Re: [Qemu-devel] [PATCH 2/2] PPC: Cuda: Use cuda timer to expose tbfreq to guest

[Mark Cave-Ayland]

On 13/07/14 21:36, Alexander Graf wrote:

> Mac OS X calibrates a number of frequencies on bootup based on reading
> tb values on bootup and comparing them to via cuda timer values.
>
> The only variable we can really steer well (thanks to KVM) is the cuda
> frequency. So let's use that one to fake Mac OS X into believing the
> bus frequency is tbfreq * 4. That way Mac OS X will automatically
> calculate the correct timebase frequency.
>
> With this patch and the patch set I posted earlier I can successfully
> run Mac OS X 10.2, 10.3 and 10.4 guests with -M mac99 on TCG and KVM.

Fantastic! I thought you mentioned before that there was a problem with 
the way in which OS X used the MMU which meant it wouldn't be possible 
to run under KVM but I guess that has been fixed now?

Also do any of these changes help any of the *BSDs to boot further?


ATB,

Mark.