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Re: [Qemu-devel] Towards an ivshmem 2.0?

From: Jan Kiszka
Subject: Re: [Qemu-devel] Towards an ivshmem 2.0?
Date: Tue, 17 Jan 2017 11:32:31 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2017-01-17 10:59, Stefan Hajnoczi wrote:
> On Mon, Jan 16, 2017 at 02:10:17PM +0100, Jan Kiszka wrote:
>> On 2017-01-16 13:41, Marc-André Lureau wrote:
>>> On Mon, Jan 16, 2017 at 12:37 PM Jan Kiszka <address@hidden
>>> <mailto:address@hidden>> wrote:
>>>     So, this is our proposal. Would be great to hear some opinions if you
>>>     see value in adding support for such an "ivshmem 2.0" device to QEMU as
>>>     well and expand its ecosystem towards Linux upstream, maybe also DPDK
>>>     again. If you see problems in the new design /wrt what QEMU provides so
>>>     far with its ivshmem device, let's discuss how to resolve them. Looking
>>>     forward to any feedback!
>>> My feeling is that ivshmem is not being actively developped in qemu, but
>>> rather virtio-based solutions (vhost-pci for vm2vm).
>> As pointed out, for us it's most important to keep the design simple -
>> even at the price of "reinventing" some drivers for upstream (at least,
>> we do not need two sets of drivers because our interface is fully
>> symmetric). I don't see yet how vhost-pci could achieve the same, but
>> I'm open to learn more!
> The concept of symmetry is nice but only applies for communications
> channels like networking and serial.
> It doesn't apply for I/O that is fundamentally asymmetric like disk I/O.
> I just wanted to point this out because lack symmetry has also bothered
> me about virtio but it's actually impossible to achieve it for all
> device types.

That's true. Not sure what all is planned for vhost-pci. Our scope is
limited (though mass storage proxying could be interesting at some
point), plus there is the option to do X-over-network.


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