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Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimiz

From: Amit Shah
Subject: Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization
Date: Thu, 10 Mar 2016 13:27:28 +0530

On (Thu) 10 Mar 2016 [07:44:19], Li, Liang Z wrote:
> Hi Amit,
>  Could provide more information on how to use virtio-serial to exchange data? 
>  Thread , Wiki or code are all OK. 
>  I have not find some useful information yet.

See this commit in the Linux sources:


that adds a way to send guest trace data over to the host.  I think
that's the most relevant to your use-case.  However, you'll have to
add an in-kernel user of virtio-serial (like the virtio-console code
-- the code that deals with tty and hvc currently).  There's no other
non-tty user right now, and this is the right kind of use-case to add
one for!

For many other (userspace) use-cases, see the qemu-guest-agent in the
qemu sources.

The API is documented in the wiki:


and the feature pages have some information that may help as well:


There are some links in here too:


Hope this helps.


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