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Re: Hand over of the Xen shared info page

On 14/05/2021 10:50, Anastasiia Lukianenko wrote:
Hi Julien!


On Thu, 2021-05-13 at 09:37 +0100, Julien Grall wrote:

On 13/05/2021 09:03, Anastasiia Lukianenko wrote:
The alternative is for U-boot to go through the DT and infer which
regions are free (IOW any region not described).

Thank you for interest in the problem and advice on how to solve it.
Could you please clarify how we could find free regions using DT in U-

I don't know U-boot code, so I can't tell whether what I suggest would work.

In theory, the device-tree should described every region allocated in address space. So if you parse the device-tree and create a list (or any datastructure) with the regions, then any range not present in the list would be free region you could use.

However, I realized a few days ago that the magic pages are not described in the DT. We probably want to fix it by marking the page as "reserved" or create a specific bindings.

So you will need a specific quirk for them.

I have posted some more idea a separate thread [1] related to FreeBSD support for Arm.


[1] https://lore.kernel.org/xen-devel/f7360dac-5d83-733b-7ec5-c73d4dc0350d@xxxxxxx/

Julien Grall



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