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2cfad132b5
The Performance Manager Unit was not described in the DTS which meant performance event monitoring was not possible. This was exposed by a change to the PMU handling in KVM in 5.11-rc3 which now prevents a PMU being exposed to a guest when the host does not provide one: "KVM: arm64: Don't access PMCR_EL0 when no PMU is available" Signed-off-by: Mathew McBride <matt@traverse.com.au> Signed-off-by: Shawn Guo <shawnguo@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.