arch/x86/kvm/svm/nested.c

   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  <[email protected]>
  12  *   Avi Kivity   <[email protected]>
  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
  32 static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
  33                                        struct x86_exception *fault)
  34 {
  35         struct vcpu_svm *svm = to_svm(vcpu);
  36
  37         if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) {
  38                 /*
  39                  * TODO: track the cause of the nested page fault, and
  40                  * correctly fill in the high bits of exit_info_1.
  41                  */
  42                 svm->vmcb->control.exit_code = SVM_EXIT_NPF;
  43                 svm->vmcb->control.exit_code_hi = 0;
  44                 svm->vmcb->control.exit_info_1 = (1ULL << 32);
  45                 svm->vmcb->control.exit_info_2 = fault->address;
  46         }
  47
  48         svm->vmcb->control.exit_info_1 &= ~0xffffffffULL;
  49         svm->vmcb->control.exit_info_1 |= fault->error_code;
  50
  51         nested_svm_vmexit(svm);
  52 }
  53
  54 static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
  55 {
  56         struct vcpu_svm *svm = to_svm(vcpu);
  57         u64 cr3 = svm->nested.ctl.nested_cr3;
  58         u64 pdpte;
  59         int ret;
  60
  61         ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(__sme_clr(cr3)), &pdpte,
  62                                        offset_in_page(cr3) + index * 8, 8);
  63         if (ret)
  64                 return 0;
  65         return pdpte;
  66 }
  67
  68 static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
  69 {
  70         struct vcpu_svm *svm = to_svm(vcpu);
  71
  72         return svm->nested.ctl.nested_cr3;
  73 }
  74
  75 static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
  76 {
  77         struct vcpu_svm *svm = to_svm(vcpu);
  78         struct vmcb *hsave = svm->nested.hsave;
  79
  80         WARN_ON(mmu_is_nested(vcpu));
  81
  82         vcpu->arch.mmu = &vcpu->arch.guest_mmu;
  83         kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, hsave->save.cr4, hsave->save.efer,
  84                                 svm->nested.ctl.nested_cr3);
  85         vcpu->arch.mmu->get_guest_pgd     = nested_svm_get_tdp_cr3;
  86         vcpu->arch.mmu->get_pdptr         = nested_svm_get_tdp_pdptr;
  87         vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit;
  88         reset_shadow_zero_bits_mask(vcpu, vcpu->arch.mmu);
  89         vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
  90 }
  91
  92 static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
  93 {
  94         vcpu->arch.mmu = &vcpu->arch.root_mmu;
  95         vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
  96 }
  97
  98 void recalc_intercepts(struct vcpu_svm *svm)
  99 {
 100         struct vmcb_control_area *c, *h, *g;
 101
 102         vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 103
 104         if (!is_guest_mode(&svm->vcpu))
 105                 return;
 106
 107         c = &svm->vmcb->control;
 108         h = &svm->nested.hsave->control;
 109         g = &svm->nested.ctl;
 110
 111         svm->nested.host_intercept_exceptions = h->intercept_exceptions;
 112
 113         c->intercept_cr = h->intercept_cr;
 114         c->intercept_dr = h->intercept_dr;
 115         c->intercept_exceptions = h->intercept_exceptions;
 116         c->intercept = h->intercept;
 117
 118         if (g->int_ctl & V_INTR_MASKING_MASK) {
 119                 /* We only want the cr8 intercept bits of L1 */
 120                 c->intercept_cr &= ~(1U << INTERCEPT_CR8_READ);
 121                 c->intercept_cr &= ~(1U << INTERCEPT_CR8_WRITE);
 122
 123                 /*
 124                  * Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not
 125                  * affect any interrupt we may want to inject; therefore,
 126                  * interrupt window vmexits are irrelevant to L0.
 127                  */
 128                 c->intercept &= ~(1ULL << INTERCEPT_VINTR);
 129         }
 130
 131         /* We don't want to see VMMCALLs from a nested guest */
 132         c->intercept &= ~(1ULL << INTERCEPT_VMMCALL);
 133
 134         c->intercept_cr |= g->intercept_cr;
 135         c->intercept_dr |= g->intercept_dr;
 136         c->intercept_exceptions |= g->intercept_exceptions;
 137         c->intercept |= g->intercept;
 138 }
 139
 140 static void copy_vmcb_control_area(struct vmcb_control_area *dst,
 141                                    struct vmcb_control_area *from)
 142 {
 143         dst->intercept_cr         = from->intercept_cr;
 144         dst->intercept_dr         = from->intercept_dr;
 145         dst->intercept_exceptions = from->intercept_exceptions;
 146         dst->intercept            = from->intercept;
 147         dst->iopm_base_pa         = from->iopm_base_pa;
 148         dst->msrpm_base_pa        = from->msrpm_base_pa;
 149         dst->tsc_offset           = from->tsc_offset;
 150         /* asid not copied, it is handled manually for svm->vmcb.  */
 151         dst->tlb_ctl              = from->tlb_ctl;
 152         dst->int_ctl              = from->int_ctl;
 153         dst->int_vector           = from->int_vector;
 154         dst->int_state            = from->int_state;
 155         dst->exit_code            = from->exit_code;
 156         dst->exit_code_hi         = from->exit_code_hi;
 157         dst->exit_info_1          = from->exit_info_1;
 158         dst->exit_info_2          = from->exit_info_2;
 159         dst->exit_int_info        = from->exit_int_info;
 160         dst->exit_int_info_err    = from->exit_int_info_err;
 161         dst->nested_ctl           = from->nested_ctl;
 162         dst->event_inj            = from->event_inj;
 163         dst->event_inj_err        = from->event_inj_err;
 164         dst->nested_cr3           = from->nested_cr3;
 165         dst->virt_ext              = from->virt_ext;
 166         dst->pause_filter_count   = from->pause_filter_count;
 167         dst->pause_filter_thresh  = from->pause_filter_thresh;
 168 }
 169
 170 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
 171 {
 172         /*
 173          * This function merges the msr permission bitmaps of kvm and the
 174          * nested vmcb. It is optimized in that it only merges the parts where
 175          * the kvm msr permission bitmap may contain zero bits
 176          */
 177         int i;
 178
 179         if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_MSR_PROT)))
 180                 return true;
 181
 182         for (i = 0; i < MSRPM_OFFSETS; i++) {
 183                 u32 value, p;
 184                 u64 offset;
 185
 186                 if (msrpm_offsets[i] == 0xffffffff)
 187                         break;
 188
 189                 p      = msrpm_offsets[i];
 190                 offset = svm->nested.ctl.msrpm_base_pa + (p * 4);
 191
 192                 if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
 193                         return false;
 194
 195                 svm->nested.msrpm[p] = svm->msrpm[p] | value;
 196         }
 197
 198         svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm));
 199
 200         return true;
 201 }
 202
 203 static bool nested_vmcb_check_controls(struct vmcb_control_area *control)
 204 {
 205         if ((control->intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
 206                 return false;
 207
 208         if (control->asid == 0)
 209                 return false;
 210
 211         if ((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) &&
 212             !npt_enabled)
 213                 return false;
 214
 215         return true;
 216 }
 217
 218 static bool nested_vmcb_checks(struct vcpu_svm *svm, struct vmcb *vmcb)
 219 {
 220         bool nested_vmcb_lma;
 221         if ((vmcb->save.efer & EFER_SVME) == 0)
 222                 return false;
 223
 224         if (((vmcb->save.cr0 & X86_CR0_CD) == 0) &&
 225             (vmcb->save.cr0 & X86_CR0_NW))
 226                 return false;
 227
 228         if (!kvm_dr6_valid(vmcb->save.dr6) || !kvm_dr7_valid(vmcb->save.dr7))
 229                 return false;
 230
 231         nested_vmcb_lma =
 232                 (vmcb->save.efer & EFER_LME) &&
 233                 (vmcb->save.cr0 & X86_CR0_PG);
 234
 235         if (!nested_vmcb_lma) {
 236                 if (vmcb->save.cr4 & X86_CR4_PAE) {
 237                         if (vmcb->save.cr3 & MSR_CR3_LEGACY_PAE_RESERVED_MASK)
 238                                 return false;
 239                 } else {
 240                         if (vmcb->save.cr3 & MSR_CR3_LEGACY_RESERVED_MASK)
 241                                 return false;
 242                 }
 243         } else {
 244                 if (!(vmcb->save.cr4 & X86_CR4_PAE) ||
 245                     !(vmcb->save.cr0 & X86_CR0_PE) ||
 246                     (vmcb->save.cr3 & MSR_CR3_LONG_RESERVED_MASK))
 247                         return false;
 248         }
 249         if (kvm_valid_cr4(&svm->vcpu, vmcb->save.cr4))
 250                 return false;
 251
 252         return nested_vmcb_check_controls(&vmcb->control);
 253 }
 254
 255 static void load_nested_vmcb_control(struct vcpu_svm *svm,
 256                                      struct vmcb_control_area *control)
 257 {
 258         copy_vmcb_control_area(&svm->nested.ctl, control);
 259
 260         /* Copy it here because nested_svm_check_controls will check it.  */
 261         svm->nested.ctl.asid           = control->asid;
 262         svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL;
 263         svm->nested.ctl.iopm_base_pa  &= ~0x0fffULL;
 264 }
 265
 266 /*
 267  * Synchronize fields that are written by the processor, so that
 268  * they can be copied back into the nested_vmcb.
 269  */
 270 void sync_nested_vmcb_control(struct vcpu_svm *svm)
 271 {
 272         u32 mask;
 273         svm->nested.ctl.event_inj      = svm->vmcb->control.event_inj;
 274         svm->nested.ctl.event_inj_err  = svm->vmcb->control.event_inj_err;
 275
 276         /* Only a few fields of int_ctl are written by the processor.  */
 277         mask = V_IRQ_MASK | V_TPR_MASK;
 278         if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) &&
 279             svm_is_intercept(svm, INTERCEPT_VINTR)) {
 280                 /*
 281                  * In order to request an interrupt window, L0 is usurping
 282                  * svm->vmcb->control.int_ctl and possibly setting V_IRQ
 283                  * even if it was clear in L1's VMCB.  Restoring it would be
 284                  * wrong.  However, in this case V_IRQ will remain true until
 285                  * interrupt_window_interception calls svm_clear_vintr and
 286                  * restores int_ctl.  We can just leave it aside.
 287                  */
 288                 mask &= ~V_IRQ_MASK;
 289         }
 290         svm->nested.ctl.int_ctl        &= ~mask;
 291         svm->nested.ctl.int_ctl        |= svm->vmcb->control.int_ctl & mask;
 292 }
 293
 294 /*
 295  * Transfer any event that L0 or L1 wanted to inject into L2 to
 296  * EXIT_INT_INFO.
 297  */
 298 static void nested_vmcb_save_pending_event(struct vcpu_svm *svm,
 299                                            struct vmcb *nested_vmcb)
 300 {
 301         struct kvm_vcpu *vcpu = &svm->vcpu;
 302         u32 exit_int_info = 0;
 303         unsigned int nr;
 304
 305         if (vcpu->arch.exception.injected) {
 306                 nr = vcpu->arch.exception.nr;
 307                 exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT;
 308
 309                 if (vcpu->arch.exception.has_error_code) {
 310                         exit_int_info |= SVM_EVTINJ_VALID_ERR;
 311                         nested_vmcb->control.exit_int_info_err =
 312                                 vcpu->arch.exception.error_code;
 313                 }
 314
 315         } else if (vcpu->arch.nmi_injected) {
 316                 exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
 317
 318         } else if (vcpu->arch.interrupt.injected) {
 319                 nr = vcpu->arch.interrupt.nr;
 320                 exit_int_info = nr | SVM_EVTINJ_VALID;
 321
 322                 if (vcpu->arch.interrupt.soft)
 323                         exit_int_info |= SVM_EVTINJ_TYPE_SOFT;
 324                 else
 325                         exit_int_info |= SVM_EVTINJ_TYPE_INTR;
 326         }
 327
 328         nested_vmcb->control.exit_int_info = exit_int_info;
 329 }
 330
 331 static inline bool nested_npt_enabled(struct vcpu_svm *svm)
 332 {
 333         return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE;
 334 }
 335
 336 /*
 337  * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true
 338  * if we are emulating VM-Entry into a guest with NPT enabled.
 339  */
 340 static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
 341                                bool nested_npt)
 342 {
 343         if (cr3 & rsvd_bits(cpuid_maxphyaddr(vcpu), 63))
 344                 return -EINVAL;
 345
 346         if (!nested_npt && is_pae_paging(vcpu) &&
 347             (cr3 != kvm_read_cr3(vcpu) || pdptrs_changed(vcpu))) {
 348                 if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
 349                         return -EINVAL;
 350         }
 351
 352         /*
 353          * TODO: optimize unconditional TLB flush/MMU sync here and in
 354          * kvm_init_shadow_npt_mmu().
 355          */
 356         if (!nested_npt)
 357                 kvm_mmu_new_pgd(vcpu, cr3, false, false);
 358
 359         vcpu->arch.cr3 = cr3;
 360         kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
 361
 362         kvm_init_mmu(vcpu, false);
 363
 364         return 0;
 365 }
 366
 367 static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *nested_vmcb)
 368 {
 369         /* Load the nested guest state */
 370         svm->vmcb->save.es = nested_vmcb->save.es;
 371         svm->vmcb->save.cs = nested_vmcb->save.cs;
 372         svm->vmcb->save.ss = nested_vmcb->save.ss;
 373         svm->vmcb->save.ds = nested_vmcb->save.ds;
 374         svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
 375         svm->vmcb->save.idtr = nested_vmcb->save.idtr;
 376         kvm_set_rflags(&svm->vcpu, nested_vmcb->save.rflags);
 377         svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
 378         svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
 379         svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
 380         svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
 381         kvm_rax_write(&svm->vcpu, nested_vmcb->save.rax);
 382         kvm_rsp_write(&svm->vcpu, nested_vmcb->save.rsp);
 383         kvm_rip_write(&svm->vcpu, nested_vmcb->save.rip);
 384
 385         /* In case we don't even reach vcpu_run, the fields are not updated */
 386         svm->vmcb->save.rax = nested_vmcb->save.rax;
 387         svm->vmcb->save.rsp = nested_vmcb->save.rsp;
 388         svm->vmcb->save.rip = nested_vmcb->save.rip;
 389         svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
 390         svm->vcpu.arch.dr6  = nested_vmcb->save.dr6;
 391         svm->vmcb->save.cpl = nested_vmcb->save.cpl;
 392 }
 393
 394 static void nested_prepare_vmcb_control(struct vcpu_svm *svm)
 395 {
 396         const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK;
 397
 398         if (nested_npt_enabled(svm))
 399                 nested_svm_init_mmu_context(&svm->vcpu);
 400
 401         svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset =
 402                 svm->vcpu.arch.l1_tsc_offset + svm->nested.ctl.tsc_offset;
 403
 404         svm->vmcb->control.int_ctl             =
 405                 (svm->nested.ctl.int_ctl & ~mask) |
 406                 (svm->nested.hsave->control.int_ctl & mask);
 407
 408         svm->vmcb->control.virt_ext            = svm->nested.ctl.virt_ext;
 409         svm->vmcb->control.int_vector          = svm->nested.ctl.int_vector;
 410         svm->vmcb->control.int_state           = svm->nested.ctl.int_state;
 411         svm->vmcb->control.event_inj           = svm->nested.ctl.event_inj;
 412         svm->vmcb->control.event_inj_err       = svm->nested.ctl.event_inj_err;
 413
 414         svm->vmcb->control.pause_filter_count  = svm->nested.ctl.pause_filter_count;
 415         svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh;
 416
 417         /* Enter Guest-Mode */
 418         enter_guest_mode(&svm->vcpu);
 419
 420         /*
 421          * Merge guest and host intercepts - must be called  with vcpu in
 422          * guest-mode to take affect here
 423          */
 424         recalc_intercepts(svm);
 425
 426         vmcb_mark_all_dirty(svm->vmcb);
 427 }
 428
 429 int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
 430                           struct vmcb *nested_vmcb)
 431 {
 432         int ret;
 433
 434         svm->nested.vmcb = vmcb_gpa;
 435         load_nested_vmcb_control(svm, &nested_vmcb->control);
 436         nested_prepare_vmcb_save(svm, nested_vmcb);
 437         nested_prepare_vmcb_control(svm);
 438
 439         ret = nested_svm_load_cr3(&svm->vcpu, nested_vmcb->save.cr3,
 440                                   nested_npt_enabled(svm));
 441         if (ret)
 442                 return ret;
 443
 444         svm_set_gif(svm, true);
 445
 446         return 0;
 447 }
 448
 449 int nested_svm_vmrun(struct vcpu_svm *svm)
 450 {
 451         int ret;
 452         struct vmcb *nested_vmcb;
 453         struct vmcb *hsave = svm->nested.hsave;
 454         struct vmcb *vmcb = svm->vmcb;
 455         struct kvm_host_map map;
 456         u64 vmcb_gpa;
 457
 458         if (is_smm(&svm->vcpu)) {
 459                 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
 460                 return 1;
 461         }
 462
 463         vmcb_gpa = svm->vmcb->save.rax;
 464         ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map);
 465         if (ret == -EINVAL) {
 466                 kvm_inject_gp(&svm->vcpu, 0);
 467                 return 1;
 468         } else if (ret) {
 469                 return kvm_skip_emulated_instruction(&svm->vcpu);
 470         }
 471
 472         ret = kvm_skip_emulated_instruction(&svm->vcpu);
 473
 474         nested_vmcb = map.hva;
 475
 476         if (!nested_vmcb_checks(svm, nested_vmcb)) {
 477                 nested_vmcb->control.exit_code    = SVM_EXIT_ERR;
 478                 nested_vmcb->control.exit_code_hi = 0;
 479                 nested_vmcb->control.exit_info_1  = 0;
 480                 nested_vmcb->control.exit_info_2  = 0;
 481                 goto out;
 482         }
 483
 484         trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
 485                                nested_vmcb->save.rip,
 486                                nested_vmcb->control.int_ctl,
 487                                nested_vmcb->control.event_inj,
 488                                nested_vmcb->control.nested_ctl);
 489
 490         trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr & 0xffff,
 491                                     nested_vmcb->control.intercept_cr >> 16,
 492                                     nested_vmcb->control.intercept_exceptions,
 493                                     nested_vmcb->control.intercept);
 494
 495         /* Clear internal status */
 496         kvm_clear_exception_queue(&svm->vcpu);
 497         kvm_clear_interrupt_queue(&svm->vcpu);
 498
 499         /*
 500          * Save the old vmcb, so we don't need to pick what we save, but can
 501          * restore everything when a VMEXIT occurs
 502          */
 503         hsave->save.es     = vmcb->save.es;
 504         hsave->save.cs     = vmcb->save.cs;
 505         hsave->save.ss     = vmcb->save.ss;
 506         hsave->save.ds     = vmcb->save.ds;
 507         hsave->save.gdtr   = vmcb->save.gdtr;
 508         hsave->save.idtr   = vmcb->save.idtr;
 509         hsave->save.efer   = svm->vcpu.arch.efer;
 510         hsave->save.cr0    = kvm_read_cr0(&svm->vcpu);
 511         hsave->save.cr4    = svm->vcpu.arch.cr4;
 512         hsave->save.rflags = kvm_get_rflags(&svm->vcpu);
 513         hsave->save.rip    = kvm_rip_read(&svm->vcpu);
 514         hsave->save.rsp    = vmcb->save.rsp;
 515         hsave->save.rax    = vmcb->save.rax;
 516         if (npt_enabled)
 517                 hsave->save.cr3    = vmcb->save.cr3;
 518         else
 519                 hsave->save.cr3    = kvm_read_cr3(&svm->vcpu);
 520
 521         copy_vmcb_control_area(&hsave->control, &vmcb->control);
 522
 523         svm->nested.nested_run_pending = 1;
 524
 525         if (enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb))
 526                 goto out_exit_err;
 527
 528         if (nested_svm_vmrun_msrpm(svm))
 529                 goto out;
 530
 531 out_exit_err:
 532         svm->nested.nested_run_pending = 0;
 533
 534         svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
 535         svm->vmcb->control.exit_code_hi = 0;
 536         svm->vmcb->control.exit_info_1  = 0;
 537         svm->vmcb->control.exit_info_2  = 0;
 538
 539         nested_svm_vmexit(svm);
 540
 541 out:
 542         kvm_vcpu_unmap(&svm->vcpu, &map, true);
 543
 544         return ret;
 545 }
 546
 547 void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
 548 {
 549         to_vmcb->save.fs = from_vmcb->save.fs;
 550         to_vmcb->save.gs = from_vmcb->save.gs;
 551         to_vmcb->save.tr = from_vmcb->save.tr;
 552         to_vmcb->save.ldtr = from_vmcb->save.ldtr;
 553         to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
 554         to_vmcb->save.star = from_vmcb->save.star;
 555         to_vmcb->save.lstar = from_vmcb->save.lstar;
 556         to_vmcb->save.cstar = from_vmcb->save.cstar;
 557         to_vmcb->save.sfmask = from_vmcb->save.sfmask;
 558         to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
 559         to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
 560         to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
 561 }
 562
 563 int nested_svm_vmexit(struct vcpu_svm *svm)
 564 {
 565         int rc;
 566         struct vmcb *nested_vmcb;
 567         struct vmcb *hsave = svm->nested.hsave;
 568         struct vmcb *vmcb = svm->vmcb;
 569         struct kvm_host_map map;
 570
 571         rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb), &map);
 572         if (rc) {
 573                 if (rc == -EINVAL)
 574                         kvm_inject_gp(&svm->vcpu, 0);
 575                 return 1;
 576         }
 577
 578         nested_vmcb = map.hva;
 579
 580         /* Exit Guest-Mode */
 581         leave_guest_mode(&svm->vcpu);
 582         svm->nested.vmcb = 0;
 583         WARN_ON_ONCE(svm->nested.nested_run_pending);
 584
 585         /* in case we halted in L2 */
 586         svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE;
 587
 588         /* Give the current vmcb to the guest */
 589         svm_set_gif(svm, false);
 590
 591         nested_vmcb->save.es     = vmcb->save.es;
 592         nested_vmcb->save.cs     = vmcb->save.cs;
 593         nested_vmcb->save.ss     = vmcb->save.ss;
 594         nested_vmcb->save.ds     = vmcb->save.ds;
 595         nested_vmcb->save.gdtr   = vmcb->save.gdtr;
 596         nested_vmcb->save.idtr   = vmcb->save.idtr;
 597         nested_vmcb->save.efer   = svm->vcpu.arch.efer;
 598         nested_vmcb->save.cr0    = kvm_read_cr0(&svm->vcpu);
 599         nested_vmcb->save.cr3    = kvm_read_cr3(&svm->vcpu);
 600         nested_vmcb->save.cr2    = vmcb->save.cr2;
 601         nested_vmcb->save.cr4    = svm->vcpu.arch.cr4;
 602         nested_vmcb->save.rflags = kvm_get_rflags(&svm->vcpu);
 603         nested_vmcb->save.rip    = kvm_rip_read(&svm->vcpu);
 604         nested_vmcb->save.rsp    = kvm_rsp_read(&svm->vcpu);
 605         nested_vmcb->save.rax    = kvm_rax_read(&svm->vcpu);
 606         nested_vmcb->save.dr7    = vmcb->save.dr7;
 607         nested_vmcb->save.dr6    = svm->vcpu.arch.dr6;
 608         nested_vmcb->save.cpl    = vmcb->save.cpl;
 609
 610         nested_vmcb->control.int_state         = vmcb->control.int_state;
 611         nested_vmcb->control.exit_code         = vmcb->control.exit_code;
 612         nested_vmcb->control.exit_code_hi      = vmcb->control.exit_code_hi;
 613         nested_vmcb->control.exit_info_1       = vmcb->control.exit_info_1;
 614         nested_vmcb->control.exit_info_2       = vmcb->control.exit_info_2;
 615
 616         if (nested_vmcb->control.exit_code != SVM_EXIT_ERR)
 617                 nested_vmcb_save_pending_event(svm, nested_vmcb);
 618
 619         if (svm->nrips_enabled)
 620                 nested_vmcb->control.next_rip  = vmcb->control.next_rip;
 621
 622         nested_vmcb->control.int_ctl           = svm->nested.ctl.int_ctl;
 623         nested_vmcb->control.tlb_ctl           = svm->nested.ctl.tlb_ctl;
 624         nested_vmcb->control.event_inj         = svm->nested.ctl.event_inj;
 625         nested_vmcb->control.event_inj_err     = svm->nested.ctl.event_inj_err;
 626
 627         nested_vmcb->control.pause_filter_count =
 628                 svm->vmcb->control.pause_filter_count;
 629         nested_vmcb->control.pause_filter_thresh =
 630                 svm->vmcb->control.pause_filter_thresh;
 631
 632         /* Restore the original control entries */
 633         copy_vmcb_control_area(&vmcb->control, &hsave->control);
 634
 635         svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset =
 636                 svm->vcpu.arch.l1_tsc_offset;
 637
 638         svm->nested.ctl.nested_cr3 = 0;
 639
 640         /* Restore selected save entries */
 641         svm->vmcb->save.es = hsave->save.es;
 642         svm->vmcb->save.cs = hsave->save.cs;
 643         svm->vmcb->save.ss = hsave->save.ss;
 644         svm->vmcb->save.ds = hsave->save.ds;
 645         svm->vmcb->save.gdtr = hsave->save.gdtr;
 646         svm->vmcb->save.idtr = hsave->save.idtr;
 647         kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
 648         svm_set_efer(&svm->vcpu, hsave->save.efer);
 649         svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
 650         svm_set_cr4(&svm->vcpu, hsave->save.cr4);
 651         kvm_rax_write(&svm->vcpu, hsave->save.rax);
 652         kvm_rsp_write(&svm->vcpu, hsave->save.rsp);
 653         kvm_rip_write(&svm->vcpu, hsave->save.rip);
 654         svm->vmcb->save.dr7 = 0;
 655         svm->vmcb->save.cpl = 0;
 656         svm->vmcb->control.exit_int_info = 0;
 657
 658         vmcb_mark_all_dirty(svm->vmcb);
 659
 660         trace_kvm_nested_vmexit_inject(nested_vmcb->control.exit_code,
 661                                        nested_vmcb->control.exit_info_1,
 662                                        nested_vmcb->control.exit_info_2,
 663                                        nested_vmcb->control.exit_int_info,
 664                                        nested_vmcb->control.exit_int_info_err,
 665                                        KVM_ISA_SVM);
 666
 667         kvm_vcpu_unmap(&svm->vcpu, &map, true);
 668
 669         nested_svm_uninit_mmu_context(&svm->vcpu);
 670
 671         rc = nested_svm_load_cr3(&svm->vcpu, hsave->save.cr3, false);
 672         if (rc)
 673                 return 1;
 674
 675         if (npt_enabled)
 676                 svm->vmcb->save.cr3 = hsave->save.cr3;
 677
 678         /*
 679          * Drop what we picked up for L2 via svm_complete_interrupts() so it
 680          * doesn't end up in L1.
 681          */
 682         svm->vcpu.arch.nmi_injected = false;
 683         kvm_clear_exception_queue(&svm->vcpu);
 684         kvm_clear_interrupt_queue(&svm->vcpu);
 685
 686         return 0;
 687 }
 688
 689 /*
 690  * Forcibly leave nested mode in order to be able to reset the VCPU later on.
 691  */
 692 void svm_leave_nested(struct vcpu_svm *svm)
 693 {
 694         if (is_guest_mode(&svm->vcpu)) {
 695                 struct vmcb *hsave = svm->nested.hsave;
 696                 struct vmcb *vmcb = svm->vmcb;
 697
 698                 svm->nested.nested_run_pending = 0;
 699                 leave_guest_mode(&svm->vcpu);
 700                 copy_vmcb_control_area(&vmcb->control, &hsave->control);
 701                 nested_svm_uninit_mmu_context(&svm->vcpu);
 702         }
 703 }
 704
 705 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
 706 {
 707         u32 offset, msr, value;
 708         int write, mask;
 709
 710         if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_MSR_PROT)))
 711                 return NESTED_EXIT_HOST;
 712
 713         msr    = svm->vcpu.arch.regs[VCPU_REGS_RCX];
 714         offset = svm_msrpm_offset(msr);
 715         write  = svm->vmcb->control.exit_info_1 & 1;
 716         mask   = 1 << ((2 * (msr & 0xf)) + write);
 717
 718         if (offset == MSR_INVALID)
 719                 return NESTED_EXIT_DONE;
 720
 721         /* Offset is in 32 bit units but need in 8 bit units */
 722         offset *= 4;
 723
 724         if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4))
 725                 return NESTED_EXIT_DONE;
 726
 727         return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
 728 }
 729
 730 static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
 731 {
 732         unsigned port, size, iopm_len;
 733         u16 val, mask;
 734         u8 start_bit;
 735         u64 gpa;
 736
 737         if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
 738                 return NESTED_EXIT_HOST;
 739
 740         port = svm->vmcb->control.exit_info_1 >> 16;
 741         size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
 742                 SVM_IOIO_SIZE_SHIFT;
 743         gpa  = svm->nested.ctl.iopm_base_pa + (port / 8);
 744         start_bit = port % 8;
 745         iopm_len = (start_bit + size > 8) ? 2 : 1;
 746         mask = (0xf >> (4 - size)) << start_bit;
 747         val = 0;
 748
 749         if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
 750                 return NESTED_EXIT_DONE;
 751
 752         return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
 753 }
 754
 755 static int nested_svm_intercept(struct vcpu_svm *svm)
 756 {
 757         u32 exit_code = svm->vmcb->control.exit_code;
 758         int vmexit = NESTED_EXIT_HOST;
 759
 760         switch (exit_code) {
 761         case SVM_EXIT_MSR:
 762                 vmexit = nested_svm_exit_handled_msr(svm);
 763                 break;
 764         case SVM_EXIT_IOIO:
 765                 vmexit = nested_svm_intercept_ioio(svm);
 766                 break;
 767         case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
 768                 u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0);
 769                 if (svm->nested.ctl.intercept_cr & bit)
 770                         vmexit = NESTED_EXIT_DONE;
 771                 break;
 772         }
 773         case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
 774                 u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
 775                 if (svm->nested.ctl.intercept_dr & bit)
 776                         vmexit = NESTED_EXIT_DONE;
 777                 break;
 778         }
 779         case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
 780                 /*
 781                  * Host-intercepted exceptions have been checked already in
 782                  * nested_svm_exit_special.  There is nothing to do here,
 783                  * the vmexit is injected by svm_check_nested_events.
 784                  */
 785                 vmexit = NESTED_EXIT_DONE;
 786                 break;
 787         }
 788         case SVM_EXIT_ERR: {
 789                 vmexit = NESTED_EXIT_DONE;
 790                 break;
 791         }
 792         default: {
 793                 u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
 794                 if (svm->nested.ctl.intercept & exit_bits)
 795                         vmexit = NESTED_EXIT_DONE;
 796         }
 797         }
 798
 799         return vmexit;
 800 }
 801
 802 int nested_svm_exit_handled(struct vcpu_svm *svm)
 803 {
 804         int vmexit;
 805
 806         vmexit = nested_svm_intercept(svm);
 807
 808         if (vmexit == NESTED_EXIT_DONE)
 809                 nested_svm_vmexit(svm);
 810
 811         return vmexit;
 812 }
 813
 814 int nested_svm_check_permissions(struct vcpu_svm *svm)
 815 {
 816         if (!(svm->vcpu.arch.efer & EFER_SVME) ||
 817             !is_paging(&svm->vcpu)) {
 818                 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
 819                 return 1;
 820         }
 821
 822         if (svm->vmcb->save.cpl) {
 823                 kvm_inject_gp(&svm->vcpu, 0);
 824                 return 1;
 825         }
 826
 827         return 0;
 828 }
 829
 830 static bool nested_exit_on_exception(struct vcpu_svm *svm)
 831 {
 832         unsigned int nr = svm->vcpu.arch.exception.nr;
 833
 834         return (svm->nested.ctl.intercept_exceptions & (1 << nr));
 835 }
 836
 837 static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm)
 838 {
 839         unsigned int nr = svm->vcpu.arch.exception.nr;
 840
 841         svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
 842         svm->vmcb->control.exit_code_hi = 0;
 843
 844         if (svm->vcpu.arch.exception.has_error_code)
 845                 svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code;
 846
 847         /*
 848          * EXITINFO2 is undefined for all exception intercepts other
 849          * than #PF.
 850          */
 851         if (nr == PF_VECTOR) {
 852                 if (svm->vcpu.arch.exception.nested_apf)
 853                         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
 854                 else if (svm->vcpu.arch.exception.has_payload)
 855                         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload;
 856                 else
 857                         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
 858         } else if (nr == DB_VECTOR) {
 859                 /* See inject_pending_event.  */
 860                 kvm_deliver_exception_payload(&svm->vcpu);
 861                 if (svm->vcpu.arch.dr7 & DR7_GD) {
 862                         svm->vcpu.arch.dr7 &= ~DR7_GD;
 863                         kvm_update_dr7(&svm->vcpu);
 864                 }
 865         } else
 866                 WARN_ON(svm->vcpu.arch.exception.has_payload);
 867
 868         nested_svm_vmexit(svm);
 869 }
 870
 871 static void nested_svm_smi(struct vcpu_svm *svm)
 872 {
 873         svm->vmcb->control.exit_code = SVM_EXIT_SMI;
 874         svm->vmcb->control.exit_info_1 = 0;
 875         svm->vmcb->control.exit_info_2 = 0;
 876
 877         nested_svm_vmexit(svm);
 878 }
 879
 880 static void nested_svm_nmi(struct vcpu_svm *svm)
 881 {
 882         svm->vmcb->control.exit_code = SVM_EXIT_NMI;
 883         svm->vmcb->control.exit_info_1 = 0;
 884         svm->vmcb->control.exit_info_2 = 0;
 885
 886         nested_svm_vmexit(svm);
 887 }
 888
 889 static void nested_svm_intr(struct vcpu_svm *svm)
 890 {
 891         trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
 892
 893         svm->vmcb->control.exit_code   = SVM_EXIT_INTR;
 894         svm->vmcb->control.exit_info_1 = 0;
 895         svm->vmcb->control.exit_info_2 = 0;
 896
 897         nested_svm_vmexit(svm);
 898 }
 899
 900 static inline bool nested_exit_on_init(struct vcpu_svm *svm)
 901 {
 902         return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_INIT));
 903 }
 904
 905 static void nested_svm_init(struct vcpu_svm *svm)
 906 {
 907         svm->vmcb->control.exit_code   = SVM_EXIT_INIT;
 908         svm->vmcb->control.exit_info_1 = 0;
 909         svm->vmcb->control.exit_info_2 = 0;
 910
 911         nested_svm_vmexit(svm);
 912 }
 913
 914
 915 static int svm_check_nested_events(struct kvm_vcpu *vcpu)
 916 {
 917         struct vcpu_svm *svm = to_svm(vcpu);
 918         bool block_nested_events =
 919                 kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending;
 920         struct kvm_lapic *apic = vcpu->arch.apic;
 921
 922         if (lapic_in_kernel(vcpu) &&
 923             test_bit(KVM_APIC_INIT, &apic->pending_events)) {
 924                 if (block_nested_events)
 925                         return -EBUSY;
 926                 if (!nested_exit_on_init(svm))
 927                         return 0;
 928                 nested_svm_init(svm);
 929                 return 0;
 930         }
 931
 932         if (vcpu->arch.exception.pending) {
 933                 if (block_nested_events)
 934                         return -EBUSY;
 935                 if (!nested_exit_on_exception(svm))
 936                         return 0;
 937                 nested_svm_inject_exception_vmexit(svm);
 938                 return 0;
 939         }
 940
 941         if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) {
 942                 if (block_nested_events)
 943                         return -EBUSY;
 944                 if (!nested_exit_on_smi(svm))
 945                         return 0;
 946                 nested_svm_smi(svm);
 947                 return 0;
 948         }
 949
 950         if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) {
 951                 if (block_nested_events)
 952                         return -EBUSY;
 953                 if (!nested_exit_on_nmi(svm))
 954                         return 0;
 955                 nested_svm_nmi(svm);
 956                 return 0;
 957         }
 958
 959         if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) {
 960                 if (block_nested_events)
 961                         return -EBUSY;
 962                 if (!nested_exit_on_intr(svm))
 963                         return 0;
 964                 nested_svm_intr(svm);
 965                 return 0;
 966         }
 967
 968         return 0;
 969 }
 970
 971 int nested_svm_exit_special(struct vcpu_svm *svm)
 972 {
 973         u32 exit_code = svm->vmcb->control.exit_code;
 974
 975         switch (exit_code) {
 976         case SVM_EXIT_INTR:
 977         case SVM_EXIT_NMI:
 978         case SVM_EXIT_NPF:
 979                 return NESTED_EXIT_HOST;
 980         case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
 981                 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
 982
 983                 if (get_host_vmcb(svm)->control.intercept_exceptions & excp_bits)
 984                         return NESTED_EXIT_HOST;
 985                 else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR &&
 986                          svm->vcpu.arch.apf.host_apf_flags)
 987                         /* Trap async PF even if not shadowing */
 988                         return NESTED_EXIT_HOST;
 989                 break;
 990         }
 991         default:
 992                 break;
 993         }
 994
 995         return NESTED_EXIT_CONTINUE;
 996 }
 997
 998 static int svm_get_nested_state(struct kvm_vcpu *vcpu,
 999                                 struct kvm_nested_state __user *user_kvm_nested_state,
1000                                 u32 user_data_size)
1001 {
1002         struct vcpu_svm *svm;
1003         struct kvm_nested_state kvm_state = {
1004                 .flags = 0,
1005                 .format = KVM_STATE_NESTED_FORMAT_SVM,
1006                 .size = sizeof(kvm_state),
1007         };
1008         struct vmcb __user *user_vmcb = (struct vmcb __user *)
1009                 &user_kvm_nested_state->data.svm[0];
1010
1011         if (!vcpu)
1012                 return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE;
1013
1014         svm = to_svm(vcpu);
1015
1016         if (user_data_size < kvm_state.size)
1017                 goto out;
1018
1019         /* First fill in the header and copy it out.  */
1020         if (is_guest_mode(vcpu)) {
1021                 kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb;
1022                 kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE;
1023                 kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
1024
1025                 if (svm->nested.nested_run_pending)
1026                         kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING;
1027         }
1028
1029         if (gif_set(svm))
1030                 kvm_state.flags |= KVM_STATE_NESTED_GIF_SET;
1031
1032         if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state)))
1033                 return -EFAULT;
1034
1035         if (!is_guest_mode(vcpu))
1036                 goto out;
1037
1038         /*
1039          * Copy over the full size of the VMCB rather than just the size
1040          * of the structs.
1041          */
1042         if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE))
1043                 return -EFAULT;
1044         if (copy_to_user(&user_vmcb->control, &svm->nested.ctl,
1045                          sizeof(user_vmcb->control)))
1046                 return -EFAULT;
1047         if (copy_to_user(&user_vmcb->save, &svm->nested.hsave->save,
1048                          sizeof(user_vmcb->save)))
1049                 return -EFAULT;
1050
1051 out:
1052         return kvm_state.size;
1053 }
1054
1055 static int svm_set_nested_state(struct kvm_vcpu *vcpu,
1056                                 struct kvm_nested_state __user *user_kvm_nested_state,
1057                                 struct kvm_nested_state *kvm_state)
1058 {
1059         struct vcpu_svm *svm = to_svm(vcpu);
1060         struct vmcb *hsave = svm->nested.hsave;
1061         struct vmcb __user *user_vmcb = (struct vmcb __user *)
1062                 &user_kvm_nested_state->data.svm[0];
1063         struct vmcb_control_area *ctl;
1064         struct vmcb_save_area *save;
1065         int ret;
1066         u32 cr0;
1067
1068         BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) >
1069                      KVM_STATE_NESTED_SVM_VMCB_SIZE);
1070
1071         if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM)
1072                 return -EINVAL;
1073
1074         if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE |
1075                                  KVM_STATE_NESTED_RUN_PENDING |
1076                                  KVM_STATE_NESTED_GIF_SET))
1077                 return -EINVAL;
1078
1079         /*
1080          * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's
1081          * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed.
1082          */
1083         if (!(vcpu->arch.efer & EFER_SVME)) {
1084                 /* GIF=1 and no guest mode are required if SVME=0.  */
1085                 if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET)
1086                         return -EINVAL;
1087         }
1088
1089         /* SMM temporarily disables SVM, so we cannot be in guest mode.  */
1090         if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
1091                 return -EINVAL;
1092
1093         if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) {
1094                 svm_leave_nested(svm);
1095                 goto out_set_gif;
1096         }
1097
1098         if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa))
1099                 return -EINVAL;
1100         if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE)
1101                 return -EINVAL;
1102
1103         ret  = -ENOMEM;
1104         ctl  = kzalloc(sizeof(*ctl),  GFP_KERNEL);
1105         save = kzalloc(sizeof(*save), GFP_KERNEL);
1106         if (!ctl || !save)
1107                 goto out_free;
1108
1109         ret = -EFAULT;
1110         if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl)))
1111                 goto out_free;
1112         if (copy_from_user(save, &user_vmcb->save, sizeof(*save)))
1113                 goto out_free;
1114
1115         ret = -EINVAL;
1116         if (!nested_vmcb_check_controls(ctl))
1117                 goto out_free;
1118
1119         /*
1120          * Processor state contains L2 state.  Check that it is
1121          * valid for guest mode (see nested_vmcb_checks).
1122          */
1123         cr0 = kvm_read_cr0(vcpu);
1124         if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW))
1125                 goto out_free;
1126
1127         /*
1128          * Validate host state saved from before VMRUN (see
1129          * nested_svm_check_permissions).
1130          * TODO: validate reserved bits for all saved state.
1131          */
1132         if (!(save->cr0 & X86_CR0_PG))
1133                 goto out_free;
1134
1135         /*
1136          * All checks done, we can enter guest mode.  L1 control fields
1137          * come from the nested save state.  Guest state is already
1138          * in the registers, the save area of the nested state instead
1139          * contains saved L1 state.
1140          */
1141         copy_vmcb_control_area(&hsave->control, &svm->vmcb->control);
1142         hsave->save = *save;
1143
1144         svm->nested.vmcb = kvm_state->hdr.svm.vmcb_pa;
1145         load_nested_vmcb_control(svm, ctl);
1146         nested_prepare_vmcb_control(svm);
1147
1148 out_set_gif:
1149         svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET));
1150
1151         ret = 0;
1152 out_free:
1153         kfree(save);
1154         kfree(ctl);
1155
1156         return ret;
1157 }
1158
1159 struct kvm_x86_nested_ops svm_nested_ops = {
1160         .check_events = svm_check_nested_events,
1161         .get_state = svm_get_nested_state,
1162         .set_state = svm_set_nested_state,
1163 };