Commit f3b4ee4e authored by Borislav Petkov (AMD)'s avatar Borislav Petkov (AMD) Committed by liubaolin
Browse files

x86/cpu/amd: Add a Zenbleed fix

mainline inclusion
from mainline-v6.5-rc4
commit 522b1d69
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I7T4O5
CVE: CVE-2023-20593

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=522b1d69219d8f083173819fde04f994aa051a98



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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: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: default avatarliubaolin <liubaolin@kylinos.cn>
parent 341a7876
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