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| author | Avi Kivity <avi@redhat.com> | 2012-09-12 13:53:08 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-09-20 13:00:07 +0300 |
| commit | edc2ae84eb40a3c062210fe01af1cae1633cc810 (patch) | |
| tree | 2e286495eef839146cb720429dae0cc98aa968bf | |
| parent | 8ea667f259e3767fd3ee85a885c14e417835695e (diff) | |
| download | op-kernel-dev-edc2ae84eb40a3c062210fe01af1cae1633cc810.zip op-kernel-dev-edc2ae84eb40a3c062210fe01af1cae1633cc810.tar.gz | |
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: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index bf7b4ff..064bcb3 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -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; } |
