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

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Message-ID: <8a375a50-1aad-96c5-2743-f91120fbc6f9@amazon.de>
Date:   Wed, 10 Feb 2021 10:13:17 +0100
From:   Filippo Sironi <sironi@...zon.de>
To:     Christoph Hellwig <hch@....de>
CC:     <serebrin@...zon.com>, <dwmw@...zon.co.uk>, <benh@...zon.com>,
        <kbusch@...nel.org>, <axboe@...com>, <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 2/10/21 8:37 AM, Christoph Hellwig wrote:
> 
> 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.
> 

Thanks!

Filippo



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