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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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  • 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).




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