tree 6c541aaddd29ea4b14e0586caadac5aa84e34d5d
parent 54ceb1bcf8d83e835be515d7d9e4129a73d80f4e
author Christoffer Dall <christoffer.dall@linaro.org> 1507658156 +0200
committer Marc Zyngier <marc.zyngier@arm.com> 1521456792 +0000

KVM: arm64: Slightly improve debug save/restore functions

The debug save/restore functions can be improved by using the has_vhe()
static key instead of the instruction alternative.  Using the static key
uses the same paradigm as we're going to use elsewhere, it makes the
code more readable, and it generates slightly better code (no
stack setups and function calls unless necessary).

We also use a static key on the restore path, because it will be
marginally faster than loading a value from memory.

Finally, we don't have to conditionally clear the debug dirty flag if
it's set, we can just clear it.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>