linux-kernel - Re: [PATCH v2 0/7] iommu/vt-d: Add page request draining support

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Message-ID: <86b04dae-ff11-fc4b-551a-17c0ce352843@linux.intel.com>
Date:   Wed, 15 Apr 2020 16:25:56 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     baolu.lu@...ux.intel.com, "Raj, Ashok" <ashok.raj@...el.com>,
        "jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/7] iommu/vt-d: Add page request draining support

Hi Kevin,

On 2020/4/15 15:57, Tian, Kevin wrote:
>> From: Lu Baolu<baolu.lu@...ux.intel.com>
>> Sent: Wednesday, April 15, 2020 1:26 PM
>>
>> When a PASID is stopped or terminated, there can be pending PRQs
>> (requests that haven't received responses) in the software and
>> remapping hardware. The pending page requests must be drained
>> so that the pasid could be reused. The register level interface
>> for page request draining is defined in 7.11 of the VT-d spec.
>> This series adds the support for page requests draining.
> 7.11 doesn't include register-level interface. It just talks about
> the general requirements on system software, endpoint device
> and its driver.
> 

I will replace this with "spec 7.10 specifies the software steps to
drain page requests and response".

Best regards,
baolu