linux-kernel - Re: [BUG + PATCH/Bugfix] x86/lguest: fix pgdir pmd index calculation

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Message-ID: <20080225001816.GA2933@ubuntu>
Date:	Mon, 25 Feb 2008 02:18:16 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>, lguest@...abs.org,
	akpm <akpm@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>
Subject: Re: [BUG + PATCH/Bugfix] x86/lguest: fix pgdir pmd index
	calculation

On Sun, Feb 24, 2008 at 06:26:53PM +0200, Ahmed S. Darwish wrote:
> On Sun, Feb 24, 2008 at 05:18:14PM +0100, Ingo Molnar wrote:
> 
> > I've picked up your patch into x86.git#testing (until Rusty picks it 
> > up), you can track it the following way:
> > 
> >     http://people.redhat.com/mingo/x86.git/README
> > 
> > it has other lguest fixes as well - could you double-check that 
> > x86.git#testing works fine for you as-is? (i've just updated the git 
> > tree so it includes your fix as well)
> > 
> 
> Ofcourse. I'll send you the results by GMT night.
> 

This thread's main bug no longer appears. There's a new bug though,
but it looks nicer than the original ugly bug!. 

The new bug does *not* appear in mainline with the same patch. It's
a panic, but this time on the _guest_ side (which is the same host's
kernel).

[    0.023996] CPU: Intel(R) Pentium(R) M processor 1500MHz stepping 05
[    0.023996] Kernel panic - not syncing: Kernel compiled for Pentium+, requires TSC feature!
[    0.023996] Pid: 0, comm: swapper Not tainted 2.6.25-rc2-00815-g3db3a05 #64
[    0.024996]  [<c011bbc7>] panic+0x47/0x120
[    0.024996]  [<c0101b30>] lguest_power_off+0x0/0x20
[    0.024996]  [<c02a88c5>] check_bugs+0x155/0x170
[    0.024996]  [<c02a2b1f>] start_kernel+0x22f/0x2d0
[    0.024996]  [<c02a2390>] unknown_bootoption+0x0/0x1f0
[    0.024996]  [<c0101450>] lguest_restart+0x0/0x20
[    0.024996]  [<c0101450>] lguest_restart+0x0/0x20
[    0.024996]  [<c02a5e22>] lguest_init+0x282/0x290
[    0.024996]  =======================

I'll track it further in my first free time slot.

It seems lguest is very sensitive to x86 tree changes. Could it be 
included in a sort of automatic guest-boot testing, please ?

Thank you,

-- 

"Better to light a candle, than curse the darkness"

Ahmed S. Darwish
Homepage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com

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