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KVM: VMX: Reduce unnecessary saving of host msrs
authorAvi Kivity <avi@qumranet.com>
Tue, 17 Apr 2007 12:30:24 +0000 (15:30 +0300)
committerAvi Kivity <avi@qumranet.com>
Thu, 3 May 2007 07:52:29 +0000 (10:52 +0300)
commit2345df8c555ecb92c0c36172c07d5ac321a92dc7
treee61e3a6714d4fd06dbddb3d381494e505fd91ff0tree
parentc9047f533373e934b96d19d6a3d313ca2132fbe5commit | diff
KVM: VMX: Reduce unnecessary saving of host msrs

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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