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The IBPB_RET bit indicates that the CPU's implementation of MSR_PRED_CMD.IBPB does flush the RSB/RAS too. This is part of XSA-422 / CVE-2022-23824. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com>