KVM: PPC: Implement alignment interrupt

Mac OS X has some applications - namely the Finder - that require alignment
interrupts to work properly. So we need to implement them.

But the spec for 970 and 750 also looks different. While 750 requires the
DSISR and DAR fields to reflect some instruction bits (DSISR) and the fault
address (DAR), the 970 declares this as an optional feature. So we need
to reconstruct DSISR and DAR manually.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index c058f1a5c095..de12202fe1c6 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -906,6 +906,16 @@ program_interrupt:
                 }
                 break;
         }
+        case BOOK3S_INTERRUPT_ALIGNMENT:
+                if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
+                        to_book3s(vcpu)->dsisr = kvmppc_alignment_dsisr(vcpu,
+                                vcpu->arch.last_inst);
+                        vcpu->arch.dear = kvmppc_alignment_dar(vcpu,
+                                vcpu->arch.last_inst);
+                        kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
+                }
+                r = RESUME_GUEST;
+                break;
         case BOOK3S_INTERRUPT_MACHINE_CHECK:
         case BOOK3S_INTERRUPT_TRACE:
                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);