KVM: VMX: Only reload guest cr2 if different from host cr2

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cr2 changes only rarely, and writing it is expensive.  Avoid the costly cr2
writes by checking if it does not already hold the desired value.

Shaves 70 cycles off the vmexit latency.

Signed-off-by: Avi Kivity <avi@redhat.com>

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This commit is contained in:

Avi Kivity 2009-06-16 12:33:56 +03:00

parent 681405bfc7

commit d3edefc003

1 changed files with 7 additions and 2 deletions

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arch/x86/kvm/vmx.c

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