There's nothing to switch if the host and guest values are the same. I am unable to find evidence that this makes any difference whatsoever. Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx> --- arch/x86/kvm/vmx.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index e72b9660e51c..c430b01b012b 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1670,7 +1670,9 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset) guest_efer = vmx->vcpu.arch.efer; if (!(guest_efer & EFER_LMA)) guest_efer &= ~EFER_LME; - add_atomic_switch_msr(vmx, MSR_EFER, guest_efer, host_efer); + if (guest_efer != host_efer) + add_atomic_switch_msr(vmx, MSR_EFER, + guest_efer, host_efer); return false; } -- 1.9.3 -- 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
