Commit bde9f9d2 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
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KVM: x86/mmu: Explicitly disallow private accesses to emulated MMIO 



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: default avatarSean Christopherson <seanjc@google.com>
Message-ID: <20240228024147.41573-12-seanjc@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 5bd74f6e

arch/x86/kvm/mmu/mmu.c

+5 −0
Original line number Diff line number Diff line
@@ -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);