Re: [PATCH 2/2] cxl/region: Unregister auto-created region when assembly fails

[Alison Schofield <alison.schofield@intel.com>]

On Sat, Jan 31, 2026 at 10:49:11AM -0500, Gregory Price wrote:
> On Fri, Jan 30, 2026 at 05:04:48PM -0800, Alison Schofield wrote:
> > 
> ... snip ...
> Logging in on a saturday, will respond fully on monday just wanted to
> inject a question for the masses here
> 
> > When auto-created region assembly fails, 
> 
> I wonder how many work we want to do to try to make the auto-region
> path more reliable for complex setups (interleaving being one example).
> 
> In other paths, in particular when there is some implied use-case for
> the device, we already take the opinion the BIOS should do nothing.
> Should we draw a hard line on when that should be the official opinion?
> 
> i.e. auto-decoders should be intended for trivial SysRAM regions only

It has not been my impression that we have that much control over what
BIOS may present. ie. If it is CXL Spec legal they may build it. I
recall you wrote a doc of Linux Expectations of BIOS. Did you actually
try to limit what BIOS does?


> 
> (especially given that a user can't even select zone-isolation except
>  via a global kernel build option that affects all hotplug memory)
> 
> ~Gregory