From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Fri, 16 Jul 2010 03:30:18 +0000 (+0800)
Subject: KVM: MMU: using __xchg_spte more smarter
X-Git-Tag: v2.6.36-rc1~580^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9a3aad70572c3f4d55e7f09ac4eb313d41d0a484;p=pandora-kernel.git

KVM: MMU: using __xchg_spte more smarter

Sometimes, atomically set spte is not needed, this patch call __xchg_spte()
more smartly

Note: if the old mapping's access bit is already set, we no need atomic operation
since the access bit is not lost

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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