KVM: MMU: Add validate_direct_spte() helper
Add a helper to verify that a direct shadow page is valid wrt the required access permissions; drop the page if it is not valid. Reviewed-by: NXiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: NAvi Kivity <avi@redhat.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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