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 10:17:25 +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 10:00 AM, Qian Cai wrote:
> 
> 
>> On Nov 10, 2019, at 8:30 PM, Lu Baolu <baolu.lu@...ux.intel.com> wrote:
>>
>> How about "pasid based multiple stages DMA translation"?
> 
> It is better but I am still not sure how developers should select it or not when asking. Ideally, should it mention pros and cons of this? At minimal, there should be a line said “if not sure what this is, select N”?
> 

Actually, I'd recommend "if not sure, use the default value". :-)

Best regards,
baolu