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On QEMU: there is no region, so HMEM took ownership of the Soft Reserved range (REGISTER path). Patch 9 then reintroduced the Soft Reserved entry back into the iomem tree to reflect HMEM ownership. On physical setup: CXL fully claimed both ranges, region0 and region1 assembled successfully (DROP path). Since CXL owns the memory, there's no Soft Reserved parent to reintroduce. Soft Reserved appears in /proc/iomem only when CXL does not fully claim the range and HMEM takes over. Your physical setup is showing it correctly. Maybe CXL_REGION config is false or region assembly failed on and has cleaned up on QEMU so there aren't any regions? Thanks, Smita > > Tested-by: Tomasz Wolski