Re: Inter-VM device emulation (call on Mon 20th July 2020)

From: Jan Kiszka <jan.kiszka@siemens.com>
To: Stefan Hajnoczi <stefanha@redhat.com>,
	Nikos Dragazis <ndragazis@arrikto.com>
Cc: "John G. Johnson" <john.g.johnson@oracle.com>,
	"Andra-Irina Paraschiv" <andraprs@amazon.com>,
	kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
	qemu-devel@nongnu.org,
	"Maxime Coquelin" <maxime.coquelin@redhat.com>,
	"Alexander Graf" <graf@amazon.com>,
	"Thanos Makatos" <thanos.makatos@nutanix.com>,
	"Alex Bennée" <alex.bennee@linaro.org>
Subject: Re: Inter-VM device emulation (call on Mon 20th July 2020)
Date: Wed, 15 Jul 2020 13:28:07 +0200	[thread overview]
Message-ID: <deb5788e-c828-6996-025d-333cf2bca7ab@siemens.com> (raw)
In-Reply-To: <20200715112342.GD18817@stefanha-x1.localdomain>

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On 15.07.20 13:23, Stefan Hajnoczi wrote:
> Hi,
> Several projects are underway to create an inter-VM device emulation
> interface:
> 
>  * ivshmem v2
>    https://www.mail-archive.com/qemu-devel@nongnu.org/msg706465.html
> 
>    A PCI device that provides shared-memory communication between VMs.
>    This device already exists but is limited in its current form. The
>    "v2" project updates IVSHMEM's capabilities and makes it suitable as
>    a VIRTIO transport.
> 
>    Jan Kiszka is working on this and has posted specs for review.
> 
>  * virtio-vhost-user
>    https://www.mail-archive.com/virtio-dev@lists.oasis-open.org/msg06429.html
> 
>    A VIRTIO device that transports the vhost-user protocol. Allows
>    vhost-user device emulation to be implemented by another VM.
> 
>    Nikos Dragazis is working on this with QEMU, DPDK, and VIRTIO patches
>    posted.
> 
>  * VFIO-over-socket
>    https://github.com/tmakatos/qemu/blob/master/docs/devel/vfio-over-socket.rst
> 
>    Similar to the vhost-user protocol in spirit but for any PCI device.
>    Uses the Linux VFIO ioctl API as the protocol instead of vhost.
> 
>    It doesn't have a virtio-vhost-user equivalent yet, but the same
>    approach could be applied to VFIO-over-socket too.
> 
>    Thanos Makatos and John G. Johnson are working on this. The draft
>    spec is available.
> 
> Let's have a call to figure out:
> 
> 1. What is unique about these approaches and how do they overlap?
> 2. Can we focus development and code review efforts to get something
>    merged sooner?
> 
> Jan and Nikos: do you have time to join on Monday, 20th of July at 15:00
> UTC?
> https://www.timeanddate.com/worldclock/fixedtime.html?iso=20200720T1500
> 

Not at that slot, but one hour earlier or later would work for me (so far).

Jan

> Video call URL: https://bluejeans.com/240406010
> 
> It would be nice if Thanos and/or JJ could join the call too. Others
> welcome too (feel free to forward this email)!
> 
> Stefan
> 

-- 
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux

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