linux-kernel - Re: [RFC PATCH 00/28] Linux Kernel Library

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Message-ID: <20151104135015.GN29330@redhat.com>
Date:	Wed, 4 Nov 2015 13:50:15 +0000
From:	"Richard W.M. Jones" <rjones@...hat.com>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, thehajime@...il.com
Subject: Re: [RFC PATCH 00/28] Linux Kernel Library

On Wed, Nov 04, 2015 at 01:24:03AM +0200, Octavian Purdila wrote:
> Thanks for the pointers Richard, I am going to take a look at it.

Now I've had a chance to look at some of the example LKL tools, here's
what this actually involves.  It's not actually a great deal of work,
it could probably be done in a day or two, but see my question about
`lkl_sys_*' below.

libguestfs (the library part) needs to talk over an RPC connection to
its daemon.  See diagram here:

http://libguestfs.org/guestfs-internals.1.html

The code in src/launch-{direct,libvirt,uml,...}.c sets up that
connection and runs the daemon -- normally inside a qemu wrapper, but
it could be inside UML.  For LKL I think it should just fork the
daemon directly.

The daemon would then be linked to LKL.

So really what's needed is a src/launch-lkl.c probably modelled after
one of these current backends:

https://github.com/libguestfs/libguestfs/blob/master/src/launch-uml.c
https://github.com/libguestfs/libguestfs/blob/master/src/launch-unix.c

and then recompile the daemon to link to LKL:

https://github.com/libguestfs/libguestfs/tree/master/daemon

and pass the list of disk images to the daemon, probably best to do
that on the guestfsd command line.

My only problem here: you can't just link to daemon to LKL, do you
have to change all of the system calls from `foo' to `lkl_sys_foo'?
That's an awful lot of #ifdefs ...

Rich.

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