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

Tomasz Wolski
2026-02-20T09:45:25Z

Tested on QEMU and physical setups.

I have one question about "Soft Reserve" parent entries in iomem.
On QEMU I see parent "Soft Reserved":

a90000000-b4fffffff : Soft Reserved
a90000000-b4fffffff : CXL Window 0
a90000000-b4fffffff : dax1.0
a90000000-b4fffffff : System RAM (kmem)

While on my physical setup this is missing - not sure if this is okay?

BIOS-e820: [mem 0x0000002070000000-0x000000a06fffffff] soft reserved

2070000000-606fffffff : CXL Window 0
2070000000-606fffffff : region0
2070000000-606fffffff : dax0.0
2070000000-606fffffff : System RAM (kmem)
6070000000-a06fffffff : CXL Window 1
6070000000-a06fffffff : region1
6070000000-a06fffffff : dax1.0
6070000000-a06fffffff : System RAM (kmem)

Tested-by: Tomasz Wolski <tomasz.wolski@fujitsu.com>