linux-kernel - Re: [PATCH] Lguest32, use guest page tables to find paddr for emulated instructions

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Message-Id: <1175743584.9371.47.camel@localhost.localdomain>
Date:	Wed, 04 Apr 2007 23:26:24 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	virtualization@...ts.osdl.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Glauber de Oliveira Costa <glommer@...il.com>
Subject: Re: [PATCH] Lguest32, use guest page tables to find paddr for
	emulated instructions

On Thu, 2007-04-05 at 12:59 +1000, Rusty Russell wrote:
> On Wed, 2007-04-04 at 15:07 -0400, Steven Rostedt wrote:

> Yeah, I haven't tried loading random modules but I can imagine this does
> happen (what module was it, BTW?)

I have no idea of which module it crashed on. I didn't investigate that
too much.  I could simply send a trap to guest when 
__pa(addr) != lguest_find_guest_paddr(addr) and see which module it
crashed on.

My block device I used was basically a copy of a RHEL5 system. I only
modified the inittab and fstab to get it working.  So on startup and
doing the udev init was when it crashed.

> 
> I used to have a function just like this, but managed to get rid of
> it.  
> 
> Hmm, perhaps we should have an "int lgread_virt_byte(u8 *)" which does
> the pgtable walk and read all in one?  It won't be efficient, but it'll
> be more correct and maybe even fewer lines 8)

I forgot that you have a goal to keep lguest small :)

Perhaps we can fork, and have lguest and lguest-lite.

-- Steve

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