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virtio: Protect vqs list access

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[ Upstream commit 0e566c8f0f2e8325e35f6f97e13cde5356b41814 ]

VQs may be accessed to mark the device broken while they are
created/destroyed. Hence protect the access to the vqs list.

Fixes: e2dcdfe95c ("virtio: virtio_break_device() to mark all virtqueues broken.")
Signed-off-by: Parav Pandit <parav@nvidia.com>
Link: https://lore.kernel.org/r/20210721142648.1525924-4-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Parav Pandit
2021-07-21 17:26:47 +03:00
committed by Sasha Levin
parent 9108120fbe
commit 293180f593
3 changed files with 10 additions and 0 deletions
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1
drivers/virtio/virtio.c
View File

@@ -357,6 +357,7 @@ int register_virtio_device(struct virtio_device *dev)
virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE); virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
INIT_LIST_HEAD(&dev->vqs); INIT_LIST_HEAD(&dev->vqs);
spin_lock_init(&dev->vqs_list_lock);
/* /*
* device_add() causes the bus infrastructure to look for a matching * device_add() causes the bus infrastructure to look for a matching

8
drivers/virtio/virtio_ring.c
View File

@@ -1668,7 +1668,9 @@ static struct virtqueue *vring_create_virtqueue_packed(
cpu_to_le16(vq->packed.event_flags_shadow); cpu_to_le16(vq->packed.event_flags_shadow);
} }
spin_lock(&vdev->vqs_list_lock);
list_add_tail(&vq->vq.list, &vdev->vqs); list_add_tail(&vq->vq.list, &vdev->vqs);
spin_unlock(&vdev->vqs_list_lock);
return &vq->vq; return &vq->vq;
err_desc_extra: err_desc_extra:
@@ -2126,7 +2128,9 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
memset(vq->split.desc_state, 0, vring.num * memset(vq->split.desc_state, 0, vring.num *
sizeof(struct vring_desc_state_split)); sizeof(struct vring_desc_state_split));
spin_lock(&vdev->vqs_list_lock);
list_add_tail(&vq->vq.list, &vdev->vqs); list_add_tail(&vq->vq.list, &vdev->vqs);
spin_unlock(&vdev->vqs_list_lock);
return &vq->vq; return &vq->vq;
} }
EXPORT_SYMBOL_GPL(__vring_new_virtqueue); EXPORT_SYMBOL_GPL(__vring_new_virtqueue);
@@ -2210,7 +2214,9 @@ void vring_del_virtqueue(struct virtqueue *_vq)
} }
if (!vq->packed_ring) if (!vq->packed_ring)
kfree(vq->split.desc_state); kfree(vq->split.desc_state);
spin_lock(&vq->vq.vdev->vqs_list_lock);
list_del(&_vq->list); list_del(&_vq->list);
spin_unlock(&vq->vq.vdev->vqs_list_lock);
kfree(vq); kfree(vq);
} }
EXPORT_SYMBOL_GPL(vring_del_virtqueue); EXPORT_SYMBOL_GPL(vring_del_virtqueue);
@@ -2274,10 +2280,12 @@ void virtio_break_device(struct virtio_device *dev)
{ {
struct virtqueue *_vq; struct virtqueue *_vq;
spin_lock(&dev->vqs_list_lock);
list_for_each_entry(_vq, &dev->vqs, list) { list_for_each_entry(_vq, &dev->vqs, list) {
struct vring_virtqueue *vq = to_vvq(_vq); struct vring_virtqueue *vq = to_vvq(_vq);
vq->broken = true; vq->broken = true;
} }
spin_unlock(&dev->vqs_list_lock);
} }
EXPORT_SYMBOL_GPL(virtio_break_device); EXPORT_SYMBOL_GPL(virtio_break_device);

1
include/linux/virtio.h
View File

@@ -110,6 +110,7 @@ struct virtio_device {
bool config_enabled; bool config_enabled;
bool config_change_pending; bool config_change_pending;
spinlock_t config_lock; spinlock_t config_lock;
spinlock_t vqs_list_lock; /* Protects VQs list access */
struct device dev; struct device dev;
struct virtio_device_id id; struct virtio_device_id id;
const struct virtio_config_ops *config; const struct virtio_config_ops *config;