linux-kernel - Re: [RELEASE] Lguest for 2.6.21

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Message-Id: <1178249946.23670.40.camel@localhost.localdomain>
Date:	Fri, 04 May 2007 13:39:06 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Matt Mackall <mpm@...enic.com>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [RELEASE] Lguest for 2.6.21

On Thu, 2007-05-03 at 22:20 -0500, Matt Mackall wrote:
> I take it both sides of the virtual device drivers are turned on by
> the lguest option?

Yeah, to quote the code in drivers/lguest/lguest_bus.c:

/* At the moment we build all the drivers into the kernel because they're so
 * simple: 8144 bytes for all three of them as I type this.  And as the console
 * really needs to be built in, it's actually only 3527 bytes for the network
 * and block drivers.

> For the purposes of kernel hacking, I'd want to boot into one build
> and repeatedly launch another build as a guest, thereby getting
> faster hack/build/test cycles than either qemu or full reboot.
> How tightly coupled are things here?

I do that all the time, too.  The main issue is that we provide no ABI
for lguest (at least, not yet), so if you actually change guest/host
kernel version, you're on your own...

Thanks!
Rusty.

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