virtio: find_vqs/del_vqs virtio operations

This replaces find_vq/del_vq with find_vqs/del_vqs virtio operations,
and updates all drivers. This is needed for MSI support, because MSI
needs to know the total number of vectors upfront.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (+ lguest/9p compile fixes)

1 files changed, 11 insertions, 16 deletions

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 0fa73b4d18b..26b27826479 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -204,6 +204,9 @@ static int balloon(void *_vballoon)
 static int virtballoon_probe(struct virtio_device *vdev)
 {
         struct virtio_balloon *vb;
+        struct virtqueue *vqs[2];
+        vq_callback_t *callbacks[] = { balloon_ack, balloon_ack };
+        const char *names[] = { "inflate", "deflate" };
         int err;
 
         vdev->priv = vb = kmalloc(sizeof(*vb), GFP_KERNEL);
@@ -218,22 +221,17 @@ static int virtballoon_probe(struct virtio_device *vdev)
         vb->vdev = vdev;
 
         /* We expect two virtqueues. */
-        vb->inflate_vq = vdev->config->find_vq(vdev, 0, balloon_ack, "inflate");
-        if (IS_ERR(vb->inflate_vq)) {
-                err = PTR_ERR(vb->inflate_vq);
+        err = vdev->config->find_vqs(vdev, 2, vqs, callbacks, names);
+        if (err)
                 goto out_free_vb;
-        }
 
-        vb->deflate_vq = vdev->config->find_vq(vdev, 1, balloon_ack, "deflate");
-        if (IS_ERR(vb->deflate_vq)) {
-                err = PTR_ERR(vb->deflate_vq);
-                goto out_del_inflate_vq;
-        }
+        vb->inflate_vq = vqs[0];
+        vb->deflate_vq = vqs[1];
 
         vb->thread = kthread_run(balloon, vb, "vballoon");
         if (IS_ERR(vb->thread)) {
                 err = PTR_ERR(vb->thread);
-                goto out_del_deflate_vq;
+                goto out_del_vqs;
         }
 
         vb->tell_host_first
@@ -241,10 +239,8 @@ static int virtballoon_probe(struct virtio_device *vdev)
 
         return 0;
 
-out_del_deflate_vq:
-        vdev->config->del_vq(vb->deflate_vq);
-out_del_inflate_vq:
-        vdev->config->del_vq(vb->inflate_vq);
+out_del_vqs:
+        vdev->config->del_vqs(vdev);
 out_free_vb:
         kfree(vb);
 out:
@@ -264,8 +260,7 @@ static void virtballoon_remove(struct virtio_device *vdev)
         /* Now we reset the device so we can clean up the queues. */
         vdev->config->reset(vdev);
 
-        vdev->config->del_vq(vb->deflate_vq);
-        vdev->config->del_vq(vb->inflate_vq);
+        vdev->config->del_vqs(vdev);
         kfree(vb);
 }