x86/cpu/amd: Add a Zenbleed fix

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Add a fix for the Zen2 VZEROUPPER data corruption bug where under
certain circumstances executing VZEROUPPER can cause register
corruption or leak data.

The optimal fix is through microcode but in the case the proper
microcode revision has not been applied, enable a fallback fix using
a chicken bit.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>

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Borislav Petkov (AMD) 2023-07-15 13:41:28 +02:00

parent 8b6f687743

commit 522b1d6921

5 changed files with 66 additions and 0 deletions

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1

arch/x86/include/asm/microcode.h

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2

arch/x86/include/asm/microcode_amd.h

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1

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

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arch/x86/kernel/cpu/amd.c

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arch/x86/kernel/cpu/common.c

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