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authorAmit Shah <amit.shah@redhat.com>2008-09-16 18:04:28 +0300
committerAvi Kivity <avi@redhat.com>2008-10-15 14:25:04 +0200
commitbfadaded0dc323a1cf3f08b5068f12955b54cbaa (patch)
tree8b55582d859efa274be0c7cfc92c9da00324fddf
parent62c476c7c7f25a5b245b9902a935636e6316e58c (diff)
downloadlinux-2.6.34-ux500-bfadaded0dc323a1cf3f08b5068f12955b54cbaa.tar.gz
KVM: Device Assignment: Free device structures if IRQ allocation fails
When an IRQ allocation fails, we free up the device structures and disable the device so that we can unregister the device in the userspace and not expose it to the guest at all. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
-rw-r--r--arch/x86/kvm/x86.c86
1 files changed, 45 insertions, 41 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c8a2793626e..61eddbeabeb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -166,6 +166,43 @@ static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
enable_irq(dev->host_irq);
}
+static void kvm_free_assigned_device(struct kvm *kvm,
+ struct kvm_assigned_dev_kernel
+ *assigned_dev)
+{
+ if (irqchip_in_kernel(kvm) && assigned_dev->irq_requested)
+ free_irq(assigned_dev->host_irq, (void *)assigned_dev);
+
+ kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
+
+ if (cancel_work_sync(&assigned_dev->interrupt_work))
+ /* We had pending work. That means we will have to take
+ * care of kvm_put_kvm.
+ */
+ kvm_put_kvm(kvm);
+
+ pci_release_regions(assigned_dev->dev);
+ pci_disable_device(assigned_dev->dev);
+ pci_dev_put(assigned_dev->dev);
+
+ list_del(&assigned_dev->list);
+ kfree(assigned_dev);
+}
+
+static void kvm_free_all_assigned_devices(struct kvm *kvm)
+{
+ struct list_head *ptr, *ptr2;
+ struct kvm_assigned_dev_kernel *assigned_dev;
+
+ list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
+ assigned_dev = list_entry(ptr,
+ struct kvm_assigned_dev_kernel,
+ list);
+
+ kvm_free_assigned_device(kvm, assigned_dev);
+ }
+}
+
static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
struct kvm_assigned_irq
*assigned_irq)
@@ -194,8 +231,8 @@ static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
if (irqchip_in_kernel(kvm)) {
if (!capable(CAP_SYS_RAWIO)) {
- return -EPERM;
- goto out;
+ r = -EPERM;
+ goto out_release;
}
if (assigned_irq->host_irq)
@@ -214,17 +251,18 @@ static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
*/
if (request_irq(match->host_irq, kvm_assigned_dev_intr, 0,
"kvm_assigned_device", (void *)match)) {
- printk(KERN_INFO "%s: couldn't allocate irq for pv "
- "device\n", __func__);
r = -EIO;
- goto out;
+ goto out_release;
}
}
match->irq_requested = true;
-out:
mutex_unlock(&kvm->lock);
return r;
+out_release:
+ mutex_unlock(&kvm->lock);
+ kvm_free_assigned_device(kvm, match);
+ return r;
}
static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
@@ -300,40 +338,6 @@ out_free:
return r;
}
-static void kvm_free_assigned_devices(struct kvm *kvm)
-{
- struct list_head *ptr, *ptr2;
- struct kvm_assigned_dev_kernel *assigned_dev;
-
- list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
- assigned_dev = list_entry(ptr,
- struct kvm_assigned_dev_kernel,
- list);
-
- if (irqchip_in_kernel(kvm) && assigned_dev->irq_requested) {
- free_irq(assigned_dev->host_irq,
- (void *)assigned_dev);
-
- kvm_unregister_irq_ack_notifier(kvm,
- &assigned_dev->
- ack_notifier);
- }
-
- if (cancel_work_sync(&assigned_dev->interrupt_work))
- /* We had pending work. That means we will have to take
- * care of kvm_put_kvm.
- */
- kvm_put_kvm(kvm);
-
- pci_release_regions(assigned_dev->dev);
- pci_disable_device(assigned_dev->dev);
- pci_dev_put(assigned_dev->dev);
-
- list_del(&assigned_dev->list);
- kfree(assigned_dev);
- }
-}
-
unsigned long segment_base(u16 selector)
{
struct descriptor_table gdt;
@@ -4296,7 +4300,7 @@ static void kvm_free_vcpus(struct kvm *kvm)
void kvm_arch_destroy_vm(struct kvm *kvm)
{
kvm_iommu_unmap_guest(kvm);
- kvm_free_assigned_devices(kvm);
+ kvm_free_all_assigned_devices(kvm);
kvm_free_pit(kvm);
kfree(kvm->arch.vpic);
kfree(kvm->arch.vioapic);