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

[Qu Wenruo]

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@xxxxxxxx>
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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