netdev - Re: [PATCH 3/5] vDPA: introduce vDPA bus

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Message-ID: <20200120070710-mutt-send-email-mst@kernel.org>
Date:   Mon, 20 Jan 2020 07:09:07 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Shahaf Shuler <shahafs@...lanox.com>,
        Rob Miller <rob.miller@...adcom.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Netdev <netdev@...r.kernel.org>,
        "Bie, Tiwei" <tiwei.bie@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        "maxime.coquelin@...hat.com" <maxime.coquelin@...hat.com>,
        "Liang, Cunming" <cunming.liang@...el.com>,
        "Wang, Zhihong" <zhihong.wang@...el.com>,
        "Wang, Xiao W" <xiao.w.wang@...el.com>,
        "haotian.wang@...ive.com" <haotian.wang@...ive.com>,
        "Zhu, Lingshan" <lingshan.zhu@...el.com>,
        "eperezma@...hat.com" <eperezma@...hat.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        Parav Pandit <parav@...lanox.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "stefanha@...hat.com" <stefanha@...hat.com>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "hch@...radead.org" <hch@...radead.org>,
        Ariel Adam <aadam@...hat.com>,
        "jakub.kicinski@...ronome.com" <jakub.kicinski@...ronome.com>,
        Jiri Pirko <jiri@...lanox.com>,
        "hanand@...inx.com" <hanand@...inx.com>,
        "mhabets@...arflare.com" <mhabets@...arflare.com>
Subject: Re: [PATCH 3/5] vDPA: introduce vDPA bus

On Mon, Jan 20, 2020 at 04:44:34PM +0800, Jason Wang wrote:
> 
> On 2020/1/19 下午5:59, Michael S. Tsirkin wrote:
> > On Sun, Jan 19, 2020 at 09:07:09AM +0000, Shahaf Shuler wrote:
> > > > Technically, we can keep the incremental API
> > > > here and let the vendor vDPA drivers to record the full mapping
> > > > internally which may slightly increase the complexity of vendor driver.
> > > What will be the trigger for the driver to know it received the last mapping on this series and it can now push it to the on-chip IOMMU?
> > Some kind of invalidate API?
> > 
> 
> The problem is how to deal with the case of vIOMMU. When vIOMMU is enabling
> there's no concept of last mapping.
> 
> Thanks

Most IOMMUs have a translation cache so have an invalidate API too.

-- 
MST