RE: [PATCH v6 08/14] iommufd/selftest: Require vdev_id when attaching to a nested domain

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To: Nicolin Chen <nicolinc@xxxxxxxxxx>, "jgg@xxxxxxxxxx" <jgg@xxxxxxxxxx>, "corbet@xxxxxxx" <corbet@xxxxxxx>, "will@xxxxxxxxxx" <will@xxxxxxxxxx>
Subject: RE: [PATCH v6 08/14] iommufd/selftest: Require vdev_id when attaching to a nested domain
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Tue, 18 Feb 2025 05:15:22 +0000
Accept-language: en-US
Cc: "joro@xxxxxxxxxx" <joro@xxxxxxxxxx>, "suravee.suthikulpanit@xxxxxxx" <suravee.suthikulpanit@xxxxxxx>, "robin.murphy@xxxxxxx" <robin.murphy@xxxxxxx>, "dwmw2@xxxxxxxxxxxxx" <dwmw2@xxxxxxxxxxxxx>, "baolu.lu@xxxxxxxxxxxxxxx" <baolu.lu@xxxxxxxxxxxxxxx>, "shuah@xxxxxxxxxx" <shuah@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "iommu@xxxxxxxxxxxxxxx" <iommu@xxxxxxxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "linux-kselftest@xxxxxxxxxxxxxxx" <linux-kselftest@xxxxxxxxxxxxxxx>, "linux-doc@xxxxxxxxxxxxxxx" <linux-doc@xxxxxxxxxxxxxxx>, "eric.auger@xxxxxxxxxx" <eric.auger@xxxxxxxxxx>, "jean-philippe@xxxxxxxxxx" <jean-philippe@xxxxxxxxxx>, "mdf@xxxxxxxxxx" <mdf@xxxxxxxxxx>, "mshavit@xxxxxxxxxx" <mshavit@xxxxxxxxxx>, "shameerali.kolothum.thodi@xxxxxxxxxx" <shameerali.kolothum.thodi@xxxxxxxxxx>, "smostafa@xxxxxxxxxx" <smostafa@xxxxxxxxxx>, "ddutile@xxxxxxxxxx" <ddutile@xxxxxxxxxx>, "Liu, Yi L" <yi.l.liu@xxxxxxxxx>, "patches@xxxxxxxxxxxxxxx" <patches@xxxxxxxxxxxxxxx>
In-reply-to: <3d943ec41bcdc2a3a8ef78c9433e5558be19bf81.1737754129.git.nicolinc@nvidia.com>
References: <cover.1737754129.git.nicolinc@nvidia.com> <3d943ec41bcdc2a3a8ef78c9433e5558be19bf81.1737754129.git.nicolinc@nvidia.com>

> From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> Sent: Saturday, January 25, 2025 8:31 AM
> 
> When attaching a device to a vIOMMU-based nested domain, vdev_id must
> be
> present. Add a piece of code hard-requesting it, preparing for a vEVENTQ
> support in the following patch. Then, update the TEST_F.
> 
> A HWPT-based nested domain will return a NULL new_viommu, thus no such
> a
> vDEVICE requirement.
> 
> Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

References:
- [PATCH v6 00/14] iommufd: Add vIOMMU infrastructure (Part-3: vEVENTQ)
  - From: Nicolin Chen
- [PATCH v6 08/14] iommufd/selftest: Require vdev_id when attaching to a nested domain
  - From: Nicolin Chen

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