linux-kernel - Re: [PATCH v3 00/10] Add Intel VT-d nested translation

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Message-ID: <ZHYnkckYAHI3EA/6@nvidia.com>
Date:   Tue, 30 May 2023 13:42:57 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "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>,
        "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>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>
Subject: Re: [PATCH v3 00/10] Add Intel VT-d nested translation

On Mon, May 29, 2023 at 06:16:44PM -0600, Alex Williamson wrote:
> On Mon, 29 May 2023 15:43:02 -0300
> Jason Gunthorpe <jgg@...dia.com> wrote:
> 
> > On Wed, May 24, 2023 at 08:59:43AM +0000, Tian, Kevin wrote:
> > 
> > > At least this looks a reasonable tradeoff to some proprietary VMMs
> > > which never adds RO mappings in stage-2 today.  
> > 
> > What is the reason for the RO anyhow?
> > 
> > Would it be so bad if it was DMA mapped as RW due to the errata?
> 
> What if it's the zero page?  Thanks,

GUP doesn't return the zero page if FOL_WRITE is specified

Jason