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KVM: x86/mmu: Use MMU's role to get EFER.NX during MMU configuration

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Get the MMU's effective EFER.NX from its role instead of using the
one-off, dedicated flag.  This will allow dropping said flag in a
future commit.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622175739.3610207-38-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-06-22 10:57:22 -07:00 committed by Paolo Bonzini
parent 84a1622604
commit 90599c2801
1 changed files with 4 additions and 3 deletions
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7
arch/x86/kvm/mmu/mmu.c
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@ -4212,7 +4212,7 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
{
__reset_rsvds_bits_mask(&context->guest_rsvd_check,
vcpu->arch.reserved_gpa_bits,
context->root_level, context->nx,
context->root_level, is_efer_nx(context),
guest_cpuid_has(vcpu, X86_FEATURE_GBPAGES),
is_cr4_pse(context),
guest_cpuid_is_amd_or_hygon(vcpu));
@ -4278,7 +4278,7 @@ static void reset_shadow_zero_bits_mask(struct kvm_vcpu *vcpu,
* NX can be used by any non-nested shadow MMU to avoid having to reset
* MMU contexts. Note, KVM forces EFER.NX=1 when TDP is disabled.
*/
bool uses_nx = context->nx || !tdp_enabled;
bool uses_nx = is_efer_nx(context) || !tdp_enabled;
/* @amd adds a check on bit of SPTEs, which KVM shouldn't use anyways. */
bool is_amd = true;
@ -4375,6 +4375,7 @@ static void update_permission_bitmask(struct kvm_mmu *mmu, bool ept)
bool cr4_smep = is_cr4_smep(mmu);
bool cr4_smap = is_cr4_smap(mmu);
bool cr0_wp = is_cr0_wp(mmu);
bool efer_nx = is_efer_nx(mmu);
for (byte = 0; byte < ARRAY_SIZE(mmu->permissions); ++byte) {
unsigned pfec = byte << 1;
@ -4400,7 +4401,7 @@ static void update_permission_bitmask(struct kvm_mmu *mmu, bool ept)
u8 kf = (pfec & PFERR_USER_MASK) ? 0 : u;
/* Not really needed: !nx will cause pte.nx to fault */
if (!mmu->nx)
if (!efer_nx)
ff = 0;
/* Allow supervisor writes if !cr0.wp */