Intel Skulake Scalable Platform CPU models that belong to Workstation and HEDT
(Basin Falls) segment (SKL-W/X, family 6, model 85, stepping 4) have reports
of system hangs on reboot when revision 0x2000065 of microcode, that is included
since microcode-20191112 update, is applied[1].  In order to address this,
microcode update to this revision has been disabled by default on these systems,
and the previously published microcode revision 0x2000064 is used by default
for the OS-driven microcode update.

[1] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/21

For the reference, SHA1 checksums of 06-55-04 microcode files containing
microcode revisions in question are listed below:
 * 06-55-04, revision 0x2000064: 2e405644a145de0f55517b6a9de118eec8ec1e5a
 * 06-55-04, revision 0x2000065: f27f12b9d53f492c297afd856cdbc596786fad23

Please contact your system vendor for a BIOS/firmware update that contains
the latest microcode version.  For the information regarding microcode versions
required for mitigating specific side-channel cache attacks, please refer
to the following knowledge base articles:
 * CVE-2017-5715 ("Spectre"):
   https://access.redhat.com/articles/3436091
 * CVE-2018-3639 ("Speculative Store Bypass"):
   https://access.redhat.com/articles/3540901
 * CVE-2018-3620, CVE-2018-3646 ("L1 Terminal Fault Attack"):
   https://access.redhat.com/articles/3562741
 * CVE-2018-12130, CVE-2018-12126, CVE-2018-12127, and CVE-2019-11091
   ("Microarchitectural Data Sampling"):
   https://access.redhat.com/articles/4138151
 * CVE-2019-0117 (Intel SGX Information Leak),
   CVE-2019-0123 (Intel SGX Privilege Escalation),
   CVE-2019-11135 (TSX Asynchronous Abort),
   CVE-2019-11139 (Voltage Setting Modulation):
   https://access.redhat.com/solutions/2019-microcode-nov

The information regarding enforcing microcode update is provided below.

To enforce usage of the 0x2000065 microcode revision for a specific kernel
version, please create a file "force-intel-06-55-04" inside
/lib/firmware/<kernel_version> directory, run
"/usr/libexec/microcode_ctl/update_ucode" to add it to firmware directory
where microcode will be available for late microcode update, and run
"dracut -f --kver <kernel_version>", so initramfs for this kernel version
is regenerated and the microcode can be loaded early, for example:

    touch /lib/firmware/3.10.0-862.9.1/force-intel-06-55-04
    /usr/libexec/microcode_ctl/update_ucode
    dracut -f --kver 3.10.0-862.9.1

After that, it is possible to perform a late microcode update by executing
"/usr/libexec/microcode_ctl/reload_microcode" or by writing value "1" to
"/sys/devices/system/cpu/microcode/reload" directly.

To enforce addition of this microcode for all kernels, please create file
"/etc/microcode_ctl/ucode_with_caveats/force-intel-06-55-04", run
"/usr/libexec/microcode_ctl/update_ucode" for enabling late microcode updates,
and "dracut -f --regenerate-all" for enabling early microcode updates:

    mkdir -p /etc/microcode_ctl/ucode_with_caveats
    touch /etc/microcode_ctl/ucode_with_caveats/force-intel-06-55-04
    /usr/libexec/microcode_ctl/update_ucode
    dracut -f --regenerate-all

Please refer to /usr/share/doc/microcode_ctl/README.caveats for additional
information.