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Re: [Xen-devel] Q: How to find own domid or uuid from domU?

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Q: How to find own domid or uuid from domU?
From: Markus Armbruster <armbru@xxxxxxxxxx>
Date: Thu, 18 May 2006 12:52:01 +0200
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In-reply-to: <87882c2fef4a6cb52eeb9881d1b4ca4a@xxxxxxxxxxxx> (Keir Fraser's message of "Thu, 18 May 2006 11:01:59 +0100")
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Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> writes:

> On 18 May 2006, at 10:46, Markus Armbruster wrote:
>> I can map from domid to uuid by reading /local/domain/DOMID/vm.
>> I got that to work by trying DOMIDs starting with 0 until the read
>> succeeds, but that's kind of gross.
>> I can think of some less gross methods to find my domid, but I'd still
>> be glad to hear suggestions.
> Don't use DOMID. It can change across save/restore and migration.

No plans to expose it to anything.  I got interested in it just as a
means to obtain the UUID.

>> Would you like to have an interface for obtaining one's UUID?  What
>> about adding a XENVER_get_uuid code to HYPERVISOR_xen_version()?
> That might be okay, although even that might appear to change if we
> implement things like VM fork in future.

No problem as long as the information remains available somewhere.

> Why does your guest need to know its ID?

So that managament tools have a way of associating a running domain
with persistent state such as config files, regardless of where on a
network the domain is running at any time.

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