AW: Re: __setup_cpu_be problem

[Jimi Xenidis]

It is important we consider the cases where the hypervisor is present  
and not present.
There is also the problem of different Hypervisors.
I do not think FW without Hypervisor has any  business choosing the  
page sizes for an OS.
For Hypervisor machines, as discussed below, it needs to be negotiated.
There are plenty of things that need to be negotiated like this, and  
it is likely that each hypervisor will do this differently.

I guess for Hypervisors we'll wait and see.
-JX

On Feb 14, 2006, at 5:31 PM, Hollis Blanchard wrote:

> On Tue, 2006-02-14 at 10:22 -0800, Geoff Levand wrote:
>>
>> Sorry about changing my mind on this Ben, but after reading the  
>> Book 4
>> docs on page sizes I see that each partition can have independent
>> page size settings.  I made the wrong assumption that all partitions
>> needed the same size setting.  Based on this, and on Arnd's comments,
>> I think in general we will need to setup page sizes in the kernel.
>
> On Tue, 2006-02-14 at 15:27 -0600, Olof Johansson wrote:
>>
>> Isn't this something that should be configured in the hypervisor /
>> partition firmware on the machine then, instead of hacked into the
>> kernel? The hypervisor would of course switch HID contents when
>> dispatching different partitions, if needed.
>
> I agree with Olof; I don't follow the original leap of logic.
>
> If every partition can have independent page size settings, and
> especially if HID6 is a hypervisor-privileged resource as mentioned
> earlier, then the hypervisor needs to set it. Only the hypervisor can
> restore each partition's different HID6 value when it switches between
> them...
>
> -Hollis
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