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Message-ID: <b5560ed4ee5d156056e560e5aab91f97@exys.org>
Date: Sun, 03 Jun 2012 13:15:54 +0200
From: aep <aep@...s.org>
To: <musl@...ts.openwall.com>
Subject: Re: Test environment for non-native archs
> This seems to be possible with qemu's support for exporting a virtual
> 9p share to the guest OS, but I haven't yet determined if it's
> possible to boot directly with the 9p share as the root fs,
user mode linux has humfs, but it's not in mainline. Instead there's
hostfs, which is broken by design.
I can never get the uml patches working so i didn't look further.
What i researched instead was if you could run boot inside virtualbox
from a vboxsf.
A kernel with initrd with the vboxsf stuff can access the "folders",
but it isn't booting because their vfs does permissions wrong.
The virtualbox build system makes me angry, so i didn't try fixing it.
Since you're using a debian, maybe the buildsystem works for you and
you can just hack the relevant parts in.
I think it's a matter of making couple more rpc calls to the hostdriver
and mapping "stat" in the guest to the host.
On Sat, 26 May 2012 23:18:40 -0400, Rich Felker wrote:
> Hi,
>
> I've been thinking a bit about further testing of ARM (for which I
> don't have a native environment) and ports to other systems, and
> realized that to be able to efficiently mix working on the native
> host
> and virtual target system (e.g. doing most of the compiling on the
> host), it's going to be desirable to have the Linux running under
> qemu
> using part of the host's filesystem as its root fs, instead of having
> a filesystem image.
>
or whether
> it's going to require a separate initial fs image and switch/pivot
> root afterwards (as you can tell, I'm not very familiar with this
> sort
> of setup).
>
> Anyone know the answer, or have some recipes I could use?
>
> Rich
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