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ARM: hyp-stub: Zero r0 on successful stub handling 

We now return HVC_STUB_ERR when a stub hypercall fails, but we
leave whatever was in r0 on success. Zeroing it on return seems
like a good idea.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Marc Zyngier 2017-04-03 19:38:06 +01:00 committed by Christoffer Dall
parent af42f20480
commit d9118c87d2
2 changed files with 4 additions and 0 deletions
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2
arch/arm/kernel/hyp-stub.S
View File

@ -215,8 +215,10 @@ __hyp_stub_do_trap:
beq __hyp_stub_exit
ldr r0, =HVC_STUB_ERR
__ERET
__hyp_stub_exit:
mov r0, #0
__ERET
ENDPROC(__hyp_stub_do_trap)

2
arch/arm/kvm/init.S
View File

@ -155,8 +155,10 @@ reset:
b exit
1: ldr r0, =HVC_STUB_ERR
eret
exit:
mov r0, #0
eret
ENDPROC(__kvm_handle_stub_hvc)