Messages in this thread Patch in this message | | | Date | Tue, 27 Feb 2024 18:41:42 -0800 | Subject | [PATCH 11/16] KVM: x86/mmu: Explicitly disallow private accesses to emulated MMIO | From | Sean Christopherson <> |
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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> --- arch/x86/kvm/mmu/mmu.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 5c8caab64ba2..ebdb3fcce3dc 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3314,6 +3314,11 @@ 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); -- 2.44.0.278.ge034bb2e1d-goog
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