linux-kernel - Re: [PATCH v4 06/12] iommu/vt-d: Add second level page table interface

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Message-ID: <e987773c-a547-01e4-a04f-1f34506420ac@linux.intel.com>
Date:   Thu, 8 Nov 2018 10:27:58 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     "Liu, Yi L" <yi.l.liu@...el.com>, Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     baolu.lu@...ux.intel.com, "Raj, Ashok" <ashok.raj@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Sun, Yi Y" <yi.y.sun@...el.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH v4 06/12] iommu/vt-d: Add second level page table
 interface

Hi,

On 11/7/18 3:13 PM, Liu, Yi L wrote:
> Hi Baolu,
> 
>> From: Lu Baolu [mailto:baolu.lu@...ux.intel.com]
>> Sent: Monday, November 5, 2018 1:32 PM
>>
>> This adds the interfaces to setup or tear down the structures
>> for second level page table translations. This includes types
>> of second level only translation and pass through.
> 
> A little bit refining to the description:)
> "This patch adds interfaces for setup or tear down second level
> translation in PASID granularity. Translation type includes second
> level only type and pass-through type."
> 
>> Cc: Ashok Raj <ashok.raj@...el.com>
>> Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
>> Cc: Kevin Tian <kevin.tian@...el.com>
>> Cc: Liu Yi L <yi.l.liu@...el.com>
>> Signed-off-by: Sanjay Kumar <sanjay.k.kumar@...el.com>
> 
> [...]
> 
>> +
>> +void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
>> +				 struct device *dev, int pasid)
>> +{
>> +	struct pasid_entry *pte;
> 
> pte is confusing as it is similar with pte in paging structures. may use
> pt_entry or just pasid_entry. This comment applies to other "pte"s in
> this patch.

"pte" in this file means "pasid table entry", not "page table entry".
This file holds code to handle pasid table related staff. It has nothing
to do with paging structure. I think there should be no confusion here.
:-)

Best regards,
Lu Baolu