KVM: x86: add paging gcc optimization

Since most guests will have paging enabled for memory management, add likely() optimization
around CR0.PG checks.

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index cb80c293cdd8ea1b26dbbaa050c1c5c43b1fd1ab..3d1134ddb885622af79bdb0fefb589c8f7b4d5b6 100644 (file)
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -64,7 +64,7 @@ static inline int is_pse(struct kvm_vcpu *vcpu)
 
 static inline int is_paging(struct kvm_vcpu *vcpu)
 {
-       return kvm_read_cr0_bits(vcpu, X86_CR0_PG);
+       return likely(kvm_read_cr0_bits(vcpu, X86_CR0_PG));
 }
 
 static inline u32 bit(int bitno)