From 90bba358873dc96a6746f0df453a0a8ca3d6b86e Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Thu, 29 Jul 2010 14:47:51 +0200 Subject: KVM: PPC: Tell guest about pending interrupts When the guest turns on interrupts again, it needs to know if we have an interrupt pending for it. Because if so, it should rather get out of guest context and get the interrupt. So we introduce a new field in the shared page that we use to tell the guest that there's a pending interrupt lying around. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s.c | 7 +++++++ arch/powerpc/kvm/booke.c | 7 +++++++ 2 files changed, 14 insertions(+) (limited to 'arch/powerpc/kvm') diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index d6227ff0cea..06229fec5c9 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -337,6 +337,7 @@ int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority) void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu) { unsigned long *pending = &vcpu->arch.pending_exceptions; + unsigned long old_pending = vcpu->arch.pending_exceptions; unsigned int priority; #ifdef EXIT_DEBUG @@ -356,6 +357,12 @@ void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu) BITS_PER_BYTE * sizeof(*pending), priority + 1); } + + /* Tell the guest about our interrupt status */ + if (*pending) + vcpu->arch.shared->int_pending = 1; + else if (old_pending) + vcpu->arch.shared->int_pending = 0; } void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr) diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 104d0ee8c8a..c604277011a 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -224,6 +224,7 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu) { unsigned long *pending = &vcpu->arch.pending_exceptions; + unsigned long old_pending = vcpu->arch.pending_exceptions; unsigned int priority; priority = __ffs(*pending); @@ -235,6 +236,12 @@ void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu) BITS_PER_BYTE * sizeof(*pending), priority + 1); } + + /* Tell the guest about our interrupt status */ + if (*pending) + vcpu->arch.shared->int_pending = 1; + else if (old_pending) + vcpu->arch.shared->int_pending = 0; } /** -- cgit v1.2.3