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[RFC,v3,32/59] KVM: x86/mmu: Explicitly check for MMIO spte in fast page fault

Message ID 530d97b430b592207eccf063bfa2fdf7c0b50e4d.1637799475.git.isaku.yamahata@intel.com (mailing list archive)
State New, archived
Headers show
Series KVM: X86: TDX support | expand

Commit Message

Isaku Yamahata Nov. 25, 2021, 12:20 a.m. UTC 
From: Sean Christopherson <sean.j.christopherson@intel.com>

Explicity check for an MMIO spte in the fast page fault flow.  TDX will
use a not-present entry for MMIO sptes, which can be mistaken for an
access-tracked spte since both have SPTE_SPECIAL_MASK set.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
 arch/x86/kvm/mmu/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 5305d1d9a976..01569913f1f0 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3186,7 +3186,7 @@  static int fast_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
 			break;
 
 		sp = sptep_to_sp(sptep);
-		if (!is_last_spte(spte, sp->role.level))
+		if (!is_last_spte(spte, sp->role.level) || is_mmio_spte(spte))
 			break;
 
 		/*