From: David Vrabel <david.vrabel@citrix.com>
Date: Mon, 9 Jul 2012 10:39:06 +0000 (+0100)
Subject: xen/mm: zero PTEs for non-present MFNs in the initial page table
X-Git-Tag: v3.6-rc1~123^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=66a27dde9ae96e35278983f2e59bea04eb714cd0;p=pandora-kernel.git

xen/mm: zero PTEs for non-present MFNs in the initial page table

When constructing the initial page tables, if the MFN for a usable PFN
is missing in the p2m then that frame is initially ballooned out.  In
this case, zero the PTE (as in decrease_reservation() in
drivers/xen/balloon.c).

This is obviously safe instead of having an valid PTE with an MFN of
INVALID_P2M_ENTRY (~0).

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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