arm64: KVM: Inject a Virtual SError if it was pending
authorMarc Zyngier <marc.zyngier@arm.com>
Tue, 6 Sep 2016 13:02:06 +0000 (14:02 +0100)
committerChristoffer Dall <christoffer.dall@linaro.org>
Thu, 8 Sep 2016 10:53:00 +0000 (12:53 +0200)
If we have caught an SError 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>
arch/arm64/kvm/handle_exit.c

index 08afc69ab1571247bac189a08c542e5f6e2ff50b..a204adf29f0a6dedd1c47485564086ef9682f82b 100644 (file)
@@ -170,6 +170,26 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 {
        exit_handle_fn exit_handler;
 
+       if (ARM_SERROR_PENDING(exception_index)) {
+               u8 hsr_ec = ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
+
+               /*
+                * HVC/SMC already have an adjusted PC, which we need
+                * to correct in order to return to after having
+                * injected the SError.
+                */
+               if (hsr_ec == ESR_ELx_EC_HVC32 || hsr_ec == ESR_ELx_EC_HVC64 ||
+                   hsr_ec == ESR_ELx_EC_SMC32 || hsr_ec == ESR_ELx_EC_SMC64) {
+                       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;