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x86/cpu/amd: Add a Zenbleed fix

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Upstream commit: 522b1d69219d8f083173819fde04f994aa051a98

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>
This commit is contained in:
Borislav Petkov (AMD)
2023-07-15 13:41:28 +02:00
committed by Greg Kroah-Hartman
parent 191b8f9b0e
commit 93df00f9d4
5 changed files with 66 additions and 0 deletions
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arch/x86/kernel/cpu/common.c
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@@ -2165,6 +2165,8 @@ void microcode_check(struct cpuinfo_x86 *prev_info)
perf_check_microcode();
amd_check_microcode();
store_cpu_caps(&curr_info);
if (!memcmp(&prev_info->x86_capability, &curr_info.x86_capability,