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 <jan.kis...@siemens.com > > <mailto:jan.kis...@siemens.com>> 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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