linux-kernel - [REGRESSION][x86] Commit f5b2831d65 cause boot failure in VMware ESXi 5.1 guest

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Date:	Fri, 26 Dec 2014 09:57:42 +0800
From:	Qu Wenruo <quwenruo@...fujitsu.com>
To:	<jgross@...e.com>
CC:	<linux-kernel@...r.kernel.org>
Subject: [REGRESSION][x86] Commit f5b2831d65 cause boot failure in VMware
 ESXi 5.1 guest

Hi all,

When testing v3.19-rc1 kernel(in fact, try to test), the kernel itself 
fail to boot on VMware ESXi 5.1 guest.
The boot failure is quite easy to describe, only one line is output:
"Probing EDD (edd=off to disable)...ok"

No other output(including warning/bug_on/backtrace or whatever) and the 
guest just hangs.
It's OK on v3.18, so it's a regression.

Bisect points to the following commit:
commit f5b2831d654167d77da8afbef4d2584897b12d0c
Author: Juergen Gross <jgross@...e.com>
Date:   Mon Nov 3 14:02:02 2014 +0100

     x86: Respect PAT bit when copying pte values between large and 
normal pages

     The PAT bit in the ptes is not moved to the correct position when
     copying page protection attributes between entries of different sized
     pages. Translate the ptes according to their page size.


I have also created the kernel BZ report:
https://bugzilla.kernel.org/show_bug.cgi?id=90321

Hopes this can be resolved in next rc.

Thanks,
Qu

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