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KVM: MMU: using __xchg_spte more smarter
authorXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Fri, 16 Jul 2010 03:30:18 +0000 (11:30 +0800)
committerAvi Kivity <avi@redhat.com>
Mon, 2 Aug 2010 03:41:01 +0000 (06:41 +0300)
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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