[PATCH 07/19] arm64: KVM: Allow an exit code to be tagged with an SError

Marc Zyngier
2016-09-06T13:02:36Z

Similarily to EL1, an asynchronous abort can be triggered whilst
running at EL2. But instead of making that a new error code,
we need to communicate it to the rest of KVM together with
the exit reason. So let's hijack a single bit that allows the
exception code to be tagged with a "pending SError" information.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm64/include/asm/kvm_asm.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index d177e7e..18f7465 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -20,6 +20,10 @@

#include <asm/virt.h>

+#define ARM_EXIT_WITH_SERROR_BIT 31
+#define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
+#define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
+
#define ARM_EXCEPTION_IRQ 0
#define ARM_EXCEPTION_EL1_SERROR 1
#define ARM_EXCEPTION_TRAP 2
--
2.1.4