Re: [Xen-devel] [PATCH V3 1/1] expand x86 arch_shared_info to support >3 level p2m tree

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 15.09.14 at 12:46, <JGross@xxxxxxxx> wrote:
> On 09/15/2014 12:30 PM, David Vrabel wrote:
>> With the exception of VMs that have assigned direct access to hardware,
>> migration is an essential feature and must be supported.
> 
> So you'd prefer:
> 
> 1) >512GB pv-domains (including Dom0) will be supported only with new
>     Xen (4.6?), no matter if the user requires migration to be supported
> 
> to:
> 
> 2) >512GB pv-domains (especially Dom0 and VMs with direct hw access) can
>     be started on current Xen versions, migration is possible only if Xen
>     is new (4.6?)
> 
> What is the common use case for migration? I doubt it is used very often
> for really huge domains.

Even without any guessing on the likelihood and usefulness of huge
domains getting migrated, 1) clearly causing more functionality
reduction than 2) I'm having a hard time seeing why 1) would be
favored by anyone outside of academical/theoretical considerations.

Jan


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