KVM: VMX: Only save/restore MSR_K6_STAR if necessary

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Intel hosts only support syscall/sysret in long more (and only if efer.sce
is enabled), so only reload the related MSR_K6_STAR if the guest will
actually be able to use it.

This reduces vmexit cost by about 500 cycles (6400 -> 5870) on my setup.

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

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Avi Kivity 2007-04-19 14:28:44 +03:00

parent 35cc7f9711

commit 4d56c8a787

1 changed files with 16 additions and 0 deletions

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drivers/kvm/vmx.c

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