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Subject[PATCH] kvm:vmx:code changes in handle_io() to save some CPU cycles.
Date
code changes in handle_io() to save some CPU cycles.

Signed-off-by: Stephen Zhang <starzhangzsd@gmail.com>
---
arch/x86/kvm/vmx/vmx.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 47b8357..109bcf64 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4899,15 +4899,14 @@ static int handle_triple_fault(struct kvm_vcpu *vcpu)
static int handle_io(struct kvm_vcpu *vcpu)
{
unsigned long exit_qualification;
- int size, in, string;
+ int size, in;
unsigned port;

exit_qualification = vmx_get_exit_qual(vcpu);
- string = (exit_qualification & 16) != 0;

++vcpu->stat.io_exits;

- if (string)
+ if (exit_qualification & 16)
return kvm_emulate_instruction(vcpu, 0);

port = exit_qualification >> 16;
--
1.8.3.1
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