linux-kernel - Re: [PATCH v4 0/5] iommu/vt-d: Add page request draining support

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Date:   Thu, 7 May 2020 14:47:42 +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 v4 0/5] iommu/vt-d: Add page request draining support

Hi Kevin,

Thanks a lot for reviewing.

On 2020/5/7 14:38, Tian, Kevin wrote:
>> From: Lu Baolu<baolu.lu@...ux.intel.com>
>> Sent: Thursday, May 7, 2020 8:55 AM
>>
>> 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 chapter 7.10 in the VT-d
>> specification specifies the software steps to drain pending page
>> requests and responses.
>>
>> This includes two parts:
>>   - PATCH 1/4 ~ 2/4: refactor the qi_submit_sync() to support multiple
>>     descriptors per submission which will be used in the following
>>     patch.
>>   - PATCH 3/4 ~ 4/4: add page request drain support after a pasid entry
>>     is torn down.
>>
> I think you should mention that this series depends on Jacob's nested
> SVA series.
> 

Yes. It's based on Jacob's vSVA series since guest unbind also requires
prq draining.

Best regards,
baolu