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

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Date:   Mon, 11 Nov 2019 09:05:20 -0500
From:   Qian Cai <cai@....pw>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     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



> 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.