linux-kernel - Re: [PATCH v2] nvme: Add 48-bit DMA address quirk for Amazon NVMe controllers

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Message-ID: <20210210073759.GA23269@lst.de>
Date:   Wed, 10 Feb 2021 08:37:59 +0100
From:   Christoph Hellwig <hch@....de>
To:     Filippo Sironi <sironi@...zon.de>
Cc:     serebrin@...zon.com, dwmw@...zon.co.uk, benh@...zon.com,
        kbusch@...nel.org, axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] nvme: Add 48-bit DMA address quirk for Amazon NVMe
 controllers

On Wed, Feb 10, 2021 at 01:39:42AM +0100, Filippo Sironi wrote:
> Amazon NVMe controllers do not support 64-bit DMA addresses; they are
> limited to 48-bit DMA addresses.  Let's add a quirk to ensure that we
> make use of 48-bit DMA addresses to avoid misbehavior.

This should probably say some, and mention that they do not follow
the spec.  But I can fix this up when applying the patch.