Re: [Qemu-devel] Question regarding a special case VM communication

[Stefan Hajnoczi]

On Wed, Mar 02, 2016 at 08:55:26PM -0700, Jidong Xiao wrote:
> I have a Linux host machine, on which two Qemu/KVM virtual machines
> are launched. Let's say they are VM1 and VM2, and their corresponding
> processes on the host are Qemu1 and Qemu2. Inside VM2, I need nested
> virtualization, i.e., A qemu process is started inside VM2, let's say
> it's Qemu3, and a virtual machine VM3 is created accordingly.
> 
> What I want to achieve is: communication between Qemu1 and Qemu3. For
> example, if I need to migrate VM1 from Qemu1 to Qemu3, how do I
> achieve that? One naïve solution is just go through the TCP stack,
> however, since they are in the same host machine, is there any fast or
> efficient way to implement it? I.e., Something similar to Unix domain
> socket. I know Unix domain socket is not applicable to case like this,
> but I am just looking for something similar to that. Does anyone have
> any suggestions, ideas? Thanks.

Use TCP/IP.  The nested virtualization and migration aspect makes this
non-trivial unless you choose a network protocol that supports routing.

Stefan

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