[PATCH] arm64: KVM: Save two instructions in __guest_enter()

Hi Shanker,

On Tue, Aug 09, 2016 at 08:15:36PM -0500, Shanker Donthineni wrote:

We are doing an unnecessary stack push/pop operation when restoring
the guest registers x0-x18 in __guest_enter(). This patch saves the
two instructions by using x18 as a base register. No need to store
the vcpu context pointer in stack because it is redundant and not
being used anywhere, the same information is available in tpidr_el2.

Does this have any measureable benefit?

Thanks,
-Christoffer