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

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Message-Id: <472617D4-1652-45FB-90A4-0D45766DB78B@lca.pw>
Date:   Sun, 10 Nov 2019 21:58:56 -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 8, 2019, at 10:43 PM, Lu Baolu <baolu.lu@...ux.intel.com> wrote:
> 
> +config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
> +    prompt "Enable Intel IOMMU scalable mode by default"
> +    depends on INTEL_IOMMU
> +    help
> +      Selecting this option will enable the scalable mode if
> +      hardware presents the capability. If this option is not
> +      selected, scalable mode support could also be enabled
> +      by passing intel_iommu=sm_on to the kernel.
> +

Does it also make sense to mention which hardware presents this capability or how to check it?