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| author | Stefano Garzarella <sgarzare@redhat.com> | 2022-04-28 15:22:41 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-05-02 16:04:34 -0700 |
| commit | bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c (patch) | |
| tree | 3247afa5dcf219a903cd770f6b6e3bcf6fd6685d /net/vmw_vsock | |
| parent | a103209886264a3289f7e53e7ed389d0391fb23f (diff) | |
| download | linux-bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c.tar.gz | |
vsock/virtio: add support for device suspend/resume
Implement .freeze and .restore callbacks of struct virtio_driver to support device suspend/resume. During suspension all connected sockets are reset and VQs deleted. During resume the VQs are re-initialized. Reported by: Vilas R K <vilas.r.k@intel.com> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/vmw_vsock')
| -rw-r--r-- | net/vmw_vsock/virtio_transport.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index 31f4f6f40614..ad64f403536a 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -743,6 +743,49 @@ static void virtio_vsock_remove(struct virtio_device *vdev) kfree(vsock); } +#ifdef CONFIG_PM_SLEEP +static int virtio_vsock_freeze(struct virtio_device *vdev) +{ + struct virtio_vsock *vsock = vdev->priv; + + mutex_lock(&the_virtio_vsock_mutex); + + rcu_assign_pointer(the_virtio_vsock, NULL); + synchronize_rcu(); + + virtio_vsock_vqs_del(vsock); + + mutex_unlock(&the_virtio_vsock_mutex); + + return 0; +} + +static int virtio_vsock_restore(struct virtio_device *vdev) +{ + struct virtio_vsock *vsock = vdev->priv; + int ret; + + mutex_lock(&the_virtio_vsock_mutex); + + /* Only one virtio-vsock device per guest is supported */ + if (rcu_dereference_protected(the_virtio_vsock, + lockdep_is_held(&the_virtio_vsock_mutex))) { + ret = -EBUSY; + goto out; + } + + ret = virtio_vsock_vqs_init(vsock); + if (ret < 0) + goto out; + + rcu_assign_pointer(the_virtio_vsock, vsock); + +out: + mutex_unlock(&the_virtio_vsock_mutex); + return ret; +} +#endif /* CONFIG_PM_SLEEP */ + static struct virtio_device_id id_table[] = { { VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID }, { 0 }, @@ -760,6 +803,10 @@ static struct virtio_driver virtio_vsock_driver = { .id_table = id_table, .probe = virtio_vsock_probe, .remove = virtio_vsock_remove, +#ifdef CONFIG_PM_SLEEP + .freeze = virtio_vsock_freeze, + .restore = virtio_vsock_restore, +#endif }; static int __init virtio_vsock_init(void) |