[Xen-devel] [PATCH] Fix restore handling checks

[Michal Novotny <minovotn@xxxxxxxxxx>]

Hi,
this is the patch to fix restore handling to implement some more checks 
to support more checks than for UUID and name duplicity. This patch 
basically disallows the migration/restore of IDE drives with the 
read-only flag since this is not supported according to the ATAPI/IDE 
specifications so we should disallow this for both domain creation and 
domain migration/restore. This patch implements it for both create and 
restore/migrate functionality.
Also, the check whether the host machine does have enough memory 
available for the guest has been implemented which can be the real issue 
when you try to migrate a guest from one machine to another that is not 
having enough memory for this guest. The guest memory gets transferred 
but it fails to run so it's not running on either of those machines 
(i.e. domain is not on the destination nor source host machine).
I did try it with restore functionality now since I've been able to make 
it working for save once so I'm currently using one save image for the 
testing but unfortunately I'm having many issues with the common 
migration and save functionality since I've been able to make it working 
once to save it correctly. Fortunately the restores for this one 
particular save image is working fine. I was also thinking about 2 
concurrent migrations to the guest and/or save with the concurrent 
migration and it should be the issue (although it's not been tested 
because of reasons described above) since the domain gets created and 
it's available in the XendDomain list (i.e. xc.domain_getinfo() list) so 
it shouldn't be an issue here.
Michal

Signed-off-by: Michal Novotny <minovotn@xxxxxxxxxx>

--
Michal Novotny<minovotn@xxxxxxxxxx>, RHCE
Virtualization Team (xen userspace), Red Hat

Attachment: xen-fix-restore-handling-for-ide-drives-and-memory.patch
Description: Text Data

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