diff mbox series

[RFC,2/9] KVM: x86/mmu: Set shadow_accessed_mask for EPT even if A/D bits disabled

Message ID 20240801183453.57199-3-seanjc@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86/mmu: Preserve Accessed bits on PROT changes | expand

Commit Message

Sean Christopherson Aug. 1, 2024, 6:34 p.m. UTC 
Now that KVM doesn't use shadow_accessed_mask to detect if hardware A/D
bits are enabled, set shadow_accessed_mask for EPT even when A/D bits
are disabled in hardware.  This will allow using shadow_accessed_mask for
software purposes, e.g. to preserve accessed status in a non-present SPTE.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/mmu/spte.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c
index b713a6542eeb..cae45825617c 100644
--- a/arch/x86/kvm/mmu/spte.c
+++ b/arch/x86/kvm/mmu/spte.c
@@ -440,7 +440,7 @@  void kvm_mmu_set_ept_masks(bool has_ad_bits, bool has_exec_only)
 	kvm_ad_enabled		= has_ad_bits;
 
 	shadow_user_mask	= VMX_EPT_READABLE_MASK;
-	shadow_accessed_mask	= has_ad_bits ? VMX_EPT_ACCESS_BIT : 0ull;
+	shadow_accessed_mask	= VMX_EPT_ACCESS_BIT;
 	shadow_dirty_mask	= has_ad_bits ? VMX_EPT_DIRTY_BIT : 0ull;
 	shadow_nx_mask		= 0ull;
 	shadow_x_mask		= VMX_EPT_EXECUTABLE_MASK;