linux-kernel - Re: [PATCH 0/2] Misc fixes on registering PCI NVMe CMB

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Message-ID: <Z70Nw_RQ5C1sHiCV@kbusch-mbp>
Date: Mon, 24 Feb 2025 17:24:35 -0700
From: Keith Busch <kbusch@...nel.org>
To: Icenowy Zheng <uwu@...nowy.me>
Cc: Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>, linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Misc fixes on registering PCI NVMe CMB

On Thu, Feb 13, 2025 at 01:04:42AM +0800, Icenowy Zheng wrote:
> Here is a small patchset that is developed during my investigation of
> a WARNING in my boot kernel log (AMD EPYC 7K62 CPU + Intel DC D4502
> SSD), which is because of the SSD's too-small CMB block (512KB only).
> 
> The first patch is a fix of the PCI DMA registration error handling
> codepath, which is just a observation-based patch (because my disk is
> only NVMe 1.2 compliant, and the register cleaned up here is only added
> in NVMe 1.4).
> 
> The second patch really fixes the warning by testing the CMB block
> against the memory hotplugging alignment requirement (which the CMB
> block of my SSD surely cannot satisfy -- the alignment requirement is
> usually 2M with SPAREMEM_VMEMMAP enabled and even larger in other cases).

Applied to nvme-6.14 with the suggested changes in patch 2 folded in.