
707static int
708svm_inout_str_addrsize(uint64_t info1)
709{
710 uint32_t size;
711
712 size = (info1 >> 7) & 0x7;
713 switch (size) {
714 case 1:
715 return (2); /* 16 bit */
716 case 2:
717 return (4); /* 32 bit */
718 case 4:
719 return (8); /* 64 bit */
720 default:
721 panic("%s: invalid size encoding %d", __func__, size);
722 }
723}
724
725static void
726svm_paging_info(struct vmcb *vmcb, struct vm_guest_paging *paging)
727{
728 struct vmcb_state *state;
729
730 state = &vmcb->state;
731 paging->cr3 = state->cr3;
732 paging->cpl = svm_cpl(state);
733 paging->cpu_mode = svm_vcpu_mode(vmcb);
734 paging->paging_mode = svm_paging_mode(state->cr0, state->cr4,
735 state->efer);
736}
737
738#define UNHANDLED 0
739
740/*
741 * Handle guest I/O intercept.
742 */
743static int
744svm_handle_io(struct svm_softc *svm_sc, int vcpu, struct vm_exit *vmexit)
745{
746 struct vmcb_ctrl *ctrl;
747 struct vmcb_state *state;
748 struct svm_regctx *regs;
749 struct vm_inout_str *vis;
750 uint64_t info1;
751 int inout_string;
752
753 state = svm_get_vmcb_state(svm_sc, vcpu);
754 ctrl = svm_get_vmcb_ctrl(svm_sc, vcpu);
755 regs = svm_get_guest_regctx(svm_sc, vcpu);
756
757 info1 = ctrl->exitinfo1;
758 inout_string = info1 & BIT(2) ? 1 : 0;
759
760 /*
761 * The effective segment number in EXITINFO1[12:10] is populated
762 * only if the processor has the DecodeAssist capability.
763 *
764 * XXX this is not specified explicitly in APMv2 but can be verified
765 * empirically.
766 */
767 if (inout_string && !decode_assist())
768 return (UNHANDLED);
769
770 vmexit->exitcode = VM_EXITCODE_INOUT;
771 vmexit->u.inout.in = (info1 & BIT(0)) ? 1 : 0;
772 vmexit->u.inout.string = inout_string;
773 vmexit->u.inout.rep = (info1 & BIT(3)) ? 1 : 0;
774 vmexit->u.inout.bytes = (info1 >> 4) & 0x7;
775 vmexit->u.inout.port = (uint16_t)(info1 >> 16);
776 vmexit->u.inout.eax = (uint32_t)(state->rax);
777
778 if (inout_string) {
779 vmexit->exitcode = VM_EXITCODE_INOUT_STR;
780 vis = &vmexit->u.inout_str;
781 svm_paging_info(svm_get_vmcb(svm_sc, vcpu), &vis->paging);
782 vis->rflags = state->rflags;
783 vis->cr0 = state->cr0;
784 vis->index = svm_inout_str_index(regs, vmexit->u.inout.in);
785 vis->count = svm_inout_str_count(regs, vmexit->u.inout.rep);
786 vis->addrsize = svm_inout_str_addrsize(info1);
787 svm_inout_str_seginfo(svm_sc, vcpu, info1,
788 vmexit->u.inout.in, vis);
789 }
790
791 return (UNHANDLED);
792}
793
794static int
795svm_npf_paging(uint64_t exitinfo1)
796{
797
798 if (exitinfo1 & VMCB_NPF_INFO1_W)
799 return (VM_PROT_WRITE);
800
801 return (VM_PROT_READ);
802}
803
804static bool
805svm_npf_emul_fault(uint64_t exitinfo1)
806{
807
808 if (exitinfo1 & VMCB_NPF_INFO1_ID) {
809 return (false);
810 }
811
812 if (exitinfo1 & VMCB_NPF_INFO1_GPT) {
813 return (false);
814 }
815
816 if ((exitinfo1 & VMCB_NPF_INFO1_GPA) == 0) {
817 return (false);
818 }
819
820 return (true);
821}
822
823static void
824svm_handle_inst_emul(struct vmcb *vmcb, uint64_t gpa, struct vm_exit *vmexit)
825{
826 struct vm_guest_paging *paging;
827 struct vmcb_segment *seg;
828 struct vmcb_ctrl *ctrl;
829 char *inst_bytes;
830 int inst_len;
831
832 ctrl = &vmcb->ctrl;
833 paging = &vmexit->u.inst_emul.paging;
834
835 vmexit->exitcode = VM_EXITCODE_INST_EMUL;
836 vmexit->u.inst_emul.gpa = gpa;
837 vmexit->u.inst_emul.gla = VIE_INVALID_GLA;
838 svm_paging_info(vmcb, paging);
839
840 seg = vmcb_seg(vmcb, VM_REG_GUEST_CS);
841 switch(paging->cpu_mode) {
842 case CPU_MODE_PROTECTED:
843 case CPU_MODE_COMPATIBILITY:
844 /*
845 * Section 4.8.1 of APM2, Default Operand Size or D bit.
846 */
847 vmexit->u.inst_emul.cs_d = (seg->attrib & VMCB_CS_ATTRIB_D) ?
848 1 : 0;
849 break;
850 default:
851 vmexit->u.inst_emul.cs_d = 0;
852 break;
853 }
854
855 /*
856 * Copy the instruction bytes into 'vie' if available.
857 */
858 if (decode_assist() && !disable_npf_assist) {
859 inst_len = ctrl->inst_len;
860 inst_bytes = ctrl->inst_bytes;
861 } else {
862 inst_len = 0;
863 inst_bytes = NULL;
864 }
865 vie_init(&vmexit->u.inst_emul.vie, inst_bytes, inst_len);
866}
867
868/*
869 * Intercept access to MSR_EFER to prevent the guest from clearing the
870 * SVM enable bit.
871 */
872static int
873svm_write_efer(struct svm_softc *sc, int vcpu, uint64_t val)
874{
875 struct vmcb_state *state;
876 uint64_t oldval;
877
878 state = svm_get_vmcb_state(sc, vcpu);
879
880 oldval = state->efer;
881 state->efer = val | EFER_SVM;
882 if (state->efer != oldval) {
883 VCPU_CTR2(sc->vm, vcpu, "Guest EFER changed from %#lx to %#lx",
884 oldval, state->efer);
885 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_CR);
886 }
887 return (0);
888}
889
890#ifdef KTR
891static const char *
892intrtype_to_str(int intr_type)
893{
894 switch (intr_type) {
895 case VMCB_EVENTINJ_TYPE_INTR:
896 return ("hwintr");
897 case VMCB_EVENTINJ_TYPE_NMI:
898 return ("nmi");
899 case VMCB_EVENTINJ_TYPE_INTn:
900 return ("swintr");
901 case VMCB_EVENTINJ_TYPE_EXCEPTION:
902 return ("exception");
903 default:
904 panic("%s: unknown intr_type %d", __func__, intr_type);
905 }
906}
907#endif
908
909/*
910 * Inject an event to vcpu as described in section 15.20, "Event injection".
911 */
912static void
913svm_eventinject(struct svm_softc *sc, int vcpu, int intr_type, int vector,
914 uint32_t error, bool ec_valid)
915{
916 struct vmcb_ctrl *ctrl;
917
918 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
919
920 KASSERT((ctrl->eventinj & VMCB_EVENTINJ_VALID) == 0,
921 ("%s: event already pending %#lx", __func__, ctrl->eventinj));
922
923 KASSERT(vector >=0 && vector <= 255, ("%s: invalid vector %d",
924 __func__, vector));
925
926 switch (intr_type) {
927 case VMCB_EVENTINJ_TYPE_INTR:
928 case VMCB_EVENTINJ_TYPE_NMI:
929 case VMCB_EVENTINJ_TYPE_INTn:
930 break;
931 case VMCB_EVENTINJ_TYPE_EXCEPTION:
932 if (vector >= 0 && vector <= 31 && vector != 2)
933 break;
934 /* FALLTHROUGH */
935 default:
936 panic("%s: invalid intr_type/vector: %d/%d", __func__,
937 intr_type, vector);
938 }
939 ctrl->eventinj = vector | (intr_type << 8) | VMCB_EVENTINJ_VALID;
940 if (ec_valid) {
941 ctrl->eventinj |= VMCB_EVENTINJ_EC_VALID;
942 ctrl->eventinj |= (uint64_t)error << 32;
943 VCPU_CTR3(sc->vm, vcpu, "Injecting %s at vector %d errcode %#x",
944 intrtype_to_str(intr_type), vector, error);
945 } else {
946 VCPU_CTR2(sc->vm, vcpu, "Injecting %s at vector %d",
947 intrtype_to_str(intr_type), vector);
948 }
949}
950
951static void
952svm_update_virqinfo(struct svm_softc *sc, int vcpu)
953{
954 struct vm *vm;
955 struct vlapic *vlapic;
956 struct vmcb_ctrl *ctrl;
957 int pending;
958
959 vm = sc->vm;
960 vlapic = vm_lapic(vm, vcpu);
961 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
962
963 /* Update %cr8 in the emulated vlapic */
964 vlapic_set_cr8(vlapic, ctrl->v_tpr);
965
966 /*
967 * If V_IRQ indicates that the interrupt injection attempted on then
968 * last VMRUN was successful then update the vlapic accordingly.
969 */
970 if (ctrl->v_intr_vector != 0) {
971 pending = ctrl->v_irq;
972 KASSERT(ctrl->v_intr_vector >= 16, ("%s: invalid "
973 "v_intr_vector %d", __func__, ctrl->v_intr_vector));
974 KASSERT(!ctrl->v_ign_tpr, ("%s: invalid v_ign_tpr", __func__));
975 VCPU_CTR2(vm, vcpu, "v_intr_vector %d %s", ctrl->v_intr_vector,
976 pending ? "pending" : "accepted");
977 if (!pending)
978 vlapic_intr_accepted(vlapic, ctrl->v_intr_vector);
979 }
980}
981
982static void
983svm_save_intinfo(struct svm_softc *svm_sc, int vcpu)
984{
985 struct vmcb_ctrl *ctrl;
986 uint64_t intinfo;
987
988 ctrl = svm_get_vmcb_ctrl(svm_sc, vcpu);
989 intinfo = ctrl->exitintinfo;
990 if (!VMCB_EXITINTINFO_VALID(intinfo))
991 return;
992
993 /*
994 * From APMv2, Section "Intercepts during IDT interrupt delivery"
995 *
996 * If a #VMEXIT happened during event delivery then record the event
997 * that was being delivered.
998 */
999 VCPU_CTR2(svm_sc->vm, vcpu, "SVM:Pending INTINFO(0x%lx), vector=%d.\n",
1000 intinfo, VMCB_EXITINTINFO_VECTOR(intinfo));
1001 vmm_stat_incr(svm_sc->vm, vcpu, VCPU_EXITINTINFO, 1);
1002 vm_exit_intinfo(svm_sc->vm, vcpu, intinfo);
1003}
1004
1005static __inline int
1006vintr_intercept_enabled(struct svm_softc *sc, int vcpu)
1007{
1008
1009 return (svm_get_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
1010 VMCB_INTCPT_VINTR));
1011}
1012
1013static __inline void
1014enable_intr_window_exiting(struct svm_softc *sc, int vcpu)
1015{
1016 struct vmcb_ctrl *ctrl;
1017
1018 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1019
1020 if (ctrl->v_irq && ctrl->v_intr_vector == 0) {
1021 KASSERT(ctrl->v_ign_tpr, ("%s: invalid v_ign_tpr", __func__));
1022 KASSERT(vintr_intercept_enabled(sc, vcpu),
1023 ("%s: vintr intercept should be enabled", __func__));
1024 return;
1025 }
1026
1027 VCPU_CTR0(sc->vm, vcpu, "Enable intr window exiting");
1028 ctrl->v_irq = 1;
1029 ctrl->v_ign_tpr = 1;
1030 ctrl->v_intr_vector = 0;
1031 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_TPR);
1032 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_VINTR);
1033}
1034
1035static __inline void
1036disable_intr_window_exiting(struct svm_softc *sc, int vcpu)
1037{
1038 struct vmcb_ctrl *ctrl;
1039
1040 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1041
1042 if (!ctrl->v_irq && ctrl->v_intr_vector == 0) {
1043 KASSERT(!vintr_intercept_enabled(sc, vcpu),
1044 ("%s: vintr intercept should be disabled", __func__));
1045 return;
1046 }
1047
1048#ifdef KTR
1049 if (ctrl->v_intr_vector == 0)
1050 VCPU_CTR0(sc->vm, vcpu, "Disable intr window exiting");
1051 else
1052 VCPU_CTR0(sc->vm, vcpu, "Clearing V_IRQ interrupt injection");
1053#endif
1054 ctrl->v_irq = 0;
1055 ctrl->v_intr_vector = 0;
1056 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_TPR);
1057 svm_disable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_VINTR);
1058}
1059
1060static int
1061svm_modify_intr_shadow(struct svm_softc *sc, int vcpu, uint64_t val)
1062{
1063 struct vmcb_ctrl *ctrl;
1064 int oldval, newval;
1065
1066 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1067 oldval = ctrl->intr_shadow;
1068 newval = val ? 1 : 0;
1069 if (newval != oldval) {
1070 ctrl->intr_shadow = newval;
1071 VCPU_CTR1(sc->vm, vcpu, "Setting intr_shadow to %d", newval);
1072 }
1073 return (0);
1074}
1075
1076static int
1077svm_get_intr_shadow(struct svm_softc *sc, int vcpu, uint64_t *val)
1078{
1079 struct vmcb_ctrl *ctrl;
1080
1081 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1082 *val = ctrl->intr_shadow;
1083 return (0);
1084}
1085
1086/*
1087 * Once an NMI is injected it blocks delivery of further NMIs until the handler
1088 * executes an IRET. The IRET intercept is enabled when an NMI is injected to
1089 * to track when the vcpu is done handling the NMI.
1090 */
1091static int
1092nmi_blocked(struct svm_softc *sc, int vcpu)
1093{
1094 int blocked;
1095
1096 blocked = svm_get_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
1097 VMCB_INTCPT_IRET);
1098 return (blocked);
1099}
1100
1101static void
1102enable_nmi_blocking(struct svm_softc *sc, int vcpu)
1103{
1104
1105 KASSERT(!nmi_blocked(sc, vcpu), ("vNMI already blocked"));
1106 VCPU_CTR0(sc->vm, vcpu, "vNMI blocking enabled");
1107 svm_enable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_IRET);
1108}
1109
1110static void
1111clear_nmi_blocking(struct svm_softc *sc, int vcpu)
1112{
1113 int error;
1114
1115 KASSERT(nmi_blocked(sc, vcpu), ("vNMI already unblocked"));
1116 VCPU_CTR0(sc->vm, vcpu, "vNMI blocking cleared");
1117 /*
1118 * When the IRET intercept is cleared the vcpu will attempt to execute
1119 * the "iret" when it runs next. However, it is possible to inject
1120 * another NMI into the vcpu before the "iret" has actually executed.
1121 *
1122 * For e.g. if the "iret" encounters a #NPF when accessing the stack
1123 * it will trap back into the hypervisor. If an NMI is pending for
1124 * the vcpu it will be injected into the guest.
1125 *
1126 * XXX this needs to be fixed
1127 */
1128 svm_disable_intercept(sc, vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_IRET);
1129
1130 /*
1131 * Set 'intr_shadow' to prevent an NMI from being injected on the
1132 * immediate VMRUN.
1133 */
1134 error = svm_modify_intr_shadow(sc, vcpu, 1);
1135 KASSERT(!error, ("%s: error %d setting intr_shadow", __func__, error));
1136}
1137
1138static int
1139emulate_wrmsr(struct svm_softc *sc, int vcpu, u_int num, uint64_t val,
1140 bool *retu)
1141{
1142 int error;
1143
1144 if (lapic_msr(num))
1145 error = lapic_wrmsr(sc->vm, vcpu, num, val, retu);
1146 else if (num == MSR_EFER)
1147 error = svm_write_efer(sc, vcpu, val);
1148 else
1149 error = svm_wrmsr(sc, vcpu, num, val, retu);
1150
1151 return (error);
1152}
1153
1154static int
1155emulate_rdmsr(struct svm_softc *sc, int vcpu, u_int num, bool *retu)
1156{
1157 struct vmcb_state *state;
1158 struct svm_regctx *ctx;
1159 uint64_t result;
1160 int error;
1161
1162 if (lapic_msr(num))
1163 error = lapic_rdmsr(sc->vm, vcpu, num, &result, retu);
1164 else
1165 error = svm_rdmsr(sc, vcpu, num, &result, retu);
1166
1167 if (error == 0) {
1168 state = svm_get_vmcb_state(sc, vcpu);
1169 ctx = svm_get_guest_regctx(sc, vcpu);
1170 state->rax = result & 0xffffffff;
1171 ctx->e.g.sctx_rdx = result >> 32;
1172 }
1173
1174 return (error);
1175}
1176
1177#ifdef KTR
1178static const char *
1179exit_reason_to_str(uint64_t reason)
1180{
1181 static char reasonbuf[32];
1182
1183 switch (reason) {
1184 case VMCB_EXIT_INVALID:
1185 return ("invalvmcb");
1186 case VMCB_EXIT_SHUTDOWN:
1187 return ("shutdown");
1188 case VMCB_EXIT_NPF:
1189 return ("nptfault");
1190 case VMCB_EXIT_PAUSE:
1191 return ("pause");
1192 case VMCB_EXIT_HLT:
1193 return ("hlt");
1194 case VMCB_EXIT_CPUID:
1195 return ("cpuid");
1196 case VMCB_EXIT_IO:
1197 return ("inout");
1198 case VMCB_EXIT_MC:
1199 return ("mchk");
1200 case VMCB_EXIT_INTR:
1201 return ("extintr");
1202 case VMCB_EXIT_NMI:
1203 return ("nmi");
1204 case VMCB_EXIT_VINTR:
1205 return ("vintr");
1206 case VMCB_EXIT_MSR:
1207 return ("msr");
1208 case VMCB_EXIT_IRET:
1209 return ("iret");
1210 default:
1211 snprintf(reasonbuf, sizeof(reasonbuf), "%#lx", reason);
1212 return (reasonbuf);
1213 }
1214}
1215#endif /* KTR */
1216
1217/*
1218 * From section "State Saved on Exit" in APMv2: nRIP is saved for all #VMEXITs
1219 * that are due to instruction intercepts as well as MSR and IOIO intercepts
1220 * and exceptions caused by INT3, INTO and BOUND instructions.
1221 *
1222 * Return 1 if the nRIP is valid and 0 otherwise.
1223 */
1224static int
1225nrip_valid(uint64_t exitcode)
1226{
1227 switch (exitcode) {
1228 case 0x00 ... 0x0F: /* read of CR0 through CR15 */
1229 case 0x10 ... 0x1F: /* write of CR0 through CR15 */
1230 case 0x20 ... 0x2F: /* read of DR0 through DR15 */
1231 case 0x30 ... 0x3F: /* write of DR0 through DR15 */
1232 case 0x43: /* INT3 */
1233 case 0x44: /* INTO */
1234 case 0x45: /* BOUND */
1235 case 0x65 ... 0x7C: /* VMEXIT_CR0_SEL_WRITE ... VMEXIT_MSR */
1236 case 0x80 ... 0x8D: /* VMEXIT_VMRUN ... VMEXIT_XSETBV */
1237 return (1);
1238 default:
1239 return (0);
1240 }
1241}
1242
1243/*
1244 * Collateral for a generic SVM VM-exit.
1245 */
1246static void
1247vm_exit_svm(struct vm_exit *vme, uint64_t code, uint64_t info1, uint64_t info2)
1248{
1249
1250 vme->exitcode = VM_EXITCODE_SVM;
1251 vme->u.svm.exitcode = code;
1252 vme->u.svm.exitinfo1 = info1;
1253 vme->u.svm.exitinfo2 = info2;
1254}
1255
1256static int
1257svm_vmexit(struct svm_softc *svm_sc, int vcpu, struct vm_exit *vmexit)
1258{
1259 struct vmcb *vmcb;
1260 struct vmcb_state *state;
1261 struct vmcb_ctrl *ctrl;
1262 struct svm_regctx *ctx;
1263 uint64_t code, info1, info2, val;
1264 uint32_t eax, ecx, edx;
1265 int handled;
1266 bool retu;
1267
1268 ctx = svm_get_guest_regctx(svm_sc, vcpu);
1269 vmcb = svm_get_vmcb(svm_sc, vcpu);
1270 state = &vmcb->state;
1271 ctrl = &vmcb->ctrl;
1272
1273 handled = 0;
1274 code = ctrl->exitcode;
1275 info1 = ctrl->exitinfo1;
1276 info2 = ctrl->exitinfo2;
1277
1278 vmexit->exitcode = VM_EXITCODE_BOGUS;
1279 vmexit->rip = state->rip;
1280 vmexit->inst_length = nrip_valid(code) ? ctrl->nrip - state->rip : 0;
1281
1282 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_COUNT, 1);
1283
1284 /*
1285 * #VMEXIT(INVALID) needs to be handled early because the VMCB is
1286 * in an inconsistent state and can trigger assertions that would
1287 * never happen otherwise.
1288 */
1289 if (code == VMCB_EXIT_INVALID) {
1290 vm_exit_svm(vmexit, code, info1, info2);
1291 return (0);
1292 }
1293
1294 KASSERT((ctrl->eventinj & VMCB_EVENTINJ_VALID) == 0, ("%s: event "
1295 "injection valid bit is set %#lx", __func__, ctrl->eventinj));
1296
1297 KASSERT(vmexit->inst_length >= 0 && vmexit->inst_length <= 15,
1298 ("invalid inst_length %d: code (%#lx), info1 (%#lx), info2 (%#lx)",
1299 vmexit->inst_length, code, info1, info2));
1300
1301 svm_update_virqinfo(svm_sc, vcpu);
1302 svm_save_intinfo(svm_sc, vcpu);
1303
1304 switch (code) {
1305 case VMCB_EXIT_IRET:
1306 /*
1307 * Restart execution at "iret" but with the intercept cleared.
1308 */
1309 vmexit->inst_length = 0;
1310 clear_nmi_blocking(svm_sc, vcpu);
1311 handled = 1;
1312 break;
1313 case VMCB_EXIT_VINTR: /* interrupt window exiting */
1314 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_VINTR, 1);
1315 handled = 1;
1316 break;
1317 case VMCB_EXIT_INTR: /* external interrupt */
1318 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_EXTINT, 1);
1319 handled = 1;
1320 break;
1321 case VMCB_EXIT_NMI: /* external NMI */
1322 handled = 1;
1323 break;
1324 case VMCB_EXIT_MC: /* machine check */
1325 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_EXCEPTION, 1);
1326 break;
1327 case VMCB_EXIT_MSR: /* MSR access. */
1328 eax = state->rax;
1329 ecx = ctx->sctx_rcx;
1330 edx = ctx->e.g.sctx_rdx;
1331 retu = false;
1332
1333 if (info1) {
1334 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_WRMSR, 1);
1335 val = (uint64_t)edx << 32 | eax;
1336 VCPU_CTR2(svm_sc->vm, vcpu, "wrmsr %#x val %#lx",
1337 ecx, val);
1338 if (emulate_wrmsr(svm_sc, vcpu, ecx, val, &retu)) {
1339 vmexit->exitcode = VM_EXITCODE_WRMSR;
1340 vmexit->u.msr.code = ecx;
1341 vmexit->u.msr.wval = val;
1342 } else if (!retu) {
1343 handled = 1;
1344 } else {
1345 KASSERT(vmexit->exitcode != VM_EXITCODE_BOGUS,
1346 ("emulate_wrmsr retu with bogus exitcode"));
1347 }
1348 } else {
1349 VCPU_CTR1(svm_sc->vm, vcpu, "rdmsr %#x", ecx);
1350 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_RDMSR, 1);
1351 if (emulate_rdmsr(svm_sc, vcpu, ecx, &retu)) {
1352 vmexit->exitcode = VM_EXITCODE_RDMSR;
1353 vmexit->u.msr.code = ecx;
1354 } else if (!retu) {
1355 handled = 1;
1356 } else {
1357 KASSERT(vmexit->exitcode != VM_EXITCODE_BOGUS,
1358 ("emulate_rdmsr retu with bogus exitcode"));
1359 }
1360 }
1361 break;
1362 case VMCB_EXIT_IO:
1363 handled = svm_handle_io(svm_sc, vcpu, vmexit);
1364 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_INOUT, 1);
1365 break;
1366 case VMCB_EXIT_CPUID:
1367 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_CPUID, 1);
1368 handled = x86_emulate_cpuid(svm_sc->vm, vcpu,
1369 (uint32_t *)&state->rax,
1370 (uint32_t *)&ctx->sctx_rbx,
1371 (uint32_t *)&ctx->sctx_rcx,
1372 (uint32_t *)&ctx->e.g.sctx_rdx);
1373 break;
1374 case VMCB_EXIT_HLT:
1375 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_HLT, 1);
1376 vmexit->exitcode = VM_EXITCODE_HLT;
1377 vmexit->u.hlt.rflags = state->rflags;
1378 break;
1379 case VMCB_EXIT_PAUSE:
1380 vmexit->exitcode = VM_EXITCODE_PAUSE;
1381 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_PAUSE, 1);
1382 break;
1383 case VMCB_EXIT_NPF:
1384 /* EXITINFO2 contains the faulting guest physical address */
1385 if (info1 & VMCB_NPF_INFO1_RSV) {
1386 VCPU_CTR2(svm_sc->vm, vcpu, "nested page fault with "
1387 "reserved bits set: info1(%#lx) info2(%#lx)",
1388 info1, info2);
1389 } else if (vm_mem_allocated(svm_sc->vm, info2)) {
1390 vmexit->exitcode = VM_EXITCODE_PAGING;
1391 vmexit->u.paging.gpa = info2;
1392 vmexit->u.paging.fault_type = svm_npf_paging(info1);
1393 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_NESTED_FAULT, 1);
1394 VCPU_CTR3(svm_sc->vm, vcpu, "nested page fault "
1395 "on gpa %#lx/%#lx at rip %#lx",
1396 info2, info1, state->rip);
1397 } else if (svm_npf_emul_fault(info1)) {
1398 svm_handle_inst_emul(vmcb, info2, vmexit);
1399 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_INST_EMUL, 1);
1400 VCPU_CTR3(svm_sc->vm, vcpu, "inst_emul fault "
1401 "for gpa %#lx/%#lx at rip %#lx",
1402 info2, info1, state->rip);
1403 }
1404 break;
1405 default:
1406 vmm_stat_incr(svm_sc->vm, vcpu, VMEXIT_UNKNOWN, 1);
1407 break;
1408 }
1409
1410 VCPU_CTR4(svm_sc->vm, vcpu, "%s %s vmexit at %#lx/%d",
1411 handled ? "handled" : "unhandled", exit_reason_to_str(code),
1412 vmexit->rip, vmexit->inst_length);
1413
1414 if (handled) {
1415 vmexit->rip += vmexit->inst_length;
1416 vmexit->inst_length = 0;
1417 state->rip = vmexit->rip;
1418 } else {
1419 if (vmexit->exitcode == VM_EXITCODE_BOGUS) {
1420 /*
1421 * If this VM exit was not claimed by anybody then
1422 * treat it as a generic SVM exit.
1423 */
1424 vm_exit_svm(vmexit, code, info1, info2);
1425 } else {
1426 /*
1427 * The exitcode and collateral have been populated.
1428 * The VM exit will be processed further in userland.
1429 */
1430 }
1431 }
1432 return (handled);
1433}
1434
1435static void
1436svm_inj_intinfo(struct svm_softc *svm_sc, int vcpu)
1437{
1438 uint64_t intinfo;
1439
1440 if (!vm_entry_intinfo(svm_sc->vm, vcpu, &intinfo))
1441 return;
1442
1443 KASSERT(VMCB_EXITINTINFO_VALID(intinfo), ("%s: entry intinfo is not "
1444 "valid: %#lx", __func__, intinfo));
1445
1446 svm_eventinject(svm_sc, vcpu, VMCB_EXITINTINFO_TYPE(intinfo),
1447 VMCB_EXITINTINFO_VECTOR(intinfo),
1448 VMCB_EXITINTINFO_EC(intinfo),
1449 VMCB_EXITINTINFO_EC_VALID(intinfo));
1450 vmm_stat_incr(svm_sc->vm, vcpu, VCPU_INTINFO_INJECTED, 1);
1451 VCPU_CTR1(svm_sc->vm, vcpu, "Injected entry intinfo: %#lx", intinfo);
1452}
1453
1454/*
1455 * Inject event to virtual cpu.
1456 */
1457static void
1458svm_inj_interrupts(struct svm_softc *sc, int vcpu, struct vlapic *vlapic)
1459{
1460 struct vmcb_ctrl *ctrl;
1461 struct vmcb_state *state;
1462 uint8_t v_tpr;
1463 int vector, need_intr_window, pending_apic_vector;
1464
1465 state = svm_get_vmcb_state(sc, vcpu);
1466 ctrl = svm_get_vmcb_ctrl(sc, vcpu);
1467
1468 need_intr_window = 0;
1469 pending_apic_vector = 0;
1470
1471 /*
1472 * Inject pending events or exceptions for this vcpu.
1473 *
1474 * An event might be pending because the previous #VMEXIT happened
1475 * during event delivery (i.e. ctrl->exitintinfo).
1476 *
1477 * An event might also be pending because an exception was injected
1478 * by the hypervisor (e.g. #PF during instruction emulation).
1479 */
1480 svm_inj_intinfo(sc, vcpu);
1481
1482 /* NMI event has priority over interrupts. */
1483 if (vm_nmi_pending(sc->vm, vcpu)) {
1484 if (nmi_blocked(sc, vcpu)) {
1485 /*
1486 * Can't inject another NMI if the guest has not
1487 * yet executed an "iret" after the last NMI.
1488 */
1489 VCPU_CTR0(sc->vm, vcpu, "Cannot inject NMI due "
1490 "to NMI-blocking");
1491 } else if (ctrl->intr_shadow) {
1492 /*
1493 * Can't inject an NMI if the vcpu is in an intr_shadow.
1494 */
1495 VCPU_CTR0(sc->vm, vcpu, "Cannot inject NMI due to "
1496 "interrupt shadow");
1497 need_intr_window = 1;
1498 goto done;
1499 } else if (ctrl->eventinj & VMCB_EVENTINJ_VALID) {
1500 /*
1501 * If there is already an exception/interrupt pending
1502 * then defer the NMI until after that.
1503 */
1504 VCPU_CTR1(sc->vm, vcpu, "Cannot inject NMI due to "
1505 "eventinj %#lx", ctrl->eventinj);
1506
1507 /*
1508 * Use self-IPI to trigger a VM-exit as soon as
1509 * possible after the event injection is completed.
1510 *
1511 * This works only if the external interrupt exiting
1512 * is at a lower priority than the event injection.
1513 *
1514 * Although not explicitly specified in APMv2 the
1515 * relative priorities were verified empirically.
1516 */
1517 ipi_cpu(curcpu, IPI_AST); /* XXX vmm_ipinum? */
1518 } else {
1519 vm_nmi_clear(sc->vm, vcpu);
1520
1521 /* Inject NMI, vector number is not used */
1522 svm_eventinject(sc, vcpu, VMCB_EVENTINJ_TYPE_NMI,
1523 IDT_NMI, 0, false);
1524
1525 /* virtual NMI blocking is now in effect */
1526 enable_nmi_blocking(sc, vcpu);
1527
1528 VCPU_CTR0(sc->vm, vcpu, "Injecting vNMI");
1529 }
1530 }
1531
1532 if (!vm_extint_pending(sc->vm, vcpu)) {
1533 /*
1534 * APIC interrupts are delivered using the V_IRQ offload.
1535 *
1536 * The primary benefit is that the hypervisor doesn't need to
1537 * deal with the various conditions that inhibit interrupts.
1538 * It also means that TPR changes via CR8 will be handled
1539 * without any hypervisor involvement.
1540 *
1541 * Note that the APIC vector must remain pending in the vIRR
1542 * until it is confirmed that it was delivered to the guest.
1543 * This can be confirmed based on the value of V_IRQ at the
1544 * next #VMEXIT (1 = pending, 0 = delivered).
1545 *
1546 * Also note that it is possible that another higher priority
1547 * vector can become pending before this vector is delivered
1548 * to the guest. This is alright because vcpu_notify_event()
1549 * will send an IPI and force the vcpu to trap back into the
1550 * hypervisor. The higher priority vector will be injected on
1551 * the next VMRUN.
1552 */
1553 if (vlapic_pending_intr(vlapic, &vector)) {
1554 KASSERT(vector >= 16 && vector <= 255,
1555 ("invalid vector %d from local APIC", vector));
1556 pending_apic_vector = vector;
1557 }
1558 goto done;
1559 }
1560
1561 /* Ask the legacy pic for a vector to inject */
1562 vatpic_pending_intr(sc->vm, &vector);
1563 KASSERT(vector >= 0 && vector <= 255, ("invalid vector %d from INTR",
1564 vector));
1565
1566 /*
1567 * If the guest has disabled interrupts or is in an interrupt shadow
1568 * then we cannot inject the pending interrupt.
1569 */
1570 if ((state->rflags & PSL_I) == 0) {
1571 VCPU_CTR2(sc->vm, vcpu, "Cannot inject vector %d due to "
1572 "rflags %#lx", vector, state->rflags);
1573 need_intr_window = 1;
1574 goto done;
1575 }
1576
1577 if (ctrl->intr_shadow) {
1578 VCPU_CTR1(sc->vm, vcpu, "Cannot inject vector %d due to "
1579 "interrupt shadow", vector);
1580 need_intr_window = 1;
1581 goto done;
1582 }
1583
1584 if (ctrl->eventinj & VMCB_EVENTINJ_VALID) {
1585 VCPU_CTR2(sc->vm, vcpu, "Cannot inject vector %d due to "
1586 "eventinj %#lx", vector, ctrl->eventinj);
1587 need_intr_window = 1;
1588 goto done;
1589 }
1590
1591 /*
1592 * Legacy PIC interrupts are delivered via the event injection
1593 * mechanism.
1594 */
1595 svm_eventinject(sc, vcpu, VMCB_EVENTINJ_TYPE_INTR, vector, 0, false);
1596
1597 vm_extint_clear(sc->vm, vcpu);
1598 vatpic_intr_accepted(sc->vm, vector);
1599
1600 /*
1601 * Force a VM-exit as soon as the vcpu is ready to accept another
1602 * interrupt. This is done because the PIC might have another vector
1603 * that it wants to inject. Also, if the APIC has a pending interrupt
1604 * that was preempted by the ExtInt then it allows us to inject the
1605 * APIC vector as soon as possible.
1606 */
1607 need_intr_window = 1;
1608done:
1609 /*
1610 * The guest can modify the TPR by writing to %CR8. In guest mode
1611 * the processor reflects this write to V_TPR without hypervisor
1612 * intervention.
1613 *
1614 * The guest can also modify the TPR by writing to it via the memory
1615 * mapped APIC page. In this case, the write will be emulated by the
1616 * hypervisor. For this reason V_TPR must be updated before every
1617 * VMRUN.
1618 */
1619 v_tpr = vlapic_get_cr8(vlapic);
1620 KASSERT(v_tpr >= 0 && v_tpr <= 15, ("invalid v_tpr %#x", v_tpr));
1621 if (ctrl->v_tpr != v_tpr) {
1622 VCPU_CTR2(sc->vm, vcpu, "VMCB V_TPR changed from %#x to %#x",
1623 ctrl->v_tpr, v_tpr);
1624 ctrl->v_tpr = v_tpr;
1625 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_TPR);
1626 }
1627
1628 if (pending_apic_vector) {
1629 /*
1630 * If an APIC vector is being injected then interrupt window
1631 * exiting is not possible on this VMRUN.
1632 */
1633 KASSERT(!need_intr_window, ("intr_window exiting impossible"));
1634 VCPU_CTR1(sc->vm, vcpu, "Injecting vector %d using V_IRQ",
1635 pending_apic_vector);
1636
1637 ctrl->v_irq = 1;
1638 ctrl->v_ign_tpr = 0;
1639 ctrl->v_intr_vector = pending_apic_vector;
1640 ctrl->v_intr_prio = pending_apic_vector >> 4;
1641 vcpu_set_dirty(sc, vcpu, VMCB_CACHE_TPR);
1642 } else if (need_intr_window) {
1643 /*
1644 * We use V_IRQ in conjunction with the VINTR intercept to
1645 * trap into the hypervisor as soon as a virtual interrupt
1646 * can be delivered.
1647 *
1648 * Since injected events are not subject to intercept checks
1649 * we need to ensure that the V_IRQ is not actually going to
1650 * be delivered on VM entry. The KASSERT below enforces this.
1651 */
1652 KASSERT((ctrl->eventinj & VMCB_EVENTINJ_VALID) != 0 ||
1653 (state->rflags & PSL_I) == 0 || ctrl->intr_shadow,
1654 ("Bogus intr_window_exiting: eventinj (%#lx), "
1655 "intr_shadow (%u), rflags (%#lx)",
1656 ctrl->eventinj, ctrl->intr_shadow, state->rflags));
1657 enable_intr_window_exiting(sc, vcpu);
1658 } else {
1659 disable_intr_window_exiting(sc, vcpu);
1660 }
1661}
1662
1663static __inline void
1664restore_host_tss(void)
1665{
1666 struct system_segment_descriptor *tss_sd;
1667
1668 /*
1669 * The TSS descriptor was in use prior to launching the guest so it
1670 * has been marked busy.
1671 *
1672 * 'ltr' requires the descriptor to be marked available so change the
1673 * type to "64-bit available TSS".
1674 */
1675 tss_sd = PCPU_GET(tss);
1676 tss_sd->sd_type = SDT_SYSTSS;
1677 ltr(GSEL(GPROC0_SEL, SEL_KPL));
1678}
1679
1680static void
1681check_asid(struct svm_softc *sc, int vcpuid, pmap_t pmap, u_int thiscpu)
1682{
1683 struct svm_vcpu *vcpustate;
1684 struct vmcb_ctrl *ctrl;
1685 long eptgen;
1686 bool alloc_asid;
1687
1688 KASSERT(CPU_ISSET(thiscpu, &pmap->pm_active), ("%s: nested pmap not "
1689 "active on cpu %u", __func__, thiscpu));
1690
1691 vcpustate = svm_get_vcpu(sc, vcpuid);
1692 ctrl = svm_get_vmcb_ctrl(sc, vcpuid);
1693
1694 /*
1695 * The TLB entries associated with the vcpu's ASID are not valid
1696 * if either of the following conditions is true:
1697 *
1698 * 1. The vcpu's ASID generation is different than the host cpu's
1699 * ASID generation. This happens when the vcpu migrates to a new
1700 * host cpu. It can also happen when the number of vcpus executing
1701 * on a host cpu is greater than the number of ASIDs available.
1702 *
1703 * 2. The pmap generation number is different than the value cached in
1704 * the 'vcpustate'. This happens when the host invalidates pages
1705 * belonging to the guest.
1706 *
1707 * asidgen eptgen Action
1708 * mismatch mismatch
1709 * 0 0 (a)
1710 * 0 1 (b1) or (b2)
1711 * 1 0 (c)
1712 * 1 1 (d)
1713 *
1714 * (a) There is no mismatch in eptgen or ASID generation and therefore
1715 * no further action is needed.
1716 *
1717 * (b1) If the cpu supports FlushByAsid then the vcpu's ASID is
1718 * retained and the TLB entries associated with this ASID
1719 * are flushed by VMRUN.
1720 *
1721 * (b2) If the cpu does not support FlushByAsid then a new ASID is
1722 * allocated.
1723 *
1724 * (c) A new ASID is allocated.
1725 *
1726 * (d) A new ASID is allocated.
1727 */
1728
1729 alloc_asid = false;
1730 eptgen = pmap->pm_eptgen;
1731 ctrl->tlb_ctrl = VMCB_TLB_FLUSH_NOTHING;
1732
1733 if (vcpustate->asid.gen != asid[thiscpu].gen) {
1734 alloc_asid = true; /* (c) and (d) */
1735 } else if (vcpustate->eptgen != eptgen) {
1736 if (flush_by_asid())
1737 ctrl->tlb_ctrl = VMCB_TLB_FLUSH_GUEST; /* (b1) */
1738 else
1739 alloc_asid = true; /* (b2) */
1740 } else {
1741 /*
1742 * This is the common case (a).
1743 */
1744 KASSERT(!alloc_asid, ("ASID allocation not necessary"));
1745 KASSERT(ctrl->tlb_ctrl == VMCB_TLB_FLUSH_NOTHING,
1746 ("Invalid VMCB tlb_ctrl: %#x", ctrl->tlb_ctrl));
1747 }
1748
1749 if (alloc_asid) {
1750 if (++asid[thiscpu].num >= nasid) {
1751 asid[thiscpu].num = 1;
1752 if (++asid[thiscpu].gen == 0)
1753 asid[thiscpu].gen = 1;
1754 /*
1755 * If this cpu does not support "flush-by-asid"
1756 * then flush the entire TLB on a generation
1757 * bump. Subsequent ASID allocation in this
1758 * generation can be done without a TLB flush.
1759 */
1760 if (!flush_by_asid())
1761 ctrl->tlb_ctrl = VMCB_TLB_FLUSH_ALL;
1762 }
1763 vcpustate->asid.gen = asid[thiscpu].gen;
1764 vcpustate->asid.num = asid[thiscpu].num;
1765
1766 ctrl->asid = vcpustate->asid.num;
1767 vcpu_set_dirty(sc, vcpuid, VMCB_CACHE_ASID);
1768 /*
1769 * If this cpu supports "flush-by-asid" then the TLB
1770 * was not flushed after the generation bump. The TLB
1771 * is flushed selectively after every new ASID allocation.
1772 */
1773 if (flush_by_asid())
1774 ctrl->tlb_ctrl = VMCB_TLB_FLUSH_GUEST;
1775 }
1776 vcpustate->eptgen = eptgen;
1777
1778 KASSERT(ctrl->asid != 0, ("Guest ASID must be non-zero"));
1779 KASSERT(ctrl->asid == vcpustate->asid.num,
1780 ("ASID mismatch: %u/%u", ctrl->asid, vcpustate->asid.num));
1781}
1782
1783/*
1784 * Start vcpu with specified RIP.
1785 */
1786static int
1787svm_vmrun(void *arg, int vcpu, register_t rip, pmap_t pmap,
1788 void *rend_cookie, void *suspended_cookie)
1789{
1790 struct svm_regctx *hctx, *gctx;
1791 struct svm_softc *svm_sc;
1792 struct svm_vcpu *vcpustate;
1793 struct vmcb_state *state;
1794 struct vmcb_ctrl *ctrl;
1795 struct vm_exit *vmexit;
1796 struct vlapic *vlapic;
1797 struct vm *vm;
1798 uint64_t vmcb_pa;
1799 u_int thiscpu;
1800 int handled;
1801
1802 svm_sc = arg;
1803 vm = svm_sc->vm;
1804
1805 vcpustate = svm_get_vcpu(svm_sc, vcpu);
1806 state = svm_get_vmcb_state(svm_sc, vcpu);
1807 ctrl = svm_get_vmcb_ctrl(svm_sc, vcpu);
1808 vmexit = vm_exitinfo(vm, vcpu);
1809 vlapic = vm_lapic(vm, vcpu);
1810
1811 /*
1812 * Stash 'curcpu' on the stack as 'thiscpu'.
1813 *
1814 * The per-cpu data area is not accessible until MSR_GSBASE is restored
1815 * after the #VMEXIT. Since VMRUN is executed inside a critical section
1816 * 'curcpu' and 'thiscpu' are guaranteed to identical.
1817 */
1818 thiscpu = curcpu;
1819
1820 gctx = svm_get_guest_regctx(svm_sc, vcpu);
1821 hctx = &host_ctx[thiscpu];
1822 vmcb_pa = svm_sc->vcpu[vcpu].vmcb_pa;
1823
1824 if (vcpustate->lastcpu != thiscpu) {
1825 /*
1826 * Force new ASID allocation by invalidating the generation.
1827 */
1828 vcpustate->asid.gen = 0;
1829
1830 /*
1831 * Invalidate the VMCB state cache by marking all fields dirty.
1832 */
1833 vcpu_set_dirty(svm_sc, vcpu, 0xffffffff);
1834
1835 /*
1836 * XXX
1837 * Setting 'vcpustate->lastcpu' here is bit premature because
1838 * we may return from this function without actually executing
1839 * the VMRUN instruction. This could happen if a rendezvous
1840 * or an AST is pending on the first time through the loop.
1841 *
1842 * This works for now but any new side-effects of vcpu
1843 * migration should take this case into account.
1844 */
1845 vcpustate->lastcpu = thiscpu;
1846 vmm_stat_incr(vm, vcpu, VCPU_MIGRATIONS, 1);
1847 }
1848
1849 svm_msr_guest_enter(svm_sc, vcpu);
1850
1851 /* Update Guest RIP */
1852 state->rip = rip;
1853
1854 do {
1855 /*
1856 * Disable global interrupts to guarantee atomicity during
1857 * loading of guest state. This includes not only the state
1858 * loaded by the "vmrun" instruction but also software state
1859 * maintained by the hypervisor: suspended and rendezvous
1860 * state, NPT generation number, vlapic interrupts etc.
1861 */
1862 disable_gintr();
1863
1864 if (vcpu_suspended(suspended_cookie)) {
1865 enable_gintr();
1866 vm_exit_suspended(vm, vcpu, state->rip);
1867 break;
1868 }
1869
1870 if (vcpu_rendezvous_pending(rend_cookie)) {
1871 enable_gintr();
1872 vm_exit_rendezvous(vm, vcpu, state->rip);
1873 break;
1874 }
1875
1876 /* We are asked to give the cpu by scheduler. */
1877 if (curthread->td_flags & (TDF_ASTPENDING | TDF_NEEDRESCHED)) {
1878 enable_gintr();
1879 vm_exit_astpending(vm, vcpu, state->rip);
1880 break;
1881 }
1882
1883 svm_inj_interrupts(svm_sc, vcpu, vlapic);
1884
1885 /* Activate the nested pmap on 'thiscpu' */
1886 CPU_SET_ATOMIC_ACQ(thiscpu, &pmap->pm_active);
1887
1888 /*
1889 * Check the pmap generation and the ASID generation to
1890 * ensure that the vcpu does not use stale TLB mappings.
1891 */
1892 check_asid(svm_sc, vcpu, pmap, thiscpu);
1893
1894 ctrl->vmcb_clean = VMCB_CACHE_DEFAULT & ~vcpustate->dirty;
1895 vcpustate->dirty = 0;
1896 VCPU_CTR1(vm, vcpu, "vmcb clean %#x", ctrl->vmcb_clean);
1897
1898 /* Launch Virtual Machine. */
1899 VCPU_CTR1(vm, vcpu, "Resume execution at %#lx", state->rip);
1900 svm_launch(vmcb_pa, gctx, hctx);
1901
1902 CPU_CLR_ATOMIC(thiscpu, &pmap->pm_active);
1903
1904 /*
1905 * Restore MSR_GSBASE to point to the pcpu data area.
1906 *
1907 * Note that accesses done via PCPU_GET/PCPU_SET will work
1908 * only after MSR_GSBASE is restored.
1909 *
1910 * Also note that we don't bother restoring MSR_KGSBASE
1911 * since it is not used in the kernel and will be restored
1912 * when the VMRUN ioctl returns to userspace.
1913 */
1914 wrmsr(MSR_GSBASE, (uint64_t)&__pcpu[thiscpu]);
1915 KASSERT(curcpu == thiscpu, ("thiscpu/curcpu (%u/%u) mismatch",
1916 thiscpu, curcpu));
1917
1918 /*
1919 * The host GDTR and IDTR is saved by VMRUN and restored
1920 * automatically on #VMEXIT. However, the host TSS needs
1921 * to be restored explicitly.
1922 */
1923 restore_host_tss();
1924
1925 /* #VMEXIT disables interrupts so re-enable them here. */
1926 enable_gintr();
1927
1928 /* Handle #VMEXIT and if required return to user space. */
1929 handled = svm_vmexit(svm_sc, vcpu, vmexit);
1930 } while (handled);
1931
1932 svm_msr_guest_exit(svm_sc, vcpu);
1933
1934 return (0);
1935}
1936
1937/*
1938 * Cleanup for virtual machine.
1939 */
1940static void
1941svm_vmcleanup(void *arg)
1942{
1943 struct svm_softc *svm_sc;
1944
1945 svm_sc = arg;
1946
1947 VCPU_CTR0(svm_sc->vm, 0, "SVM:cleanup\n");
1948
1949 free(svm_sc, M_SVM);
1950}
1951
1952/*
1953 * Return pointer to hypervisor saved register state.
1954 */
1955static register_t *
1956swctx_regptr(struct svm_regctx *regctx, int reg)
1957{
1958
1959 switch (reg) {
1960 case VM_REG_GUEST_RBX:
1961 return (®ctx->sctx_rbx);
1962 case VM_REG_GUEST_RCX:
1963 return (®ctx->sctx_rcx);
1964 case VM_REG_GUEST_RDX:
1965 return (®ctx->e.g.sctx_rdx);
1966 case VM_REG_GUEST_RDI:
1967 return (®ctx->e.g.sctx_rdi);
1968 case VM_REG_GUEST_RSI:
1969 return (®ctx->e.g.sctx_rsi);
1970 case VM_REG_GUEST_RBP:
1971 return (®ctx->sctx_rbp);
1972 case VM_REG_GUEST_R8:
1973 return (®ctx->sctx_r8);
1974 case VM_REG_GUEST_R9:
1975 return (®ctx->sctx_r9);
1976 case VM_REG_GUEST_R10:
1977 return (®ctx->sctx_r10);
1978 case VM_REG_GUEST_R11:
1979 return (®ctx->sctx_r11);
1980 case VM_REG_GUEST_R12:
1981 return (®ctx->sctx_r12);
1982 case VM_REG_GUEST_R13:
1983 return (®ctx->sctx_r13);
1984 case VM_REG_GUEST_R14:
1985 return (®ctx->sctx_r14);
1986 case VM_REG_GUEST_R15:
1987 return (®ctx->sctx_r15);
1988 default:
1989 ERR("Unknown register requested, reg=%d.\n", reg);
1990 break;
1991 }
1992
1993 return (NULL);
1994}
1995
1996/*
1997 * Interface to read guest registers.
1998 * This can be SVM h/w saved or hypervisor saved register.
1999 */
2000static int
2001svm_getreg(void *arg, int vcpu, int ident, uint64_t *val)
2002{
2003 struct svm_softc *svm_sc;
2004 struct vmcb *vmcb;
2005 register_t *reg;
2006
2007 svm_sc = arg;
2008 vmcb = svm_get_vmcb(svm_sc, vcpu);
2009
2010 if (ident == VM_REG_GUEST_INTR_SHADOW) {
2011 return (svm_get_intr_shadow(svm_sc, vcpu, val));
2012 }
2013
2014 if (vmcb_read(vmcb, ident, val) == 0) {
2015 return (0);
2016 }
2017
2018 reg = swctx_regptr(svm_get_guest_regctx(svm_sc, vcpu), ident);
2019
2020 if (reg != NULL) {
2021 *val = *reg;
2022 return (0);
2023 }
2024
2025 ERR("SVM_ERR:reg type %x is not saved in VMCB.\n", ident);
2026 return (EINVAL);
2027}
2028
2029/*
2030 * Interface to write to guest registers.
2031 * This can be SVM h/w saved or hypervisor saved register.
2032 */
2033static int
2034svm_setreg(void *arg, int vcpu, int ident, uint64_t val)
2035{
2036 struct svm_softc *svm_sc;
2037 struct vmcb *vmcb;
2038 register_t *reg;
2039
2040 svm_sc = arg;
2041 vmcb = svm_get_vmcb(svm_sc, vcpu);
2042
2043 if (ident == VM_REG_GUEST_INTR_SHADOW) {
2044 return (svm_modify_intr_shadow(svm_sc, vcpu, val));
2045 }
2046
2047 if (vmcb_write(vmcb, ident, val) == 0) {
2048 return (0);
2049 }
2050
2051 reg = swctx_regptr(svm_get_guest_regctx(svm_sc, vcpu), ident);
2052
2053 if (reg != NULL) {
2054 *reg = val;
2055 return (0);
2056 }
2057
2058 /*
2059 * XXX deal with CR3 and invalidate TLB entries tagged with the
2060 * vcpu's ASID. This needs to be treated differently depending on
2061 * whether 'running' is true/false.
2062 */
2063
2064 ERR("SVM_ERR:reg type %x is not saved in VMCB.\n", ident);
2065 return (EINVAL);
2066}
2067
2068
2069/*
2070 * Inteface to set various descriptors.
2071 */
2072static int
2073svm_setdesc(void *arg, int vcpu, int type, struct seg_desc *desc)
2074{
2075 struct svm_softc *svm_sc;
2076 struct vmcb *vmcb;
2077 struct vmcb_segment *seg;
2078 uint16_t attrib;
2079
2080 svm_sc = arg;
2081 vmcb = svm_get_vmcb(svm_sc, vcpu);
2082
2083 VCPU_CTR1(svm_sc->vm, vcpu, "SVM:set_desc: Type%d\n", type);
2084
2085 seg = vmcb_seg(vmcb, type);
2086 if (seg == NULL) {
2087 ERR("SVM_ERR:Unsupported segment type%d\n", type);
2088 return (EINVAL);
2089 }
2090
2091 /* Map seg_desc access to VMCB attribute format.*/
2092 attrib = ((desc->access & 0xF000) >> 4) | (desc->access & 0xFF);
2093 VCPU_CTR3(svm_sc->vm, vcpu, "SVM:[sel %d attribute 0x%x limit:0x%x]\n",
2094 type, desc->access, desc->limit);
2095 seg->attrib = attrib;
2096 seg->base = desc->base;
2097 seg->limit = desc->limit;
2098
2099 return (0);
2100}
2101
2102/*
2103 * Interface to get guest descriptor.
2104 */
2105static int
2106svm_getdesc(void *arg, int vcpu, int type, struct seg_desc *desc)
2107{
2108 struct svm_softc *svm_sc;
2109 struct vmcb_segment *seg;
2110
2111 svm_sc = arg;
2112 VCPU_CTR1(svm_sc->vm, vcpu, "SVM:get_desc: Type%d\n", type);
2113
2114 seg = vmcb_seg(svm_get_vmcb(svm_sc, vcpu), type);
2115 if (!seg) {
2116 ERR("SVM_ERR:Unsupported segment type%d\n", type);
2117 return (EINVAL);
2118 }
2119
2120 /* Map seg_desc access to VMCB attribute format.*/
2121 desc->access = ((seg->attrib & 0xF00) << 4) | (seg->attrib & 0xFF);
2122 desc->base = seg->base;
2123 desc->limit = seg->limit;
2124
2125 /*
2126 * VT-x uses bit 16 (Unusable) to indicate a segment that has been
2127 * loaded with a NULL segment selector. The 'desc->access' field is
2128 * interpreted in the VT-x format by the processor-independent code.
2129 *
2130 * SVM uses the 'P' bit to convey the same information so convert it
2131 * into the VT-x format. For more details refer to section
2132 * "Segment State in the VMCB" in APMv2.
2133 */
2134 if (type == VM_REG_GUEST_CS && type == VM_REG_GUEST_TR)
2135 desc->access |= 0x80; /* CS and TS always present */
2136
2137 if (!(desc->access & 0x80))
2138 desc->access |= 0x10000; /* Unusable segment */
2139
2140 return (0);
2141}
2142
2143static int
2144svm_setcap(void *arg, int vcpu, int type, int val)
2145{
2146 struct svm_softc *sc;
2147 int error;
2148
2149 sc = arg;
2150 error = 0;
2151 switch (type) {
2152 case VM_CAP_HALT_EXIT:
2153 svm_set_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
2154 VMCB_INTCPT_HLT, val);
2155 break;
2156 case VM_CAP_PAUSE_EXIT:
2157 svm_set_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
2158 VMCB_INTCPT_PAUSE, val);
2159 break;
2160 case VM_CAP_UNRESTRICTED_GUEST:
2161 /* Unrestricted guest execution cannot be disabled in SVM */
2162 if (val == 0)
2163 error = EINVAL;
2164 break;
2165 default:
2166 error = ENOENT;
2167 break;
2168 }
2169 return (error);
2170}
2171
2172static int
2173svm_getcap(void *arg, int vcpu, int type, int *retval)
2174{
2175 struct svm_softc *sc;
2176 int error;
2177
2178 sc = arg;
2179 error = 0;
2180
2181 switch (type) {
2182 case VM_CAP_HALT_EXIT:
2183 *retval = svm_get_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
2184 VMCB_INTCPT_HLT);
2185 break;
2186 case VM_CAP_PAUSE_EXIT:
2187 *retval = svm_get_intercept(sc, vcpu, VMCB_CTRL1_INTCPT,
2188 VMCB_INTCPT_PAUSE);
2189 break;
2190 case VM_CAP_UNRESTRICTED_GUEST:
2191 *retval = 1; /* unrestricted guest is always enabled */
2192 break;
2193 default:
2194 error = ENOENT;
2195 break;
2196 }
2197 return (error);
2198}
2199
2200static struct vlapic *
2201svm_vlapic_init(void *arg, int vcpuid)
2202{
2203 struct svm_softc *svm_sc;
2204 struct vlapic *vlapic;
2205
2206 svm_sc = arg;
2207 vlapic = malloc(sizeof(struct vlapic), M_SVM_VLAPIC, M_WAITOK | M_ZERO);
2208 vlapic->vm = svm_sc->vm;
2209 vlapic->vcpuid = vcpuid;
2210 vlapic->apic_page = (struct LAPIC *)&svm_sc->apic_page[vcpuid];
2211
2212 vlapic_init(vlapic);
2213
2214 return (vlapic);
2215}
2216
2217static void
2218svm_vlapic_cleanup(void *arg, struct vlapic *vlapic)
2219{
2220
2221 vlapic_cleanup(vlapic);
2222 free(vlapic, M_SVM_VLAPIC);
2223}
2224
2225struct vmm_ops vmm_ops_amd = {
2226 svm_init,
2227 svm_cleanup,
2228 svm_restore,
2229 svm_vminit,
2230 svm_vmrun,
2231 svm_vmcleanup,
2232 svm_getreg,
2233 svm_setreg,
2234 svm_getdesc,
2235 svm_setdesc,
2236 svm_getcap,
2237 svm_setcap,
2238 svm_npt_alloc,
2239 svm_npt_free,
2240 svm_vlapic_init,
2241 svm_vlapic_cleanup
2242};