Re: [Xen-devel] Odroid XU3 support

[Peng Fan <van.freenix@xxxxxxxxx>]

Hi Julien,

On Thu, Apr 28, 2016 at 10:50:33AM +0100, Julien Grall wrote:
>Hello,
>
>On 27/04/16 23:53, Suriyan Ramasami wrote:
>
>>        How can I check which core is currently active?
>>        Judging by this link on big.LITTLE architecture:
>>        http://forum.odroid.com/viewtopic.php?f=65&t=2580
>>
>>        result of: cat /proc/cpuinfo | grep "CPU part" is
>>        CPU part    : 0xc07
>>
>>        which stands for A7.
>>
>>If you do this in dom0, it will show all of them to be 0xc07. They are
>>vCPUs after all.
>
>Which is not a good idea. This means that Linux is not able to detect
>potential errata for the underlying cores (in this case the cortex-A15). Also
>some userspace may do some runtime optimization based on the kind of CPUs
>available in the guest.
>
>Xen is not ready for big.LITTLE, so I would highly recommend you to disable
>either all the Cortex-A15 or Cortex-A7.

For Cortex A53 + A72 or A53 + A57, xen also not ready?

If need to let xen support A53 + A72 or A53 + A57, what work may need to be 
done?

Thanks,
Peng
>
>For your information, I am planning to send a patch to park any CPUs whose
>MIDR is not matching the boot CPU one.
>
>Regards,
>
>-- 
>Julien Grall
>
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