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87684fd997
When caching mode is enabled for IOMMU, we should send explicit IOTLB PSIs even for newly created mappings. However these events are missing for all intel_iommu_map() callers, e.g., iommu_map(). One direct user is the vfio-pci driver. To make sure we'll send the PSIs always when necessary, this patch firstly introduced domain_mapping() helper for page mappings, then fixed the problem by generalizing the explicit map IOTLB PSI logic into that new helper. With that, we let iommu_domain_identity_map() to use the simplified version to avoid sending the notifications, while for all the rest of cases we send the notifications always. For VM case, we send the PSIs to all the backend IOMMUs for the domain. This patch allows the nested device assignment to work with QEMU (assign device firstly to L1 guest, then assign it again to L2 guest). Signed-off-by: Peter Xu <peterx@redhat.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.