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KVM: MMU: Optimize gpte_access() slightly

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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: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2012-09-12 13:53:08 +03:00
parent 8ea667f259
commit edc2ae84eb
1 changed files with 1 additions and 3 deletions
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4
arch/x86/kvm/paging_tmpl.h
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@ -106,10 +106,8 @@ static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte)
unsigned access;
access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK;
#if PTTYPE == 64
if (vcpu->arch.mmu.nx)
access &= ~(gpte >> PT64_NX_SHIFT);
access &= ~(gpte >> PT64_NX_SHIFT);
#endif
return access;
}