KVM: arm64: Improve debug register save/restore flow

Browse source

Instead of having multiple calls from the world switch path to the debug
logic, each figuring out if the dirty bit is set and if we should
save/restore the debug registers, let's just provide two hooks to the
debug save/restore functionality, one for switching to the guest
context, and one for switching to the host context, and we get the
benefit of only having to evaluate the dirty flag once on each path,
plus we give the compiler some more room to inline some of this
functionality.

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>

...

This commit is contained in:

Christoffer Dall 2017-10-10 20:10:08 +02:00 • committed by Marc Zyngier

parent 5742d04912

commit 014c4c77aa

3 changed files with 42 additions and 30 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

10

arch/arm64/include/asm/kvm_hyp.h

View file

56

arch/arm64/kvm/hyp/debug-sr.c

View file

6

arch/arm64/kvm/hyp/switch.c

View file