tree 8b16dd35e100af2feec42306348896a6ef198a50
parent 3427318fd2244737a466a06a93c5fe579852f871
author Avi Kivity <avi@qumranet.com> 1188348485 +0300
committer Avi Kivity <avi@qumranet.com> 1201708367 +0200

KVM: VMX: Further reduce efer reloads

KVM avoids reloading the efer msr when the difference between the guest
and host values consist of the long mode bits (which are switched by
hardware) and the NX bit (which is emulated by the KVM MMU).

This patch also allows KVM to ignore SCE (syscall enable) when the guest
is running in 32-bit mode.  This is because the syscall instruction is
not available in 32-bit mode on Intel processors, so the SCE bit is
effectively meaningless.

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