From: Julien Grall <julien@xen.org>
To: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: Andrii Chepurnyi <Andrii_Chepurnyi@epam.com>,
Oleksandr Andrushchenko <Oleksandr_Andrushchenko@epam.com>,
Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: Hand over of the Xen shared info page
Date: Wed, 19 May 2021 21:19:23 +0100 [thread overview]
Message-ID: <8d1ecf6c-a0d1-d9bc-5daf-d02a34fff1e6@xen.org> (raw)
In-Reply-To: <1db54c363eae22613280e7181805abee396fe5e9.camel@epam.com>
On 14/05/2021 10:50, Anastasiia Lukianenko wrote:
> Hi Julien!
Hello,
> 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-
> boot?
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.
Cheers,
[1]
https://lore.kernel.org/xen-devel/f7360dac-5d83-733b-7ec5-c73d4dc0350d@xen.org/
--
Julien Grall
next prev parent reply other threads:[~2021-05-19 20:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-13 8:03 Hand over of the Xen shared info page Anastasiia Lukianenko
2021-05-13 8:28 ` Olaf Hering
2021-05-13 8:37 ` Julien Grall
2021-05-14 9:50 ` Anastasiia Lukianenko
2021-05-19 20:19 ` Julien Grall [this message]
2021-05-19 23:11 ` Stefano Stabellini
2021-05-20 5:21 ` Oleksandr Andrushchenko
2021-05-20 9:46 ` Julien Grall
2021-05-20 12:37 ` Oleksandr Andrushchenko
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