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libvhost-user: mprotect & madvises for postcopy
Clear the area and turn off THP. PROT_NONE the area until after we've userfault advised it to catch any unexpected changes. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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