From: Davidlohr Bueso <dave@gnu.org>
To: Avi Kivity <avi@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>
Cc: KVM <kvm@vger.kernel.org>, lkml <linux-kernel@vger.kernel.org>
Subject: [PATCH v2] KVM: x86: add paging gcc optimization
Date: Thu, 08 Mar 2012 12:45:54 +0100 [thread overview]
Message-ID: <1331207154.28711.2.camel@offworld> (raw)
From: Davidlohr Bueso <dave@gnu.org>
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>
---
arch/x86/kvm/x86.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index cb80c29..3d1134d 100644
--- 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)
--
1.7.8.3
next reply other threads:[~2012-03-08 10:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-08 11:45 Davidlohr Bueso [this message]
2012-03-08 15:47 ` [PATCH v2] KVM: x86: add paging gcc optimization Christian Borntraeger
2012-03-08 21:27 ` Davidlohr Bueso
2012-03-12 12:12 ` Avi Kivity
2012-03-23 21:51 ` Davidlohr Bueso
2012-03-28 16:36 ` Avi Kivity
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