linux-kernel - RE: [PATCH v4 0/4] Implement vdpasim stop operation

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Message-ID: <PH0PR12MB5481B65329F3F21CE1F938D2DCAF9@PH0PR12MB5481.namprd12.prod.outlook.com>
Date:   Fri, 17 Jun 2022 02:42:20 +0000
From:   Parav Pandit <parav@...dia.com>
To:     Jason Wang <jasowang@...hat.com>
CC:     "Michael S. Tsirkin" <mst@...hat.com>,
        Eugenio Pérez <eperezma@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "martinh@...inx.com" <martinh@...inx.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "martinpo@...inx.com" <martinpo@...inx.com>,
        "lvivier@...hat.com" <lvivier@...hat.com>,
        "pabloc@...inx.com" <pabloc@...inx.com>,
        Eli Cohen <elic@...dia.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Zhang Min <zhang.min9@....com.cn>,
        Wu Zongyong <wuzongyong@...ux.alibaba.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>,
        "Piotr.Uminski@...el.com" <Piotr.Uminski@...el.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        "ecree.xilinx@...il.com" <ecree.xilinx@...il.com>,
        "gautam.dawar@....com" <gautam.dawar@....com>,
        "habetsm.xilinx@...il.com" <habetsm.xilinx@...il.com>,
        "tanuj.kamde@....com" <tanuj.kamde@....com>,
        "hanand@...inx.com" <hanand@...inx.com>,
        "dinang@...inx.com" <dinang@...inx.com>,
        Longpeng <longpeng2@...wei.com>
Subject: RE: [PATCH v4 0/4] Implement vdpasim stop operation



> From: Jason Wang <jasowang@...hat.com>
> Sent: Thursday, June 16, 2022 9:15 PM
> 
> On Fri, Jun 17, 2022 at 3:36 AM Parav Pandit <parav@...dia.com> wrote:
> >
> >
> > > From: Jason Wang <jasowang@...hat.com>
> > > Sent: Tuesday, June 14, 2022 9:29 PM
> > >
> > > Well, it's an example of how vDPA is implemented. I think we agree
> > > that for vDPA, vendors have the flexibility to implement their perferrable
> datapath.
> > >
> > Yes for the vdpa level and for the virtio level.
> >
> > > >
> > > > I remember few months back, you acked in the weekly meeting that
> > > > TC has
> > > approved the AQ direction.
> > > > And we are still in this circle of debating the AQ.
> > >
> > > I think not. Just to make sure we are on the same page, the proposal
> > > here is for vDPA, and hope it can provide forward compatibility to
> > > virtio. So in the context of vDPA, admin virtqueue is not a must.
> > In context of vdpa over virtio, an efficient transport interface is needed.
> > If AQ is not much any other interface such as hundreds to thousands of
> registers is not must either.
> >
> > AQ is one interface proposed with multiple benefits.
> > I haven’t seen any other alternatives that delivers all the benefits.
> > Only one I have seen is synchronous config registers.
> >
> > If you let vendors progress, handful of sensible interfaces can exist, each
> with different characteristics.
> > How would we proceed from here?
> 
> I'm pretty fine with having admin virtqueue in the virtio spec. If you
> remember, I've even submitted a proposal to use admin virtqueue as a
> transport last year.
> 
> Let's just proceed in the virtio-dev list.

o.k. thanks. I am aligned with your thoughts now.