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Re: [Qemu-devel] Virtual RDMA device
From: |
Marcel Apfelbaum |
Subject: |
Re: [Qemu-devel] Virtual RDMA device |
Date: |
Mon, 7 Aug 2017 22:53:42 +0300 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 |
On 01/08/2017 0:52, Michael S. Tsirkin wrote:
On Mon, Jul 31, 2017 at 10:10:15PM +0300, Marcel Apfelbaum wrote:
[...]
This seems to be the mail thread with most CCs.
Hi Michael,
Please copy the upstream lists. virtio-dev, virtualization and
qemu-devel for starters. I'd say linux-rdma as well.
Sure, adding all the mentioned lists.
To recap:
Yuval and I succeeded to implement a QEMU pvrdma device that works
(with some limitations) with VMware's Linux driver.
The git can be found at:
https://github.com/yuvalshaia/qemu/tree/pvrdma.master.ibverbs
The QEMU RFC at:
https://patchwork.kernel.org/patch/9653893/
While we do plan to merge it to QEMU, as a next step it seems
to be a consensus that virtio should be used to implement guest<->host
communication; since the project is not small, we need a plan.
We will do our best to attend the Micro RDMA conference:
-
https://www.linuxplumbersconf.org/2017/rdma-microconference-accepted-into-the-linux-plumbers-conference/
The attached presentation draft is intended to be a starting point
for a discussion on how to continue the project.
I attached a presentation
draft with *current* implementation of the pvrdma
device.(please excuse my presentation skills).
It is supposed to be a starting point for discussing
a virtio-rdma device and for a presentation at
the RDMA Micro-conference.
Please feel free to review/add and point to
what important things have I missed and how
we can continue.
I'd suggest ignoring migration initially, just get
rdma with memory overcommit working. For that:
- come up with a timeline
- decide who works on each of 3 things
1. extend libibverbs
2. layer virtio in qemu on top
3. write guest driver
I want to mention there is another discussion on this matter:
https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg06012.html
That simply lists what is missing in libibverbs to be able to implement
a PV RDMA device with memory overcommit and migration on top.
We should converge somehow.
Once Yuval returns from his vacation we will send a v2.
Thanks,
Marcel
[...]
Thanks,
Marcel
pvrdma.odp
Description: application/vnd.oasis.opendocument.presentation
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