postcopy: Allow registering of fd handler
Allow other userfaultfd's to be registered into the fault thread so that handlers for shared memory can get responses. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NPeter Xu <peterx@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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