vhost+postcopy: Helper to send requests to source for shared pages
Provide a helper to be used by shared waker functions to request shared pages from the source. The last_rb pointer is moved into the incoming state since this helper can update it as well as the main fault thread function. Signed-off-by: NDr. David Alan Gilbert <dgilbert@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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