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Re: [PATCH v2 13/13] SUPPORT.md: write down restriction of 32-bit tool stacks
- To: Julien Grall <julien@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 15 Jul 2021 08:38:28 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 15 Jul 2021 06:38:40 +0000
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On 14.07.2021 20:16, Julien Grall wrote:
> On 05/07/2021 16:18, Jan Beulich wrote:
>> Let's try to avoid giving the impression that 32-bit tool stacks are as
>> capable as 64-bit ones.
>
> Would you be able to provide a few examples of the known issues in the
> commit message? This would be helpful for anyone to understand why we
> decided to drop the support.
Not sure how useful this is going to be. This would be pointing at the
declarations / definitions of various tool stack internal variables or
structure fields. Which also is why ...
> At least on Arm, we tried to design the hypercall ABI in such a way that
> it should be possible to use a 32-bit toolstack.
... keeping the ABI tidy in this regard didn't help at all (albeit it
of course was a prereq to writing a tool stack that would be capable).
Jan
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