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  <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
  32 #define CC KVM_NESTED_VMENTER_CONSISTENCY_CHECK
  33
  34 static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
  35                                        struct x86_exception *fault)
  36 {
  37         struct vcpu_svm *svm = to_svm(vcpu);
  38
  39         if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) {
  40                 /*
  41                  * TODO: track the cause of the nested page fault, and
  42                  * correctly fill in the high bits of exit_info_1.
  43                  */
  44                 svm->vmcb->control.exit_code = SVM_EXIT_NPF;
  45                 svm->vmcb->control.exit_code_hi = 0;
  46                 svm->vmcb->control.exit_info_1 = (1ULL << 32);
  47                 svm->vmcb->control.exit_info_2 = fault->address;
  48         }
  49
  50         svm->vmcb->control.exit_info_1 &= ~0xffffffffULL;
  51         svm->vmcb->control.exit_info_1 |= fault->error_code;
  52
  53         nested_svm_vmexit(svm);
  54 }
  55
  56 static void svm_inject_page_fault_nested(struct kvm_vcpu *vcpu, struct x86_exception *fault)
  57 {
  58        struct vcpu_svm *svm = to_svm(vcpu);
  59        WARN_ON(!is_guest_mode(vcpu));
  60
  61        if (vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_EXCEPTION_OFFSET + PF_VECTOR) &&
  62            !svm->nested.nested_run_pending) {
  63                svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + PF_VECTOR;
  64                svm->vmcb->control.exit_code_hi = 0;
  65                svm->vmcb->control.exit_info_1 = fault->error_code;
  66                svm->vmcb->control.exit_info_2 = fault->address;
  67                nested_svm_vmexit(svm);
  68        } else {
  69                kvm_inject_page_fault(vcpu, fault);
  70        }
  71 }
  72
  73 static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
  74 {
  75         struct vcpu_svm *svm = to_svm(vcpu);
  76         u64 cr3 = svm->nested.ctl.nested_cr3;
  77         u64 pdpte;
  78         int ret;
  79
  80         ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(cr3), &pdpte,
  81                                        offset_in_page(cr3) + index * 8, 8);
  82         if (ret)
  83                 return 0;
  84         return pdpte;
  85 }
  86
  87 static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
  88 {
  89         struct vcpu_svm *svm = to_svm(vcpu);
  90
  91         return svm->nested.ctl.nested_cr3;
  92 }
  93
  94 static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
  95 {
  96         struct vcpu_svm *svm = to_svm(vcpu);
  97
  98         WARN_ON(mmu_is_nested(vcpu));
  99
 100         vcpu->arch.mmu = &vcpu->arch.guest_mmu;
 101
 102         /*
 103          * The NPT format depends on L1's CR4 and EFER, which is in vmcb01.  Note,
 104          * when called via KVM_SET_NESTED_STATE, that state may _not_ match current
 105          * vCPU state.  CR0.WP is explicitly ignored, while CR0.PG is required.
 106          */
 107         kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, svm->vmcb01.ptr->save.cr4,
 108                                 svm->vmcb01.ptr->save.efer,
 109                                 svm->nested.ctl.nested_cr3);
 110         vcpu->arch.mmu->get_guest_pgd     = nested_svm_get_tdp_cr3;
 111         vcpu->arch.mmu->get_pdptr         = nested_svm_get_tdp_pdptr;
 112         vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit;
 113         vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
 114 }
 115
 116 static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
 117 {
 118         vcpu->arch.mmu = &vcpu->arch.root_mmu;
 119         vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
 120 }
 121
 122 void recalc_intercepts(struct vcpu_svm *svm)
 123 {
 124         struct vmcb_control_area *c, *h, *g;
 125         unsigned int i;
 126
 127         vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 128
 129         if (!is_guest_mode(&svm->vcpu))
 130                 return;
 131
 132         c = &svm->vmcb->control;
 133         h = &svm->vmcb01.ptr->control;
 134         g = &svm->nested.ctl;
 135
 136         for (i = 0; i < MAX_INTERCEPT; i++)
 137                 c->intercepts[i] = h->intercepts[i];
 138
 139         if (g->int_ctl & V_INTR_MASKING_MASK) {
 140                 /* We only want the cr8 intercept bits of L1 */
 141                 vmcb_clr_intercept(c, INTERCEPT_CR8_READ);
 142                 vmcb_clr_intercept(c, INTERCEPT_CR8_WRITE);
 143
 144                 /*
 145                  * Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not
 146                  * affect any interrupt we may want to inject; therefore,
 147                  * interrupt window vmexits are irrelevant to L0.
 148                  */
 149                 vmcb_clr_intercept(c, INTERCEPT_VINTR);
 150         }
 151
 152         /* We don't want to see VMMCALLs from a nested guest */
 153         vmcb_clr_intercept(c, INTERCEPT_VMMCALL);
 154
 155         for (i = 0; i < MAX_INTERCEPT; i++)
 156                 c->intercepts[i] |= g->intercepts[i];
 157
 158         /* If SMI is not intercepted, ignore guest SMI intercept as well  */
 159         if (!intercept_smi)
 160                 vmcb_clr_intercept(c, INTERCEPT_SMI);
 161 }
 162
 163 static void copy_vmcb_control_area(struct vmcb_control_area *dst,
 164                                    struct vmcb_control_area *from)
 165 {
 166         unsigned int i;
 167
 168         for (i = 0; i < MAX_INTERCEPT; i++)
 169                 dst->intercepts[i] = from->intercepts[i];
 170
 171         dst->iopm_base_pa         = from->iopm_base_pa;
 172         dst->msrpm_base_pa        = from->msrpm_base_pa;
 173         dst->tsc_offset           = from->tsc_offset;
 174         /* asid not copied, it is handled manually for svm->vmcb.  */
 175         dst->tlb_ctl              = from->tlb_ctl;
 176         dst->int_ctl              = from->int_ctl;
 177         dst->int_vector           = from->int_vector;
 178         dst->int_state            = from->int_state;
 179         dst->exit_code            = from->exit_code;
 180         dst->exit_code_hi         = from->exit_code_hi;
 181         dst->exit_info_1          = from->exit_info_1;
 182         dst->exit_info_2          = from->exit_info_2;
 183         dst->exit_int_info        = from->exit_int_info;
 184         dst->exit_int_info_err    = from->exit_int_info_err;
 185         dst->nested_ctl           = from->nested_ctl;
 186         dst->event_inj            = from->event_inj;
 187         dst->event_inj_err        = from->event_inj_err;
 188         dst->nested_cr3           = from->nested_cr3;
 189         dst->virt_ext              = from->virt_ext;
 190         dst->pause_filter_count   = from->pause_filter_count;
 191         dst->pause_filter_thresh  = from->pause_filter_thresh;
 192 }
 193
 194 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
 195 {
 196         /*
 197          * This function merges the msr permission bitmaps of kvm and the
 198          * nested vmcb. It is optimized in that it only merges the parts where
 199          * the kvm msr permission bitmap may contain zero bits
 200          */
 201         int i;
 202
 203         if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
 204                 return true;
 205
 206         for (i = 0; i < MSRPM_OFFSETS; i++) {
 207                 u32 value, p;
 208                 u64 offset;
 209
 210                 if (msrpm_offsets[i] == 0xffffffff)
 211                         break;
 212
 213                 p      = msrpm_offsets[i];
 214                 offset = svm->nested.ctl.msrpm_base_pa + (p * 4);
 215
 216                 if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
 217                         return false;
 218
 219                 svm->nested.msrpm[p] = svm->msrpm[p] | value;
 220         }
 221
 222         svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm));
 223
 224         return true;
 225 }
 226
 227 /*
 228  * Bits 11:0 of bitmap address are ignored by hardware
 229  */
 230 static bool nested_svm_check_bitmap_pa(struct kvm_vcpu *vcpu, u64 pa, u32 size)
 231 {
 232         u64 addr = PAGE_ALIGN(pa);
 233
 234         return kvm_vcpu_is_legal_gpa(vcpu, addr) &&
 235             kvm_vcpu_is_legal_gpa(vcpu, addr + size - 1);
 236 }
 237
 238 static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu,
 239                                        struct vmcb_control_area *control)
 240 {
 241         if (CC(!vmcb_is_intercept(control, INTERCEPT_VMRUN)))
 242                 return false;
 243
 244         if (CC(control->asid == 0))
 245                 return false;
 246
 247         if (CC((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && !npt_enabled))
 248                 return false;
 249
 250         if (CC(!nested_svm_check_bitmap_pa(vcpu, control->msrpm_base_pa,
 251                                            MSRPM_SIZE)))
 252                 return false;
 253         if (CC(!nested_svm_check_bitmap_pa(vcpu, control->iopm_base_pa,
 254                                            IOPM_SIZE)))
 255                 return false;
 256
 257         return true;
 258 }
 259
 260 static bool nested_vmcb_check_cr3_cr4(struct kvm_vcpu *vcpu,
 261                                       struct vmcb_save_area *save)
 262 {
 263         /*
 264          * These checks are also performed by KVM_SET_SREGS,
 265          * except that EFER.LMA is not checked by SVM against
 266          * CR0.PG && EFER.LME.
 267          */
 268         if ((save->efer & EFER_LME) && (save->cr0 & X86_CR0_PG)) {
 269                 if (CC(!(save->cr4 & X86_CR4_PAE)) ||
 270                     CC(!(save->cr0 & X86_CR0_PE)) ||
 271                     CC(kvm_vcpu_is_illegal_gpa(vcpu, save->cr3)))
 272                         return false;
 273         }
 274
 275         if (CC(!kvm_is_valid_cr4(vcpu, save->cr4)))
 276                 return false;
 277
 278         return true;
 279 }
 280
 281 /* Common checks that apply to both L1 and L2 state.  */
 282 static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu,
 283                                     struct vmcb_save_area *save)
 284 {
 285         /*
 286          * FIXME: these should be done after copying the fields,
 287          * to avoid TOC/TOU races.  For these save area checks
 288          * the possible damage is limited since kvm_set_cr0 and
 289          * kvm_set_cr4 handle failure; EFER_SVME is an exception
 290          * so it is force-set later in nested_prepare_vmcb_save.
 291          */
 292         if (CC(!(save->efer & EFER_SVME)))
 293                 return false;
 294
 295         if (CC((save->cr0 & X86_CR0_CD) == 0 && (save->cr0 & X86_CR0_NW)) ||
 296             CC(save->cr0 & ~0xffffffffULL))
 297                 return false;
 298
 299         if (CC(!kvm_dr6_valid(save->dr6)) || CC(!kvm_dr7_valid(save->dr7)))
 300                 return false;
 301
 302         if (!nested_vmcb_check_cr3_cr4(vcpu, save))
 303                 return false;
 304
 305         if (CC(!kvm_valid_efer(vcpu, save->efer)))
 306                 return false;
 307
 308         return true;
 309 }
 310
 311 void nested_load_control_from_vmcb12(struct vcpu_svm *svm,
 312                                      struct vmcb_control_area *control)
 313 {
 314         copy_vmcb_control_area(&svm->nested.ctl, control);
 315
 316         /* Copy it here because nested_svm_check_controls will check it.  */
 317         svm->nested.ctl.asid           = control->asid;
 318         svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL;
 319         svm->nested.ctl.iopm_base_pa  &= ~0x0fffULL;
 320 }
 321
 322 /*
 323  * Synchronize fields that are written by the processor, so that
 324  * they can be copied back into the vmcb12.
 325  */
 326 void nested_sync_control_from_vmcb02(struct vcpu_svm *svm)
 327 {
 328         u32 mask;
 329         svm->nested.ctl.event_inj      = svm->vmcb->control.event_inj;
 330         svm->nested.ctl.event_inj_err  = svm->vmcb->control.event_inj_err;
 331
 332         /* Only a few fields of int_ctl are written by the processor.  */
 333         mask = V_IRQ_MASK | V_TPR_MASK;
 334         if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) &&
 335             svm_is_intercept(svm, INTERCEPT_VINTR)) {
 336                 /*
 337                  * In order to request an interrupt window, L0 is usurping
 338                  * svm->vmcb->control.int_ctl and possibly setting V_IRQ
 339                  * even if it was clear in L1's VMCB.  Restoring it would be
 340                  * wrong.  However, in this case V_IRQ will remain true until
 341                  * interrupt_window_interception calls svm_clear_vintr and
 342                  * restores int_ctl.  We can just leave it aside.
 343                  */
 344                 mask &= ~V_IRQ_MASK;
 345         }
 346         svm->nested.ctl.int_ctl        &= ~mask;
 347         svm->nested.ctl.int_ctl        |= svm->vmcb->control.int_ctl & mask;
 348 }
 349
 350 /*
 351  * Transfer any event that L0 or L1 wanted to inject into L2 to
 352  * EXIT_INT_INFO.
 353  */
 354 static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm,
 355                                                 struct vmcb *vmcb12)
 356 {
 357         struct kvm_vcpu *vcpu = &svm->vcpu;
 358         u32 exit_int_info = 0;
 359         unsigned int nr;
 360
 361         if (vcpu->arch.exception.injected) {
 362                 nr = vcpu->arch.exception.nr;
 363                 exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT;
 364
 365                 if (vcpu->arch.exception.has_error_code) {
 366                         exit_int_info |= SVM_EVTINJ_VALID_ERR;
 367                         vmcb12->control.exit_int_info_err =
 368                                 vcpu->arch.exception.error_code;
 369                 }
 370
 371         } else if (vcpu->arch.nmi_injected) {
 372                 exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
 373
 374         } else if (vcpu->arch.interrupt.injected) {
 375                 nr = vcpu->arch.interrupt.nr;
 376                 exit_int_info = nr | SVM_EVTINJ_VALID;
 377
 378                 if (vcpu->arch.interrupt.soft)
 379                         exit_int_info |= SVM_EVTINJ_TYPE_SOFT;
 380                 else
 381                         exit_int_info |= SVM_EVTINJ_TYPE_INTR;
 382         }
 383
 384         vmcb12->control.exit_int_info = exit_int_info;
 385 }
 386
 387 static inline bool nested_npt_enabled(struct vcpu_svm *svm)
 388 {
 389         return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE;
 390 }
 391
 392 static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu)
 393 {
 394         /*
 395          * TODO: optimize unconditional TLB flush/MMU sync.  A partial list of
 396          * things to fix before this can be conditional:
 397          *
 398          *  - Flush TLBs for both L1 and L2 remote TLB flush
 399          *  - Honor L1's request to flush an ASID on nested VMRUN
 400          *  - Sync nested NPT MMU on VMRUN that flushes L2's ASID[*]
 401          *  - Don't crush a pending TLB flush in vmcb02 on nested VMRUN
 402          *  - Flush L1's ASID on KVM_REQ_TLB_FLUSH_GUEST
 403          *
 404          * [*] Unlike nested EPT, SVM's ASID management can invalidate nested
 405          *     NPT guest-physical mappings on VMRUN.
 406          */
 407         kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
 408         kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
 409 }
 410
 411 /*
 412  * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true
 413  * if we are emulating VM-Entry into a guest with NPT enabled.
 414  */
 415 static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
 416                                bool nested_npt, bool reload_pdptrs)
 417 {
 418         if (CC(kvm_vcpu_is_illegal_gpa(vcpu, cr3)))
 419                 return -EINVAL;
 420
 421         if (reload_pdptrs && !nested_npt && is_pae_paging(vcpu) &&
 422             CC(!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)))
 423                 return -EINVAL;
 424
 425         if (!nested_npt)
 426                 kvm_mmu_new_pgd(vcpu, cr3);
 427
 428         vcpu->arch.cr3 = cr3;
 429         kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
 430
 431         /* Re-initialize the MMU, e.g. to pick up CR4 MMU role changes. */
 432         kvm_init_mmu(vcpu);
 433
 434         return 0;
 435 }
 436
 437 void nested_vmcb02_compute_g_pat(struct vcpu_svm *svm)
 438 {
 439         if (!svm->nested.vmcb02.ptr)
 440                 return;
 441
 442         /* FIXME: merge g_pat from vmcb01 and vmcb12.  */
 443         svm->nested.vmcb02.ptr->save.g_pat = svm->vmcb01.ptr->save.g_pat;
 444 }
 445
 446 static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12)
 447 {
 448         bool new_vmcb12 = false;
 449
 450         nested_vmcb02_compute_g_pat(svm);
 451
 452         /* Load the nested guest state */
 453         if (svm->nested.vmcb12_gpa != svm->nested.last_vmcb12_gpa) {
 454                 new_vmcb12 = true;
 455                 svm->nested.last_vmcb12_gpa = svm->nested.vmcb12_gpa;
 456         }
 457
 458         if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_SEG))) {
 459                 svm->vmcb->save.es = vmcb12->save.es;
 460                 svm->vmcb->save.cs = vmcb12->save.cs;
 461                 svm->vmcb->save.ss = vmcb12->save.ss;
 462                 svm->vmcb->save.ds = vmcb12->save.ds;
 463                 svm->vmcb->save.cpl = vmcb12->save.cpl;
 464                 vmcb_mark_dirty(svm->vmcb, VMCB_SEG);
 465         }
 466
 467         if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DT))) {
 468                 svm->vmcb->save.gdtr = vmcb12->save.gdtr;
 469                 svm->vmcb->save.idtr = vmcb12->save.idtr;
 470                 vmcb_mark_dirty(svm->vmcb, VMCB_DT);
 471         }
 472
 473         kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED);
 474
 475         /*
 476          * Force-set EFER_SVME even though it is checked earlier on the
 477          * VMCB12, because the guest can flip the bit between the check
 478          * and now.  Clearing EFER_SVME would call svm_free_nested.
 479          */
 480         svm_set_efer(&svm->vcpu, vmcb12->save.efer | EFER_SVME);
 481
 482         svm_set_cr0(&svm->vcpu, vmcb12->save.cr0);
 483         svm_set_cr4(&svm->vcpu, vmcb12->save.cr4);
 484
 485         svm->vcpu.arch.cr2 = vmcb12->save.cr2;
 486
 487         kvm_rax_write(&svm->vcpu, vmcb12->save.rax);
 488         kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp);
 489         kvm_rip_write(&svm->vcpu, vmcb12->save.rip);
 490
 491         /* In case we don't even reach vcpu_run, the fields are not updated */
 492         svm->vmcb->save.rax = vmcb12->save.rax;
 493         svm->vmcb->save.rsp = vmcb12->save.rsp;
 494         svm->vmcb->save.rip = vmcb12->save.rip;
 495
 496         /* These bits will be set properly on the first execution when new_vmc12 is true */
 497         if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DR))) {
 498                 svm->vmcb->save.dr7 = vmcb12->save.dr7 | DR7_FIXED_1;
 499                 svm->vcpu.arch.dr6  = vmcb12->save.dr6 | DR6_ACTIVE_LOW;
 500                 vmcb_mark_dirty(svm->vmcb, VMCB_DR);
 501         }
 502 }
 503
 504 static void nested_vmcb02_prepare_control(struct vcpu_svm *svm)
 505 {
 506         const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK;
 507         struct kvm_vcpu *vcpu = &svm->vcpu;
 508
 509         /*
 510          * Filled at exit: exit_code, exit_code_hi, exit_info_1, exit_info_2,
 511          * exit_int_info, exit_int_info_err, next_rip, insn_len, insn_bytes.
 512          */
 513
 514         /*
 515          * Also covers avic_vapic_bar, avic_backing_page, avic_logical_id,
 516          * avic_physical_id.
 517          */
 518         WARN_ON(kvm_apicv_activated(svm->vcpu.kvm));
 519
 520         /* Copied from vmcb01.  msrpm_base can be overwritten later.  */
 521         svm->vmcb->control.nested_ctl = svm->vmcb01.ptr->control.nested_ctl;
 522         svm->vmcb->control.iopm_base_pa = svm->vmcb01.ptr->control.iopm_base_pa;
 523         svm->vmcb->control.msrpm_base_pa = svm->vmcb01.ptr->control.msrpm_base_pa;
 524
 525         /* Done at vmrun: asid.  */
 526
 527         /* Also overwritten later if necessary.  */
 528         svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
 529
 530         /* nested_cr3.  */
 531         if (nested_npt_enabled(svm))
 532                 nested_svm_init_mmu_context(vcpu);
 533
 534         svm->vmcb->control.tsc_offset = vcpu->arch.tsc_offset =
 535                 vcpu->arch.l1_tsc_offset + svm->nested.ctl.tsc_offset;
 536
 537         svm->vmcb->control.int_ctl             =
 538                 (svm->nested.ctl.int_ctl & ~mask) |
 539                 (svm->vmcb01.ptr->control.int_ctl & mask);
 540
 541         svm->vmcb->control.virt_ext            = svm->nested.ctl.virt_ext;
 542         svm->vmcb->control.int_vector          = svm->nested.ctl.int_vector;
 543         svm->vmcb->control.int_state           = svm->nested.ctl.int_state;
 544         svm->vmcb->control.event_inj           = svm->nested.ctl.event_inj;
 545         svm->vmcb->control.event_inj_err       = svm->nested.ctl.event_inj_err;
 546
 547         svm->vmcb->control.pause_filter_count  = svm->nested.ctl.pause_filter_count;
 548         svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh;
 549
 550         nested_svm_transition_tlb_flush(vcpu);
 551
 552         /* Enter Guest-Mode */
 553         enter_guest_mode(vcpu);
 554
 555         /*
 556          * Merge guest and host intercepts - must be called with vcpu in
 557          * guest-mode to take effect.
 558          */
 559         recalc_intercepts(svm);
 560 }
 561
 562 static void nested_svm_copy_common_state(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
 563 {
 564         /*
 565          * Some VMCB state is shared between L1 and L2 and thus has to be
 566          * moved at the time of nested vmrun and vmexit.
 567          *
 568          * VMLOAD/VMSAVE state would also belong in this category, but KVM
 569          * always performs VMLOAD and VMSAVE from the VMCB01.
 570          */
 571         to_vmcb->save.spec_ctrl = from_vmcb->save.spec_ctrl;
 572 }
 573
 574 int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa,
 575                          struct vmcb *vmcb12)
 576 {
 577         struct vcpu_svm *svm = to_svm(vcpu);
 578         int ret;
 579
 580         trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa,
 581                                vmcb12->save.rip,
 582                                vmcb12->control.int_ctl,
 583                                vmcb12->control.event_inj,
 584                                vmcb12->control.nested_ctl);
 585
 586         trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff,
 587                                     vmcb12->control.intercepts[INTERCEPT_CR] >> 16,
 588                                     vmcb12->control.intercepts[INTERCEPT_EXCEPTION],
 589                                     vmcb12->control.intercepts[INTERCEPT_WORD3],
 590                                     vmcb12->control.intercepts[INTERCEPT_WORD4],
 591                                     vmcb12->control.intercepts[INTERCEPT_WORD5]);
 592
 593
 594         svm->nested.vmcb12_gpa = vmcb12_gpa;
 595
 596         WARN_ON(svm->vmcb == svm->nested.vmcb02.ptr);
 597
 598         nested_svm_copy_common_state(svm->vmcb01.ptr, svm->nested.vmcb02.ptr);
 599
 600         svm_switch_vmcb(svm, &svm->nested.vmcb02);
 601         nested_vmcb02_prepare_control(svm);
 602         nested_vmcb02_prepare_save(svm, vmcb12);
 603
 604         ret = nested_svm_load_cr3(&svm->vcpu, vmcb12->save.cr3,
 605                                   nested_npt_enabled(svm), true);
 606         if (ret)
 607                 return ret;
 608
 609         if (!npt_enabled)
 610                 vcpu->arch.mmu->inject_page_fault = svm_inject_page_fault_nested;
 611
 612         svm_set_gif(svm, true);
 613
 614         return 0;
 615 }
 616
 617 int nested_svm_vmrun(struct kvm_vcpu *vcpu)
 618 {
 619         struct vcpu_svm *svm = to_svm(vcpu);
 620         int ret;
 621         struct vmcb *vmcb12;
 622         struct kvm_host_map map;
 623         u64 vmcb12_gpa;
 624
 625         if (!svm->nested.hsave_msr) {
 626                 kvm_inject_gp(vcpu, 0);
 627                 return 1;
 628         }
 629
 630         if (is_smm(vcpu)) {
 631                 kvm_queue_exception(vcpu, UD_VECTOR);
 632                 return 1;
 633         }
 634
 635         vmcb12_gpa = svm->vmcb->save.rax;
 636         ret = kvm_vcpu_map(vcpu, gpa_to_gfn(vmcb12_gpa), &map);
 637         if (ret == -EINVAL) {
 638                 kvm_inject_gp(vcpu, 0);
 639                 return 1;
 640         } else if (ret) {
 641                 return kvm_skip_emulated_instruction(vcpu);
 642         }
 643
 644         ret = kvm_skip_emulated_instruction(vcpu);
 645
 646         vmcb12 = map.hva;
 647
 648         if (WARN_ON_ONCE(!svm->nested.initialized))
 649                 return -EINVAL;
 650
 651         nested_load_control_from_vmcb12(svm, &vmcb12->control);
 652
 653         if (!nested_vmcb_valid_sregs(vcpu, &vmcb12->save) ||
 654             !nested_vmcb_check_controls(vcpu, &svm->nested.ctl)) {
 655                 vmcb12->control.exit_code    = SVM_EXIT_ERR;
 656                 vmcb12->control.exit_code_hi = 0;
 657                 vmcb12->control.exit_info_1  = 0;
 658                 vmcb12->control.exit_info_2  = 0;
 659                 goto out;
 660         }
 661
 662
 663         /* Clear internal status */
 664         kvm_clear_exception_queue(vcpu);
 665         kvm_clear_interrupt_queue(vcpu);
 666
 667         /*
 668          * Since vmcb01 is not in use, we can use it to store some of the L1
 669          * state.
 670          */
 671         svm->vmcb01.ptr->save.efer   = vcpu->arch.efer;
 672         svm->vmcb01.ptr->save.cr0    = kvm_read_cr0(vcpu);
 673         svm->vmcb01.ptr->save.cr4    = vcpu->arch.cr4;
 674         svm->vmcb01.ptr->save.rflags = kvm_get_rflags(vcpu);
 675         svm->vmcb01.ptr->save.rip    = kvm_rip_read(vcpu);
 676
 677         if (!npt_enabled)
 678                 svm->vmcb01.ptr->save.cr3 = kvm_read_cr3(vcpu);
 679
 680         svm->nested.nested_run_pending = 1;
 681
 682         if (enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12))
 683                 goto out_exit_err;
 684
 685         if (nested_svm_vmrun_msrpm(svm))
 686                 goto out;
 687
 688 out_exit_err:
 689         svm->nested.nested_run_pending = 0;
 690
 691         svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
 692         svm->vmcb->control.exit_code_hi = 0;
 693         svm->vmcb->control.exit_info_1  = 0;
 694         svm->vmcb->control.exit_info_2  = 0;
 695
 696         nested_svm_vmexit(svm);
 697
 698 out:
 699         kvm_vcpu_unmap(vcpu, &map, true);
 700
 701         return ret;
 702 }
 703
 704 /* Copy state save area fields which are handled by VMRUN */
 705 void svm_copy_vmrun_state(struct vmcb_save_area *to_save,
 706                           struct vmcb_save_area *from_save)
 707 {
 708         to_save->es = from_save->es;
 709         to_save->cs = from_save->cs;
 710         to_save->ss = from_save->ss;
 711         to_save->ds = from_save->ds;
 712         to_save->gdtr = from_save->gdtr;
 713         to_save->idtr = from_save->idtr;
 714         to_save->rflags = from_save->rflags | X86_EFLAGS_FIXED;
 715         to_save->efer = from_save->efer;
 716         to_save->cr0 = from_save->cr0;
 717         to_save->cr3 = from_save->cr3;
 718         to_save->cr4 = from_save->cr4;
 719         to_save->rax = from_save->rax;
 720         to_save->rsp = from_save->rsp;
 721         to_save->rip = from_save->rip;
 722         to_save->cpl = 0;
 723 }
 724
 725 void svm_copy_vmloadsave_state(struct vmcb *to_vmcb, struct vmcb *from_vmcb)
 726 {
 727         to_vmcb->save.fs = from_vmcb->save.fs;
 728         to_vmcb->save.gs = from_vmcb->save.gs;
 729         to_vmcb->save.tr = from_vmcb->save.tr;
 730         to_vmcb->save.ldtr = from_vmcb->save.ldtr;
 731         to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
 732         to_vmcb->save.star = from_vmcb->save.star;
 733         to_vmcb->save.lstar = from_vmcb->save.lstar;
 734         to_vmcb->save.cstar = from_vmcb->save.cstar;
 735         to_vmcb->save.sfmask = from_vmcb->save.sfmask;
 736         to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
 737         to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
 738         to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
 739 }
 740
 741 int nested_svm_vmexit(struct vcpu_svm *svm)
 742 {
 743         struct kvm_vcpu *vcpu = &svm->vcpu;
 744         struct vmcb *vmcb12;
 745         struct vmcb *vmcb = svm->vmcb;
 746         struct kvm_host_map map;
 747         int rc;
 748
 749         /* Triple faults in L2 should never escape. */
 750         WARN_ON_ONCE(kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu));
 751
 752         rc = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map);
 753         if (rc) {
 754                 if (rc == -EINVAL)
 755                         kvm_inject_gp(vcpu, 0);
 756                 return 1;
 757         }
 758
 759         vmcb12 = map.hva;
 760
 761         /* Exit Guest-Mode */
 762         leave_guest_mode(vcpu);
 763         svm->nested.vmcb12_gpa = 0;
 764         WARN_ON_ONCE(svm->nested.nested_run_pending);
 765
 766         kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
 767
 768         /* in case we halted in L2 */
 769         svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE;
 770
 771         /* Give the current vmcb to the guest */
 772
 773         vmcb12->save.es     = vmcb->save.es;
 774         vmcb12->save.cs     = vmcb->save.cs;
 775         vmcb12->save.ss     = vmcb->save.ss;
 776         vmcb12->save.ds     = vmcb->save.ds;
 777         vmcb12->save.gdtr   = vmcb->save.gdtr;
 778         vmcb12->save.idtr   = vmcb->save.idtr;
 779         vmcb12->save.efer   = svm->vcpu.arch.efer;
 780         vmcb12->save.cr0    = kvm_read_cr0(vcpu);
 781         vmcb12->save.cr3    = kvm_read_cr3(vcpu);
 782         vmcb12->save.cr2    = vmcb->save.cr2;
 783         vmcb12->save.cr4    = svm->vcpu.arch.cr4;
 784         vmcb12->save.rflags = kvm_get_rflags(vcpu);
 785         vmcb12->save.rip    = kvm_rip_read(vcpu);
 786         vmcb12->save.rsp    = kvm_rsp_read(vcpu);
 787         vmcb12->save.rax    = kvm_rax_read(vcpu);
 788         vmcb12->save.dr7    = vmcb->save.dr7;
 789         vmcb12->save.dr6    = svm->vcpu.arch.dr6;
 790         vmcb12->save.cpl    = vmcb->save.cpl;
 791
 792         vmcb12->control.int_state         = vmcb->control.int_state;
 793         vmcb12->control.exit_code         = vmcb->control.exit_code;
 794         vmcb12->control.exit_code_hi      = vmcb->control.exit_code_hi;
 795         vmcb12->control.exit_info_1       = vmcb->control.exit_info_1;
 796         vmcb12->control.exit_info_2       = vmcb->control.exit_info_2;
 797
 798         if (vmcb12->control.exit_code != SVM_EXIT_ERR)
 799                 nested_save_pending_event_to_vmcb12(svm, vmcb12);
 800
 801         if (svm->nrips_enabled)
 802                 vmcb12->control.next_rip  = vmcb->control.next_rip;
 803
 804         vmcb12->control.int_ctl           = svm->nested.ctl.int_ctl;
 805         vmcb12->control.tlb_ctl           = svm->nested.ctl.tlb_ctl;
 806         vmcb12->control.event_inj         = svm->nested.ctl.event_inj;
 807         vmcb12->control.event_inj_err     = svm->nested.ctl.event_inj_err;
 808
 809         vmcb12->control.pause_filter_count =
 810                 svm->vmcb->control.pause_filter_count;
 811         vmcb12->control.pause_filter_thresh =
 812                 svm->vmcb->control.pause_filter_thresh;
 813
 814         nested_svm_copy_common_state(svm->nested.vmcb02.ptr, svm->vmcb01.ptr);
 815
 816         svm_switch_vmcb(svm, &svm->vmcb01);
 817
 818         /*
 819          * On vmexit the  GIF is set to false and
 820          * no event can be injected in L1.
 821          */
 822         svm_set_gif(svm, false);
 823         svm->vmcb->control.exit_int_info = 0;
 824
 825         svm->vcpu.arch.tsc_offset = svm->vcpu.arch.l1_tsc_offset;
 826         if (svm->vmcb->control.tsc_offset != svm->vcpu.arch.tsc_offset) {
 827                 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset;
 828                 vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 829         }
 830
 831         svm->nested.ctl.nested_cr3 = 0;
 832
 833         /*
 834          * Restore processor state that had been saved in vmcb01
 835          */
 836         kvm_set_rflags(vcpu, svm->vmcb->save.rflags);
 837         svm_set_efer(vcpu, svm->vmcb->save.efer);
 838         svm_set_cr0(vcpu, svm->vmcb->save.cr0 | X86_CR0_PE);
 839         svm_set_cr4(vcpu, svm->vmcb->save.cr4);
 840         kvm_rax_write(vcpu, svm->vmcb->save.rax);
 841         kvm_rsp_write(vcpu, svm->vmcb->save.rsp);
 842         kvm_rip_write(vcpu, svm->vmcb->save.rip);
 843
 844         svm->vcpu.arch.dr7 = DR7_FIXED_1;
 845         kvm_update_dr7(&svm->vcpu);
 846
 847         trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code,
 848                                        vmcb12->control.exit_info_1,
 849                                        vmcb12->control.exit_info_2,
 850                                        vmcb12->control.exit_int_info,
 851                                        vmcb12->control.exit_int_info_err,
 852                                        KVM_ISA_SVM);
 853
 854         kvm_vcpu_unmap(vcpu, &map, true);
 855
 856         nested_svm_transition_tlb_flush(vcpu);
 857
 858         nested_svm_uninit_mmu_context(vcpu);
 859
 860         rc = nested_svm_load_cr3(vcpu, svm->vmcb->save.cr3, false, true);
 861         if (rc)
 862                 return 1;
 863
 864         /*
 865          * Drop what we picked up for L2 via svm_complete_interrupts() so it
 866          * doesn't end up in L1.
 867          */
 868         svm->vcpu.arch.nmi_injected = false;
 869         kvm_clear_exception_queue(vcpu);
 870         kvm_clear_interrupt_queue(vcpu);
 871
 872         /*
 873          * If we are here following the completion of a VMRUN that
 874          * is being single-stepped, queue the pending #DB intercept
 875          * right now so that it an be accounted for before we execute
 876          * L1's next instruction.
 877          */
 878         if (unlikely(svm->vmcb->save.rflags & X86_EFLAGS_TF))
 879                 kvm_queue_exception(&(svm->vcpu), DB_VECTOR);
 880
 881         return 0;
 882 }
 883
 884 static void nested_svm_triple_fault(struct kvm_vcpu *vcpu)
 885 {
 886         nested_svm_simple_vmexit(to_svm(vcpu), SVM_EXIT_SHUTDOWN);
 887 }
 888
 889 int svm_allocate_nested(struct vcpu_svm *svm)
 890 {
 891         struct page *vmcb02_page;
 892
 893         if (svm->nested.initialized)
 894                 return 0;
 895
 896         vmcb02_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
 897         if (!vmcb02_page)
 898                 return -ENOMEM;
 899         svm->nested.vmcb02.ptr = page_address(vmcb02_page);
 900         svm->nested.vmcb02.pa = __sme_set(page_to_pfn(vmcb02_page) << PAGE_SHIFT);
 901
 902         svm->nested.msrpm = svm_vcpu_alloc_msrpm();
 903         if (!svm->nested.msrpm)
 904                 goto err_free_vmcb02;
 905         svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm);
 906
 907         svm->nested.initialized = true;
 908         return 0;
 909
 910 err_free_vmcb02:
 911         __free_page(vmcb02_page);
 912         return -ENOMEM;
 913 }
 914
 915 void svm_free_nested(struct vcpu_svm *svm)
 916 {
 917         if (!svm->nested.initialized)
 918                 return;
 919
 920         svm_vcpu_free_msrpm(svm->nested.msrpm);
 921         svm->nested.msrpm = NULL;
 922
 923         __free_page(virt_to_page(svm->nested.vmcb02.ptr));
 924         svm->nested.vmcb02.ptr = NULL;
 925
 926         /*
 927          * When last_vmcb12_gpa matches the current vmcb12 gpa,
 928          * some vmcb12 fields are not loaded if they are marked clean
 929          * in the vmcb12, since in this case they are up to date already.
 930          *
 931          * When the vmcb02 is freed, this optimization becomes invalid.
 932          */
 933         svm->nested.last_vmcb12_gpa = INVALID_GPA;
 934
 935         svm->nested.initialized = false;
 936 }
 937
 938 /*
 939  * Forcibly leave nested mode in order to be able to reset the VCPU later on.
 940  */
 941 void svm_leave_nested(struct vcpu_svm *svm)
 942 {
 943         struct kvm_vcpu *vcpu = &svm->vcpu;
 944
 945         if (is_guest_mode(vcpu)) {
 946                 svm->nested.nested_run_pending = 0;
 947                 svm->nested.vmcb12_gpa = INVALID_GPA;
 948
 949                 leave_guest_mode(vcpu);
 950
 951                 svm_switch_vmcb(svm, &svm->vmcb01);
 952
 953                 nested_svm_uninit_mmu_context(vcpu);
 954                 vmcb_mark_all_dirty(svm->vmcb);
 955         }
 956
 957         kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
 958 }
 959
 960 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
 961 {
 962         u32 offset, msr, value;
 963         int write, mask;
 964
 965         if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
 966                 return NESTED_EXIT_HOST;
 967
 968         msr    = svm->vcpu.arch.regs[VCPU_REGS_RCX];
 969         offset = svm_msrpm_offset(msr);
 970         write  = svm->vmcb->control.exit_info_1 & 1;
 971         mask   = 1 << ((2 * (msr & 0xf)) + write);
 972
 973         if (offset == MSR_INVALID)
 974                 return NESTED_EXIT_DONE;
 975
 976         /* Offset is in 32 bit units but need in 8 bit units */
 977         offset *= 4;
 978
 979         if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4))
 980                 return NESTED_EXIT_DONE;
 981
 982         return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
 983 }
 984
 985 static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
 986 {
 987         unsigned port, size, iopm_len;
 988         u16 val, mask;
 989         u8 start_bit;
 990         u64 gpa;
 991
 992         if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT)))
 993                 return NESTED_EXIT_HOST;
 994
 995         port = svm->vmcb->control.exit_info_1 >> 16;
 996         size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
 997                 SVM_IOIO_SIZE_SHIFT;
 998         gpa  = svm->nested.ctl.iopm_base_pa + (port / 8);
 999         start_bit = port % 8;
1000         iopm_len = (start_bit + size > 8) ? 2 : 1;
1001         mask = (0xf >> (4 - size)) << start_bit;
1002         val = 0;
1003
1004         if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
1005                 return NESTED_EXIT_DONE;
1006
1007         return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
1008 }
1009
1010 static int nested_svm_intercept(struct vcpu_svm *svm)
1011 {
1012         u32 exit_code = svm->vmcb->control.exit_code;
1013         int vmexit = NESTED_EXIT_HOST;
1014
1015         switch (exit_code) {
1016         case SVM_EXIT_MSR:
1017                 vmexit = nested_svm_exit_handled_msr(svm);
1018                 break;
1019         case SVM_EXIT_IOIO:
1020                 vmexit = nested_svm_intercept_ioio(svm);
1021                 break;
1022         case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
1023                 if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
1024                         vmexit = NESTED_EXIT_DONE;
1025                 break;
1026         }
1027         case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
1028                 if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
1029                         vmexit = NESTED_EXIT_DONE;
1030                 break;
1031         }
1032         case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
1033                 /*
1034                  * Host-intercepted exceptions have been checked already in
1035                  * nested_svm_exit_special.  There is nothing to do here,
1036                  * the vmexit is injected by svm_check_nested_events.
1037                  */
1038                 vmexit = NESTED_EXIT_DONE;
1039                 break;
1040         }
1041         case SVM_EXIT_ERR: {
1042                 vmexit = NESTED_EXIT_DONE;
1043                 break;
1044         }
1045         default: {
1046                 if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
1047                         vmexit = NESTED_EXIT_DONE;
1048         }
1049         }
1050
1051         return vmexit;
1052 }
1053
1054 int nested_svm_exit_handled(struct vcpu_svm *svm)
1055 {
1056         int vmexit;
1057
1058         vmexit = nested_svm_intercept(svm);
1059
1060         if (vmexit == NESTED_EXIT_DONE)
1061                 nested_svm_vmexit(svm);
1062
1063         return vmexit;
1064 }
1065
1066 int nested_svm_check_permissions(struct kvm_vcpu *vcpu)
1067 {
1068         if (!(vcpu->arch.efer & EFER_SVME) || !is_paging(vcpu)) {
1069                 kvm_queue_exception(vcpu, UD_VECTOR);
1070                 return 1;
1071         }
1072
1073         if (to_svm(vcpu)->vmcb->save.cpl) {
1074                 kvm_inject_gp(vcpu, 0);
1075                 return 1;
1076         }
1077
1078         return 0;
1079 }
1080
1081 static bool nested_exit_on_exception(struct vcpu_svm *svm)
1082 {
1083         unsigned int nr = svm->vcpu.arch.exception.nr;
1084
1085         return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr));
1086 }
1087
1088 static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm)
1089 {
1090         unsigned int nr = svm->vcpu.arch.exception.nr;
1091
1092         svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
1093         svm->vmcb->control.exit_code_hi = 0;
1094
1095         if (svm->vcpu.arch.exception.has_error_code)
1096                 svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code;
1097
1098         /*
1099          * EXITINFO2 is undefined for all exception intercepts other
1100          * than #PF.
1101          */
1102         if (nr == PF_VECTOR) {
1103                 if (svm->vcpu.arch.exception.nested_apf)
1104                         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
1105                 else if (svm->vcpu.arch.exception.has_payload)
1106                         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload;
1107                 else
1108                         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
1109         } else if (nr == DB_VECTOR) {
1110                 /* See inject_pending_event.  */
1111                 kvm_deliver_exception_payload(&svm->vcpu);
1112                 if (svm->vcpu.arch.dr7 & DR7_GD) {
1113                         svm->vcpu.arch.dr7 &= ~DR7_GD;
1114                         kvm_update_dr7(&svm->vcpu);
1115                 }
1116         } else
1117                 WARN_ON(svm->vcpu.arch.exception.has_payload);
1118
1119         nested_svm_vmexit(svm);
1120 }
1121
1122 static inline bool nested_exit_on_init(struct vcpu_svm *svm)
1123 {
1124         return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT);
1125 }
1126
1127 static int svm_check_nested_events(struct kvm_vcpu *vcpu)
1128 {
1129         struct vcpu_svm *svm = to_svm(vcpu);
1130         bool block_nested_events =
1131                 kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending;
1132         struct kvm_lapic *apic = vcpu->arch.apic;
1133
1134         if (lapic_in_kernel(vcpu) &&
1135             test_bit(KVM_APIC_INIT, &apic->pending_events)) {
1136                 if (block_nested_events)
1137                         return -EBUSY;
1138                 if (!nested_exit_on_init(svm))
1139                         return 0;
1140                 nested_svm_simple_vmexit(svm, SVM_EXIT_INIT);
1141                 return 0;
1142         }
1143
1144         if (vcpu->arch.exception.pending) {
1145                 /*
1146                  * Only a pending nested run can block a pending exception.
1147                  * Otherwise an injected NMI/interrupt should either be
1148                  * lost or delivered to the nested hypervisor in the EXITINTINFO
1149                  * vmcb field, while delivering the pending exception.
1150                  */
1151                 if (svm->nested.nested_run_pending)
1152                         return -EBUSY;
1153                 if (!nested_exit_on_exception(svm))
1154                         return 0;
1155                 nested_svm_inject_exception_vmexit(svm);
1156                 return 0;
1157         }
1158
1159         if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) {
1160                 if (block_nested_events)
1161                         return -EBUSY;
1162                 if (!nested_exit_on_smi(svm))
1163                         return 0;
1164                 nested_svm_simple_vmexit(svm, SVM_EXIT_SMI);
1165                 return 0;
1166         }
1167
1168         if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) {
1169                 if (block_nested_events)
1170                         return -EBUSY;
1171                 if (!nested_exit_on_nmi(svm))
1172                         return 0;
1173                 nested_svm_simple_vmexit(svm, SVM_EXIT_NMI);
1174                 return 0;
1175         }
1176
1177         if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) {
1178                 if (block_nested_events)
1179                         return -EBUSY;
1180                 if (!nested_exit_on_intr(svm))
1181                         return 0;
1182                 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
1183                 nested_svm_simple_vmexit(svm, SVM_EXIT_INTR);
1184                 return 0;
1185         }
1186
1187         return 0;
1188 }
1189
1190 int nested_svm_exit_special(struct vcpu_svm *svm)
1191 {
1192         u32 exit_code = svm->vmcb->control.exit_code;
1193
1194         switch (exit_code) {
1195         case SVM_EXIT_INTR:
1196         case SVM_EXIT_NMI:
1197         case SVM_EXIT_NPF:
1198                 return NESTED_EXIT_HOST;
1199         case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
1200                 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
1201
1202                 if (svm->vmcb01.ptr->control.intercepts[INTERCEPT_EXCEPTION] &
1203                     excp_bits)
1204                         return NESTED_EXIT_HOST;
1205                 else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR &&
1206                          svm->vcpu.arch.apf.host_apf_flags)
1207                         /* Trap async PF even if not shadowing */
1208                         return NESTED_EXIT_HOST;
1209                 break;
1210         }
1211         default:
1212                 break;
1213         }
1214
1215         return NESTED_EXIT_CONTINUE;
1216 }
1217
1218 static int svm_get_nested_state(struct kvm_vcpu *vcpu,
1219                                 struct kvm_nested_state __user *user_kvm_nested_state,
1220                                 u32 user_data_size)
1221 {
1222         struct vcpu_svm *svm;
1223         struct kvm_nested_state kvm_state = {
1224                 .flags = 0,
1225                 .format = KVM_STATE_NESTED_FORMAT_SVM,
1226                 .size = sizeof(kvm_state),
1227         };
1228         struct vmcb __user *user_vmcb = (struct vmcb __user *)
1229                 &user_kvm_nested_state->data.svm[0];
1230
1231         if (!vcpu)
1232                 return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE;
1233
1234         svm = to_svm(vcpu);
1235
1236         if (user_data_size < kvm_state.size)
1237                 goto out;
1238
1239         /* First fill in the header and copy it out.  */
1240         if (is_guest_mode(vcpu)) {
1241                 kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa;
1242                 kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE;
1243                 kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
1244
1245                 if (svm->nested.nested_run_pending)
1246                         kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING;
1247         }
1248
1249         if (gif_set(svm))
1250                 kvm_state.flags |= KVM_STATE_NESTED_GIF_SET;
1251
1252         if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state)))
1253                 return -EFAULT;
1254
1255         if (!is_guest_mode(vcpu))
1256                 goto out;
1257
1258         /*
1259          * Copy over the full size of the VMCB rather than just the size
1260          * of the structs.
1261          */
1262         if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE))
1263                 return -EFAULT;
1264         if (copy_to_user(&user_vmcb->control, &svm->nested.ctl,
1265                          sizeof(user_vmcb->control)))
1266                 return -EFAULT;
1267         if (copy_to_user(&user_vmcb->save, &svm->vmcb01.ptr->save,
1268                          sizeof(user_vmcb->save)))
1269                 return -EFAULT;
1270 out:
1271         return kvm_state.size;
1272 }
1273
1274 static int svm_set_nested_state(struct kvm_vcpu *vcpu,
1275                                 struct kvm_nested_state __user *user_kvm_nested_state,
1276                                 struct kvm_nested_state *kvm_state)
1277 {
1278         struct vcpu_svm *svm = to_svm(vcpu);
1279         struct vmcb __user *user_vmcb = (struct vmcb __user *)
1280                 &user_kvm_nested_state->data.svm[0];
1281         struct vmcb_control_area *ctl;
1282         struct vmcb_save_area *save;
1283         unsigned long cr0;
1284         int ret;
1285
1286         BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) >
1287                      KVM_STATE_NESTED_SVM_VMCB_SIZE);
1288
1289         if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM)
1290                 return -EINVAL;
1291
1292         if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE |
1293                                  KVM_STATE_NESTED_RUN_PENDING |
1294                                  KVM_STATE_NESTED_GIF_SET))
1295                 return -EINVAL;
1296
1297         /*
1298          * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's
1299          * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed.
1300          */
1301         if (!(vcpu->arch.efer & EFER_SVME)) {
1302                 /* GIF=1 and no guest mode are required if SVME=0.  */
1303                 if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET)
1304                         return -EINVAL;
1305         }
1306
1307         /* SMM temporarily disables SVM, so we cannot be in guest mode.  */
1308         if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
1309                 return -EINVAL;
1310
1311         if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) {
1312                 svm_leave_nested(svm);
1313                 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET));
1314                 return 0;
1315         }
1316
1317         if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa))
1318                 return -EINVAL;
1319         if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE)
1320                 return -EINVAL;
1321
1322         ret  = -ENOMEM;
1323         ctl  = kzalloc(sizeof(*ctl),  GFP_KERNEL_ACCOUNT);
1324         save = kzalloc(sizeof(*save), GFP_KERNEL_ACCOUNT);
1325         if (!ctl || !save)
1326                 goto out_free;
1327
1328         ret = -EFAULT;
1329         if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl)))
1330                 goto out_free;
1331         if (copy_from_user(save, &user_vmcb->save, sizeof(*save)))
1332                 goto out_free;
1333
1334         ret = -EINVAL;
1335         if (!nested_vmcb_check_controls(vcpu, ctl))
1336                 goto out_free;
1337
1338         /*
1339          * Processor state contains L2 state.  Check that it is
1340          * valid for guest mode (see nested_vmcb_check_save).
1341          */
1342         cr0 = kvm_read_cr0(vcpu);
1343         if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW))
1344                 goto out_free;
1345
1346         /*
1347          * Validate host state saved from before VMRUN (see
1348          * nested_svm_check_permissions).
1349          */
1350         if (!(save->cr0 & X86_CR0_PG) ||
1351             !(save->cr0 & X86_CR0_PE) ||
1352             (save->rflags & X86_EFLAGS_VM) ||
1353             !nested_vmcb_valid_sregs(vcpu, save))
1354                 goto out_free;
1355
1356         /*
1357          * While the nested guest CR3 is already checked and set by
1358          * KVM_SET_SREGS, it was set when nested state was yet loaded,
1359          * thus MMU might not be initialized correctly.
1360          * Set it again to fix this.
1361          */
1362
1363         ret = nested_svm_load_cr3(&svm->vcpu, vcpu->arch.cr3,
1364                                   nested_npt_enabled(svm), false);
1365         if (WARN_ON_ONCE(ret))
1366                 goto out_free;
1367
1368
1369         /*
1370          * All checks done, we can enter guest mode. Userspace provides
1371          * vmcb12.control, which will be combined with L1 and stored into
1372          * vmcb02, and the L1 save state which we store in vmcb01.
1373          * L2 registers if needed are moved from the current VMCB to VMCB02.
1374          */
1375
1376         if (is_guest_mode(vcpu))
1377                 svm_leave_nested(svm);
1378         else
1379                 svm->nested.vmcb02.ptr->save = svm->vmcb01.ptr->save;
1380
1381         svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET));
1382
1383         svm->nested.nested_run_pending =
1384                 !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING);
1385
1386         svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa;
1387
1388         svm_copy_vmrun_state(&svm->vmcb01.ptr->save, save);
1389         nested_load_control_from_vmcb12(svm, ctl);
1390
1391         svm_switch_vmcb(svm, &svm->nested.vmcb02);
1392         nested_vmcb02_prepare_control(svm);
1393         kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
1394         ret = 0;
1395 out_free:
1396         kfree(save);
1397         kfree(ctl);
1398
1399         return ret;
1400 }
1401
1402 static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu)
1403 {
1404         struct vcpu_svm *svm = to_svm(vcpu);
1405
1406         if (WARN_ON(!is_guest_mode(vcpu)))
1407                 return true;
1408
1409         if (!vcpu->arch.pdptrs_from_userspace &&
1410             !nested_npt_enabled(svm) && is_pae_paging(vcpu))
1411                 /*
1412                  * Reload the guest's PDPTRs since after a migration
1413                  * the guest CR3 might be restored prior to setting the nested
1414                  * state which can lead to a load of wrong PDPTRs.
1415                  */
1416                 if (CC(!load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3)))
1417                         return false;
1418
1419         if (!nested_svm_vmrun_msrpm(svm)) {
1420                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1421                 vcpu->run->internal.suberror =
1422                         KVM_INTERNAL_ERROR_EMULATION;
1423                 vcpu->run->internal.ndata = 0;
1424                 return false;
1425         }
1426
1427         return true;
1428 }
1429
1430 struct kvm_x86_nested_ops svm_nested_ops = {
1431         .check_events = svm_check_nested_events,
1432         .triple_fault = nested_svm_triple_fault,
1433         .get_nested_state_pages = svm_get_nested_state_pages,
1434         .get_state = svm_get_nested_state,
1435         .set_state = svm_set_nested_state,
1436 };