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Add stub functions which is initially always return false. These provide the hooks that we need to update the range-based TLBI routines, whose operands are encoded differently depending on whether lpa2 is enabled or not. The kernel and kvm will enable the use of lpa2 asynchronously in future, and part of that enablement will involve fleshing out their respective hook to advertise when it is using lpa2. Since the kernel's decision to use lpa2 relies on more than just whether the HW supports the feature, it can't just use the same static key as kvm. This is another reason to use separate functions. lpa2_is_enabled() is already implemented as part of Ard's kernel lpa2 series. Since kvm will make its decision solely based on HW support, kvm_lpa2_is_enabled() will be defined as system_supports_lpa2() once kvm starts using lpa2. Reviewed-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20231127111737.1897081-3-ryan.roberts@arm.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 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.