The microcode_ctl packages provide microcode updates for Intel. Security Fix: * hw: vt-d related privilege escalation * hw: improper isolation of shared resources in some Intel Processors * hw: observable timing discrepancy in some Intel Processors * hw: information disclosure on some Intel Atom processors Bug Fix and Enhancement: * Update Intel CPU microcode to microcode-20210525 release * Do not use grep -q in a pipe in check_caveats.