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Tag MSR_PLATFORM_INFO as a feature MSR (because it is), i.e. disallow it from being modified after the vCPU has run. To make KVM's selftest compliant, simply delete the userspace MSR write that restores KVM's original value at the end of the test. Verifying that userspace can write back what it originally read is uninteresting in this particular case, because KVM doesn't enforce _any_ bits in the MSR, i.e. userspace should be able to write any arbitrary value. Link: https://lore.kernel.org/r/20240802185511.305849-3-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.