linux-kernel - Re: [PATCH v2 1/1] iommu/vt-d: Add Kconfig option to enable/disable scalable mode

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Message-ID: <fefea7dd-8cde-889d-0883-7d94b8d85f20@linux.intel.com>
Date:   Tue, 12 Nov 2019 13:48:12 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Qian Cai <cai@....pw>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>, kevin.tian@...el.com,
        ashok.raj@...el.com, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, jacob.jun.pan@...el.com
Subject: Re: [PATCH v2 1/1] iommu/vt-d: Add Kconfig option to enable/disable
 scalable mode

Hi,

On 11/11/19 10:05 PM, Qian Cai wrote:
> 
> 
>> On Nov 11, 2019, at 12:23 AM, Lu Baolu <baolu.lu@...ux.intel.com> wrote:
>>
>> The scalable mode is defined in VT-d 3.0. The scalable mode capability
>> could be checked by reading /sys/devices/virtual/iommu/dmar*/intel-
>> iommu/ecap. It's currently not friendly for reading. You need to decode
>> it according to the spec.
> 
> This looks like some perfect information to put in the Kconfig description.
> 

Okay. Will add it in the next version.

Best regards,
baolu