arm: KVM: Allow an exit code to be tagged with a Virtual Abort

An asynchronous abort can also 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 Abort" information.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/arch/arm/include/asm/kvm_asm.h b/arch/arm/include/asm/kvm_asm.h
index 58faff5..05e47fa 100644 (file)
--- a/arch/arm/include/asm/kvm_asm.h
+++ b/arch/arm/include/asm/kvm_asm.h
@@ -21,6 +21,10 @@
 
 #include <asm/virt.h>
 
+#define ARM_EXIT_WITH_ABORT_BIT  31
+#define ARM_EXCEPTION_CODE(x)    ((x) & ~(1U << ARM_EXIT_WITH_ABORT_BIT))
+#define ARM_ABORT_PENDING(x)     !!((x) & (1U << ARM_EXIT_WITH_ABORT_BIT))
+
 #define ARM_EXCEPTION_RESET      0
 #define ARM_EXCEPTION_UNDEFINED   1
 #define ARM_EXCEPTION_SOFTWARE    2