From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: 9d02b43dee0d7fb18dfb13a00915550b1a3daa9f (xen PVonHVM:
 use E820_Reserved area for shared_info) causes regression with 32-bit PVHVM
 guests (v3.8-rcX) on Xen 4.1
Date: Wed, 13 Feb 2013 13:11:03 -0500
Message-ID: <20130213181103.GC20042@phenom.dumpdata.com>
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To: olaf@aepfle.de, xen-devel@lists.xensource.com
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Hey Olaf,

The commit 9d02b43dee0d7fb18dfb13a00915550b1a3daa9f
(xen PVonHVM: use E820_Reserved area for shared_info) causes
a regression when doing 'xm restore' (or migrate) of a 32-bit
PVHVM guest with Xen 4.1. This is xen-4.1-testing with v3.8-rc7
and me just doing 'xm save <name> <file>' followed by
'xm restore <file> && xm console <name>' and I don't see anything
on the serial console. The 'xentop' shows the guest consuming 100%
cycles spinning around in pvlock_read.

By just reverting this patch (well, also a7be94ac8d69c037d08f0fd94b45a593f1d45176)
the problem disappears.

Any thoughts of what might be wrong?