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Rework the MSR_FILTER_CHANGED request into a more generic RECALC_INTERCEPTS request, and expand the responsibilities of vendor code to recalculate all intercepts that vary based on userspace input, e.g. instruction intercepts that are tied to guest CPUID. Providing a generic recalc request will allow the upcoming mediated PMU support to trigger a recalc when PMU features, e.g. PERF_CAPABILITIES, are set by userspace, without having to make multiple calls to/from PMU code. As a bonus, using a request will effectively coalesce recalcs, e.g. will reduce the number of recalcs for normal usage from 3+ to 1 (vCPU create, set CPUID, set PERF_CAPABILITIES (Intel only), set filter). The downside is that MSR filter changes that are done in isolation will do a small amount of unnecessary work, but that's already a relatively slow path, and the cost of recalculating instruction intercepts is negligible. Tested-by: Xudong Hao <xudong.hao@intel.com> Link: https://lore.kernel.org/r/20250806195706.1650976-25-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.