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The general invariant is that all devices in an iommu_group are attached to group->domain. We missed some cases here where an owned group would not get the device attached. Rework this logic so it follows the default domain flow of the bus_iommu_probe() - call iommu_alloc_default_domain(), then use __iommu_group_set_domain_internal() to set up all the devices. Finally always attach the device to the current domain if it is already set. This is an unlikely functional issue as iommufd uses iommu_attach_group(). It is possible to hot plug in a new group member, add a vfio driver to it and then hot add it to an existing iommufd. In this case it is required that the core code set the iommu_domain properly since iommufd won't call iommu_attach_group() again. Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/9-v5-1b99ae392328+44574-iommu_err_unwind_jgg@nvidia.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.