[PATCH 10/18] KVM: x86/mmu: Set shadow_accessed_mask for EPT even if A/D bits disabled

Sean Christopherson
2024-10-11T02:11:13Z

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
acros NUMA balancing, if something like that is ever desirable.

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

diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c
index c9543625dda2..e352d1821319 100644
--- a/arch/x86/kvm/mmu/spte.c
+++ b/arch/x86/kvm/mmu/spte.c
@@ -419,7 +419,7 @@ 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;
--
2.47.0.rc1.288.g06298d1525-goog