linux-kernel - Re: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains

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Message-ID: <20231023135935.GW3952@nvidia.com>
Date:   Mon, 23 Oct 2023 10:59:35 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Nicolin Chen <nicolinc@...dia.com>
Cc:     "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>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.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>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>,
        "Martins, Joao" <joao.m.martins@...cle.com>
Subject: Re: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on
 kernel-managed domains

On Sun, Oct 22, 2023 at 05:18:03PM -0700, Nicolin Chen wrote:

> > > And where should we add this comment? Kdoc of
> > > the alloc uAPI?
> > 
> > Maybe right in front of the only enforce_cc op callback?
> 
> OK. How about this? Might be a bit verbose though:
> 	/*
> 	 * enforce_cache_coherenc must be determined during the HWPT allocation.
> 	 * Note that a HWPT (non-CC) created for a device (non-CC) can be later
> 	 * reused by another device (either non-CC or CC). However, A HWPT (CC)
> 	 * created for a device (CC) cannot be reused by another device (non-CC)
> 	 * but only devices (CC). Instead user space in this case would need to
> 	 * allocate a separate HWPT (non-CC).
> 	 */

Ok, fix the spello in enforce_cache_coherenc

Jason