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On x86/x64, the TSC clocksource is available in a Hyper-V VM only if Hyper-V provides the TSC_INVARIANT flag. The rating on the Hyper-V Reference TSC page clocksource is currently set so that it will not override the TSC clocksource in this case. Alternatively, if the TSC clocksource is not available, then the Hyper-V clocksource is used. But on ARM64, the Hyper-V Reference TSC page clocksource should override the ARM arch counter, since the Hyper-V clocksource provides scaling and offsetting during live migrations that is not provided for the ARM arch counter. To get the needed behavior for both x86/x64 and ARM64, tweak the logic by defaulting the Hyper-V Reference TSC page clocksource rating to a large value that will always override. If the Hyper-V TSC_INVARIANT flag is set, then reduce the rating so that it will not override the TSC. While the logic for getting there is slightly different, the net result in the normal cases is no functional change. Signed-off-by: Michael Kelley <mikelley@microsoft.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/1614721102-2241-10-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu <wei.liu@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.