KVM: PPC: Make Performance Counters work

When we get a performance counter interrupt we need to route it on to the
Linux handler after we got out of the guest context. We also need to tell
our handling code that this particular interrupt doesn't need treatment.

So let's add those two bits in, making perf work while having a KVM guest
running.

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

2 files changed, 5 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 6ee9c5e1ffe2..f66de7e518f7 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -873,6 +873,9 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
                 vcpu->stat.ext_intr_exits++;
                 r = RESUME_GUEST;
                 break;
+        case BOOK3S_INTERRUPT_PERFMON:
+                r = RESUME_GUEST;
+                break;
         case BOOK3S_INTERRUPT_PROGRAM:
         {
                 enum emulation_result er;
diff --git a/arch/powerpc/kvm/book3s_interrupts.S b/arch/powerpc/kvm/book3s_interrupts.S
index a1b50280dc47..2f0bc928b08a 100644
--- a/arch/powerpc/kvm/book3s_interrupts.S
+++ b/arch/powerpc/kvm/book3s_interrupts.S
@@ -228,6 +228,8 @@ no_dcbz32_off:
         beq     call_linux_handler
         cmpwi   r12, BOOK3S_INTERRUPT_DECREMENTER
         beq     call_linux_handler
+        cmpwi   r12, BOOK3S_INTERRUPT_PERFMON
+        beq     call_linux_handler
 
         /* Back to EE=1 */
         mtmsr   r6