[PATCH 2/6] KVM: PPC: Book3S HV P9: Inject pending xive interrupts at guest entry

[Nicholas Piggin]

If there is a pending xive interrupt, inject it at guest entry (if
MSR[EE] is enabled) rather than take another interrupt when the guest
is entered. If xive is enabled then LPCR[LPES] is set so this behaviour
should be expected.

Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
 arch/powerpc/kvm/book3s_hv.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index f8c0f1f52a1e..5df359053147 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4524,9 +4524,14 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 
time_limit,
 
        if (!nested) {
                kvmppc_core_prepare_to_enter(vcpu);
-               if (test_bit(BOOK3S_IRQPRIO_EXTERNAL,
-                            &vcpu->arch.pending_exceptions))
+               if (vcpu->arch.shregs.msr & MSR_EE) {
+                       if (xive_interrupt_pending(vcpu))
+                               kvmppc_inject_interrupt_hv(vcpu,
+                                               BOOK3S_INTERRUPT_EXTERNAL, 0);
+               } else if (test_bit(BOOK3S_IRQPRIO_EXTERNAL,
+                            &vcpu->arch.pending_exceptions)) {
                        lpcr |= LPCR_MER;
+               }
        } else if (vcpu->arch.pending_exceptions ||
                   vcpu->arch.doorbell_request ||
                   xive_interrupt_pending(vcpu)) {
-- 
2.23.0