x86/cpu: Fix AMD erratum #1485 on Zen4-based CPUs

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commit f454b18e07 upstream.

Fix erratum #1485 on Zen4 parts where running with STIBP disabled can
cause an #UD exception. The performance impact of the fix is negligible.

Reported-by: René Rebe <rene@exactcode.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: René Rebe <rene@exactcode.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/D99589F4-BC5D-430B-87B2-72C20370CF57@exactcode.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Borislav Petkov (AMD) 2023-10-07 12:57:02 +02:00 • committed by Greg Kroah-Hartman

parent 3863989497

commit 125f495fa6

2 changed files with 15 additions and 2 deletions

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arch/x86/include/asm/msr-index.h

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8

arch/x86/kernel/cpu/amd.c

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