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Re: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit

To: Ingo Molnar <mingo@xxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Mon, 30 Jun 2008 10:57:38 -0700
Cc: Nick Piggin <npiggin@xxxxxxx>, Mark McLoughlin <markmc@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Eduardo Habkost <ehabkost@xxxxxxxxxx>, Vegard Nossum <vegard.nossum@xxxxxxxxx>, Stephen Tweedie <sct@xxxxxxxxxx>, x86@xxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Yinghai Lu <yhlu.kernel@xxxxxxxxx>
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Ingo Molnar wrote:
* Ingo Molnar <mingo@xxxxxxx> wrote:

* Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

Ingo Molnar wrote:
with this config:

  http://redhat.com/~mingo/misc/config-Sun_Jun_29_10_29_11_CEST_2008.bad

i've saved the merged 2.6.26-rc8-tip-00241-gc6c8cb2-dirty tree into tip/tmp.x86.xen-64bit.Sun_Jun_29_10 and pushed it out, so you can test that exact version.
Looks like the setup.c unification missed the early_ioremap init from the early_ioremap unification. Unconditionally call early_ioremap_init().
applied to tip/x86/unify-setup - thanks Jeremy.

I've reactived the x86/xen-64bit branch and i'm testing it currently.

-tip auto-testing found pagetable corruption (CPA self-test failure):

[   32.956015] CPA self-test:
[   32.958822]  4k 2048 large 508 gb 0 x 
2556[ffff880000000000-ffff88003fe00000] miss 0
[   32.964000] CPA ffff88001d54e000: bad pte 1d4000e3
[   32.968000] CPA ffff88001d54e000: unexpected level 2
[   32.972000] CPA ffff880022c5d000: bad pte 22c000e3
[   32.976000] CPA ffff880022c5d000: unexpected level 2
[   32.980000] CPA ffff8800200ce000: bad pte 200000e3
[   32.984000] CPA ffff8800200ce000: unexpected level 2
[   32.988000] CPA ffff8800210f0000: bad pte 210000e3

config and full log can be found at:

 http://redhat.com/~mingo/misc/config-Mon_Jun_30_11_11_51_CEST_2008.bad

This config doesn't have CONFIG_DEBUG_KERNEL enabled, let alone CONFIG_CPA_DEBUG. I've noticed this seems to happen quite a lot: there's a disconnect between the log file and the config which is supposed to have built the kernel. Is there a bug in your test infrastructure?

   J

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