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Commit 8d171045069c804e5ffaa18be590c42c6af0cf3f upstream. All microcode patches up to the proper BIOS Entrysign fix are loaded only after the sha256 signature carried in the driver has been verified. Microcode patches after the Entrysign fix has been applied, do not need that signature verification anymore. In order to not abandon machines which haven't received the BIOS update yet, add the capability to select which microcode patch to load. The corresponding microcode container supplied through firmware-linux has been modified to carry two patches per CPU type (family/model/stepping) so that the proper one gets selected. Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Tested-by: Waiman Long <longman@redhat.com> Link: https://patch.msgid.link/20251027133818.4363-1-bp@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 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.