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Re: [Qemu-devel] Towards an ivshmem 2.0?
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] Towards an ivshmem 2.0? |
Date: |
Tue, 17 Jan 2017 09:59:10 +0000 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
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.
Stefan
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- [Qemu-devel] Towards an ivshmem 2.0?, Jan Kiszka, 2017/01/16
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Marc-André Lureau, 2017/01/16
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Jan Kiszka, 2017/01/16
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Wang, Wei W, 2017/01/17
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Jan Kiszka, 2017/01/17
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Wang, Wei W, 2017/01/20
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Jan Kiszka, 2017/01/20
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Wang, Wei W, 2017/01/22
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Måns Rullgård, 2017/01/23
- Re: [Qemu-devel] Towards an ivshmem 2.0?,
Stefan Hajnoczi <=
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Jan Kiszka, 2017/01/17
- Re: [Qemu-devel] Towards an ivshmem 2.0?, msuchanek, 2017/01/29
- Re: [Qemu-devel] Towards an ivshmem 2.0?, Stefan Hajnoczi, 2017/01/30
Re: [Qemu-devel] Towards an ivshmem 2.0?, Stefan Hajnoczi, 2017/01/16
Re: [Qemu-devel] Towards an ivshmem 2.0?, Markus Armbruster, 2017/01/23