linux-kernel - [PATCH 3/3] KVM: Fix mmu reset locking when setting cr0

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Message-Id: <20061120102920.B555325015E@cleopatra.q>
Date:	Mon, 20 Nov 2006 10:29:20 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	akpm@...l.org, kvm-devel@...ts.sourceforge.net,
	yaniv.kamay@...ranet.com, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] KVM: Fix mmu reset locking when setting cr0

From: Yaniv Kamay <yaniv@...ranet.com>

An mmu reset needs to be called with the kvm lock held.

Signed-off-by: Yaniv Kamay <yaniv@...ranet.com>
Signed-off-by: Avi Kivity <avi@...ranet.com>

Index: linux-2.6/drivers/kvm/kvm_main.c
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm_main.c
+++ linux-2.6/drivers/kvm/kvm_main.c
@@ -1045,7 +1045,9 @@ static void set_cr0(struct kvm_vcpu *vcp
 	}
 
 	__set_cr0(vcpu, cr0);
+	spin_lock(&vcpu->kvm->lock);
 	kvm_mmu_reset_context(vcpu);
+	spin_unlock(&vcpu->kvm->lock);
 	return;
 }
 
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