From: Marcelo Tosatti <mtosatti@redhat.com>
To: kvm <kvm@vger.kernel.org>
Cc: Gleb Natapov <gleb@redhat.com>
Subject: KVM: read apic->irr with ioapic lock held
Date: Wed, 2 Jun 2010 11:26:26 -0300 [thread overview]
Message-ID: <20100602142626.GA23058@amt.cnet> (raw)
Read ioapic->irr inside ioapic->lock protected section.
KVM-Stable-Tag
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 3bc4fdb..1149c60 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -193,12 +193,13 @@ 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;
next reply other threads:[~2010-06-02 14:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-02 14:26 Marcelo Tosatti [this message]
2010-06-02 15:12 ` KVM: read apic->irr with ioapic lock held Avi Kivity
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