Hello, Oleksandr, thank you for Cc-ing Andrii. Andrii, thank you for the comment! On Fri, 15 Jul 2022 15:00:10 +0300 Andrii Chepurnyi <andrii.chepurnyi82@xxxxxxxxx> wrote: > [-- Attachment #1: Type: text/plain, Size: 5237 bytes --] > > Hello All, > > I faced the mentioned issue recently and just to bring more context here is > our setup: > We use pvblock backend for Android guest. It starts using u-boot with > pvblock support(which frontend doesn't support the persistent grants > feature), later it loads and starts the Linux kernel(which frontend > supports the persistent grants feature). So in total, we have sequent two > different frontends reconnection, the first of which doesn't support > persistent grants. > So the original patch [1] perfectly solves the original issue and provides > the ability to use persistent grants after the reconnection when Linux > frontend which supports persistent grants comes into play. > At the same time [2] will disable the persistent grants feature for the > first and second frontend. Thank you for this great explanation of your situation. > Is it possible to keep [1] as is? Yes, my concerns about Max's original patch[1] are conflicting behavior description in the document[1] and different behavior on blkfront-side 'feature_persistent' parameter. I will post Max's patch again with patches for blkfront behavior change and Documents updates. [1] https://lore.kernel.org/xen-devel/20220121102309.27802-1-sj@xxxxxxxxxx/ Thanks, SJ > > [1] > https://lore.kernel.org/xen-devel/20220106091013.126076-1-mheyne@xxxxxxxxx/ > [2] https://lore.kernel.org/xen-devel/20220714224410.51147-1-sj@xxxxxxxxxx/ > > Best regards, > Andrii > > On Fri, Jul 15, 2022 at 1:15 PM Oleksandr <olekstysh@xxxxxxxxx> wrote: > > > > > On 15.07.22 01:44, SeongJae Park wrote: > > > > > > Hello all. > > > > Adding Andrii Chepurnyi to CC who have played with the use-case which > > required reconnect recently and faced some issues with > > feature_persistent handling. [...]
