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Re: [Qemu-devel] RFC: virtio-peer shared memory based peer communication
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] RFC: virtio-peer shared memory based peer communication device |
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Date: |
Mon, 21 Sep 2015 14:15:41 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 |
On 21/09/2015 12:47, Jan Kiszka wrote:
>> > Apart from the windows idea, how does virtio-peer compare to virtio-rpmsg?
> rpmsg is a very specialized thing. It targets single AMP cores, assuming
> that those have full access to the main memory.
Yes, this is why I did say "apart from the windows idea".
> And it is also a
> centralized approach where all message go through the main Linux
> instance. I suspect we could cover that use case as well with generic
> inter-vm shared memory device, but I didn't think about all details yet.
The virtqueue handling seems very similar between the two. However, the
messages for rpmsg however have a small header (struct rpmsg_hdr in
include/linux/rpmsg.h) and there is a weird feature bit VIRTIO_RPMSG_F_NS.
So I guess virtio-rpmsg and virtio-peer are about as similar as
virtio-serial and virtio-peer.
Paolo
- Re: [Qemu-devel] rfc: vhost user enhancements for vm2vm communication, (continued)
Re: [Qemu-devel] rfc: vhost user enhancements for vm2vm communication, Michael S. Tsirkin, 2015/09/01
Re: [Qemu-devel] rfc: vhost user enhancements for vm2vm communication, Claudio Fontana, 2015/09/07
Re: [Qemu-devel] RFC: virtio-peer shared memory based peer communication device, Michael S. Tsirkin, 2015/09/21
Re: [Qemu-devel] RFC: virtio-peer shared memory based peer communication device, Jan Kiszka, 2015/09/21
Re: [Qemu-devel] RFC: virtio-peer shared memory based peer communication device, Michael S. Tsirkin, 2015/09/24
Re: [Qemu-devel] rfc: vhost user enhancements for vm2vm communication, Michael S. Tsirkin, 2015/09/09