linux-kernel - Re: [PATCH v4 09/12] iommu/vt-d: Add iotlb flush for nested domain

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Date:   Wed, 9 Aug 2023 20:33:22 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     "Liu, Yi L" <yi.l.liu@...el.com>
CC:     Jason Gunthorpe <jgg@...dia.com>,
        "Tian, Kevin" <kevin.tian@...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>
Subject: Re: [PATCH v4 09/12] iommu/vt-d: Add iotlb flush for nested domain

On Thu, Aug 10, 2023 at 03:28:10AM +0000, Liu, Yi L wrote:

> > @Yi,
> > This seems to be a bigger rework than the top level struct. Along
> > with Jason's request for fail_nth below, we'd need to bisect the
> > workload between us, or can just continue each other's daily work.
> > Let me know which one you prefer.
> > https://lore.kernel.org/linux-iommu/ZNPCtPTcHvITt6fk@nvidia.com/
> 
> Let me address the fail_nth request first. You may rework the
> iommufd_get_user_data(). If I can finish the fail_nth soon,
> then may help to lift the array to the top level. If not, you
> may make it as well. 😊 I guess I need some study on nth
> as well.

Ack. Am working on the iommufd_get_user_data() already. Will
continue the ring buffer thing.

Nic