Commit edc2ae84 authored by Avi Kivity's avatar Avi Kivity

KVM: MMU: Optimize gpte_access() slightly

If nx is disabled, then is gpte[63] is set we will hit a reserved
bit set fault before checking permissions; so we can ignore the
setting of efer.nxe.
Reviewed-by: default avatarXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 8ea667f2
...@@ -106,10 +106,8 @@ static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte) ...@@ -106,10 +106,8 @@ static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte)
unsigned access; unsigned access;
access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK; access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK;
#if PTTYPE == 64 #if PTTYPE == 64
if (vcpu->arch.mmu.nx) access &= ~(gpte >> PT64_NX_SHIFT);
access &= ~(gpte >> PT64_NX_SHIFT);
#endif #endif
return access; return access;
} }
......
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