Re: [PATCH 14/16] KVM: x86/mmu: Set kvm_page_fault.hva to KVM_HVA_ERR_BAD for "no slot" faults

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On 28/02/2024 3:41 pm, Sean Christopherson wrote:
Explicitly set fault->hva to KVM_HVA_ERR_BAD when handling a "no slot"
fault to ensure that KVM doesn't use a bogus virtual address, e.g. if
there *was* a slot but it's unusable (APIC access page), or if there
really was no slot, in which case fault->hva will be '0' (which is a
legal address for x86).

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
  arch/x86/kvm/mmu/mmu.c | 1 +
  1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 4dee0999a66e..43f24a74571a 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3325,6 +3325,7 @@ static int kvm_handle_noslot_fault(struct kvm_vcpu *vcpu,
  	fault->slot = NULL;
  	fault->pfn = KVM_PFN_NOSLOT;
  	fault->map_writable = false;
+	fault->hva = KVM_HVA_ERR_BAD;
/*
  	 * If MMIO caching is disabled, emulate immediately without

Not sure why this cannot be merged to the previous one?

Anyway,

Reviewed-by: Kai Huang <kai.huang@xxxxxxxxx>




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