arm64: hyp-stub: Zero x0 on successful stub handling
We now return HVC_STUB_ERR when a stub hypercall fails, but we
leave whatever was in x0 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>
diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S
index 3734e63..839425c 100644
--- a/arch/arm64/kvm/hyp-init.S
+++ b/arch/arm64/kvm/hyp-init.S
@@ -154,13 +154,13 @@
/* Install stub vectors */
adr_l x5, __hyp_stub_vectors
msr vbar_el2, x5
- b exit
+ mov x0, xzr
+ eret
1: /* Bad stub call */
ldr x0, =HVC_STUB_ERR
-
-exit:
eret
+
ENDPROC(__kvm_handle_stub_hvc)
.ltorg