From: Cindy Lu <lulu@redhat.com>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: rdunlap@infradead.org, Michael Tsirkin <mst@redhat.com>,
mhabets@solarflare.com, qemu-devel@nongnu.org,
rob.miller@broadcom.com, saugatm@xilinx.com,
Markus Armbruster <armbru@redhat.com>,
hch@infradead.org, Eugenio Perez Martin <eperezma@redhat.com>,
jgg@mellanox.com, Jason Wang <jasowang@redhat.com>,
Shahaf Shuler <shahafs@mellanox.com>,
kevin.tian@intel.com, parav@mellanox.com, vmireyno@marvell.com,
"Liang, Cunming" <cunming.liang@intel.com>,
gdawar@xilinx.com, jiri@mellanox.com, xiao.w.wang@intel.com,
Stefan Hajnoczi <stefanha@redhat.com>,
"Wang, Zhihong" <zhihong.wang@intel.com>,
Maxime Coquelin <maxime.coquelin@redhat.com>,
Tiwei Bie <tiwei.bie@intel.com>, Ariel Adam <aadam@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
hanand@xilinx.com, "Zhu, Lingshan" <lingshan.zhu@intel.com>
Subject: Re: [RFC v2 5/9] vhost-vdpa: implement vhost-vdpa backend
Date: Mon, 25 May 2020 23:33:54 +0800 [thread overview]
Message-ID: <CACLfguUVO_zhZbrZ2bW--i5KrP+Yxe0EQwOCrtihSDqRADOKfA@mail.gmail.com> (raw)
In-Reply-To: <20200521124032.GH251811@stefanha-x1.localdomain>
On Thu, May 21, 2020 at 8:40 PM Stefan Hajnoczi <stefanha@gmail.com> wrote:
>
> On Sat, May 09, 2020 at 12:32:14AM +0800, Cindy Lu wrote:
> > From: Tiwei Bie <tiwei.bie@intel.com>
> >
> > Currently we have 2 types of vhost backends in QEMU: vhost kernel and
> > vhost-user. The above patch provides a generic device for vDPA purpose,
> > this vDPA device exposes to user space a non-vendor-specific configuration
> > interface for setting up a vhost HW accelerator, this patch set introduces
> > a third vhost backend called vhost-vdpa based on the vDPA interface.
> >
> > Vhost-vdpa usage:
> >
> > qemu-system-x86_64 -cpu host -enable-kvm \
> > ......
> > -netdev type=vhost-vdpa,vhostdev=/dev/vhost-vdpa-id,id=vhost-vdpa0 \
> > -device virtio-net-pci,netdev=vhost-vdpa0,page-per-vq=on \
>
> I haven't looked at vDPA in depth. What is different here compared to
> the existing vhost-backend.c kernel backend?
>
> It seems to be making the same ioctls calls so I wonder if it makes
> sense to share the vhost-backend.c kernel code?
>
> Stefan
Hi Stefan,
Sorry for the late reply and Thanks for these suggestions.
I think the most difference between vhost kernel and vdpa is vdpa
depends on a real hardware.
The point is that vDPA devices work as a virtio device, but vhost-vdpa
qemu must present a vhost-like device in qemu vhost layer.
The ioctl calls are similar with vhost-backend.c now, but after more
and more NIC support vdpa. The difference between vhost-backend.c and
vpda will become more and more big. It will make the code complicated
to share the code with kernel code.
Thanks
Cindy
next prev parent reply other threads:[~2020-05-25 15:35 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 16:32 [RFC v2 0/9] vDPA support in qemu Cindy Lu
2020-05-08 16:32 ` [RFC v2 1/9] net: introduce qemu_get_peer Cindy Lu
2020-05-08 16:32 ` [RFC v2 2/9] net: use the function qemu_get_peer Cindy Lu
2020-05-09 2:19 ` Jason Wang
2020-05-09 6:49 ` Cindy Lu
2020-05-08 16:32 ` [RFC v2 3/9] virtio_net: introduce vhost_set_state Cindy Lu
2020-05-09 2:25 ` Jason Wang
2020-05-09 7:08 ` Cindy Lu
2020-05-08 16:32 ` [RFC v2 4/9] vhost-vdpa: introduce vhost-vdpa net client Cindy Lu
2020-05-08 16:41 ` Eric Blake
2020-05-09 7:17 ` Cindy Lu
2020-05-09 2:40 ` Jason Wang
2020-05-09 7:31 ` Cindy Lu
2020-05-08 16:32 ` [RFC v2 5/9] vhost-vdpa: implement vhost-vdpa backend Cindy Lu
2020-05-09 3:00 ` Jason Wang
2020-05-09 3:07 ` Jason Wang
2020-05-09 8:14 ` Cindy Lu
2020-05-21 12:40 ` Stefan Hajnoczi
2020-05-25 15:33 ` Cindy Lu [this message]
2020-05-25 16:15 ` Stefan Hajnoczi
2020-05-08 16:32 ` [RFC v2 6/9] virtio-bus: introduce queue_enabled method Cindy Lu
2020-05-09 3:01 ` Jason Wang
2020-05-09 6:50 ` Cindy Lu
2020-05-08 16:32 ` [RFC v2 7/9] virito-pci: implement " Cindy Lu
2020-05-09 3:02 ` Jason Wang
2020-05-09 12:01 ` Philippe Mathieu-Daudé
2020-05-11 5:08 ` Cindy Lu
2020-05-08 16:32 ` [RFC v2 8/9] vhost_net: set vq ready during start if necessary Cindy Lu
2020-05-09 3:03 ` Jason Wang
2020-05-09 6:51 ` Cindy Lu
2020-05-08 16:32 ` [RFC v2 9/9] vhost: introduce vhost_set_vring_ready method Cindy Lu
2020-05-09 3:05 ` Jason Wang
2020-05-09 3:10 ` [RFC v2 0/9] vDPA support in qemu Jason Wang
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