linux-kernel - RE: [PATCH v4 15/32] vfio: introduce KVM-owned IOMMU type

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Message-ID: <BN9PR11MB52762F1B395D27B1F82BBF0F8C139@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Fri, 18 Mar 2022 07:01:19 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "schnelle@...ux.ibm.com" <schnelle@...ux.ibm.com>,
        "farman@...ux.ibm.com" <farman@...ux.ibm.com>,
        "pmorel@...ux.ibm.com" <pmorel@...ux.ibm.com>,
        "borntraeger@...ux.ibm.com" <borntraeger@...ux.ibm.com>,
        "hca@...ux.ibm.com" <hca@...ux.ibm.com>,
        "gor@...ux.ibm.com" <gor@...ux.ibm.com>,
        "gerald.schaefer@...ux.ibm.com" <gerald.schaefer@...ux.ibm.com>,
        "agordeev@...ux.ibm.com" <agordeev@...ux.ibm.com>,
        "svens@...ux.ibm.com" <svens@...ux.ibm.com>,
        "frankja@...ux.ibm.com" <frankja@...ux.ibm.com>,
        "david@...hat.com" <david@...hat.com>,
        "imbrenda@...ux.ibm.com" <imbrenda@...ux.ibm.com>,
        "vneethv@...ux.ibm.com" <vneethv@...ux.ibm.com>,
        "oberpar@...ux.ibm.com" <oberpar@...ux.ibm.com>,
        "freude@...ux.ibm.com" <freude@...ux.ibm.com>,
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        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "corbet@....net" <corbet@....net>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: RE: [PATCH v4 15/32] vfio: introduce KVM-owned IOMMU type

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Tuesday, March 15, 2022 10:55 PM
> 
> The first level iommu_domain has the 'type1' map and unmap and pins
> the pages. This is the 1:1 map with the GPA and ends up pinning all
> guest memory because the point is you don't want to take a memory pin
> on your performance path
> 
> The second level iommu_domain points to a single IO page table in GPA
> and is created/destroyed whenever the guest traps to the hypervisor to
> manipulate the anchor (ie the GPA of the guest IO page table).
> 

Can we use consistent terms as used in iommufd and hardware, i.e.
with first-level/stage-1 referring to the child (GIOVA->GPA) which is
further nested on second-level/stage-2 as the parent (GPA->HPA)?

Otherwise all other explanations are agreed.

Thanks
Kevin