linux-kernel - RE: [PATCH v1 0/8] Add IO page table replacement support

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Message-ID: <BN9PR11MB527680F63EC5443DD7A5E98A8CD79@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Fri, 3 Feb 2023 08:09:30 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "shuah@...nel.org" <shuah@...nel.org>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
Subject: RE: [PATCH v1 0/8] Add IO page table replacement support

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Thursday, February 2, 2023 3:05 PM
> 
> QEMU with this feature should have the vIOMMU maintain a cache of the
> guest io page table addresses and assign a unique IOAS to each unique
> guest page table.

I didn't get why we impose such requirement to userspace.

> 
> To apply this series, please rebase on top of the following patches:
> 1) [PATCH 00/13] Add vfio_device cdev for iommufd support
>    https://lore.kernel.org/kvm/20230117134942.101112-1-yi.l.liu@intel.com/
> 2) (Merged) [PATCH v5 0/5] iommu: Retire detach_dev callback
>    https://lore.kernel.org/linux-iommu/20230110025408.667767-1-
> baolu.lu@...ux.intel.com/
> 3) (Merged) [PATCH] selftests: iommu: Fix test_cmd_destroy_access() call in
> user_copy
>    https://lore.kernel.org/lkml/20230120074204.1368-1-nicolinc@nvidia.com/
> 

No need to list merged work as dependency. In concept every commit
merged in the version which this series is rebased to is required. 😊