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KVM: VMX: Only save/restore MSR_K6_STAR if necessary
authorAvi Kivity <avi@qumranet.com>
Thu, 19 Apr 2007 11:28:44 +0000 (14:28 +0300)
committerAvi Kivity <avi@qumranet.com>
Thu, 3 May 2007 07:52:30 +0000 (10:52 +0300)
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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