[PATCH 13/26] KVM: PPC: Add feature bitmap for magic page

[Alexander Graf]

On 22.08.2010, at 18:42, Avi Kivity wrote:

> On 08/17/2010 04:57 PM, Alexander Graf wrote:
>> We will soon add SR PV support to the shared page, so we need some
>> infrastructure that allows the guest to query for features KVM exports.
>> 
>> This patch adds a second return value to the magic mapping that
>> indicated to the guest which features are available.
>> 
> 
> You need to make that feature controllable from userspace, to allow new->old save/restore.

Good one :). We're still missing too much stuff to even run without losing interrupts yet and you're thinking about new->old save/restore. Who'd want to migrate onto a system that's broken anyways? Besides - we're missing too many register values from the kernel side to even be able to perform a migration.

I'm planning to add migration, probably after SMP. But that will be another CAP and anything before that won't be able to save/restore.


Alex