tools/testing/selftests/kvm/x86_64/vmx_msrs_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VMX control MSR test
   4  *
   5  * Copyright (C) 2022 Google LLC.
   6  *
   7  * Tests for KVM ownership of bits in the VMX entry/exit control MSRs. Checks
   8  * that KVM will set owned bits where appropriate, and will not if
   9  * KVM_X86_QUIRK_TWEAK_VMX_CTRL_MSRS is disabled.
  10  */
  11 #include <linux/bitmap.h>
  12 #include "kvm_util.h"
  13 #include "vmx.h"
  14
  15 static void vmx_fixed1_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index,
  16                                   uint64_t mask)
  17 {
  18         uint64_t val = vcpu_get_msr(vcpu, msr_index);
  19         uint64_t bit;
  20
  21         mask &= val;
  22
  23         for_each_set_bit(bit, &mask, 64) {
  24                 vcpu_set_msr(vcpu, msr_index, val & ~BIT_ULL(bit));
  25                 vcpu_set_msr(vcpu, msr_index, val);
  26         }
  27 }
  28
  29 static void vmx_fixed0_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index,
  30                                 uint64_t mask)
  31 {
  32         uint64_t val = vcpu_get_msr(vcpu, msr_index);
  33         uint64_t bit;
  34
  35         mask = ~mask | val;
  36
  37         for_each_clear_bit(bit, &mask, 64) {
  38                 vcpu_set_msr(vcpu, msr_index, val | BIT_ULL(bit));
  39                 vcpu_set_msr(vcpu, msr_index, val);
  40         }
  41 }
  42
  43 static void vmx_fixed0and1_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index)
  44 {
  45         vmx_fixed0_msr_test(vcpu, msr_index, GENMASK_ULL(31, 0));
  46         vmx_fixed1_msr_test(vcpu, msr_index, GENMASK_ULL(63, 32));
  47 }
  48
  49 static void vmx_save_restore_msrs_test(struct kvm_vcpu *vcpu)
  50 {
  51         vcpu_set_msr(vcpu, MSR_IA32_VMX_VMCS_ENUM, 0);
  52         vcpu_set_msr(vcpu, MSR_IA32_VMX_VMCS_ENUM, -1ull);
  53
  54         vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_BASIC,
  55                             BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55));
  56
  57         vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_MISC,
  58                             BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) |
  59                             BIT_ULL(15) | BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30));
  60
  61         vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_PROCBASED_CTLS2);
  62         vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_EPT_VPID_CAP, -1ull);
  63         vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_PINBASED_CTLS);
  64         vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_PROCBASED_CTLS);
  65         vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_EXIT_CTLS);
  66         vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_ENTRY_CTLS);
  67         vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_VMFUNC, -1ull);
  68 }
  69
  70 int main(void)
  71 {
  72         struct kvm_vcpu *vcpu;
  73         struct kvm_vm *vm;
  74
  75         TEST_REQUIRE(kvm_has_cap(KVM_CAP_DISABLE_QUIRKS2));
  76         TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));
  77
  78         /* No need to actually do KVM_RUN, thus no guest code. */
  79         vm = vm_create_with_one_vcpu(&vcpu, NULL);
  80
  81         vmx_save_restore_msrs_test(vcpu);
  82
  83         kvm_vm_free(vm);
  84 }