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3be405e89f
Add a comment to amd_iommu_update_ga() to document what fields it can safely modify without issuing an invalidation of the IRTE, and to explain its role in keeping GA IRTEs up-to-date. Per page 93 of the IOMMU spec dated Feb 2025: When virtual interrupts are enabled by setting MMIO Offset 0018h[GAEn] and IRTE[GuestMode=1], IRTE[IsRun], IRTE[Destination], and if present IRTE[GATag], are not cached by the IOMMU. Modifications to these fields do not require an invalidation of the Interrupt Remapping Table. Link: https://lore.kernel.org/all/9b7ceea3-8c47-4383-ad9c-1a9bbdc9044a@oracle.com Cc: Joao Martins <joao.m.martins@oracle.com> Link: https://lore.kernel.org/r/20250611224604.313496-41-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
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 reStructuredText 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.