Re: [Xen-devel] [PATCH 0/4] unsafe big.LITTLE support

[Julien Grall <julien.grall@xxxxxxx>]

On 15/02/18 23:16, Stefano Stabellini wrote:
> Hi all,
Hi Stefano,

> This series changes the initialization of two virtual registers to make
> sure they match the value of the underlying physical cpu.
>
> It also disables cpus different from the boot cpu, unless a newly
> introduced command line option is specified. In that case, it explains
> how to setup the system to avoid corruptions, which involves manually
> specifying the cpu affinity of all domains, because the scheduler still
> lacks big.LITTLE support.
On top of this series, I think we want to rework how we read the size of 
the cacheline. At the moment, we only read it on the boot CPU. But they 
may be different on each CPUs.
So I would replace that variable by reading the cacheline size everytime 
from system registers. This should quicker than trying to read the 
memory to know the cacheline size.
Note that I suggested this as a small tasks for Outreachy/GSOC.

Cheers,

--
Julien Grall

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