From: Marc Zyngier Date: Mon, 3 Apr 2017 18:38:06 +0000 (+0100) Subject: ARM: hyp-stub: Zero r0 on successful stub handling X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d9118c87d21ee799058a55eeae84d392ae887c91;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Christoffer Dall --- diff --git a/arch/arm/kernel/hyp-stub.S b/arch/arm/kernel/hyp-stub.S index 918c64f17128..d8523cc47a54 100644 --- a/arch/arm/kernel/hyp-stub.S +++ b/arch/arm/kernel/hyp-stub.S @@ -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) diff --git a/arch/arm/kvm/init.S b/arch/arm/kvm/init.S index 87bcd7ae4552..570ed4a9c261 100644 --- a/arch/arm/kvm/init.S +++ b/arch/arm/kvm/init.S @@ -155,8 +155,10 @@ reset: b exit 1: ldr r0, =HVC_STUB_ERR + eret exit: + mov r0, #0 eret ENDPROC(__kvm_handle_stub_hvc)