linux-kernel - Re: [PATCH 2/3] iommu/vt-d: Parse SATC reporting structure

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Message-ID: <28583efc-1a3a-a863-fb68-cfe3afa9d68a@linux.intel.com>
Date:   Wed, 3 Feb 2021 08:29:57 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     "Raj, Ashok" <ashok.raj@...el.com>
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux-foundation.org,
        Yian Chen <yian.chen@...el.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] iommu/vt-d: Parse SATC reporting structure

Hi Ashok,

On 2/3/21 12:41 AM, Raj, Ashok wrote:
> On Tue, Feb 02, 2021 at 12:40:56PM +0800, Lu Baolu wrote:
>> From: Yian Chen <yian.chen@...el.com>
>>
>> Software should parse every SATC table and all devices in the tables
>> reported by the BIOS and keep the information in kernel list for further
>> SATC policy deployment.
>>
> The last part seems bit vague? Are you trying to imply,
> 
> if kernel is booted with noats for instance, a device listed in SATC table
> as "requires ATS" will fail to load?
> 
> Otherwise its not clear what the policy enforcement means.
> 

Yes. This is a bit vague. The ATS policy is out of the purpose of this
patch. It only parses the table and keep the device list for further
reference.

Best regards,
baolu