KVM: MMU: clear apfs if page state is changed
If CR0.PG is changed, the page fault cann't be avoid when the prefault address is accessed later And it also fix a bug: it can retry a page enabled #PF in page disabled context if mmu is shadow page This idear is from Gleb Natapov Signed-off-by: NXiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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