The lightweight exit path needlessly reloads %ds and %es (and clobbers the user supplied values as well, a minor ABI bug). This patchset fixes the bug and moves the reload to the heavyweight exit path (potentially skipping it completely on x86_64), reducing the vmexit cost by about 70 cycles. Avi Kivity (2): KVM: VMX: Fix %ds/%es clobber KVM: VMX: Optimize %ds, %es reload arch/x86/kvm/vmx.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) -- 1.7.10.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
