x86/cpu/amd: Add Spectral Chicken
Zen2 uarchs have an undocumented, unnamed, MSR that contains a chicken bit for some speculation behaviour. It needs setting. Note: very belatedly AMD released naming; it's now officially called MSR_AMD64_DE_CFG2 and MSR_AMD64_DE_CFG2_SUPPRESS_NOBR_PRED_BIT but shall remain the SPECTRAL CHICKEN. Suggested-by:Andrew Cooper <Andrew.Cooper3@citrix.com> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
Borislav Petkov <bp@suse.de> Reviewed-by:
Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by:
Borislav Petkov <bp@suse.de>
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a09a6e23
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