Re: [PATCH v6 0/9] dax/hmem, cxl: Coordinate Soft Reserved handling with CXL and HMEM

Alison Schofield
2026-02-12T21:18:46Z

On Thu, Feb 12, 2026 at 03:44:15PM +0100, Tomasz Wolski wrote:
> >
> >FYI - I am able to confirm the dax regions are back for no-soft-reserved
> >case, and my basic hotplug flow works with v6.
> >
> >-- Alison
>
> Hello Alison,
>
> I wanted to ask about this scenario.
> Is my understanding correct that this fix is needed for cases without Soft Reserve and:
> 1) CXL memory is installed in the server (no hotplug) and OS is started
> 2) CXL memory is hot-plugged after the OS starts
> 3) Tests with cxl-test driver
or QEMU

>
> In such case either the admin fails to manually create region via cxl cli (if there
> was no auto-regions) or regions fails to be created automatically during driver probe

The CXL region creates 'OK'. It is the DAX region that is not created.

>
> Is this correct?
>
> Best regards,
> Tomasz