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fc6ee952cf
Each read/write to a trapped timer system register results in a whole kvm_timer_vcpu_put/load() cycle which affects all of the timers, and a bit more. There is no need for such a thing, and we can limit the impact to the timer being affected, and only this one. This drastically simplifies the emulated case, and limits the damage for trapped accesses. This also brings some performance back for NV. Whilst we're at it, fix a comment that didn't quite capture why we always set CNTVOFF_EL2 to 0 when disabling the virtual timer. Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20230112123829.458912-3-maz@kernel.org Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
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.