[PATCH 21/26] KVM: PPC: Force enable nap on KVM

[Alexander Graf]

On 17.08.2010, at 20:28, Scott Wood wrote:

> On Tue, 17 Aug 2010 15:57:56 +0200
> Alexander Graf <agraf at suse.de> wrote:
> 
>> There are some heuristics in the PPC power management code that try to find
>> out if the particular hardware we're running on supports proper power management
>> or just hangs the machine when going into nap mode.
>> 
>> Since we know that KVM is safe with nap, let's force enable it in the PV code
>> once we're certain that we are on a KVM VM.
> 
> Could this cause the cache to be flushed unnecessarily on e500?  Where
> available, doze would probably be better for signalling the hypervisor
> that the guest is idle.

You're right - this should be #ifdef'ed on Book3s. I'll add that as a patch on top, as Qemu on BookE doesn't expose KVM capabilities yet.


Alex