[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] Odroid XU3 support


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:

        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.


Julien Grall

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.