linux-kernel - Re: [PATCH 2/6] iommu/vt-d: Implement hw

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Date:   Sat, 11 Feb 2023 11:45:44 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>
Cc:     baolu.lu@...ux.intel.com, "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "nicolinc@...dia.com" <nicolinc@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "yi.y.sun@...ux.intel.com" <yi.y.sun@...ux.intel.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 2/6] iommu/vt-d: Implement hw_info for iommu capability
 query

On 2023/2/10 15:32, Tian, Kevin wrote:
>> From: Liu, Yi L <yi.l.liu@...el.com>
>> Sent: Thursday, February 9, 2023 12:17 PM
>>
>> From: Lu Baolu <baolu.lu@...ux.intel.com>
>>
>> To support nested translation in the userspace, it should check the
>> underlying hardware information for the capabilities.
> 
> remove this sentence. that belongs to next patch.
> 
>> +
>> +/**
>> + * struct iommu_device_info_vtd - Intel VT-d device info
>> + *
>> + * @flags: Must be set to 0
>> + * @__reserved: Must be 0
>> + * @cap_reg: Value of Intel VT-d capability register defined in chapter
>> + *	     11.4.2 of Intel VT-d spec.
>> + * @ecap_reg: Value of Intel VT-d capability register defined in chapter
>> + *	     11.4.3 of Intel VT-d spec.
> 
> let's be specific with section name e.g. "11.4.2 Capability Register" so if
> the chapter index is changed later people can still know where to look
> at.
> 
>> + *
>> + * Intel hardware iommu capability.
> 
> duplicated with the first line "Intel VT-d device info"

Above all agreed.

Best regards,
baolu