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b467ab82a9
For userspace that wants to disable KVM_X86_QUIRK_STUFF_FEATURE_MSRS, it is useful to know what bits can be set to 1 in MSR_PLATFORM_INFO (apart from the TSC ratio). The right way to do that is via /dev/kvm's feature MSR mechanism. In fact, MSR_PLATFORM_INFO is already a feature MSR for the purpose of blocking updates after the vCPU is run, but KVM_GET_MSRS did not return a valid value for it. Just like in a VM that leaves KVM_X86_QUIRK_STUFF_FEATURE_MSRS enabled, the TSC ratio field is left to 0. Only bit 31 is set. Signed-off-by: Paolo Bonzini <pbonzini@redhat.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.