Patchwork [1/4] KVM: PPC: BookE: Allow irq deliveries to inject requests

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Submitter Alexander Graf
Date Jan. 4, 2013, 11:41 p.m.
Message ID <1357342903-11585-2-git-send-email-agraf@suse.de>
Download mbox | patch
Permalink /patch/209577/
State New
Headers show

Comments

Alexander Graf - Jan. 4, 2013, 11:41 p.m.
From: Mihai Caraman <mihai.caraman@freescale.com>

When injecting an interrupt into guest context, we usually don't need
to check for requests anymore. At least not until today.

With the introduction of EPR, we will have to create a request when the
guest has successfully accepted an external interrupt though.

So we need to prepare the interrupt delivery to abort guest entry
gracefully. Otherwise we'd delay the EPR request.

Signed-off-by: Alexander Graf <agraf@suse.de>

---

v1 -> v2:

  - do an explicit requests check rather than play with return values
---
 arch/powerpc/kvm/booke.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 69f1140..964f447 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -581,6 +581,11 @@  int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
 
 	kvmppc_core_check_exceptions(vcpu);
 
+	if (vcpu->requests) {
+		/* Exception delivery raised request; start over */
+		return 1;
+	}
+
 	if (vcpu->arch.shared->msr & MSR_WE) {
 		local_irq_enable();
 		kvm_vcpu_block(vcpu);