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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: Fri, 27 Jun 2008 09:25:31 -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:
yeah, i guess so. Right now i only ran into the build failure so there's hope :) Here's a config that fails to build for sure:

  http://redhat.com/~mingo/misc/config-Fri_Jun_27_17_54_32_CEST_2008.bad

Will look at it shortly.

note, on 32-bit there's a yet unfixed initrd corruption bug i've bisected back to:

| 510be56adc4bb9fb229637a8e89268d987263614 is first bad commit
| commit 510be56adc4bb9fb229637a8e89268d987263614
| Author: Yinghai Lu <yhlu.kernel@xxxxxxxxx>
| Date:   Tue Jun 24 04:10:47 2008 -0700
|
|    x86: introduce init_memory_mapping for 32bit

so if you see something like that it's probably not a bug introduced by your changes. (and maybe you'll see why the above commit is buggy, i havent figured it out yet)

Well, on a non-PSE system find_early_table_space() will not allocate enough memory for ptes. But I posted the fix for that, and it's likely you're using PSE anyway. Nothing pops out from a quick re-read, but it could easily be mis-reserving the ramdisk memory or something.

   J

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