arm: KVM: Inject a Virtual Abort if it was pending

If we have caught an Abort whilst exiting, we've tagged the
exit code with the pending information. In that case, let's
re-inject the error into the guest, after having adjusted
the PC if required.

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

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
index 863fdf42668e..4eacb5cb60e8 100644
--- a/arch/arm/kvm/handle_exit.c
+++ b/arch/arm/kvm/handle_exit.c
@@ -144,6 +144,25 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 {
         exit_handle_fn exit_handler;
 
+        if (ARM_ABORT_PENDING(exception_index)) {
+                u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
+
+                /*
+                 * HVC/SMC already have an adjusted PC, which we need
+                 * to correct in order to return to after having
+                 * injected the abort.
+                 */
+                if (hsr_ec == HSR_EC_HVC || hsr_ec == HSR_EC_SMC) {
+                        u32 adj =  kvm_vcpu_trap_il_is32bit(vcpu) ? 4 : 2;
+                        *vcpu_pc(vcpu) -= adj;
+                }
+
+                kvm_inject_vabt(vcpu);
+                return 1;
+        }
+
+        exception_index = ARM_EXCEPTION_CODE(exception_index);
+
         switch (exception_index) {
         case ARM_EXCEPTION_IRQ:
                 return 1;