9b8bb5c4e25678af895dc9dd4a1e82b2f948cacc - pub/scm/linux/kernel/git/rt/linux-rt-devel

commit	9b8bb5c4e25678af895dc9dd4a1e82b2f948cacc	[log] [tgz]
author	Borislav Petkov (AMD) <bp@alien8.de>	Sat Jul 15 13:41:28 2023 +0200
committer	Greg Kroah-Hartman <gregkh@linuxfoundation.org>	Mon Jul 24 18:56:41 2023 +0200
tree	658260fd9d3c58f296fdbb7bf20d1c02ae60f94b
parent	fee9e863965831972da046e657f412a575de1c3d [diff]

x86/cpu/amd: Add a Zenbleed fix

commit 522b1d69219d8f083173819fde04f994aa051a98 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/x86/include/asm/microcode.h[diff]
arch/x86/include/asm/microcode_amd.h[diff]
arch/x86/include/asm/msr-index.h[diff]
arch/x86/kernel/cpu/amd.c[diff]
arch/x86/kernel/cpu/common.c[diff]

5 files changed

tree: 658260fd9d3c58f296fdbb7bf20d1c02ae60f94b