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Subject: Re: [virtio-dev] Memory sharing device
On Tue, Feb 12, 2019 at 11:02:19PM -0500, Michael S. Tsirkin wrote: > On Tue, Feb 12, 2019 at 06:50:29PM -0800, Frank Yang wrote: > > > > > > On Tue, Feb 12, 2019 at 11:06 AM Michael S. Tsirkin <mst@redhat.com> wrote: > > > > On Tue, Feb 12, 2019 at 09:26:10AM -0800, Frank Yang wrote: > > > BTW, the other unique aspect is that the ping messages allow a _host_ > > pointer > > > to serve as the lump of shared memory; > > > then there is no need to track buffers in the guest kernel and the device > > > implementation can perform specialize buffer space management. > > > Because it is also host pointer shared memory, it is also physically > > contiguous > > > and there is no scatterlist needed to process the traffic. > > > > Yes at the moment virtio descriptors all pass addresses guest to host. > > > > Ability to reverse that was part of the vhost-pci proposal a while ago. > > BTW that also at least originally had ability to tunnel > > multiple devices over a single connection. > > > > > > > > Can there be a similar proposal for virtio-pci without vhsot? > > > > There was nothing wrong with the proposals I think, they > > just had to be polished a bit before making it into the spec. > > And that runneling was dropped but I think it can be brought back > > if desired, we just didn't see a use for it. > > > > > > Thinking about it more, I think vhost-pci might be too much for us due to the > > vhost requirement (sockets and IPC while we desire a highly process local > > solution) > > I agree because the patches try to document a bunch of stuff. > But I really just mean taking the host/guest interface > part from there. Tomorrow I'll try to write up a little bit more about the vhost pci ideas. The patches on list go deep into envisioned implementation detail within qemu instead of the actual host/guest interface. You should then be able to figure out they are relevant for you. -- MST
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