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One of the oddities of the architecture is that the AArch64 views of the AArch32 ID registers are UNKNOWN if AArch32 isn't implemented at any EL. Nonetheless, KVM exposes these registers to userspace for the sake of save/restore. It is possible that the UNKNOWN value could differ between systems, leading to a rejected write from userspace. Avoid the issue altogether by handling the AArch32 ID registers as RAZ/WI when on an AArch64-only system. Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220913094441.3957645-7-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.