Re: [PATCH] xen/arm64: Default ACPI support enabled

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

+George

On Mon, 6 Feb 2023, Julien Grall wrote:
> On 06/02/2023 20:30, Elliott Mitchell wrote:
> > The situation is changing in large entities are pushing ACPI for ARM.  If
> > they succeed (likely) then it will be a case of Xen/ARM MUST support
> > ACPI, or else the project will die. 

We need to be careful when making wide-reaching marketing statements because:
- it is always extremely hard to make accurate prediction of the future
- even seasoned experts often make major guessing mistakes

Bill Gates predicted that OS/2 would take over the world in '87. Many
people on xen-devel might not even know what OS/2 is.

I am not aware of any plans by Xilinx (now AMD) to replace Device Tree
with ACPI. In fact we are investing in Device Tree with System Device
Tree and other related activites (Lopper, etc.)


I suggest to keep the discussion technical and practical. As a
community, we don't enable experimental/unsupported features by default
for obvious reasons. In this case, the feature (ACPI) might give a
chance to Xen to boot on a given platform.

Do we want to make an exception for ACPI to be enabled by default even
if experimental/unsupported? If so, we can look into the details of how
to do that.

But first, we need a policy decision. Who should be the people making
this decision? I'll let George as Community Manager decide if the
decision stands with the ARM maintainers or with the committers.