Re: [PATCH] add count-only option to DOM0_GETDOMAININFOLIST hypercall

["Mike D. Day" <ncmike@us.ibm.com>]

Anthony Liguori wrote:
> There's a race condition here.  There's no way of knowing that domains 
> haven't been destroyed (or created) in between these calls.
> 
> Unfortunately, the only way to avoid this is grab them one at a time.

The race condition is harmless and the patch is an improvement over the 
current situation where you have to guess the number of domains (and 
hence the size of the buffer you allocate).

Most of the time the caller will be looking for a snapshot of domain 
information, not an up-to-the-instant comprehensive report.

And the pre-existing method of allocating a huge buffer and calling once 
still works.

Mike