For those “oh poop” moments
I was in a situation where I had a running Xen guest, but the config file that defined the DomU was missing.
Fortunately, the listing command (xl list) has a long option, xl list -l, which prints out domain information in JSON format. This includes config information, from which the DomU configuration can be rebuilt.
Update: I hit a snag three months later when the config of one of the DomU’s wasn’t quite right, resulting in an “Unable to find partition containing kernel” error, but that was fixable
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