On Thu, Apr 15, 2021 at 04:33:27PM +0800, Yongji Xie wrote: > On Thu, Apr 15, 2021 at 3:19 PM Stefan Hajnoczi <stefanha@xxxxxxxxxx> wrote: > > On Thu, Apr 15, 2021 at 01:38:37PM +0800, Yongji Xie wrote: > > > On Wed, Apr 14, 2021 at 10:15 PM Stefan Hajnoczi <stefanha@xxxxxxxxxx> wrote: > > > > On Wed, Mar 31, 2021 at 04:05:19PM +0800, Xie Yongji wrote: > > It's not obvious to me that there is a fundamental difference between > > the two approaches in terms of performance. > > > > > On the other > > > hand, we can handle the virtqueue in a unified way for both vhost-vdpa > > > case and virtio-vdpa case. Otherwise, userspace daemon needs to know > > > which iova ranges need to be accessed with pread(2)/pwrite(2). And in > > > the future, we might be able to avoid bouncing in some cases. > > > > Ah, I see. So bounce buffers are not used for vhost-vdpa? > > > > Yes. Okay, in that case I understand why mmap is used and it's nice to keep virtio-vpda and vhost-vdpa unified. Thanks! Stefan
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