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authorAlexander Graf <agraf@suse.de>2009-12-21 20:21:24 +0100
committerMarcelo Tosatti <mtosatti@redhat.com>2010-03-01 12:35:42 -0300
commit7706664d39a8eb8555408a24b1f17bd2086189c6 (patch)
treec71bde99ac96573e137c29f990e0af4c1854b4df /arch/powerpc/kvm/emulate.c
parent583617b7866cfcc0b3830a4b7ab20f218d180f67 (diff)
KVM: powerpc: Improve DEC handling
We treated the DEC interrupt like an edge based one. This is not true for Book3s. The DEC keeps firing until mtdec is issued again and thus clears the interrupt line. So let's implement this logic in KVM too. This patch moves the line clearing from the firing of the interrupt to the mtdec emulation. This makes PPC64 guests work without AGGRESSIVE_DEC defined. Signed-off-by: Alexander Graf <agraf@suse.de> Acked-by: Acked-by: Hollis Blanchard <hollis@penguinppc.org> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/kvm/emulate.c')
-rw-r--r--arch/powerpc/kvm/emulate.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 4a9ac6640fa..303457b2f52 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -83,6 +83,9 @@ void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
pr_debug("mtDEC: %x\n", vcpu->arch.dec);
#ifdef CONFIG_PPC64
+ /* mtdec lowers the interrupt line when positive. */
+ kvmppc_core_dequeue_dec(vcpu);
+
/* POWER4+ triggers a dec interrupt if the value is < 0 */
if (vcpu->arch.dec & 0x80000000) {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);