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Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer
From: |
Pan Nengyuan |
Subject: |
Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer |
Date: |
Thu, 5 Dec 2019 10:30:31 +0800 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 |
On 2019/12/4 16:33, Pankaj Gupta wrote:
>
>> From: Pan Nengyuan <address@hidden>
>>
>> Devices tend to maintain vq pointers, allow deleting them trough a vq
>> pointer.
>>
>> Signed-off-by: Michael S. Tsirkin <address@hidden>
>> Signed-off-by: Pan Nengyuan <address@hidden>
>> ---
>> 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?
>
yes, It will be a little confused, but I think it will have the same
problem if we make "virtio_delete_queue" static inline. We can directly
call it aslo. (e.g virtio-serial-bus.c virtio-balloon.c).
How about replacing the function name to make it more clear (e.g
virtio_delete_queue -> virtio_queue_cleanup) ? It's too similar between
"virtio_del_queue" and "virtio_delete_queue".
> Other than that:
> Reviewed-by: Pankaj Gupta <address@hidden>
>
>>
>>
>
>
> .
>
- [PATCH v2 1/3] virtio: add ability to delete vq through a pointer, pannengyuan, 2019/12/04
- [PATCH v2 2/3] virtio-balloon: fix memory leak while attach virtio-balloon device, pannengyuan, 2019/12/04
- [PATCH v2 3/3] virtio-serial-bus: fix memory leak while attach virtio-serial-bus, pannengyuan, 2019/12/04
- Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer, Pankaj Gupta, 2019/12/04
- Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer, Laurent Vivier, 2019/12/04
- Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer, Eric Blake, 2019/12/04
- Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer, Amit Shah, 2019/12/05
- Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer, Michael S. Tsirkin, 2019/12/09