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Re: [Xen-devel] Design session report: Live-Updating Xen

On 7/15/19 8:48 PM, Juergen Gross wrote:
On 15.07.19 21:31, Sarah Newman wrote:
On 7/15/19 11:57 AM, Foerster, Leonard wrote:
A key cornerstone for Live-update is guest transparent live migration
    -> for live migration: domid is a problem in this case
        -> randomize and pray does not work on smaller fleets
        -> this is not a problem for live-update
        -> BUT: as a community we shoudl make this restriction go away

Andrew Cooper pointed out to me that manually assigning domain IDs is supported in much of the code already. If guest transparent live migration gets merged, we'll look at passing in a domain ID to xl, which would be good enough for us. I don't know about the other toolstacks.

The main problem is the case where on the target host the domid of the
migrated domain is already in use by another domain. So you either need
a domid allocator spanning all hosts or the change of domid during
migration must be hidden from the guest for guest transparent migration.

Yes. There are some cluster management systems which use xl rather than xapi.
They could be extended to manage domain IDs if it's too difficult to allow
the domain ID to change during migration.


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