x86/cpu: Fix AMD erratum #1485 on Zen4-based CPUs
Fix erratum #1485 on Zen4 parts where running with STIBP disabled can cause an #UD exception. The performance impact of the fix is negligible. Reported-by:René Rebe <rene@exactcode.de> Signed-off-by:
Borislav Petkov (AMD) <bp@alien8.de> Tested-by:
René Rebe <rene@exactcode.de> Cc: <stable@kernel.org> Link: https://lore.kernel.org/r/D99589F4-BC5D-430B-87B2-72C20370CF57@exactcode.com
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025d5ac9