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From b395ad369278d0923a590975fabbb99ec7716c6b Mon Sep 17 00:00:00 2001
From: Julia Suvorova <jusual@redhat.com>
Date: Wed, 19 Feb 2020 21:34:28 +0000
Subject: [PATCH 4/7] virtio: add ability to delete vq through a pointer
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RH-Author: Julia Suvorova <jusual@redhat.com>
Message-id: <20200219213431.11913-2-jusual@redhat.com>
Patchwork-id: 93980
O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH 1/4] virtio: add ability to delete vq through a pointer
Bugzilla: 1791590
RH-Acked-by: Danilo de Paula <ddepaula@redhat.com>
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>

From: "Michael S. Tsirkin" <mst@redhat.com>

Devices tend to maintain vq pointers, allow deleting them trough a vq pointer.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
(cherry picked from commit 722f8c51d8af223751dfb1d02de40043e8ba067e)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 hw/virtio/virtio.c         | 15 ++++++++++-----
 include/hw/virtio/virtio.h |  2 ++
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 3211135..d63a369 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2335,17 +2335,22 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
     return &vdev->vq[i];
 }
 
+void virtio_delete_queue(VirtQueue *vq)
+{
+    vq->vring.num = 0;
+    vq->vring.num_default = 0;
+    vq->handle_output = NULL;
+    vq->handle_aio_output = NULL;
+    g_free(vq->used_elems);
+}
+
 void virtio_del_queue(VirtIODevice *vdev, int n)
 {
     if (n < 0 || n >= VIRTIO_QUEUE_MAX) {
         abort();
     }
 
-    vdev->vq[n].vring.num = 0;
-    vdev->vq[n].vring.num_default = 0;
-    vdev->vq[n].handle_output = NULL;
-    vdev->vq[n].handle_aio_output = NULL;
-    g_free(vdev->vq[n].used_elems);
+    virtio_delete_queue(&vdev->vq[n]);
 }
 
 static void virtio_set_isr(VirtIODevice *vdev, int value)
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 6a20442..91167f6 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -183,6 +183,8 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
 
 void virtio_del_queue(VirtIODevice *vdev, int n);
 
+void virtio_delete_queue(VirtQueue *vq);
+
 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
                     unsigned int len);
 void virtqueue_flush(VirtQueue *vq, unsigned int count);
-- 
1.8.3.1