From: Vincenzo Maffione
The virtqueue_pop() implementation needs to check if the avail ring
contains some pending buffers. To perform this check, it is not
always necessary to fetch the avail_idx in the VQ memory, which is
expensive. This patch introduces a shadow variable tracking avail_idx
and
2016-01-19 19:48 GMT+01:00 Paolo Bonzini :
>
>
> On 19/01/2016 17:54, Michael S. Tsirkin wrote:
>> On Fri, Jan 15, 2016 at 01:41:57PM +0100, Paolo Bonzini wrote:
>>> From: Vincenzo Maffione
>>>
>>> The virtqueue_pop() implementation needs to check if the avail ring
>>> contains some pending buffer
On Tue, 19 Jan 2016 19:48:42 +0100
Paolo Bonzini wrote:
> >> @@ -1579,6 +1595,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int
> >> version_id)
> >> return -1;
> >> }
> >> vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]);
> >> +v
On 19/01/2016 17:54, Michael S. Tsirkin wrote:
> On Fri, Jan 15, 2016 at 01:41:57PM +0100, Paolo Bonzini wrote:
>> From: Vincenzo Maffione
>>
>> The virtqueue_pop() implementation needs to check if the avail ring
>> contains some pending buffers. To perform this check, it is not
>> always necess
On Fri, Jan 15, 2016 at 01:41:57PM +0100, Paolo Bonzini wrote:
> From: Vincenzo Maffione
>
> The virtqueue_pop() implementation needs to check if the avail ring
> contains some pending buffers. To perform this check, it is not
> always necessary to fetch the avail_idx in the VQ memory, which is
>
On Fri, 15 Jan 2016 13:41:57 +0100
Paolo Bonzini wrote:
> From: Vincenzo Maffione
>
> The virtqueue_pop() implementation needs to check if the avail ring
> contains some pending buffers. To perform this check, it is not
> always necessary to fetch the avail_idx in the VQ memory, which is
> expe
From: Vincenzo Maffione
The virtqueue_pop() implementation needs to check if the avail ring
contains some pending buffers. To perform this check, it is not
always necessary to fetch the avail_idx in the VQ memory, which is
expensive. This patch introduces a shadow variable tracking avail_idx
and
