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Re: Making QEMU easier for management tools and applications

From: Kevin Wolf
Subject: Re: Making QEMU easier for management tools and applications
Date: Wed, 5 Feb 2020 14:09:46 +0100
User-agent: Mutt/1.12.1 (2019-06-15)

Am 28.01.2020 um 11:59 hat Kevin Wolf geschrieben:
> > > The other part that it needs to solve is how to be available by default
> > > without specifying anything on the command line. Basically, if I press
> > > Ctrl-Alt-2, I want to get to a monitor shell. If that shell is
> > > implemented internally or by an external Python process, I don't mind.
> > 
> > That is a harder part. (I rarely use Ctrl-Alt-2 actually; I mostly
> > use HMP on stdin).
> I don't think it would be that hard, actually.
> If you have a -qmp-shell option that takes a chardev and defaults to vc,
> you've solved the part with both stdio and Ctrl-Alt-2. Now all you need
> to do is launch the Python child process, pass it a pair of pipes for
> communication and forward everything between the pipes and the chardev.
> (That's the theory anyway.)

If someone is interested, I did a quick proof-of-concept hack:


It doesn't clean up anything properly (including the qmp-shell processes
it starts), but it spawns a usable qmp-shell on a user-specified
character device. stdio seems to work, though without readline
functionality (I suppose I still have line-buffering somewhere), vc
doesn't really work at all yet.

Try it out like this:

    $ ./qemu-storage-daemon --chardev stdio,id=m --monitor m,mode=qmp-shell
    monitor_qmp_event: 1
    Welcome to the QMP low-level shell!
    Connected to QEMU 4.2.50

    (QEMU) query-version
    {"return": {"qemu": {"micro": 50, "major": 4, "minor": 2}, "package": 
    (QEMU) quit

(Or use x86_64-softmmu/qemu-system-x86_64, but it's based on the
refactorings in the storage daemon branch, so why not try both at once?)

Polishing this to make it mergable would still require substantial work,
so at the moment I'm not planning to do this. But if someone wants to
pick it up, feel free (just let us know).

Hm, in fact... A qmp-shell GSoC project?


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