[PATCH v2 0/2] delete virtio queues in vhost-user-blk-unrealize

[PATCH v2 0/2] delete virtio queues in vhost-user-blk-unrealize

[pannengyuan]

From: Pan Nengyuan <pannengyuan@huawei.com>

This series patch fix memleaks when detaching vhost-user-blk device.
1. use old virtio_del_queue to fix memleaks, it's easier for stable branches to merge.
   As the discussion in https://lists.nongnu.org/archive/html/qemu-devel/2020-01/msg02903.html

2. convert virtio_del_queue to the new one(virtio_delete_queue).

v2->v1: rename vqs to vhost_vqs to avoid confusing with virtqs (suggented by Stefan Hajnoczi)

Pan Nengyuan (2):
  vhost-user-blk: delete virtioqueues in unrealize to fix memleaks
  vhost-use-blk: convert to new virtio_delete_queue

 hw/block/vhost-user-blk.c          | 23 +++++++++++++++++------
 include/hw/virtio/vhost-user-blk.h |  3 ++-
 2 files changed, 19 insertions(+), 7 deletions(-)

-- 
2.18.2

[PATCH v2 1/2] vhost-user-blk: delete virtioqueues in unrealize to fix memleaks

[pannengyuan]

From: Pan Nengyuan <pannengyuan@huawei.com>

virtio queues forgot to delete in unrealize, and aslo error path in
realize, this patch fix these memleaks, the leak stack is as follow:

Direct leak of 114688 byte(s) in 16 object(s) allocated from:
    #0 0x7f24024fdbf0 in calloc (/lib64/libasan.so.3+0xcabf0)
    #1 0x7f2401642015 in g_malloc0 (/lib64/libglib-2.0.so.0+0x50015)
    #2 0x55ad175a6447 in virtio_add_queue /mnt/sdb/qemu/hw/virtio/virtio.c:2327
    #3 0x55ad17570cf9 in vhost_user_blk_device_realize /mnt/sdb/qemu/hw/block/vhost-user-blk.c:419
    #4 0x55ad175a3707 in virtio_device_realize /mnt/sdb/qemu/hw/virtio/virtio.c:3509
    #5 0x55ad176ad0d1 in device_set_realized /mnt/sdb/qemu/hw/core/qdev.c:876
    #6 0x55ad1781ff9d in property_set_bool /mnt/sdb/qemu/qom/object.c:2080
    #7 0x55ad178245ae in object_property_set_qobject /mnt/sdb/qemu/qom/qom-qobject.c:26
    #8 0x55ad17821eb4 in object_property_set_bool /mnt/sdb/qemu/qom/object.c:1338
    #9 0x55ad177aeed7 in virtio_pci_realize /mnt/sdb/qemu/hw/virtio/virtio-pci.c:1801

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
v2->v1: There is no change in this patch(only change the patch2/2)
---
 hw/block/vhost-user-blk.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index d8c459c575..2eba8b9db0 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -460,6 +460,9 @@ reconnect:
 virtio_err:
     g_free(s->vqs);
     g_free(s->inflight);
+    for (i = 0; i < s->num_queues; i++) {
+        virtio_del_queue(vdev, i);
+    }
     virtio_cleanup(vdev);
     vhost_user_cleanup(&s->vhost_user);
 }
@@ -468,6 +471,7 @@ static void vhost_user_blk_device_unrealize(DeviceState *dev, Error **errp)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VHostUserBlk *s = VHOST_USER_BLK(dev);
+    int i;
 
     virtio_set_status(vdev, 0);
     qemu_chr_fe_set_handlers(&s->chardev,  NULL, NULL, NULL,
@@ -476,6 +480,10 @@ static void vhost_user_blk_device_unrealize(DeviceState *dev, Error **errp)
     vhost_dev_free_inflight(s->inflight);
     g_free(s->vqs);
     g_free(s->inflight);
+
+    for (i = 0; i < s->num_queues; i++) {
+        virtio_del_queue(vdev, i);
+    }
     virtio_cleanup(vdev);
     vhost_user_cleanup(&s->vhost_user);
 }
-- 
2.18.2

[PATCH v2 2/2] vhost-use-blk: convert to new virtio_delete_queue

[pannengyuan]

From: Pan Nengyuan <pannengyuan@huawei.com>

use the new virtio_delete_queue function to cleanup.

Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
---
V2->V1:
- rename vqs to vhost_vqs to avoid confusing with virtqs (suggented by Stefan Hajnoczi)
---
 hw/block/vhost-user-blk.c          | 19 +++++++++++--------
 include/hw/virtio/vhost-user-blk.h |  3 ++-
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index 2eba8b9db0..12925a47ec 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -306,7 +306,7 @@ static int vhost_user_blk_connect(DeviceState *dev)
     s->connected = true;
 
     s->dev.nvqs = s->num_queues;
-    s->dev.vqs = s->vqs;
+    s->dev.vqs = s->vhost_vqs;
     s->dev.vq_index = 0;
     s->dev.backend_features = 0;
 
@@ -420,13 +420,14 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
     virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK,
                 sizeof(struct virtio_blk_config));
 
+    s->virtqs = g_new(VirtQueue *, s->num_queues);
     for (i = 0; i < s->num_queues; i++) {
-        virtio_add_queue(vdev, s->queue_size,
-                         vhost_user_blk_handle_output);
+        s->virtqs[i] = virtio_add_queue(vdev, s->queue_size,
+                                        vhost_user_blk_handle_output);
     }
 
     s->inflight = g_new0(struct vhost_inflight, 1);
-    s->vqs = g_new0(struct vhost_virtqueue, s->num_queues);
+    s->vhost_vqs = g_new0(struct vhost_virtqueue, s->num_queues);
     s->watch = 0;
     s->connected = false;
 
@@ -458,11 +459,12 @@ reconnect:
     return;
 
 virtio_err:
-    g_free(s->vqs);
+    g_free(s->vhost_vqs);
     g_free(s->inflight);
     for (i = 0; i < s->num_queues; i++) {
-        virtio_del_queue(vdev, i);
+        virtio_delete_queue(s->virtqs[i]);
     }
+    g_free(s->virtqs);
     virtio_cleanup(vdev);
     vhost_user_cleanup(&s->vhost_user);
 }
@@ -478,12 +480,13 @@ static void vhost_user_blk_device_unrealize(DeviceState *dev, Error **errp)
                              NULL, NULL, NULL, false);
     vhost_dev_cleanup(&s->dev);
     vhost_dev_free_inflight(s->inflight);
-    g_free(s->vqs);
+    g_free(s->vhost_vqs);
     g_free(s->inflight);
 
     for (i = 0; i < s->num_queues; i++) {
-        virtio_del_queue(vdev, i);
+        virtio_delete_queue(s->virtqs[i]);
     }
+    g_free(s->virtqs);
     virtio_cleanup(vdev);
     vhost_user_cleanup(&s->vhost_user);
 }
diff --git a/include/hw/virtio/vhost-user-blk.h b/include/hw/virtio/vhost-user-blk.h
index 108bfadeeb..05ea0ad183 100644
--- a/include/hw/virtio/vhost-user-blk.h
+++ b/include/hw/virtio/vhost-user-blk.h
@@ -36,7 +36,8 @@ typedef struct VHostUserBlk {
     struct vhost_dev dev;
     struct vhost_inflight *inflight;
     VhostUserState vhost_user;
-    struct vhost_virtqueue *vqs;
+    struct vhost_virtqueue *vhost_vqs;
+    VirtQueue **virtqs;
     guint watch;
     bool connected;
 } VHostUserBlk;
-- 
2.18.2

Re: [PATCH v2 0/2] delete virtio queues in vhost-user-blk-unrealize

[Stefan Hajnoczi]

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On Mon, Feb 24, 2020 at 12:13:34PM +0800, pannengyuan@huawei.com wrote:
> From: Pan Nengyuan <pannengyuan@huawei.com>
> 
> This series patch fix memleaks when detaching vhost-user-blk device.
> 1. use old virtio_del_queue to fix memleaks, it's easier for stable branches to merge.
>    As the discussion in https://lists.nongnu.org/archive/html/qemu-devel/2020-01/msg02903.html
> 
> 2. convert virtio_del_queue to the new one(virtio_delete_queue).
> 
> v2->v1: rename vqs to vhost_vqs to avoid confusing with virtqs (suggented by Stefan Hajnoczi)
> 
> Pan Nengyuan (2):
>   vhost-user-blk: delete virtioqueues in unrealize to fix memleaks
>   vhost-use-blk: convert to new virtio_delete_queue
> 
>  hw/block/vhost-user-blk.c          | 23 +++++++++++++++++------
>  include/hw/virtio/vhost-user-blk.h |  3 ++-
>  2 files changed, 19 insertions(+), 7 deletions(-)
> 
> -- 
> 2.18.2
> 
> 

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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