Hi Oleksandr,
Hi, Julien
There is a question which worries me and likely other people as well.
Which is "reserved memory area support in Xen". Some SoCs except
application processors have some IPs (co-processors, dsps, codecs,
whatever) which rely on a specific predefined memory regions, or even
can work with these memory regions only...
This discussion came-up time to time on the ML. I would love to see
patches we can discuss :)
Without this feature being supported, we won't be able to use IPs,
whose firmware requires a predefined memory region to talk to an
application processor, I am afraid.
One option comes to mind... I presume, the use of "iomem" property in
domain config could allow us to assign 1:1 mapped region to that
guest domain. Would it be a correct option?
What needs to be implementing it Xen, for example, to have a
possibility to assign a particular reserved memory region(s) to a
particular guest domain?
Well, for a first you need to deal with Xen and Dom0. For instance,
Xen allocator should not be able to use that memory for a normal RAM
page.
I understand.
There was some discussions on the ML a long time ago with Andrii (see
[1]). Maybe he has some patches ready for it.
Cheers,
[1]
https://lists.xenproject.org/archives/html/xen-devel/2017-07/msg02674.html
Thank you for the pointer. I will read it.
--
Regards,
Oleksandr Tyshchenko
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