Re: [Xen-devel] Odroid XU3 support

[Julien Grall <julien.grall@xxxxxxx>]

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 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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