linux-kernel - RE: [RFC v16 1/9] iommu: Introduce attach/detach_pasid

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Date:   Sat, 11 Dec 2021 05:18:04 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     "peter.maydell@...aro.org" <peter.maydell@...aro.org>,
        "lushenming@...wei.com" <lushenming@...wei.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        "maz@...nel.org" <maz@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "vsethi@...dia.com" <vsethi@...dia.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "wangxingang5@...wei.com" <wangxingang5@...wei.com>,
        "vivek.gautam@....com" <vivek.gautam@....com>,
        "zhangfei.gao@...aro.org" <zhangfei.gao@...aro.org>,
        "eric.auger.pro@...il.com" <eric.auger.pro@...il.com>,
        "will@...nel.org" <will@...nel.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>
Subject: RE: [RFC v16 1/9] iommu: Introduce attach/detach_pasid_table API

> From: Tian, Kevin
> Sent: Saturday, December 11, 2021 11:58 AM
>
> This might be the only open as I still didn't see why we need an
> explicit flag to claim a 'full device' thing. From kernel p.o.v the
> ARM case is no different from Intel that both allows an user
> page table attached to vRID, just with different format and

obviously this is 'RID' to not cause further confusion since it
talks about the kernel p.o.v

> addr width (Intel is 64bit, ARM is 84bit where PASID can be
> considered a sub-handle in the 84bit address space and not
> the kernel's business).
> 
> and ARM doesn't support explicit PASID attach then those calls
> will fail for sure.

Thanks
Kevin