linux-kernel - Re: [PATCH] iommu/vt-d: Atomic breakdown of IOPT into finer granularity

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Message-ID: <ZNth+6SE3lHu+uce@nvidia.com>
Date:   Tue, 15 Aug 2023 08:31:07 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     季杰 <jijie.ji@...ux.alibaba.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Baolu Lu <baolu.lu@...ux.intel.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "xianting.tian@...ux.alibaba.com" <xianting.tian@...ux.alibaba.com>,
        "kaijieguo@...ux.alibaba.com" <kaijieguo@...ux.alibaba.com>,
        "daishengdong@...h.net" <daishengdong@...h.net>,
        "Zhao, Yan Y" <yan.y.zhao@...el.com>
Subject: Re: [PATCH] iommu/vt-d: Atomic breakdown of IOPT into finer
 granularity

On Tue, Aug 15, 2023 at 02:41:24PM +0800, 季杰 wrote:

> We do not incorporate iommufd in our cloud infrastructure, and use classic
> vfio and iommu driver. Cloud vendor like Aliyun may use its own IOPF handler
> software, so we want this patch to be a generic fix in iommu layer, suitable
> for both iommufd and vendor-specific software.

There will not be support for any advanced features in legacy
vfio. All new things will be in iommufd only.

Jason