Re: [PATCH v1] vdpa/mlx5: Restore the hardware used index after change map

[Si-Wei Liu]

On 2/19/2021 6:38 PM, Jason Wang wrote:
> > > Right now the value is exposed to userspace via GET_VRING_BASE, so 
> > > only last_avail_idx is synced. If we need sync last_used_idx, we 
> > > should also sync pending indices which requires more thoughts.
> > Technically it doesn't sound right - crossing the boundary a bit even 
> > with simplified form of assumption. But depending on how userspace 
> > could make use of this API, it doesn't seem it breaks existing 
> > functionality for the moment.
>
>
> I don't get here, maybe you can explain a little bit more? 
Please refer to the email I just sent.

https://lore.kernel.org/lkml/033b0806-4037-5755-a1fa-91dbb58bab2e@xxxxxxxxxx/

-Siwei