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 <[email protected]> --- arch/arm/kernel/hyp-stub.S | 2 ++ arch/arm/kvm/init.S | 2 ++ 2 files changed, 4 insertions(+) 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) -- 2.11.0 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
