qapi: Add device ID and head parameters to screendump
QEMU's screendump command can only take dumps from the primary display. When using multiple VGA cards, there is no way to get a dump from a secondary card or other display heads yet. So let's add a 'device' and a 'head' parameter to the HMP and QMP commands to be able to specify alternative devices and heads with the screendump command, too. Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com> Acked-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NGerd Hoffmann <kraxel@redhat.com> Signed-off-by: NThomas Huth <thuth@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Message-id: 1520267868-31778-1-git-send-email-thuth@redhat.com Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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