linux-kernel - RE: [RFC 01/13] iommu: Introduce bind_guest

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Date:   Tue, 4 Sep 2018 07:57:50 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Auger Eric <eric.auger@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        "eric.auger.pro@...il.com" <eric.auger.pro@...il.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
        "yi.l.liu@...ux.intel.com" <yi.l.liu@...ux.intel.com>,
        "will.deacon@....com" <will.deacon@....com>,
        "robin.murphy@....com" <robin.murphy@....com>
CC:     "marc.zyngier@....com" <marc.zyngier@....com>,
        "peter.maydell@...aro.org" <peter.maydell@...aro.org>,
        "christoffer.dall@....com" <christoffer.dall@....com>
Subject: RE: [RFC 01/13] iommu: Introduce bind_guest_stage API

> From: Auger Eric
> Sent: Friday, August 31, 2018 9:52 PM
> 
> Hi Jean-Philippe,
> 
> On 08/31/2018 03:11 PM, Jean-Philippe Brucker wrote:
> > Hi Eric,
> >
> > On 23/08/18 16:25, Auger Eric wrote:
> >>> +int iommu_bind_guest_stage(struct iommu_domain *domain, struct
> device *dev,
> >>> +			   struct iommu_guest_stage_config *cfg)
> >
> > About the name change from iommu_bind_pasid_table: is the intent to
> > reuse this API for SMMUv2, which supports nested but not PASID? Seems
> > like a good idea but "iommu_bind_table" may be better since "stage" is
> > only used by Arm.
> 
> At the moment I don't target SMUv2 but just SMMUv3. My focus was on
> nested stage enablement without enabling the multi-CD feature (PASID),
> whish is not supported by the QEMU vSMMUv3. Afterwards I realized that
> basically we are pointing to a CD or PASID table and that's about the
> same. I don't have a strong opinion on the name, iommu_bind_guest_table
> or iommu_bind_pasid_table would be fine with me. Indeed "stage" is ARM
> vocable (level for Intel?)

Intel uses first level/second level. 

iommu_bind_table is a bit confusing. what should people take table as?
there is PASID table. there is also page table linked in each stage/level. and
maybe other tables in vendor-specific definition.

to me iommu_bind_pasid_table is still clearer. anyway in other places
we've used pasid explicitly in vfio/iommu APIs, then it should be general
enough to represent various implementations.

Thanks
Kevin