linux-kernel - Re: [PATCH RFC v2 01/11] iommu: Add pasid_bits field in struct dev

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Date:   Wed, 30 Mar 2022 19:58:57 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     baolu.lu@...ux.intel.com, Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...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 RFC v2 01/11] iommu: Add pasid_bits field in struct
 dev_iommu

On 2022/3/30 15:05, Tian, Kevin wrote:
>> From: Lu Baolu<baolu.lu@...ux.intel.com>
>> Sent: Tuesday, March 29, 2022 1:38 PM
>>
>> Use this field to save the pasid/ssid bits that a device is able to
>> support with its IOMMU hardware. It is a generic attribute of a device
>> and lifting it into the per-device dev_iommu struct makes it possible
>> to allocate a PASID for device without calls into the IOMMU drivers.
>> Any iommu driver which suports PASID related features should set this
>> field before features are enabled on the devices.
> Miss a clarification for non-PCI SVA as discussed here:
> 
> https://lore.kernel.org/all/85d61ad6-0cf0-ac65-3312-32d0cdeb1b27@linux.intel.com/

Yes. Thanks for the reminding.

Best regards,
baolu