From: Annie Li <annie.li@oracle.com>
Date: Mon, 12 Dec 2011 10:14:42 +0000 (+0800)
Subject: xen/granttable: Support sub-page grants
X-Git-Tag: v3.3-rc1~129^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6666754b11297526c699f8df63c52d50c24fe946;p=pandora-kernel.git

xen/granttable: Support sub-page grants

- They can't be used to map the page (so can only be used in a GNTTABOP_copy
  hypercall).
- It's possible to grant access with a finer granularity than whole pages.
- Xen guarantees that they can be revoked quickly (a normal map grant can
  only be revoked with the cooperation of the domain which has been granted
  access).

Signed-off-by: Annie Li <annie.li@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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