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x86/cpu/amd: Add a Zenbleed fix
authorBorislav Petkov (AMD) <bp@alien8.de>
Sat, 15 Jul 2023 11:41:28 +0000 (13:41 +0200)
committerBorislav Petkov (AMD) <bp@alien8.de>
Mon, 17 Jul 2023 13:48:10 +0000 (15:48 +0200)
commit522b1d69219d8f083173819fde04f994aa051a98
tree19cd08e9f27e7e50e9036c04f678565e3be6df82tree | snapshot
parent8b6f687743dacce83dbb0c7cfacf88bab00f808acommit | diff
x86/cpu/amd: Add a Zenbleed fix

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>
arch/x86/include/asm/microcode.h diff | blob | history
arch/x86/include/asm/microcode_amd.h diff | blob | history
arch/x86/include/asm/msr-index.h diff | blob | history
arch/x86/kernel/cpu/amd.c diff | blob | history
arch/x86/kernel/cpu/common.c diff | blob | history
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