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

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Date:	Wed, 4 Nov 2015 16:15:46 +0200
From:	Octavian Purdila <octavian.purdila@...el.com>
To:	"Richard W.M. Jones" <rjones@...hat.com>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Hajime Tazaki <thehajime@...il.com>
Subject: Re: [RFC PATCH 00/28] Linux Kernel Library

On Wed, Nov 4, 2015 at 3:50 PM, Richard W.M. Jones <rjones@...hat.com> wrote:
> 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 ...
>

We could redefine the syscalls/libc symbols to call lkl_sys_ functions
in launch-lkl, e.g.:

int opendir(const char *path)
{
   return lkl_opendir(new_path)
}
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