tree e61e3a6714d4fd06dbddb3d381494e505fd91ff0
parent c9047f533373e934b96d19d6a3d313ca2132fbe5
author Avi Kivity <avi@qumranet.com> 1176813024 +0300
committer Avi Kivity <avi@qumranet.com> 1178178749 +0300

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>