xref: /openbmc/linux/arch/x86/kvm/svm/nested.c (revision 5e8bf00e)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Kernel-based Virtual Machine driver for Linux
4  *
5  * AMD SVM support
6  *
7  * Copyright (C) 2006 Qumranet, Inc.
8  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
9  *
10  * Authors:
11  *   Yaniv Kamay  <yaniv@qumranet.com>
12  *   Avi Kivity   <avi@qumranet.com>
13  */
14 
15 #define pr_fmt(fmt) "SVM: " fmt
16 
17 #include <linux/kvm_types.h>
18 #include <linux/kvm_host.h>
19 #include <linux/kernel.h>
20 
21 #include <asm/msr-index.h>
22 #include <asm/debugreg.h>
23 
24 #include "kvm_emulate.h"
25 #include "trace.h"
26 #include "mmu.h"
27 #include "x86.h"
28 #include "cpuid.h"
29 #include "lapic.h"
30 #include "svm.h"
31 #include "hyperv.h"
32 
33 #define CC KVM_NESTED_VMENTER_CONSISTENCY_CHECK
34 
35 static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
36 				       struct x86_exception *fault)
37 {
38 	struct vcpu_svm *svm = to_svm(vcpu);
39 	struct vmcb *vmcb = svm->vmcb;
40 
41 	if (vmcb->control.exit_code != SVM_EXIT_NPF) {
42 		/*
43 		 * TODO: track the cause of the nested page fault, and
44 		 * correctly fill in the high bits of exit_info_1.
45 		 */
46 		vmcb->control.exit_code = SVM_EXIT_NPF;
47 		vmcb->control.exit_code_hi = 0;
48 		vmcb->control.exit_info_1 = (1ULL << 32);
49 		vmcb->control.exit_info_2 = fault->address;
50 	}
51 
52 	vmcb->control.exit_info_1 &= ~0xffffffffULL;
53 	vmcb->control.exit_info_1 |= fault->error_code;
54 
55 	nested_svm_vmexit(svm);
56 }
57 
58 static bool nested_svm_handle_page_fault_workaround(struct kvm_vcpu *vcpu,
59 						    struct x86_exception *fault)
60 {
61 	struct vcpu_svm *svm = to_svm(vcpu);
62 	struct vmcb *vmcb = svm->vmcb;
63 
64  	WARN_ON(!is_guest_mode(vcpu));
65 
66 	if (vmcb12_is_intercept(&svm->nested.ctl,
67 				INTERCEPT_EXCEPTION_OFFSET + PF_VECTOR) &&
68 	    !WARN_ON_ONCE(svm->nested.nested_run_pending)) {
69 	     	vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + PF_VECTOR;
70 		vmcb->control.exit_code_hi = 0;
71 		vmcb->control.exit_info_1 = fault->error_code;
72 		vmcb->control.exit_info_2 = fault->address;
73 		nested_svm_vmexit(svm);
74 		return true;
75 	}
76 
77 	return false;
78 }
79 
80 static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
81 {
82 	struct vcpu_svm *svm = to_svm(vcpu);
83 	u64 cr3 = svm->nested.ctl.nested_cr3;
84 	u64 pdpte;
85 	int ret;
86 
87 	ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(cr3), &pdpte,
88 				       offset_in_page(cr3) + index * 8, 8);
89 	if (ret)
90 		return 0;
91 	return pdpte;
92 }
93 
94 static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
95 {
96 	struct vcpu_svm *svm = to_svm(vcpu);
97 
98 	return svm->nested.ctl.nested_cr3;
99 }
100 
101 static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
102 {
103 	struct vcpu_svm *svm = to_svm(vcpu);
104 
105 	WARN_ON(mmu_is_nested(vcpu));
106 
107 	vcpu->arch.mmu = &vcpu->arch.guest_mmu;
108 
109 	/*
110 	 * The NPT format depends on L1's CR4 and EFER, which is in vmcb01.  Note,
111 	 * when called via KVM_SET_NESTED_STATE, that state may _not_ match current
112 	 * vCPU state.  CR0.WP is explicitly ignored, while CR0.PG is required.
113 	 */
114 	kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, svm->vmcb01.ptr->save.cr4,
115 				svm->vmcb01.ptr->save.efer,
116 				svm->nested.ctl.nested_cr3);
117 	vcpu->arch.mmu->get_guest_pgd     = nested_svm_get_tdp_cr3;
118 	vcpu->arch.mmu->get_pdptr         = nested_svm_get_tdp_pdptr;
119 	vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit;
120 	vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
121 }
122 
123 static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
124 {
125 	vcpu->arch.mmu = &vcpu->arch.root_mmu;
126 	vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
127 }
128 
129 static bool nested_vmcb_needs_vls_intercept(struct vcpu_svm *svm)
130 {
131 	if (!svm->v_vmload_vmsave_enabled)
132 		return true;
133 
134 	if (!nested_npt_enabled(svm))
135 		return true;
136 
137 	if (!(svm->nested.ctl.virt_ext & VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK))
138 		return true;
139 
140 	return false;
141 }
142 
143 void recalc_intercepts(struct vcpu_svm *svm)
144 {
145 	struct vmcb_control_area *c, *h;
146 	struct vmcb_ctrl_area_cached *g;
147 	unsigned int i;
148 
149 	vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
150 
151 	if (!is_guest_mode(&svm->vcpu))
152 		return;
153 
154 	c = &svm->vmcb->control;
155 	h = &svm->vmcb01.ptr->control;
156 	g = &svm->nested.ctl;
157 
158 	for (i = 0; i < MAX_INTERCEPT; i++)
159 		c->intercepts[i] = h->intercepts[i];
160 
161 	if (g->int_ctl & V_INTR_MASKING_MASK) {
162 		/* We only want the cr8 intercept bits of L1 */
163 		vmcb_clr_intercept(c, INTERCEPT_CR8_READ);
164 		vmcb_clr_intercept(c, INTERCEPT_CR8_WRITE);
165 
166 		/*
167 		 * Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not
168 		 * affect any interrupt we may want to inject; therefore,
169 		 * interrupt window vmexits are irrelevant to L0.
170 		 */
171 		vmcb_clr_intercept(c, INTERCEPT_VINTR);
172 	}
173 
174 	/* We don't want to see VMMCALLs from a nested guest */
175 	vmcb_clr_intercept(c, INTERCEPT_VMMCALL);
176 
177 	for (i = 0; i < MAX_INTERCEPT; i++)
178 		c->intercepts[i] |= g->intercepts[i];
179 
180 	/* If SMI is not intercepted, ignore guest SMI intercept as well  */
181 	if (!intercept_smi)
182 		vmcb_clr_intercept(c, INTERCEPT_SMI);
183 
184 	if (nested_vmcb_needs_vls_intercept(svm)) {
185 		/*
186 		 * If the virtual VMLOAD/VMSAVE is not enabled for the L2,
187 		 * we must intercept these instructions to correctly
188 		 * emulate them in case L1 doesn't intercept them.
189 		 */
190 		vmcb_set_intercept(c, INTERCEPT_VMLOAD);
191 		vmcb_set_intercept(c, INTERCEPT_VMSAVE);
192 	} else {
193 		WARN_ON(!(c->virt_ext & VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK));
194 	}
195 }
196 
197 /*
198  * Merge L0's (KVM) and L1's (Nested VMCB) MSR permission bitmaps. The function
199  * is optimized in that it only merges the parts where KVM MSR permission bitmap
200  * may contain zero bits.
201  */
202 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
203 {
204 	struct hv_enlightenments *hve =
205 		(struct hv_enlightenments *)svm->nested.ctl.reserved_sw;
206 	int i;
207 
208 	/*
209 	 * MSR bitmap update can be skipped when:
210 	 * - MSR bitmap for L1 hasn't changed.
211 	 * - Nested hypervisor (L1) is attempting to launch the same L2 as
212 	 *   before.
213 	 * - Nested hypervisor (L1) is using Hyper-V emulation interface and
214 	 * tells KVM (L0) there were no changes in MSR bitmap for L2.
215 	 */
216 	if (!svm->nested.force_msr_bitmap_recalc &&
217 	    kvm_hv_hypercall_enabled(&svm->vcpu) &&
218 	    hve->hv_enlightenments_control.msr_bitmap &&
219 	    (svm->nested.ctl.clean & BIT(VMCB_HV_NESTED_ENLIGHTENMENTS)))
220 		goto set_msrpm_base_pa;
221 
222 	if (!(vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
223 		return true;
224 
225 	for (i = 0; i < MSRPM_OFFSETS; i++) {
226 		u32 value, p;
227 		u64 offset;
228 
229 		if (msrpm_offsets[i] == 0xffffffff)
230 			break;
231 
232 		p      = msrpm_offsets[i];
233 		offset = svm->nested.ctl.msrpm_base_pa + (p * 4);
234 
235 		if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
236 			return false;
237 
238 		svm->nested.msrpm[p] = svm->msrpm[p] | value;
239 	}
240 
241 	svm->nested.force_msr_bitmap_recalc = false;
242 
243 set_msrpm_base_pa:
244 	svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm));
245 
246 	return true;
247 }
248 
249 /*
250  * Bits 11:0 of bitmap address are ignored by hardware
251  */
252 static bool nested_svm_check_bitmap_pa(struct kvm_vcpu *vcpu, u64 pa, u32 size)
253 {
254 	u64 addr = PAGE_ALIGN(pa);
255 
256 	return kvm_vcpu_is_legal_gpa(vcpu, addr) &&
257 	    kvm_vcpu_is_legal_gpa(vcpu, addr + size - 1);
258 }
259 
260 static bool nested_svm_check_tlb_ctl(struct kvm_vcpu *vcpu, u8 tlb_ctl)
261 {
262 	/* Nested FLUSHBYASID is not supported yet.  */
263 	switch(tlb_ctl) {
264 		case TLB_CONTROL_DO_NOTHING:
265 		case TLB_CONTROL_FLUSH_ALL_ASID:
266 			return true;
267 		default:
268 			return false;
269 	}
270 }
271 
272 static bool __nested_vmcb_check_controls(struct kvm_vcpu *vcpu,
273 					 struct vmcb_ctrl_area_cached *control)
274 {
275 	if (CC(!vmcb12_is_intercept(control, INTERCEPT_VMRUN)))
276 		return false;
277 
278 	if (CC(control->asid == 0))
279 		return false;
280 
281 	if (CC((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && !npt_enabled))
282 		return false;
283 
284 	if (CC(!nested_svm_check_bitmap_pa(vcpu, control->msrpm_base_pa,
285 					   MSRPM_SIZE)))
286 		return false;
287 	if (CC(!nested_svm_check_bitmap_pa(vcpu, control->iopm_base_pa,
288 					   IOPM_SIZE)))
289 		return false;
290 
291 	if (CC(!nested_svm_check_tlb_ctl(vcpu, control->tlb_ctl)))
292 		return false;
293 
294 	return true;
295 }
296 
297 /* Common checks that apply to both L1 and L2 state.  */
298 static bool __nested_vmcb_check_save(struct kvm_vcpu *vcpu,
299 				     struct vmcb_save_area_cached *save)
300 {
301 	if (CC(!(save->efer & EFER_SVME)))
302 		return false;
303 
304 	if (CC((save->cr0 & X86_CR0_CD) == 0 && (save->cr0 & X86_CR0_NW)) ||
305 	    CC(save->cr0 & ~0xffffffffULL))
306 		return false;
307 
308 	if (CC(!kvm_dr6_valid(save->dr6)) || CC(!kvm_dr7_valid(save->dr7)))
309 		return false;
310 
311 	/*
312 	 * These checks are also performed by KVM_SET_SREGS,
313 	 * except that EFER.LMA is not checked by SVM against
314 	 * CR0.PG && EFER.LME.
315 	 */
316 	if ((save->efer & EFER_LME) && (save->cr0 & X86_CR0_PG)) {
317 		if (CC(!(save->cr4 & X86_CR4_PAE)) ||
318 		    CC(!(save->cr0 & X86_CR0_PE)) ||
319 		    CC(kvm_vcpu_is_illegal_gpa(vcpu, save->cr3)))
320 			return false;
321 	}
322 
323 	if (CC(!kvm_is_valid_cr4(vcpu, save->cr4)))
324 		return false;
325 
326 	if (CC(!kvm_valid_efer(vcpu, save->efer)))
327 		return false;
328 
329 	return true;
330 }
331 
332 static bool nested_vmcb_check_save(struct kvm_vcpu *vcpu)
333 {
334 	struct vcpu_svm *svm = to_svm(vcpu);
335 	struct vmcb_save_area_cached *save = &svm->nested.save;
336 
337 	return __nested_vmcb_check_save(vcpu, save);
338 }
339 
340 static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu)
341 {
342 	struct vcpu_svm *svm = to_svm(vcpu);
343 	struct vmcb_ctrl_area_cached *ctl = &svm->nested.ctl;
344 
345 	return __nested_vmcb_check_controls(vcpu, ctl);
346 }
347 
348 static
349 void __nested_copy_vmcb_control_to_cache(struct kvm_vcpu *vcpu,
350 					 struct vmcb_ctrl_area_cached *to,
351 					 struct vmcb_control_area *from)
352 {
353 	unsigned int i;
354 
355 	for (i = 0; i < MAX_INTERCEPT; i++)
356 		to->intercepts[i] = from->intercepts[i];
357 
358 	to->iopm_base_pa        = from->iopm_base_pa;
359 	to->msrpm_base_pa       = from->msrpm_base_pa;
360 	to->tsc_offset          = from->tsc_offset;
361 	to->tlb_ctl             = from->tlb_ctl;
362 	to->int_ctl             = from->int_ctl;
363 	to->int_vector          = from->int_vector;
364 	to->int_state           = from->int_state;
365 	to->exit_code           = from->exit_code;
366 	to->exit_code_hi        = from->exit_code_hi;
367 	to->exit_info_1         = from->exit_info_1;
368 	to->exit_info_2         = from->exit_info_2;
369 	to->exit_int_info       = from->exit_int_info;
370 	to->exit_int_info_err   = from->exit_int_info_err;
371 	to->nested_ctl          = from->nested_ctl;
372 	to->event_inj           = from->event_inj;
373 	to->event_inj_err       = from->event_inj_err;
374 	to->nested_cr3          = from->nested_cr3;
375 	to->virt_ext            = from->virt_ext;
376 	to->pause_filter_count  = from->pause_filter_count;
377 	to->pause_filter_thresh = from->pause_filter_thresh;
378 
379 	/* Copy asid here because nested_vmcb_check_controls will check it.  */
380 	to->asid           = from->asid;
381 	to->msrpm_base_pa &= ~0x0fffULL;
382 	to->iopm_base_pa  &= ~0x0fffULL;
383 
384 	/* Hyper-V extensions (Enlightened VMCB) */
385 	if (kvm_hv_hypercall_enabled(vcpu)) {
386 		to->clean = from->clean;
387 		memcpy(to->reserved_sw, from->reserved_sw,
388 		       sizeof(struct hv_enlightenments));
389 	}
390 }
391 
392 void nested_copy_vmcb_control_to_cache(struct vcpu_svm *svm,
393 				       struct vmcb_control_area *control)
394 {
395 	__nested_copy_vmcb_control_to_cache(&svm->vcpu, &svm->nested.ctl, control);
396 }
397 
398 static void __nested_copy_vmcb_save_to_cache(struct vmcb_save_area_cached *to,
399 					     struct vmcb_save_area *from)
400 {
401 	/*
402 	 * Copy only fields that are validated, as we need them
403 	 * to avoid TOC/TOU races.
404 	 */
405 	to->efer = from->efer;
406 	to->cr0 = from->cr0;
407 	to->cr3 = from->cr3;
408 	to->cr4 = from->cr4;
409 
410 	to->dr6 = from->dr6;
411 	to->dr7 = from->dr7;
412 }
413 
414 void nested_copy_vmcb_save_to_cache(struct vcpu_svm *svm,
415 				    struct vmcb_save_area *save)
416 {
417 	__nested_copy_vmcb_save_to_cache(&svm->nested.save, save);
418 }
419 
420 /*
421  * Synchronize fields that are written by the processor, so that
422  * they can be copied back into the vmcb12.
423  */
424 void nested_sync_control_from_vmcb02(struct vcpu_svm *svm)
425 {
426 	u32 mask;
427 	svm->nested.ctl.event_inj      = svm->vmcb->control.event_inj;
428 	svm->nested.ctl.event_inj_err  = svm->vmcb->control.event_inj_err;
429 
430 	/* Only a few fields of int_ctl are written by the processor.  */
431 	mask = V_IRQ_MASK | V_TPR_MASK;
432 	if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) &&
433 	    svm_is_intercept(svm, INTERCEPT_VINTR)) {
434 		/*
435 		 * In order to request an interrupt window, L0 is usurping
436 		 * svm->vmcb->control.int_ctl and possibly setting V_IRQ
437 		 * even if it was clear in L1's VMCB.  Restoring it would be
438 		 * wrong.  However, in this case V_IRQ will remain true until
439 		 * interrupt_window_interception calls svm_clear_vintr and
440 		 * restores int_ctl.  We can just leave it aside.
441 		 */
442 		mask &= ~V_IRQ_MASK;
443 	}
444 
445 	if (nested_vgif_enabled(svm))
446 		mask |= V_GIF_MASK;
447 
448 	svm->nested.ctl.int_ctl        &= ~mask;
449 	svm->nested.ctl.int_ctl        |= svm->vmcb->control.int_ctl & mask;
450 }
451 
452 /*
453  * Transfer any event that L0 or L1 wanted to inject into L2 to
454  * EXIT_INT_INFO.
455  */
456 static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm,
457 						struct vmcb *vmcb12)
458 {
459 	struct kvm_vcpu *vcpu = &svm->vcpu;
460 	u32 exit_int_info = 0;
461 	unsigned int nr;
462 
463 	if (vcpu->arch.exception.injected) {
464 		nr = vcpu->arch.exception.nr;
465 		exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT;
466 
467 		if (vcpu->arch.exception.has_error_code) {
468 			exit_int_info |= SVM_EVTINJ_VALID_ERR;
469 			vmcb12->control.exit_int_info_err =
470 				vcpu->arch.exception.error_code;
471 		}
472 
473 	} else if (vcpu->arch.nmi_injected) {
474 		exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
475 
476 	} else if (vcpu->arch.interrupt.injected) {
477 		nr = vcpu->arch.interrupt.nr;
478 		exit_int_info = nr | SVM_EVTINJ_VALID;
479 
480 		if (vcpu->arch.interrupt.soft)
481 			exit_int_info |= SVM_EVTINJ_TYPE_SOFT;
482 		else
483 			exit_int_info |= SVM_EVTINJ_TYPE_INTR;
484 	}
485 
486 	vmcb12->control.exit_int_info = exit_int_info;
487 }
488 
489 static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu)
490 {
491 	/*
492 	 * TODO: optimize unconditional TLB flush/MMU sync.  A partial list of
493 	 * things to fix before this can be conditional:
494 	 *
495 	 *  - Flush TLBs for both L1 and L2 remote TLB flush
496 	 *  - Honor L1's request to flush an ASID on nested VMRUN
497 	 *  - Sync nested NPT MMU on VMRUN that flushes L2's ASID[*]
498 	 *  - Don't crush a pending TLB flush in vmcb02 on nested VMRUN
499 	 *  - Flush L1's ASID on KVM_REQ_TLB_FLUSH_GUEST
500 	 *
501 	 * [*] Unlike nested EPT, SVM's ASID management can invalidate nested
502 	 *     NPT guest-physical mappings on VMRUN.
503 	 */
504 	kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
505 	kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
506 }
507 
508 /*
509  * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true
510  * if we are emulating VM-Entry into a guest with NPT enabled.
511  */
512 static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
513 			       bool nested_npt, bool reload_pdptrs)
514 {
515 	if (CC(kvm_vcpu_is_illegal_gpa(vcpu, cr3)))
516 		return -EINVAL;
517 
518 	if (reload_pdptrs && !nested_npt && is_pae_paging(vcpu) &&
519 	    CC(!load_pdptrs(vcpu, cr3)))
520 		return -EINVAL;
521 
522 	vcpu->arch.cr3 = cr3;
523 
524 	/* Re-initialize the MMU, e.g. to pick up CR4 MMU role changes. */
525 	kvm_init_mmu(vcpu);
526 
527 	if (!nested_npt)
528 		kvm_mmu_new_pgd(vcpu, cr3);
529 
530 	return 0;
531 }
532 
533 void nested_vmcb02_compute_g_pat(struct vcpu_svm *svm)
534 {
535 	if (!svm->nested.vmcb02.ptr)
536 		return;
537 
538 	/* FIXME: merge g_pat from vmcb01 and vmcb12.  */
539 	svm->nested.vmcb02.ptr->save.g_pat = svm->vmcb01.ptr->save.g_pat;
540 }
541 
542 static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12)
543 {
544 	bool new_vmcb12 = false;
545 	struct vmcb *vmcb01 = svm->vmcb01.ptr;
546 	struct vmcb *vmcb02 = svm->nested.vmcb02.ptr;
547 
548 	nested_vmcb02_compute_g_pat(svm);
549 
550 	/* Load the nested guest state */
551 	if (svm->nested.vmcb12_gpa != svm->nested.last_vmcb12_gpa) {
552 		new_vmcb12 = true;
553 		svm->nested.last_vmcb12_gpa = svm->nested.vmcb12_gpa;
554 		svm->nested.force_msr_bitmap_recalc = true;
555 	}
556 
557 	if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_SEG))) {
558 		vmcb02->save.es = vmcb12->save.es;
559 		vmcb02->save.cs = vmcb12->save.cs;
560 		vmcb02->save.ss = vmcb12->save.ss;
561 		vmcb02->save.ds = vmcb12->save.ds;
562 		vmcb02->save.cpl = vmcb12->save.cpl;
563 		vmcb_mark_dirty(vmcb02, VMCB_SEG);
564 	}
565 
566 	if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DT))) {
567 		vmcb02->save.gdtr = vmcb12->save.gdtr;
568 		vmcb02->save.idtr = vmcb12->save.idtr;
569 		vmcb_mark_dirty(vmcb02, VMCB_DT);
570 	}
571 
572 	kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED);
573 
574 	svm_set_efer(&svm->vcpu, svm->nested.save.efer);
575 
576 	svm_set_cr0(&svm->vcpu, svm->nested.save.cr0);
577 	svm_set_cr4(&svm->vcpu, svm->nested.save.cr4);
578 
579 	svm->vcpu.arch.cr2 = vmcb12->save.cr2;
580 
581 	kvm_rax_write(&svm->vcpu, vmcb12->save.rax);
582 	kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp);
583 	kvm_rip_write(&svm->vcpu, vmcb12->save.rip);
584 
585 	/* In case we don't even reach vcpu_run, the fields are not updated */
586 	vmcb02->save.rax = vmcb12->save.rax;
587 	vmcb02->save.rsp = vmcb12->save.rsp;
588 	vmcb02->save.rip = vmcb12->save.rip;
589 
590 	/* These bits will be set properly on the first execution when new_vmc12 is true */
591 	if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DR))) {
592 		vmcb02->save.dr7 = svm->nested.save.dr7 | DR7_FIXED_1;
593 		svm->vcpu.arch.dr6  = svm->nested.save.dr6 | DR6_ACTIVE_LOW;
594 		vmcb_mark_dirty(vmcb02, VMCB_DR);
595 	}
596 
597 	if (unlikely(svm->lbrv_enabled && (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
598 		/*
599 		 * Reserved bits of DEBUGCTL are ignored.  Be consistent with
600 		 * svm_set_msr's definition of reserved bits.
601 		 */
602 		svm_copy_lbrs(vmcb02, vmcb12);
603 		vmcb02->save.dbgctl &= ~DEBUGCTL_RESERVED_BITS;
604 		svm_update_lbrv(&svm->vcpu);
605 
606 	} else if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) {
607 		svm_copy_lbrs(vmcb02, vmcb01);
608 	}
609 }
610 
611 static void nested_vmcb02_prepare_control(struct vcpu_svm *svm)
612 {
613 	u32 int_ctl_vmcb01_bits = V_INTR_MASKING_MASK;
614 	u32 int_ctl_vmcb12_bits = V_TPR_MASK | V_IRQ_INJECTION_BITS_MASK;
615 
616 	struct kvm_vcpu *vcpu = &svm->vcpu;
617 	struct vmcb *vmcb01 = svm->vmcb01.ptr;
618 	struct vmcb *vmcb02 = svm->nested.vmcb02.ptr;
619 	u32 pause_count12;
620 	u32 pause_thresh12;
621 
622 	/*
623 	 * Filled at exit: exit_code, exit_code_hi, exit_info_1, exit_info_2,
624 	 * exit_int_info, exit_int_info_err, next_rip, insn_len, insn_bytes.
625 	 */
626 
627 	if (svm->vgif_enabled && (svm->nested.ctl.int_ctl & V_GIF_ENABLE_MASK))
628 		int_ctl_vmcb12_bits |= (V_GIF_MASK | V_GIF_ENABLE_MASK);
629 	else
630 		int_ctl_vmcb01_bits |= (V_GIF_MASK | V_GIF_ENABLE_MASK);
631 
632 	/* Copied from vmcb01.  msrpm_base can be overwritten later.  */
633 	vmcb02->control.nested_ctl = vmcb01->control.nested_ctl;
634 	vmcb02->control.iopm_base_pa = vmcb01->control.iopm_base_pa;
635 	vmcb02->control.msrpm_base_pa = vmcb01->control.msrpm_base_pa;
636 
637 	/* Done at vmrun: asid.  */
638 
639 	/* Also overwritten later if necessary.  */
640 	vmcb02->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
641 
642 	/* nested_cr3.  */
643 	if (nested_npt_enabled(svm))
644 		nested_svm_init_mmu_context(vcpu);
645 
646 	vcpu->arch.tsc_offset = kvm_calc_nested_tsc_offset(
647 			vcpu->arch.l1_tsc_offset,
648 			svm->nested.ctl.tsc_offset,
649 			svm->tsc_ratio_msr);
650 
651 	vmcb02->control.tsc_offset = vcpu->arch.tsc_offset;
652 
653 	if (svm->tsc_ratio_msr != kvm_default_tsc_scaling_ratio) {
654 		WARN_ON(!svm->tsc_scaling_enabled);
655 		nested_svm_update_tsc_ratio_msr(vcpu);
656 	}
657 
658 	vmcb02->control.int_ctl             =
659 		(svm->nested.ctl.int_ctl & int_ctl_vmcb12_bits) |
660 		(vmcb01->control.int_ctl & int_ctl_vmcb01_bits);
661 
662 	vmcb02->control.int_vector          = svm->nested.ctl.int_vector;
663 	vmcb02->control.int_state           = svm->nested.ctl.int_state;
664 	vmcb02->control.event_inj           = svm->nested.ctl.event_inj;
665 	vmcb02->control.event_inj_err       = svm->nested.ctl.event_inj_err;
666 
667 	vmcb02->control.virt_ext            = vmcb01->control.virt_ext &
668 					      LBR_CTL_ENABLE_MASK;
669 	if (svm->lbrv_enabled)
670 		vmcb02->control.virt_ext  |=
671 			(svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK);
672 
673 	if (!nested_vmcb_needs_vls_intercept(svm))
674 		vmcb02->control.virt_ext |= VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK;
675 
676 	pause_count12 = svm->pause_filter_enabled ? svm->nested.ctl.pause_filter_count : 0;
677 	pause_thresh12 = svm->pause_threshold_enabled ? svm->nested.ctl.pause_filter_thresh : 0;
678 	if (kvm_pause_in_guest(svm->vcpu.kvm)) {
679 		/* use guest values since host doesn't intercept PAUSE */
680 		vmcb02->control.pause_filter_count = pause_count12;
681 		vmcb02->control.pause_filter_thresh = pause_thresh12;
682 
683 	} else {
684 		/* start from host values otherwise */
685 		vmcb02->control.pause_filter_count = vmcb01->control.pause_filter_count;
686 		vmcb02->control.pause_filter_thresh = vmcb01->control.pause_filter_thresh;
687 
688 		/* ... but ensure filtering is disabled if so requested.  */
689 		if (vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_PAUSE)) {
690 			if (!pause_count12)
691 				vmcb02->control.pause_filter_count = 0;
692 			if (!pause_thresh12)
693 				vmcb02->control.pause_filter_thresh = 0;
694 		}
695 	}
696 
697 	nested_svm_transition_tlb_flush(vcpu);
698 
699 	/* Enter Guest-Mode */
700 	enter_guest_mode(vcpu);
701 
702 	/*
703 	 * Merge guest and host intercepts - must be called with vcpu in
704 	 * guest-mode to take effect.
705 	 */
706 	recalc_intercepts(svm);
707 }
708 
709 static void nested_svm_copy_common_state(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
710 {
711 	/*
712 	 * Some VMCB state is shared between L1 and L2 and thus has to be
713 	 * moved at the time of nested vmrun and vmexit.
714 	 *
715 	 * VMLOAD/VMSAVE state would also belong in this category, but KVM
716 	 * always performs VMLOAD and VMSAVE from the VMCB01.
717 	 */
718 	to_vmcb->save.spec_ctrl = from_vmcb->save.spec_ctrl;
719 }
720 
721 int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa,
722 			 struct vmcb *vmcb12, bool from_vmrun)
723 {
724 	struct vcpu_svm *svm = to_svm(vcpu);
725 	int ret;
726 
727 	trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa,
728 			       vmcb12->save.rip,
729 			       vmcb12->control.int_ctl,
730 			       vmcb12->control.event_inj,
731 			       vmcb12->control.nested_ctl);
732 
733 	trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff,
734 				    vmcb12->control.intercepts[INTERCEPT_CR] >> 16,
735 				    vmcb12->control.intercepts[INTERCEPT_EXCEPTION],
736 				    vmcb12->control.intercepts[INTERCEPT_WORD3],
737 				    vmcb12->control.intercepts[INTERCEPT_WORD4],
738 				    vmcb12->control.intercepts[INTERCEPT_WORD5]);
739 
740 
741 	svm->nested.vmcb12_gpa = vmcb12_gpa;
742 
743 	WARN_ON(svm->vmcb == svm->nested.vmcb02.ptr);
744 
745 	nested_svm_copy_common_state(svm->vmcb01.ptr, svm->nested.vmcb02.ptr);
746 
747 	svm_switch_vmcb(svm, &svm->nested.vmcb02);
748 	nested_vmcb02_prepare_control(svm);
749 	nested_vmcb02_prepare_save(svm, vmcb12);
750 
751 	ret = nested_svm_load_cr3(&svm->vcpu, svm->nested.save.cr3,
752 				  nested_npt_enabled(svm), from_vmrun);
753 	if (ret)
754 		return ret;
755 
756 	if (!from_vmrun)
757 		kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
758 
759 	svm_set_gif(svm, true);
760 
761 	if (kvm_vcpu_apicv_active(vcpu))
762 		kvm_make_request(KVM_REQ_APICV_UPDATE, vcpu);
763 
764 	return 0;
765 }
766 
767 int nested_svm_vmrun(struct kvm_vcpu *vcpu)
768 {
769 	struct vcpu_svm *svm = to_svm(vcpu);
770 	int ret;
771 	struct vmcb *vmcb12;
772 	struct kvm_host_map map;
773 	u64 vmcb12_gpa;
774 	struct vmcb *vmcb01 = svm->vmcb01.ptr;
775 
776 	if (!svm->nested.hsave_msr) {
777 		kvm_inject_gp(vcpu, 0);
778 		return 1;
779 	}
780 
781 	if (is_smm(vcpu)) {
782 		kvm_queue_exception(vcpu, UD_VECTOR);
783 		return 1;
784 	}
785 
786 	vmcb12_gpa = svm->vmcb->save.rax;
787 	ret = kvm_vcpu_map(vcpu, gpa_to_gfn(vmcb12_gpa), &map);
788 	if (ret == -EINVAL) {
789 		kvm_inject_gp(vcpu, 0);
790 		return 1;
791 	} else if (ret) {
792 		return kvm_skip_emulated_instruction(vcpu);
793 	}
794 
795 	ret = kvm_skip_emulated_instruction(vcpu);
796 
797 	vmcb12 = map.hva;
798 
799 	if (WARN_ON_ONCE(!svm->nested.initialized))
800 		return -EINVAL;
801 
802 	nested_copy_vmcb_control_to_cache(svm, &vmcb12->control);
803 	nested_copy_vmcb_save_to_cache(svm, &vmcb12->save);
804 
805 	if (!nested_vmcb_check_save(vcpu) ||
806 	    !nested_vmcb_check_controls(vcpu)) {
807 		vmcb12->control.exit_code    = SVM_EXIT_ERR;
808 		vmcb12->control.exit_code_hi = 0;
809 		vmcb12->control.exit_info_1  = 0;
810 		vmcb12->control.exit_info_2  = 0;
811 		goto out;
812 	}
813 
814 	/*
815 	 * Since vmcb01 is not in use, we can use it to store some of the L1
816 	 * state.
817 	 */
818 	vmcb01->save.efer   = vcpu->arch.efer;
819 	vmcb01->save.cr0    = kvm_read_cr0(vcpu);
820 	vmcb01->save.cr4    = vcpu->arch.cr4;
821 	vmcb01->save.rflags = kvm_get_rflags(vcpu);
822 	vmcb01->save.rip    = kvm_rip_read(vcpu);
823 
824 	if (!npt_enabled)
825 		vmcb01->save.cr3 = kvm_read_cr3(vcpu);
826 
827 	svm->nested.nested_run_pending = 1;
828 
829 	if (enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12, true))
830 		goto out_exit_err;
831 
832 	if (nested_svm_vmrun_msrpm(svm))
833 		goto out;
834 
835 out_exit_err:
836 	svm->nested.nested_run_pending = 0;
837 
838 	svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
839 	svm->vmcb->control.exit_code_hi = 0;
840 	svm->vmcb->control.exit_info_1  = 0;
841 	svm->vmcb->control.exit_info_2  = 0;
842 
843 	nested_svm_vmexit(svm);
844 
845 out:
846 	kvm_vcpu_unmap(vcpu, &map, true);
847 
848 	return ret;
849 }
850 
851 /* Copy state save area fields which are handled by VMRUN */
852 void svm_copy_vmrun_state(struct vmcb_save_area *to_save,
853 			  struct vmcb_save_area *from_save)
854 {
855 	to_save->es = from_save->es;
856 	to_save->cs = from_save->cs;
857 	to_save->ss = from_save->ss;
858 	to_save->ds = from_save->ds;
859 	to_save->gdtr = from_save->gdtr;
860 	to_save->idtr = from_save->idtr;
861 	to_save->rflags = from_save->rflags | X86_EFLAGS_FIXED;
862 	to_save->efer = from_save->efer;
863 	to_save->cr0 = from_save->cr0;
864 	to_save->cr3 = from_save->cr3;
865 	to_save->cr4 = from_save->cr4;
866 	to_save->rax = from_save->rax;
867 	to_save->rsp = from_save->rsp;
868 	to_save->rip = from_save->rip;
869 	to_save->cpl = 0;
870 }
871 
872 void svm_copy_vmloadsave_state(struct vmcb *to_vmcb, struct vmcb *from_vmcb)
873 {
874 	to_vmcb->save.fs = from_vmcb->save.fs;
875 	to_vmcb->save.gs = from_vmcb->save.gs;
876 	to_vmcb->save.tr = from_vmcb->save.tr;
877 	to_vmcb->save.ldtr = from_vmcb->save.ldtr;
878 	to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
879 	to_vmcb->save.star = from_vmcb->save.star;
880 	to_vmcb->save.lstar = from_vmcb->save.lstar;
881 	to_vmcb->save.cstar = from_vmcb->save.cstar;
882 	to_vmcb->save.sfmask = from_vmcb->save.sfmask;
883 	to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
884 	to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
885 	to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
886 }
887 
888 int nested_svm_vmexit(struct vcpu_svm *svm)
889 {
890 	struct kvm_vcpu *vcpu = &svm->vcpu;
891 	struct vmcb *vmcb01 = svm->vmcb01.ptr;
892 	struct vmcb *vmcb02 = svm->nested.vmcb02.ptr;
893 	struct vmcb *vmcb12;
894 	struct kvm_host_map map;
895 	int rc;
896 
897 	rc = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map);
898 	if (rc) {
899 		if (rc == -EINVAL)
900 			kvm_inject_gp(vcpu, 0);
901 		return 1;
902 	}
903 
904 	vmcb12 = map.hva;
905 
906 	/* Exit Guest-Mode */
907 	leave_guest_mode(vcpu);
908 	svm->nested.vmcb12_gpa = 0;
909 	WARN_ON_ONCE(svm->nested.nested_run_pending);
910 
911 	kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
912 
913 	/* in case we halted in L2 */
914 	svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE;
915 
916 	/* Give the current vmcb to the guest */
917 
918 	vmcb12->save.es     = vmcb02->save.es;
919 	vmcb12->save.cs     = vmcb02->save.cs;
920 	vmcb12->save.ss     = vmcb02->save.ss;
921 	vmcb12->save.ds     = vmcb02->save.ds;
922 	vmcb12->save.gdtr   = vmcb02->save.gdtr;
923 	vmcb12->save.idtr   = vmcb02->save.idtr;
924 	vmcb12->save.efer   = svm->vcpu.arch.efer;
925 	vmcb12->save.cr0    = kvm_read_cr0(vcpu);
926 	vmcb12->save.cr3    = kvm_read_cr3(vcpu);
927 	vmcb12->save.cr2    = vmcb02->save.cr2;
928 	vmcb12->save.cr4    = svm->vcpu.arch.cr4;
929 	vmcb12->save.rflags = kvm_get_rflags(vcpu);
930 	vmcb12->save.rip    = kvm_rip_read(vcpu);
931 	vmcb12->save.rsp    = kvm_rsp_read(vcpu);
932 	vmcb12->save.rax    = kvm_rax_read(vcpu);
933 	vmcb12->save.dr7    = vmcb02->save.dr7;
934 	vmcb12->save.dr6    = svm->vcpu.arch.dr6;
935 	vmcb12->save.cpl    = vmcb02->save.cpl;
936 
937 	vmcb12->control.int_state         = vmcb02->control.int_state;
938 	vmcb12->control.exit_code         = vmcb02->control.exit_code;
939 	vmcb12->control.exit_code_hi      = vmcb02->control.exit_code_hi;
940 	vmcb12->control.exit_info_1       = vmcb02->control.exit_info_1;
941 	vmcb12->control.exit_info_2       = vmcb02->control.exit_info_2;
942 
943 	if (vmcb12->control.exit_code != SVM_EXIT_ERR)
944 		nested_save_pending_event_to_vmcb12(svm, vmcb12);
945 
946 	if (svm->nrips_enabled)
947 		vmcb12->control.next_rip  = vmcb02->control.next_rip;
948 
949 	vmcb12->control.int_ctl           = svm->nested.ctl.int_ctl;
950 	vmcb12->control.tlb_ctl           = svm->nested.ctl.tlb_ctl;
951 	vmcb12->control.event_inj         = svm->nested.ctl.event_inj;
952 	vmcb12->control.event_inj_err     = svm->nested.ctl.event_inj_err;
953 
954 	if (!kvm_pause_in_guest(vcpu->kvm)) {
955 		vmcb01->control.pause_filter_count = vmcb02->control.pause_filter_count;
956 		vmcb_mark_dirty(vmcb01, VMCB_INTERCEPTS);
957 
958 	}
959 
960 	nested_svm_copy_common_state(svm->nested.vmcb02.ptr, svm->vmcb01.ptr);
961 
962 	svm_switch_vmcb(svm, &svm->vmcb01);
963 
964 	if (unlikely(svm->lbrv_enabled && (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
965 		svm_copy_lbrs(vmcb12, vmcb02);
966 		svm_update_lbrv(vcpu);
967 	} else if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) {
968 		svm_copy_lbrs(vmcb01, vmcb02);
969 		svm_update_lbrv(vcpu);
970 	}
971 
972 	/*
973 	 * On vmexit the  GIF is set to false and
974 	 * no event can be injected in L1.
975 	 */
976 	svm_set_gif(svm, false);
977 	vmcb01->control.exit_int_info = 0;
978 
979 	svm->vcpu.arch.tsc_offset = svm->vcpu.arch.l1_tsc_offset;
980 	if (vmcb01->control.tsc_offset != svm->vcpu.arch.tsc_offset) {
981 		vmcb01->control.tsc_offset = svm->vcpu.arch.tsc_offset;
982 		vmcb_mark_dirty(vmcb01, VMCB_INTERCEPTS);
983 	}
984 
985 	if (svm->tsc_ratio_msr != kvm_default_tsc_scaling_ratio) {
986 		WARN_ON(!svm->tsc_scaling_enabled);
987 		vcpu->arch.tsc_scaling_ratio = vcpu->arch.l1_tsc_scaling_ratio;
988 		__svm_write_tsc_multiplier(vcpu->arch.tsc_scaling_ratio);
989 	}
990 
991 	svm->nested.ctl.nested_cr3 = 0;
992 
993 	/*
994 	 * Restore processor state that had been saved in vmcb01
995 	 */
996 	kvm_set_rflags(vcpu, vmcb01->save.rflags);
997 	svm_set_efer(vcpu, vmcb01->save.efer);
998 	svm_set_cr0(vcpu, vmcb01->save.cr0 | X86_CR0_PE);
999 	svm_set_cr4(vcpu, vmcb01->save.cr4);
1000 	kvm_rax_write(vcpu, vmcb01->save.rax);
1001 	kvm_rsp_write(vcpu, vmcb01->save.rsp);
1002 	kvm_rip_write(vcpu, vmcb01->save.rip);
1003 
1004 	svm->vcpu.arch.dr7 = DR7_FIXED_1;
1005 	kvm_update_dr7(&svm->vcpu);
1006 
1007 	trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code,
1008 				       vmcb12->control.exit_info_1,
1009 				       vmcb12->control.exit_info_2,
1010 				       vmcb12->control.exit_int_info,
1011 				       vmcb12->control.exit_int_info_err,
1012 				       KVM_ISA_SVM);
1013 
1014 	kvm_vcpu_unmap(vcpu, &map, true);
1015 
1016 	nested_svm_transition_tlb_flush(vcpu);
1017 
1018 	nested_svm_uninit_mmu_context(vcpu);
1019 
1020 	rc = nested_svm_load_cr3(vcpu, vmcb01->save.cr3, false, true);
1021 	if (rc)
1022 		return 1;
1023 
1024 	/*
1025 	 * Drop what we picked up for L2 via svm_complete_interrupts() so it
1026 	 * doesn't end up in L1.
1027 	 */
1028 	svm->vcpu.arch.nmi_injected = false;
1029 	kvm_clear_exception_queue(vcpu);
1030 	kvm_clear_interrupt_queue(vcpu);
1031 
1032 	/*
1033 	 * If we are here following the completion of a VMRUN that
1034 	 * is being single-stepped, queue the pending #DB intercept
1035 	 * right now so that it an be accounted for before we execute
1036 	 * L1's next instruction.
1037 	 */
1038 	if (unlikely(vmcb01->save.rflags & X86_EFLAGS_TF))
1039 		kvm_queue_exception(&(svm->vcpu), DB_VECTOR);
1040 
1041 	/*
1042 	 * Un-inhibit the AVIC right away, so that other vCPUs can start
1043 	 * to benefit from it right away.
1044 	 */
1045 	if (kvm_apicv_activated(vcpu->kvm))
1046 		kvm_vcpu_update_apicv(vcpu);
1047 
1048 	return 0;
1049 }
1050 
1051 static void nested_svm_triple_fault(struct kvm_vcpu *vcpu)
1052 {
1053 	nested_svm_simple_vmexit(to_svm(vcpu), SVM_EXIT_SHUTDOWN);
1054 }
1055 
1056 int svm_allocate_nested(struct vcpu_svm *svm)
1057 {
1058 	struct page *vmcb02_page;
1059 
1060 	if (svm->nested.initialized)
1061 		return 0;
1062 
1063 	vmcb02_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
1064 	if (!vmcb02_page)
1065 		return -ENOMEM;
1066 	svm->nested.vmcb02.ptr = page_address(vmcb02_page);
1067 	svm->nested.vmcb02.pa = __sme_set(page_to_pfn(vmcb02_page) << PAGE_SHIFT);
1068 
1069 	svm->nested.msrpm = svm_vcpu_alloc_msrpm();
1070 	if (!svm->nested.msrpm)
1071 		goto err_free_vmcb02;
1072 	svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm);
1073 
1074 	svm->nested.initialized = true;
1075 	return 0;
1076 
1077 err_free_vmcb02:
1078 	__free_page(vmcb02_page);
1079 	return -ENOMEM;
1080 }
1081 
1082 void svm_free_nested(struct vcpu_svm *svm)
1083 {
1084 	if (!svm->nested.initialized)
1085 		return;
1086 
1087 	svm_vcpu_free_msrpm(svm->nested.msrpm);
1088 	svm->nested.msrpm = NULL;
1089 
1090 	__free_page(virt_to_page(svm->nested.vmcb02.ptr));
1091 	svm->nested.vmcb02.ptr = NULL;
1092 
1093 	/*
1094 	 * When last_vmcb12_gpa matches the current vmcb12 gpa,
1095 	 * some vmcb12 fields are not loaded if they are marked clean
1096 	 * in the vmcb12, since in this case they are up to date already.
1097 	 *
1098 	 * When the vmcb02 is freed, this optimization becomes invalid.
1099 	 */
1100 	svm->nested.last_vmcb12_gpa = INVALID_GPA;
1101 
1102 	svm->nested.initialized = false;
1103 }
1104 
1105 /*
1106  * Forcibly leave nested mode in order to be able to reset the VCPU later on.
1107  */
1108 void svm_leave_nested(struct kvm_vcpu *vcpu)
1109 {
1110 	struct vcpu_svm *svm = to_svm(vcpu);
1111 
1112 	if (is_guest_mode(vcpu)) {
1113 		svm->nested.nested_run_pending = 0;
1114 		svm->nested.vmcb12_gpa = INVALID_GPA;
1115 
1116 		leave_guest_mode(vcpu);
1117 
1118 		svm_switch_vmcb(svm, &svm->vmcb01);
1119 
1120 		nested_svm_uninit_mmu_context(vcpu);
1121 		vmcb_mark_all_dirty(svm->vmcb);
1122 	}
1123 
1124 	kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
1125 }
1126 
1127 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
1128 {
1129 	u32 offset, msr, value;
1130 	int write, mask;
1131 
1132 	if (!(vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
1133 		return NESTED_EXIT_HOST;
1134 
1135 	msr    = svm->vcpu.arch.regs[VCPU_REGS_RCX];
1136 	offset = svm_msrpm_offset(msr);
1137 	write  = svm->vmcb->control.exit_info_1 & 1;
1138 	mask   = 1 << ((2 * (msr & 0xf)) + write);
1139 
1140 	if (offset == MSR_INVALID)
1141 		return NESTED_EXIT_DONE;
1142 
1143 	/* Offset is in 32 bit units but need in 8 bit units */
1144 	offset *= 4;
1145 
1146 	if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4))
1147 		return NESTED_EXIT_DONE;
1148 
1149 	return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
1150 }
1151 
1152 static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
1153 {
1154 	unsigned port, size, iopm_len;
1155 	u16 val, mask;
1156 	u8 start_bit;
1157 	u64 gpa;
1158 
1159 	if (!(vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT)))
1160 		return NESTED_EXIT_HOST;
1161 
1162 	port = svm->vmcb->control.exit_info_1 >> 16;
1163 	size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
1164 		SVM_IOIO_SIZE_SHIFT;
1165 	gpa  = svm->nested.ctl.iopm_base_pa + (port / 8);
1166 	start_bit = port % 8;
1167 	iopm_len = (start_bit + size > 8) ? 2 : 1;
1168 	mask = (0xf >> (4 - size)) << start_bit;
1169 	val = 0;
1170 
1171 	if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
1172 		return NESTED_EXIT_DONE;
1173 
1174 	return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
1175 }
1176 
1177 static int nested_svm_intercept(struct vcpu_svm *svm)
1178 {
1179 	u32 exit_code = svm->vmcb->control.exit_code;
1180 	int vmexit = NESTED_EXIT_HOST;
1181 
1182 	switch (exit_code) {
1183 	case SVM_EXIT_MSR:
1184 		vmexit = nested_svm_exit_handled_msr(svm);
1185 		break;
1186 	case SVM_EXIT_IOIO:
1187 		vmexit = nested_svm_intercept_ioio(svm);
1188 		break;
1189 	case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
1190 		if (vmcb12_is_intercept(&svm->nested.ctl, exit_code))
1191 			vmexit = NESTED_EXIT_DONE;
1192 		break;
1193 	}
1194 	case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
1195 		if (vmcb12_is_intercept(&svm->nested.ctl, exit_code))
1196 			vmexit = NESTED_EXIT_DONE;
1197 		break;
1198 	}
1199 	case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
1200 		/*
1201 		 * Host-intercepted exceptions have been checked already in
1202 		 * nested_svm_exit_special.  There is nothing to do here,
1203 		 * the vmexit is injected by svm_check_nested_events.
1204 		 */
1205 		vmexit = NESTED_EXIT_DONE;
1206 		break;
1207 	}
1208 	case SVM_EXIT_ERR: {
1209 		vmexit = NESTED_EXIT_DONE;
1210 		break;
1211 	}
1212 	default: {
1213 		if (vmcb12_is_intercept(&svm->nested.ctl, exit_code))
1214 			vmexit = NESTED_EXIT_DONE;
1215 	}
1216 	}
1217 
1218 	return vmexit;
1219 }
1220 
1221 int nested_svm_exit_handled(struct vcpu_svm *svm)
1222 {
1223 	int vmexit;
1224 
1225 	vmexit = nested_svm_intercept(svm);
1226 
1227 	if (vmexit == NESTED_EXIT_DONE)
1228 		nested_svm_vmexit(svm);
1229 
1230 	return vmexit;
1231 }
1232 
1233 int nested_svm_check_permissions(struct kvm_vcpu *vcpu)
1234 {
1235 	if (!(vcpu->arch.efer & EFER_SVME) || !is_paging(vcpu)) {
1236 		kvm_queue_exception(vcpu, UD_VECTOR);
1237 		return 1;
1238 	}
1239 
1240 	if (to_svm(vcpu)->vmcb->save.cpl) {
1241 		kvm_inject_gp(vcpu, 0);
1242 		return 1;
1243 	}
1244 
1245 	return 0;
1246 }
1247 
1248 static bool nested_exit_on_exception(struct vcpu_svm *svm)
1249 {
1250 	unsigned int nr = svm->vcpu.arch.exception.nr;
1251 
1252 	return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr));
1253 }
1254 
1255 static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm)
1256 {
1257 	unsigned int nr = svm->vcpu.arch.exception.nr;
1258 	struct vmcb *vmcb = svm->vmcb;
1259 
1260 	vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
1261 	vmcb->control.exit_code_hi = 0;
1262 
1263 	if (svm->vcpu.arch.exception.has_error_code)
1264 		vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code;
1265 
1266 	/*
1267 	 * EXITINFO2 is undefined for all exception intercepts other
1268 	 * than #PF.
1269 	 */
1270 	if (nr == PF_VECTOR) {
1271 		if (svm->vcpu.arch.exception.nested_apf)
1272 			vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
1273 		else if (svm->vcpu.arch.exception.has_payload)
1274 			vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload;
1275 		else
1276 			vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
1277 	} else if (nr == DB_VECTOR) {
1278 		/* See inject_pending_event.  */
1279 		kvm_deliver_exception_payload(&svm->vcpu);
1280 		if (svm->vcpu.arch.dr7 & DR7_GD) {
1281 			svm->vcpu.arch.dr7 &= ~DR7_GD;
1282 			kvm_update_dr7(&svm->vcpu);
1283 		}
1284 	} else
1285 		WARN_ON(svm->vcpu.arch.exception.has_payload);
1286 
1287 	nested_svm_vmexit(svm);
1288 }
1289 
1290 static inline bool nested_exit_on_init(struct vcpu_svm *svm)
1291 {
1292 	return vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_INIT);
1293 }
1294 
1295 static int svm_check_nested_events(struct kvm_vcpu *vcpu)
1296 {
1297 	struct vcpu_svm *svm = to_svm(vcpu);
1298 	bool block_nested_events =
1299 		kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending;
1300 	struct kvm_lapic *apic = vcpu->arch.apic;
1301 
1302 	if (lapic_in_kernel(vcpu) &&
1303 	    test_bit(KVM_APIC_INIT, &apic->pending_events)) {
1304 		if (block_nested_events)
1305 			return -EBUSY;
1306 		if (!nested_exit_on_init(svm))
1307 			return 0;
1308 		nested_svm_simple_vmexit(svm, SVM_EXIT_INIT);
1309 		return 0;
1310 	}
1311 
1312 	if (vcpu->arch.exception.pending) {
1313 		/*
1314 		 * Only a pending nested run can block a pending exception.
1315 		 * Otherwise an injected NMI/interrupt should either be
1316 		 * lost or delivered to the nested hypervisor in the EXITINTINFO
1317 		 * vmcb field, while delivering the pending exception.
1318 		 */
1319 		if (svm->nested.nested_run_pending)
1320                         return -EBUSY;
1321 		if (!nested_exit_on_exception(svm))
1322 			return 0;
1323 		nested_svm_inject_exception_vmexit(svm);
1324 		return 0;
1325 	}
1326 
1327 	if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) {
1328 		if (block_nested_events)
1329 			return -EBUSY;
1330 		if (!nested_exit_on_smi(svm))
1331 			return 0;
1332 		nested_svm_simple_vmexit(svm, SVM_EXIT_SMI);
1333 		return 0;
1334 	}
1335 
1336 	if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) {
1337 		if (block_nested_events)
1338 			return -EBUSY;
1339 		if (!nested_exit_on_nmi(svm))
1340 			return 0;
1341 		nested_svm_simple_vmexit(svm, SVM_EXIT_NMI);
1342 		return 0;
1343 	}
1344 
1345 	if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) {
1346 		if (block_nested_events)
1347 			return -EBUSY;
1348 		if (!nested_exit_on_intr(svm))
1349 			return 0;
1350 		trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
1351 		nested_svm_simple_vmexit(svm, SVM_EXIT_INTR);
1352 		return 0;
1353 	}
1354 
1355 	return 0;
1356 }
1357 
1358 int nested_svm_exit_special(struct vcpu_svm *svm)
1359 {
1360 	u32 exit_code = svm->vmcb->control.exit_code;
1361 
1362 	switch (exit_code) {
1363 	case SVM_EXIT_INTR:
1364 	case SVM_EXIT_NMI:
1365 	case SVM_EXIT_NPF:
1366 		return NESTED_EXIT_HOST;
1367 	case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
1368 		u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
1369 
1370 		if (svm->vmcb01.ptr->control.intercepts[INTERCEPT_EXCEPTION] &
1371 		    excp_bits)
1372 			return NESTED_EXIT_HOST;
1373 		else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR &&
1374 			 svm->vcpu.arch.apf.host_apf_flags)
1375 			/* Trap async PF even if not shadowing */
1376 			return NESTED_EXIT_HOST;
1377 		break;
1378 	}
1379 	default:
1380 		break;
1381 	}
1382 
1383 	return NESTED_EXIT_CONTINUE;
1384 }
1385 
1386 void nested_svm_update_tsc_ratio_msr(struct kvm_vcpu *vcpu)
1387 {
1388 	struct vcpu_svm *svm = to_svm(vcpu);
1389 
1390 	vcpu->arch.tsc_scaling_ratio =
1391 		kvm_calc_nested_tsc_multiplier(vcpu->arch.l1_tsc_scaling_ratio,
1392 					       svm->tsc_ratio_msr);
1393 	__svm_write_tsc_multiplier(vcpu->arch.tsc_scaling_ratio);
1394 }
1395 
1396 /* Inverse operation of nested_copy_vmcb_control_to_cache(). asid is copied too. */
1397 static void nested_copy_vmcb_cache_to_control(struct vmcb_control_area *dst,
1398 					      struct vmcb_ctrl_area_cached *from)
1399 {
1400 	unsigned int i;
1401 
1402 	memset(dst, 0, sizeof(struct vmcb_control_area));
1403 
1404 	for (i = 0; i < MAX_INTERCEPT; i++)
1405 		dst->intercepts[i] = from->intercepts[i];
1406 
1407 	dst->iopm_base_pa         = from->iopm_base_pa;
1408 	dst->msrpm_base_pa        = from->msrpm_base_pa;
1409 	dst->tsc_offset           = from->tsc_offset;
1410 	dst->asid                 = from->asid;
1411 	dst->tlb_ctl              = from->tlb_ctl;
1412 	dst->int_ctl              = from->int_ctl;
1413 	dst->int_vector           = from->int_vector;
1414 	dst->int_state            = from->int_state;
1415 	dst->exit_code            = from->exit_code;
1416 	dst->exit_code_hi         = from->exit_code_hi;
1417 	dst->exit_info_1          = from->exit_info_1;
1418 	dst->exit_info_2          = from->exit_info_2;
1419 	dst->exit_int_info        = from->exit_int_info;
1420 	dst->exit_int_info_err    = from->exit_int_info_err;
1421 	dst->nested_ctl           = from->nested_ctl;
1422 	dst->event_inj            = from->event_inj;
1423 	dst->event_inj_err        = from->event_inj_err;
1424 	dst->nested_cr3           = from->nested_cr3;
1425 	dst->virt_ext              = from->virt_ext;
1426 	dst->pause_filter_count   = from->pause_filter_count;
1427 	dst->pause_filter_thresh  = from->pause_filter_thresh;
1428 	/* 'clean' and 'reserved_sw' are not changed by KVM */
1429 }
1430 
1431 static int svm_get_nested_state(struct kvm_vcpu *vcpu,
1432 				struct kvm_nested_state __user *user_kvm_nested_state,
1433 				u32 user_data_size)
1434 {
1435 	struct vcpu_svm *svm;
1436 	struct vmcb_control_area *ctl;
1437 	unsigned long r;
1438 	struct kvm_nested_state kvm_state = {
1439 		.flags = 0,
1440 		.format = KVM_STATE_NESTED_FORMAT_SVM,
1441 		.size = sizeof(kvm_state),
1442 	};
1443 	struct vmcb __user *user_vmcb = (struct vmcb __user *)
1444 		&user_kvm_nested_state->data.svm[0];
1445 
1446 	if (!vcpu)
1447 		return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE;
1448 
1449 	svm = to_svm(vcpu);
1450 
1451 	if (user_data_size < kvm_state.size)
1452 		goto out;
1453 
1454 	/* First fill in the header and copy it out.  */
1455 	if (is_guest_mode(vcpu)) {
1456 		kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa;
1457 		kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE;
1458 		kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
1459 
1460 		if (svm->nested.nested_run_pending)
1461 			kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING;
1462 	}
1463 
1464 	if (gif_set(svm))
1465 		kvm_state.flags |= KVM_STATE_NESTED_GIF_SET;
1466 
1467 	if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state)))
1468 		return -EFAULT;
1469 
1470 	if (!is_guest_mode(vcpu))
1471 		goto out;
1472 
1473 	/*
1474 	 * Copy over the full size of the VMCB rather than just the size
1475 	 * of the structs.
1476 	 */
1477 	if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE))
1478 		return -EFAULT;
1479 
1480 	ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
1481 	if (!ctl)
1482 		return -ENOMEM;
1483 
1484 	nested_copy_vmcb_cache_to_control(ctl, &svm->nested.ctl);
1485 	r = copy_to_user(&user_vmcb->control, ctl,
1486 			 sizeof(user_vmcb->control));
1487 	kfree(ctl);
1488 	if (r)
1489 		return -EFAULT;
1490 
1491 	if (copy_to_user(&user_vmcb->save, &svm->vmcb01.ptr->save,
1492 			 sizeof(user_vmcb->save)))
1493 		return -EFAULT;
1494 out:
1495 	return kvm_state.size;
1496 }
1497 
1498 static int svm_set_nested_state(struct kvm_vcpu *vcpu,
1499 				struct kvm_nested_state __user *user_kvm_nested_state,
1500 				struct kvm_nested_state *kvm_state)
1501 {
1502 	struct vcpu_svm *svm = to_svm(vcpu);
1503 	struct vmcb __user *user_vmcb = (struct vmcb __user *)
1504 		&user_kvm_nested_state->data.svm[0];
1505 	struct vmcb_control_area *ctl;
1506 	struct vmcb_save_area *save;
1507 	struct vmcb_save_area_cached save_cached;
1508 	struct vmcb_ctrl_area_cached ctl_cached;
1509 	unsigned long cr0;
1510 	int ret;
1511 
1512 	BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) >
1513 		     KVM_STATE_NESTED_SVM_VMCB_SIZE);
1514 
1515 	if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM)
1516 		return -EINVAL;
1517 
1518 	if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE |
1519 				 KVM_STATE_NESTED_RUN_PENDING |
1520 				 KVM_STATE_NESTED_GIF_SET))
1521 		return -EINVAL;
1522 
1523 	/*
1524 	 * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's
1525 	 * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed.
1526 	 */
1527 	if (!(vcpu->arch.efer & EFER_SVME)) {
1528 		/* GIF=1 and no guest mode are required if SVME=0.  */
1529 		if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET)
1530 			return -EINVAL;
1531 	}
1532 
1533 	/* SMM temporarily disables SVM, so we cannot be in guest mode.  */
1534 	if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
1535 		return -EINVAL;
1536 
1537 	if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) {
1538 		svm_leave_nested(vcpu);
1539 		svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET));
1540 		return 0;
1541 	}
1542 
1543 	if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa))
1544 		return -EINVAL;
1545 	if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE)
1546 		return -EINVAL;
1547 
1548 	ret  = -ENOMEM;
1549 	ctl  = kzalloc(sizeof(*ctl),  GFP_KERNEL_ACCOUNT);
1550 	save = kzalloc(sizeof(*save), GFP_KERNEL_ACCOUNT);
1551 	if (!ctl || !save)
1552 		goto out_free;
1553 
1554 	ret = -EFAULT;
1555 	if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl)))
1556 		goto out_free;
1557 	if (copy_from_user(save, &user_vmcb->save, sizeof(*save)))
1558 		goto out_free;
1559 
1560 	ret = -EINVAL;
1561 	__nested_copy_vmcb_control_to_cache(vcpu, &ctl_cached, ctl);
1562 	if (!__nested_vmcb_check_controls(vcpu, &ctl_cached))
1563 		goto out_free;
1564 
1565 	/*
1566 	 * Processor state contains L2 state.  Check that it is
1567 	 * valid for guest mode (see nested_vmcb_check_save).
1568 	 */
1569 	cr0 = kvm_read_cr0(vcpu);
1570         if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW))
1571 		goto out_free;
1572 
1573 	/*
1574 	 * Validate host state saved from before VMRUN (see
1575 	 * nested_svm_check_permissions).
1576 	 */
1577 	__nested_copy_vmcb_save_to_cache(&save_cached, save);
1578 	if (!(save->cr0 & X86_CR0_PG) ||
1579 	    !(save->cr0 & X86_CR0_PE) ||
1580 	    (save->rflags & X86_EFLAGS_VM) ||
1581 	    !__nested_vmcb_check_save(vcpu, &save_cached))
1582 		goto out_free;
1583 
1584 
1585 	/*
1586 	 * All checks done, we can enter guest mode. Userspace provides
1587 	 * vmcb12.control, which will be combined with L1 and stored into
1588 	 * vmcb02, and the L1 save state which we store in vmcb01.
1589 	 * L2 registers if needed are moved from the current VMCB to VMCB02.
1590 	 */
1591 
1592 	if (is_guest_mode(vcpu))
1593 		svm_leave_nested(vcpu);
1594 	else
1595 		svm->nested.vmcb02.ptr->save = svm->vmcb01.ptr->save;
1596 
1597 	svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET));
1598 
1599 	svm->nested.nested_run_pending =
1600 		!!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING);
1601 
1602 	svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa;
1603 
1604 	svm_copy_vmrun_state(&svm->vmcb01.ptr->save, save);
1605 	nested_copy_vmcb_control_to_cache(svm, ctl);
1606 
1607 	svm_switch_vmcb(svm, &svm->nested.vmcb02);
1608 	nested_vmcb02_prepare_control(svm);
1609 
1610 	/*
1611 	 * While the nested guest CR3 is already checked and set by
1612 	 * KVM_SET_SREGS, it was set when nested state was yet loaded,
1613 	 * thus MMU might not be initialized correctly.
1614 	 * Set it again to fix this.
1615 	 */
1616 
1617 	ret = nested_svm_load_cr3(&svm->vcpu, vcpu->arch.cr3,
1618 				  nested_npt_enabled(svm), false);
1619 	if (WARN_ON_ONCE(ret))
1620 		goto out_free;
1621 
1622 	svm->nested.force_msr_bitmap_recalc = true;
1623 
1624 	kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
1625 	ret = 0;
1626 out_free:
1627 	kfree(save);
1628 	kfree(ctl);
1629 
1630 	return ret;
1631 }
1632 
1633 static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu)
1634 {
1635 	struct vcpu_svm *svm = to_svm(vcpu);
1636 
1637 	if (WARN_ON(!is_guest_mode(vcpu)))
1638 		return true;
1639 
1640 	if (!vcpu->arch.pdptrs_from_userspace &&
1641 	    !nested_npt_enabled(svm) && is_pae_paging(vcpu))
1642 		/*
1643 		 * Reload the guest's PDPTRs since after a migration
1644 		 * the guest CR3 might be restored prior to setting the nested
1645 		 * state which can lead to a load of wrong PDPTRs.
1646 		 */
1647 		if (CC(!load_pdptrs(vcpu, vcpu->arch.cr3)))
1648 			return false;
1649 
1650 	if (!nested_svm_vmrun_msrpm(svm)) {
1651 		vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1652 		vcpu->run->internal.suberror =
1653 			KVM_INTERNAL_ERROR_EMULATION;
1654 		vcpu->run->internal.ndata = 0;
1655 		return false;
1656 	}
1657 
1658 	return true;
1659 }
1660 
1661 struct kvm_x86_nested_ops svm_nested_ops = {
1662 	.leave_nested = svm_leave_nested,
1663 	.check_events = svm_check_nested_events,
1664 	.handle_page_fault_workaround = nested_svm_handle_page_fault_workaround,
1665 	.triple_fault = nested_svm_triple_fault,
1666 	.get_nested_state_pages = svm_get_nested_state_pages,
1667 	.get_state = svm_get_nested_state,
1668 	.set_state = svm_set_nested_state,
1669 };
1670