Re: [Xen-devel] [PATCH 4/4] xen/arm: arm64: Remove MPIDR multiprocessing extensions check

[Julien Grall <julien.grall@xxxxxxx>]

Hello Peng,

On 25/05/16 13:37, Peng Fan wrote:
> On Wed, May 25, 2016 at 10:10:11AM +0800, Wei Chen wrote:
> > In ARM64, the MPIDR multiprocessing extensions bit is reserved to 1.
> > So, the value check for this bit is no longer necessary on ARM64.
>  From ARM DDI0487A.G, I found the U bit for MPIDR_EL1:
> "
> Indicates a Uniprocessor system, as distinct from PE 0 in a multiprocessor 
> system. The possible
> values of this bit are:
> 0 Processor is part of a multiprocessor system.
> 1 Processor is part of a uniprocessor system.
> "
>
> It's not reserved to 1. Which doc are you refering to?
Please read carefully the patch. The check on MPDIR_EL1.U is kept, only 
the check to the RES1 bit ('M' for Aarch32) is removed.
Regards,

--
Julien Grall

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