diff options
| -rw-r--r-- | arch/x86/kvm/mmu/spte.h | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/x86/kvm/mmu/spte.h b/arch/x86/kvm/mmu/spte.h index 4283cea3e66c..317b9cd1537c 100644 --- a/arch/x86/kvm/mmu/spte.h +++ b/arch/x86/kvm/mmu/spte.h @@ -18,9 +18,19 @@ #define SPTE_MMU_PRESENT_MASK BIT_ULL(11) /* + * The ignored high bits are allocated as follows: + * - bits 52, 54: saved X-R bits for access tracking when EPT does not have A/D + * - bits 53 (EPT only): host writable + * - bits 55 (EPT only): MMU-writable + * - bits 56-59: unused + * - bits 60-61: type of A/D tracking + * - bits 62: unused + */ + +/* * TDP SPTES (more specifically, EPT SPTEs) may not have A/D bits, and may also * be restricted to using write-protection (for L2 when CPU dirty logging, i.e. - * PML, is enabled). Use bits 52 and 53 to hold the type of A/D tracking that + * PML, is enabled). Use bits 60 and 61 to hold the type of A/D tracking that * is must be employed for a given TDP SPTE. * * Note, the "enabled" mask must be '0', as bits 62:52 are _reserved_ for PAE @@ -29,7 +39,7 @@ * TDP with CPU dirty logging (PML). If NPT ever gains PML-like support, it * must be restricted to 64-bit KVM. */ -#define SPTE_TDP_AD_SHIFT 52 +#define SPTE_TDP_AD_SHIFT 60 #define SPTE_TDP_AD_MASK (3ULL << SPTE_TDP_AD_SHIFT) #define SPTE_TDP_AD_ENABLED (0ULL << SPTE_TDP_AD_SHIFT) #define SPTE_TDP_AD_DISABLED (1ULL << SPTE_TDP_AD_SHIFT) @@ -65,7 +75,7 @@ static_assert(SPTE_TDP_AD_ENABLED == 0); */ #define SHADOW_ACC_TRACK_SAVED_BITS_MASK (SPTE_EPT_READABLE_MASK | \ SPTE_EPT_EXECUTABLE_MASK) -#define SHADOW_ACC_TRACK_SAVED_BITS_SHIFT 54 +#define SHADOW_ACC_TRACK_SAVED_BITS_SHIFT 52 #define SHADOW_ACC_TRACK_SAVED_MASK (SHADOW_ACC_TRACK_SAVED_BITS_MASK << \ SHADOW_ACC_TRACK_SAVED_BITS_SHIFT) static_assert(!(SPTE_TDP_AD_MASK & SHADOW_ACC_TRACK_SAVED_MASK)); @@ -84,8 +94,8 @@ static_assert(!(SPTE_TDP_AD_MASK & SHADOW_ACC_TRACK_SAVED_MASK)); * to not overlap the A/D type mask or the saved access bits of access-tracked * SPTEs when A/D bits are disabled. */ -#define EPT_SPTE_HOST_WRITABLE BIT_ULL(57) -#define EPT_SPTE_MMU_WRITABLE BIT_ULL(58) +#define EPT_SPTE_HOST_WRITABLE BIT_ULL(53) +#define EPT_SPTE_MMU_WRITABLE BIT_ULL(55) static_assert(!(EPT_SPTE_HOST_WRITABLE & SPTE_TDP_AD_MASK)); static_assert(!(EPT_SPTE_MMU_WRITABLE & SPTE_TDP_AD_MASK)); |