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The PMU code suffers from a small defect where we assume that the event number provided by the guest is always 16 bit wide, even if the CPU only implements the ARMv8.0 architecture. This isn't really problematic in the sense that the event number ends up in a system register, cropping it to the right width, but still this needs fixing. In order to make it work, let's probe the version of the PMU that the guest is going to use. This is done by temporarily creating a kernel event and looking at the PMUVer field that has been saved at probe time in the associated arm_pmu structure. This in turn gets saved in the kvm structure, and subsequently used to compute the event mask that gets used throughout the PMU code. Signed-off-by: Marc Zyngier <maz@kernel.org>
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 Restructured Text 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.