Re: [PATCH RFC 0/N] xen: arm: rework early bring up

[Julien Grall <julien.grall@linaro.org>]

On 09/17/2013 02:37 AM, Ian Campbell wrote:
> Hi,
> 
> The following reworks early bring up on ARM to use a separate set of
> boot pagetables. This simplifies things by avoiding the need to bring up
> all CPUs in lock step, which in turn allows us to do secondary CPU
> bringup in C code.
> 
> Unfortunately the main bulk of this change is a single large patch which
> is hard to decompose any further since it is basically pulling on the
> thread and then knitting a new jumper from it.
> 
> With these changes Xen now absolutely requires that the bootloader calls
> the hypervisor in HYP mode, the previous workarounds have been removed.
> For use on models a bootwrapper is now required. See 
>         git://xenbits.xen.org/people/ianc/boot-wrapper.git xen-arm32
>         git://xenbits.xen.org/people/ianc/boot-wrapper-aarch64.git xen-arm64
> 
> I have implemented support for CPU bringup on the fastmodel vexpress
> platforms (v7and v8) here, I suppose it should work OK on a real
> vexpress too but I've not tried it.

I have just tried the patch series on the versatile express and it
doesn't work. I'm using the u-boot from Andre and all the cpus already
boot in hyp mode (checked without this patch series).

Xen log here: http://pastebin.com/eJ21dqRm

Andre, do you know if we need a specific kick cpus for the versatile
express and your hyp mode patch series?

-- 
Julien Grall