Re: [Xen-devel] [PATCH] xen/arm: Support kick cpus and switch to hypervisor for the OMAP5

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2013-08-15 at 11:03 +0100, Julien Grall wrote:
> I'm not in favor to extend this assembly file (see full explanation on
> Ian's mail 
> http://lists.xen.org/archives/html/xen-devel/2013-06/msg01231.html).
> 
> Some ideas to remove this file:
>    - Move kick cpus code later (ie in C code) and per platform
>    - Use U-boot or a bootwrapper to switch CPUs to HYP mode

Strangely enough I was just working on this bootwrapper stuff earlier in
the week (I just sent another mail about it). It's not there for the
kick cpu stuff yet but I have some ideas...

I expect we will actually want to do both of the things you suggest. If
the firmware does not leave secondary CPUs in a state where they can be
kicked from NS HYP mode or cause them to start in NS HYP then we will
need boot-wrapper to paper over this and make it look that way to Xen.

Then the kick cpus code in Xen can be moved later, hopefully as late as
the existing cpu_up code, although this might need some rejigging of how
we do the pagetable bootstrapping.

Ian.




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