[libvirt] ivshmem server

Osier Yang jyang at redhat.com
Wed Nov 21 04:44:10 UTC 2012

On 2012年11月21日 02:16, Andrew Jones wrote:
> This mail is meant to get a discussion started. Please keep me on cc
> for the discussion, as I'm not subscribed to libvir-list.
> ivshmem is an implementation of an inter-VM communication channel.
> Support for this has been in qemu since v0.14.0 and libvirt patches
> have been recently posted[1]. What's still missing is the ivshmem
> server. The ivshmem server is needed when one would like to use
> interrupts with ivshmem. The server manages a set of eventfds
> to send/recv those interrupts. There is currently only one
> implementation of this server that I'm aware of, which is available
> from this git repo [2] in the ivshmem-server directory. My suggestion
> for libvirt is that this code be integrated into libvirt, rather
> than managed by libvirt, for the following reasons
> 1. libvirt should keep track of the socket path in order to build
>     ivshmem's command line anyway.
> 2. the current ivshmem server code is ~300 lines, so it shouldn't be
>     a large integration effort.
> 3. keeping ivhsmem server separate increases the package management
>     that distributions need to do. afaik, it isn't currently packaged
>     for any distribution.
> One concern I have with the git repo [2] is that I don't see any
> license for ivshmem-server. I've cc'ed Cam for his input.

Add the missed CC.

> Drew
> [1] http://www.redhat.com/archives/libvir-list/2012-November/msg00731.html
> [2] git://gitorious.org/nahanni/guest-code.git
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