linux-kernel - [KVM PATCH v2 3/3] kvm: do not register i8254 PIO regions until we are initialized

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Message-ID: <20090527213749.24324.18640.stgit@dev.haskins.net>
Date:	Wed, 27 May 2009 17:37:50 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	avi@...hat.com
Cc:	chrisw@...s-sol.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [KVM PATCH v2 3/3] kvm: do not register i8254 PIO regions until we
	are initialized

We currently publish the i8254 resources to the pio_bus before the devices
are fully initialized.  Since we hold the pit_lock, its probably not
a real issue.  But lets clean this up anyway.

Found-by: Avi Kivity <avi@...hat.com>
Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 arch/x86/kvm/i8254.c |   17 ++++++++---------
 1 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index d6a2b7d..0667700 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -601,15 +601,6 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
 	mutex_lock(&pit->pit_state.lock);
 	spin_lock_init(&pit->pit_state.inject_lock);
 
-	/* Initialize PIO device */
-	kvm_iodevice_init(&pit->dev, &pit_dev_ops);
-	kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev);
-
-	if (flags & KVM_PIT_SPEAKER_DUMMY) {
-		kvm_iodevice_init(&pit->speaker_dev, &speaker_dev_ops);
-		kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev);
-	}
-
 	kvm->arch.vpit = pit;
 	pit->kvm = kvm;
 
@@ -628,6 +619,14 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
 	pit->mask_notifier.func = pit_mask_notifer;
 	kvm_register_irq_mask_notifier(kvm, 0, &pit->mask_notifier);
 
+	kvm_iodevice_init(&pit->dev, &pit_dev_ops);
+	kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev);
+
+	if (flags & KVM_PIT_SPEAKER_DUMMY) {
+		kvm_iodevice_init(&pit->speaker_dev, &speaker_dev_ops);
+		kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev);
+	}
+
 	return pit;
 }
 

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