KVM: use __copy_to_user/__clear_user to write guest page
Simply use __copy_to_user/__clear_user to write guest page since we have already verified the user address when the memslot is set Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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