KVM, pkeys: introduce pkru_mask to cache conditions
PKEYS defines a new status bit in the PFEC. PFEC.PK (bit 5), if some
conditions is true, the fault is considered as a PKU violation.
pkru_mask indicates if we need to check PKRU.ADi and PKRU.WDi, and
does cache some conditions for permission_fault.
[ Huaitong: Xiao helps to modify many sections. ]
Signed-off-by: Huaitong Han <huaitong.han@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 01c8b50..8968165 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -335,6 +335,14 @@
*/
u8 permissions[16];
+ /*
+ * The pkru_mask indicates if protection key checks are needed. It
+ * consists of 16 domains indexed by page fault error code bits [4:1],
+ * with PFEC.RSVD replaced by ACC_USER_MASK from the page tables.
+ * Each domain has 2 bits which are ANDed with AD and WD from PKRU.
+ */
+ u32 pkru_mask;
+
u64 *pae_root;
u64 *lm_root;