linux-kernel - pci_p2pdma_add_resource of bar memory rejected by memory hotplug as out of range

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Message-ID:
 <SJ2PR19MB8094482894628FF87E806CC8A4CB2@SJ2PR19MB8094.namprd19.prod.outlook.com>
Date: Wed, 5 Mar 2025 20:25:55 +0000
From: Kit Chow <kchow@...linear.com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: pci_p2pdma_add_resource of bar memory rejected by memory hotplug as
 out of range

Hello,

I am getting the following failure when I call pci_p2pdma_add_resource() with a valid bar memory address range:

[65246.333251] Hotplug memory [0x202ffc000000-0x202ffdc00000] exceeds maximum addressable range [0x0-0xaffffffffff]

I see this failure in 6.8.0.51-generic and 6.8.0.54-generic. This was not an issue in earlier 6.8 and 5.15 kernels.  

fwiw, I also get this failure with with 6.13.5-061305-generic.

Do you know what might be causing the schrinkage in the memory hot plug range?  And is there a workaround for this?

Thank you,
Kit