KVM: VMX: Reduce unnecessary saving of host msrs

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THe automatically switched msrs are never changed on the host (with
the exception of MSR_KERNEL_GS_BASE) and thus there is no need to save
them on every vm entry.

This reduces vmexit latency by ~400 cycles on i386 and by ~900 cycles (10%)
on x86_64.

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

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This commit is contained in:

Avi Kivity 2007-04-17 15:30:24 +03:00

parent c9047f5333

commit 2345df8c55

1 changed files with 11 additions and 1 deletions

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12

drivers/kvm/vmx.c

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