postcopy: postcopy_notify_shared_wake
Add a hook to allow a client userfaultfd to be 'woken' when a page arrives, and a walker that calls that hook for relevant clients given a RAMBlock and offset. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NPeter Xu <peterx@redhat.com> Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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