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Commit13423063c7("arm64: kvm, smccc: Introduce and use API for getting hypervisor UUID") replaced the explicit register constants with the UUID_INIT macro. However, there is an endian issue, meaning the UUID generated and used in the handshake didn't match UUID prior to the commit. The change in UUID causes the SMCCC vendor handshake to fail with older guest kernels, meaning devices such as PTP were not available in the guest. This patch updates the parameters to the macro to generate a UUID which matches the previous value, and re-establish backwards compatibility with older guest kernels. Fixes:13423063c7("arm64: kvm, smccc: Introduce and use API for getting hypervisor UUID") Signed-off-by: Jack Thomson <jackabt@amazon.com> Reviewed-by: Marc Zyngier <maz@kernel.org> Tested-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Link: https://lore.kernel.org/r/20250721130558.50823-1-jackabt.amazon@gmail.com Signed-off-by: Will Deacon <will@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 reStructuredText 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.