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KVM: x86/mmu: WARN and skip MMIO cache on private, reserved page faults

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WARN and skip the emulated MMIO fastpath if a private, reserved page fault
is encountered, as private+reserved should be an impossible combination
(KVM should never create an MMIO SPTE for a private access).

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20240228024147.41573-9-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2024-02-27 18:41:39 -08:00
committed by Paolo Bonzini
parent cd389f5070
commit 07702e5a6d
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/mmu/mmu.c
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@@ -5818,6 +5818,9 @@ int noinline kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 err
r = RET_PF_INVALID;
if (unlikely(error_code & PFERR_RSVD_MASK)) {
if (WARN_ON_ONCE(error_code & PFERR_PRIVATE_ACCESS))
return -EFAULT;
r = handle_mmio_page_fault(vcpu, cr2_or_gpa, direct);
if (r == RET_PF_EMULATE)
goto emulate;