KVM: MMU: remove rmap before clear spte
Remove rmap before clear spte otherwise it will trigger BUG_ON() in some functions such as rmap_write_protect(). Signed-off-by: NXiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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