lkml.org 
[lkml]   [2020]   [Jun]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH RFC v8 02/11] vhost: use batched get_vq_desc version
From
Date

On 2020/6/23 下午3:00, Eugenio Perez Martin wrote:
> On Tue, Jun 23, 2020 at 4:51 AM Jason Wang <jasowang@redhat.com> wrote:
>>
>> On 2020/6/23 上午12:00, Michael S. Tsirkin wrote:
>>> On Wed, Jun 17, 2020 at 11:19:26AM +0800, Jason Wang wrote:
>>>> On 2020/6/11 下午7:34, Michael S. Tsirkin wrote:
>>>>> static void vhost_vq_free_iovecs(struct vhost_virtqueue *vq)
>>>>> {
>>>>> kfree(vq->descs);
>>>>> @@ -394,6 +400,9 @@ static long vhost_dev_alloc_iovecs(struct vhost_dev *dev)
>>>>> for (i = 0; i < dev->nvqs; ++i) {
>>>>> vq = dev->vqs[i];
>>>>> vq->max_descs = dev->iov_limit;
>>>>> + if (vhost_vq_num_batch_descs(vq) < 0) {
>>>>> + return -EINVAL;
>>>>> + }
>>>> This check breaks vdpa which set iov_limit to zero. Consider iov_limit is
>>>> meaningless to vDPA, I wonder we can skip the test when device doesn't use
>>>> worker.
>>>>
>>>> Thanks
>>> It doesn't need iovecs at all, right?
>>>
>>> -- MST
>>
>> Yes, so we may choose to bypass the iovecs as well.
>>
>> Thanks
>>
> I think that the kmalloc_array returns ZERO_SIZE_PTR for all of them
> in that case, so I didn't bother to skip the kmalloc_array parts.
> Would you prefer to skip them all and let them NULL? Or have I
> misunderstood what you mean?


I'm ok with either approach, but my understanding is that Michael wants
to skip them all.

Thanks


>
> Thanks!
>

\
 
 \ /
  Last update: 2020-06-23 09:16    [W:0.341 / U:1.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site