From: Stefan Hajnoczi <stefanha@redhat.com>
To: Yongji Xie <xieyongji@bytedance.com>
Cc: "Jens Axboe" <axboe@kernel.dk>,
"Jonathan Corbet" <corbet@lwn.net>,
kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
netdev@vger.kernel.org, "Randy Dunlap" <rdunlap@infradead.org>,
"Matthew Wilcox" <willy@infradead.org>,
virtualization@lists.linux-foundation.org,
"Christoph Hellwig" <hch@infradead.org>,
"Christian Brauner" <christian.brauner@canonical.com>,
bcrl@kvack.org, viro@zeniv.linux.org.uk,
linux-fsdevel@vger.kernel.org,
"Dan Carpenter" <dan.carpenter@oracle.com>,
"Mika Penttilä" <mika.penttila@nextfour.com>
Subject: Re: Re: Re: [PATCH v6 10/10] Documentation: Add documentation for VDUSE
Date: Thu, 15 Apr 2021 15:17:47 +0100 [thread overview]
Message-ID: <YHhLCyF/2VYzrL3g@stefanha-x1.localdomain> (raw)
In-Reply-To: <CACycT3tRN1n_PJm1mu3=s1dK941Pac15cpaysqZZKLR6xKaXSg@mail.gmail.com>
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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@redhat.com> 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@redhat.com> 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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prev parent reply other threads:[~2021-04-15 14:18 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210331080519.172-1-xieyongji@bytedance.com>
[not found] ` <20210331080519.172-2-xieyongji@bytedance.com>
[not found] ` <20210331091545.lr572rwpyvrnji3w@wittgenstein>
2021-03-31 9:26 ` [PATCH v6 01/10] file: Export receive_fd() to modules Dan Carpenter
[not found] ` <20210331080519.172-8-xieyongji@bytedance.com>
2021-04-08 2:36 ` [PATCH v6 07/10] vdpa: Support transferring virtual addressing during DMA mapping Jason Wang
[not found] ` <20210331080519.172-9-xieyongji@bytedance.com>
2021-04-08 3:25 ` [PATCH v6 08/10] vduse: Implement an MMU-based IOMMU driver Jason Wang
[not found] ` <20210331080519.172-10-xieyongji@bytedance.com>
2021-04-08 6:57 ` [PATCH v6 09/10] vduse: Introduce VDUSE - vDPA Device in Userspace Jason Wang
[not found] ` <CACycT3v_KFQXoxRbEj8c0Ve6iKn9RbibtBDgBFs=rf0ZOmTBBQ@mail.gmail.com>
2021-04-09 5:36 ` Jason Wang
[not found] ` <CACycT3vwATp4+Ao0fjuyeeLQN+xHH=dXF+JUyuitkn4k8hELnA@mail.gmail.com>
2021-04-12 7:16 ` Jason Wang
[not found] ` <CACycT3vxO21Yt6+px2c2Q8DONNUNehdo2Vez_RKQCKe76CM2TA@mail.gmail.com>
2021-04-12 9:37 ` Jason Wang
[not found] ` <CACycT3vbDhUKM0OX-zo02go09gh2+EEdyZ_YQuz8PXzo3EngXw@mail.gmail.com>
2021-04-13 3:35 ` Jason Wang
[not found] ` <CACycT3tHxtfgQhQgv0VyF_U523qASEv1Ydc4XuX43MFRzGVbfw@mail.gmail.com>
2021-04-14 8:18 ` Jason Wang
2021-04-16 3:24 ` Jason Wang
[not found] ` <20210331080519.172-4-xieyongji@bytedance.com>
2021-04-09 16:15 ` [PATCH v6 03/10] vhost-vdpa: protect concurrent access to vhost device iotlb Michael S. Tsirkin
[not found] ` <CACycT3tPWwpGBNEqiL4NPrwGZhmUtAVHUZMOdbSHzjhN-ytg_A@mail.gmail.com>
2021-04-11 20:48 ` Michael S. Tsirkin
[not found] ` <CACycT3v5Z8s9_pL79m0FY5jxx3fTRHHbtARfg0On3xTnNCOdkg@mail.gmail.com>
2021-04-12 9:00 ` Michael S. Tsirkin
2021-04-14 7:34 ` [PATCH v6 00/10] Introduce VDUSE - vDPA Device in Userspace Michael S. Tsirkin
2021-04-14 7:49 ` Jason Wang
[not found] ` <20210331080519.172-11-xieyongji@bytedance.com>
2021-04-08 7:18 ` [PATCH v6 10/10] Documentation: Add documentation for VDUSE Jason Wang
2021-04-14 14:14 ` Stefan Hajnoczi
[not found] ` <CACycT3uNR+nZY5gY0UhPkeOyi7Za6XkX4b=hasuDcgqdc7fqfg@mail.gmail.com>
2021-04-15 7:19 ` Stefan Hajnoczi
2021-04-15 8:36 ` Jason Wang
2021-04-15 9:04 ` Jason Wang
[not found] ` <CACycT3tL7URz3n-KhMAwYH+Sn1e1TSyfU+RKcc8jpPDJ7WcZ2w@mail.gmail.com>
2021-04-16 2:20 ` Jason Wang
[not found] ` <CACycT3tyksBYxgbQLFJ-mFCKkaWotucM5_ho_K3q4wMpR0P=gw@mail.gmail.com>
2021-04-16 3:02 ` Jason Wang
2021-04-15 14:38 ` Stefan Hajnoczi
2021-04-16 2:23 ` Jason Wang
[not found] ` <CACycT3u_qAE=D_ezLPU9SpXPMACErmpqpH5pMg0TZAb3CZVGdg@mail.gmail.com>
2021-04-16 5:39 ` Jason Wang
[not found] ` <CACycT3tRN1n_PJm1mu3=s1dK941Pac15cpaysqZZKLR6xKaXSg@mail.gmail.com>
2021-04-15 14:17 ` Stefan Hajnoczi [this message]
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