linux-kernel - Re: [PATCH] nvme: Add 48-bit DMA address quirk

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Message-ID: <20210203095148.GA8897@lst.de>
Date:   Wed, 3 Feb 2021 10:51:48 +0100
From:   Christoph Hellwig <hch@....de>
To:     Filippo Sironi <sironi@...zon.de>
Cc:     serebrin@...zon.com, dwmw@...zon.co.uk, kbusch@...nel.org,
        axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvme: Add 48-bit DMA address quirk

On Wed, Feb 03, 2021 at 10:43:38AM +0100, Filippo Sironi wrote:
> Certain NVMe controllers don't support 64-bit DMA addresses.  Instead,
> they are limited to 48-bit DMA addresses.  Let's add a quirk to use them
> properly.

WTF?  This is such a grave NVMe spec compiance bug that I do not think
we should support this buggy mess in Linux.