From 07dc7263b99e4ddad2b4c69765a428ccb7d48938 Mon Sep 17 00:00:00 2001
From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Wed, 2 Jun 2010 11:26:26 -0300
Subject: [PATCH] KVM: read apic->irr with ioapic lock held
Read ioapic->irr inside ioapic->lock protected section.
KVM-Stable-Tag
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
virt/kvm/ioapic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 7c79c1d76d0c..3500dee9cf2b 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -192,12 +192,13 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
{
- u32 old_irr = ioapic->irr;
+ u32 old_irr;
u32 mask = 1 << irq;
union kvm_ioapic_redirect_entry entry;
int ret = 1;
spin_lock(&ioapic->lock);
+ old_irr = ioapic->irr;
if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
entry = ioapic->redirtbl[irq];
level ^= entry.fields.polarity;
--
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