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KVM: x86/mmu: Explicitly disallow private accesses to emulated MMIO

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Explicitly detect and disallow private accesses to emulated MMIO in
kvm_handle_noslot_fault() instead of relying on kvm_faultin_pfn_private()
to perform the check.  This will allow the page fault path to go straight
to kvm_handle_noslot_fault() without bouncing through __kvm_faultin_pfn().

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20240228024147.41573-12-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2024-02-27 18:41:42 -08:00 committed by Paolo Bonzini
parent 5bd74f6eec
commit bde9f9d27e
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kvm/mmu/mmu.c
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@ -3261,6 +3261,11 @@ static int kvm_handle_noslot_fault(struct kvm_vcpu *vcpu,
{
gva_t gva = fault->is_tdp ? 0 : fault->addr;
if (fault->is_private) {
kvm_mmu_prepare_memory_fault_exit(vcpu, fault);
return -EFAULT;
}
vcpu_cache_mmio_info(vcpu, gva, fault->gfn,
access & shadow_mmio_access_mask);