Re: [Qemu-devel] [PATCH 03/23] PPC: Add CPU definitions for up to 32 guest CPUs

[Alexander Graf]

On 21.07.2011, at 18:46, Scott Wood wrote:

> On Thu, 21 Jul 2011 03:27:14 +0200
> Alexander Graf <address@hidden> wrote:
> 
>> All guest CPUs need to be specified in the device trees. Since removing nodes
>> is easy with FDT, but adding nodes is not, we just put 32 CPU nodes into the
>> device tree and remove them later on init when not used.
> 
> Adding nodes isn't that hard...

Hm. I'll check again and see if I can add a node. If so, we can just completely 
replace the CPU definitions by self-generated ones.

> I'm also hesitant to stick so many CPUs on something modeled after an
> e500v2-era mpc85xx.  E.g. in the MPIC the upper bits of xIDR are used
> for EP/CIx.  The newer MPIC used in p4080 and such move crit/mcheck routing
> into a separate register.  There are similar constraints in guts (power
> management), and possibly elsewhere.

Good point. See my other mail. I'll fix the CI thing and limit the # of CPUs.


Alex