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c38595ad69
Add macro-built helpers for testing, setting, and clearing MSRPM entries without relying on precomputed offsets. This sets the stage for eventually removing general KVM use of precomputed offsets, which are quite confusing and rather inefficient for the vast majority of KVM's usage. Outside of merging L0 and L1 bitmaps for nested SVM, using u32-indexed offsets and accesses is at best unnecessary, and at worst introduces extra operations to retrieve the individual bit from within the offset u32 value. And simply calling them "offsets" is very confusing, as the "unit" of the offset isn't immediately obvious. Use the new helpers in set_msr_interception_bitmap() and msr_write_intercepted() to verify the math and operations, but keep the existing offset-based logic in set_msr_interception_bitmap() to sanity check the "clear" and "set" operations. Manipulating MSR interceptions isn't a hot path and no kernel release is ever expected to contain this specific version of set_msr_interception_bitmap() (it will be removed entirely in the near future). Link: https://lore.kernel.org/r/20250610225737.156318-14-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.