qemu-devel.nongnu.org archive mirror
 help / color / mirror / Atom feed
From: Pankaj Gupta <pagupta@redhat.com>
To: pannengyuan@huawei.com
Cc: liyiting@huawei.com, kuhn chenqun <kuhn.chenqun@huawei.com>,
	zhang zhanghailiang <zhang.zhanghailiang@huawei.com>,
	qemu-devel@nongnu.org, mst@redhat.com
Subject: Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer
Date: Wed, 4 Dec 2019 03:33:07 -0500 (EST)	[thread overview]
Message-ID: <606337023.38890965.1575448387620.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <1575444716-17632-1-git-send-email-pannengyuan@huawei.com>


> From: Pan Nengyuan <pannengyuan@huawei.com>
> 
> Devices tend to maintain vq pointers, allow deleting them trough a vq
> pointer.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
> ---
> Changes v2 to v1:
> - add a new function virtio_delete_queue to cleanup vq through a vq pointer
> ---
>  hw/virtio/virtio.c         | 16 +++++++++++-----
>  include/hw/virtio/virtio.h |  2 ++
>  2 files changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
> index 04716b5..6de3cfd 100644
> --- a/hw/virtio/virtio.c
> +++ b/hw/virtio/virtio.c
> @@ -2330,17 +2330,23 @@ 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);
> +    vq->used_elems = NULL;
> +}
> +
>  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 c32a815..e18756d 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);
> --
> 2.7.2.windows.1
> 
> 
Overall it ooks good to me.

Just one point: e.g in virtio_rng: "virtio_rng_device_unrealize" function
We are doing :     virtio_del_queue(vdev, 0);

One can directly call "virtio_delete_queue". It can become confusing
to call multiple functions for same purpose. Instead, Can we make 
"virtio_delete_queue" static inline?

Other than that:
Reviewed-by: Pankaj Gupta <pagupta@redhat.com>

> 
> 



  parent reply	other threads:[~2019-12-04  8:46 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04  7:31 [PATCH v2 1/3] virtio: add ability to delete vq through a pointer pannengyuan
2019-12-04  7:31 ` [PATCH v2 2/3] virtio-balloon: fix memory leak while attach virtio-balloon device pannengyuan
2019-12-04 10:16   ` Laurent Vivier
2019-12-04  7:31 ` [PATCH v2 3/3] virtio-serial-bus: fix memory leak while attach virtio-serial-bus pannengyuan
2019-12-04 10:17   ` Laurent Vivier
2019-12-04 14:41   ` Eric Blake
2019-12-09 16:51   ` Michael S. Tsirkin
2019-12-04  8:33 ` Pankaj Gupta [this message]
2019-12-05  2:30   ` [PATCH v2 1/3] virtio: add ability to delete vq through a pointer Pan Nengyuan
2019-12-05  4:51     ` Pankaj Gupta
2019-12-09 15:58   ` Michael S. Tsirkin
2019-12-04  9:40 ` Laurent Vivier
2019-12-04 14:40 ` Eric Blake
2019-12-05  2:35   ` Pan Nengyuan
2019-12-05 16:45 ` Amit Shah
2019-12-06  2:17   ` Pan Nengyuan
2019-12-06  8:56     ` Amit Shah
2019-12-06  9:00       ` Pan Nengyuan
2019-12-09 16:43 ` Michael S. Tsirkin
2019-12-09 16:58   ` Michael S. Tsirkin
2019-12-10  2:08     ` Pan Nengyuan

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=606337023.38890965.1575448387620.JavaMail.zimbra@redhat.com \
    --to=pagupta@redhat.com \
    --cc=kuhn.chenqun@huawei.com \
    --cc=liyiting@huawei.com \
    --cc=mst@redhat.com \
    --cc=pannengyuan@huawei.com \
    --cc=qemu-devel@nongnu.org \
    --cc=zhang.zhanghailiang@huawei.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).