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KVM: x86/mmu: Pivot on "TDP MMU enabled" when handling direct page faults

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When handling direct page faults, pivot on the TDP MMU being globally
enabled instead of checking if the target MMU is a TDP MMU.  Now that the
TDP MMU is all-or-nothing, if the TDP MMU is enabled, KVM will reach
direct_page_fault() if and only if the MMU is a TDP MMU.  When TDP is
enabled (obviously required for the TDP MMU), only non-nested TDP page
faults reach direct_page_fault(), i.e. nonpaging MMUs are impossible, as
NPT requires paging to be enabled and EPT faults use ept_page_fault().

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221012181702.3663607-8-seanjc@google.com>
[Use tdp_mmu_enabled variable. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-10-12 18:16:58 +00:00 committed by Paolo Bonzini
parent f2e4535c27
commit 94fbbfbbdf
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mmu/mmu.c
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@ -3372,7 +3372,7 @@ static int fast_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
do {
u64 new_spte;
if (is_tdp_mmu(vcpu->arch.mmu))
if (tdp_mmu_enabled)
sptep = kvm_tdp_mmu_fast_pf_get_last_sptep(vcpu, fault->addr, &spte);
else
sptep = fast_pf_get_last_sptep(vcpu, fault->addr, &spte);