mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-07 03:15:31 +09:00
1dcf3264c1
commit dd5e3e3ca6ac011582a9f3f987493bf6741568c0 upstream.
The early loading code is overly complicated:
- It scans the builtin/initrd for microcode not only on the BSP, but also
on all APs during early boot and then later in the boot process it
scans again to duplicate and save the microcode before initrd goes
away.
That's a pointless exercise because this can be simply done before
bringing up the APs when the memory allocator is up and running.
- Saving the microcode from within the scan loop is completely
non-obvious and a left over of the microcode cache.
This can be done at the call site now which makes it obvious.
Rework the code so that only the BSP scans the builtin/initrd microcode
once during early boot and save it away in an early initcall for later
use.
[ bp: Test and fold in a fix from tglx ontop which handles the need to
distinguish what save_microcode() does depending on when it is
called:
- when on the BSP during early load, it needs to find a newer
revision than the one currently loaded on the BSP
- later, before SMP init, it still runs on the BSP and gets the BSP
revision just loaded and uses that revision to know which patch
to save for the APs. For that it needs to find the exact one as
on the BSP.
]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231017211722.629085215@linutronix.de
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.