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Report that AMD x86 CPUs are vulnerable to the RETBleed (Arbitrary Speculative Code Execution with Return Instructions) attack. [peterz: add hygon] [kim: invert parity; fam15h] Co-developed-by: Kim Phillips <[email protected]> Signed-off-by: Kim Phillips <[email protected]> Signed-off-by: Alexandre Chartre <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Reviewed-by: Josh Poimboeuf <[email protected]> Signed-off-by: Borislav Petkov <[email protected]>