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By default, X86(-64) systems use the emergecy restart routine in the course of which the code unconditionally writes to the physical address of 0x472 to indicate the boot mode to the firmware (BIOS or UEFI). When the kernel itself runs as a firmware in the VTL mode, that write corrupts the memory of the guest upon emergency restarting. Preserving the state intact in that situation is important for debugging, at least. Define the specialized machine callback to avoid that write and use the triple fault to perform emergency restart. Signed-off-by: Roman Kisel <romank@linux.microsoft.com> Link: https://lore.kernel.org/r/20250227214728.15672-2-romank@linux.microsoft.com Signed-off-by: Wei Liu <wei.liu@kernel.org> Message-ID: <20250227214728.15672-2-romank@linux.microsoft.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 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.