x86/microcode/AMD: Handle the case of no BIOS microcode

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commit fcf8239ad6 upstream.

Machines can be shipped without any microcode in the BIOS. Which means,
the microcode patch revision is 0.

Handle that gracefully.

Fixes: 94838d230a ("x86/microcode/AMD: Use the family,model,stepping encoded in the patch ID")
Reported-by: Vítek Vávra <vit.vavra.kh@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Borislav Petkov (AMD) 2025-08-20 11:58:57 +02:00 • committed by Greg Kroah-Hartman

parent c76bf83591

commit 43be33b8a2

1 changed files with 20 additions and 2 deletions

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arch/x86/kernel/cpu/microcode/amd.c

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