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Bug 1774329 - [RHEL 7] Do not update SKL-SP/W/X (CPUID 0x50654, 06-55-04) to revision 0x2000065 by default
Summary: [RHEL 7] Do not update SKL-SP/W/X (CPUID 0x50654, 06-55-04) to revision 0x200...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: microcode_ctl
Version: 7.8
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Eugene Syromiatnikov
QA Contact: Jeff Bastian
URL:
Whiteboard:
Depends On: 1774322
Blocks: 1774635
TreeView+ depends on / blocked
 
Reported: 2019-11-20 03:10 UTC by Eugene Syromiatnikov
Modified: 2024-06-13 22:18 UTC (History)
4 users (show)

Fixed In Version: microcode_ctl-2.1-61.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1774322
: 1774635 (view as bug list)
Environment:
Last Closed: 2020-03-31 20:08:53 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2020:1166 0 None None None 2020-03-31 20:09:00 UTC

Description Eugene Syromiatnikov 2019-11-20 03:10:40 UTC 
There are reports of issues following update to revision 0x2000065 of 06-55-04 microcode:

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

Since, per [1], this revision is not required for recently unembargoed Intel CPU vulnerabilities and errata, it may be wise to disable update to it by default, the same way it has been done for SNB-EP (06-2d-07) microcode revision 0x718.

[1] https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00270-microcode-update-guidance.pdf
Comment 7 Jeff Bastian 2019-12-06 22:32:05 UTC 
Verified with microcode_ctl-2.1-61.el7

By default, the microcode is not updated to 0x2000065 due to the blacklist (it stays one revision behind which, as far as we know, is "safe" for all hardware):

[root@lenovo-sr650-01 ~]# lscpu | grep -i -e family -e model -e stepping
CPU family:            6
Model:                 85
Model name:            Intel(R) Xeon(R) Silver 4116 CPU @ 2.10GHz
Stepping:              4

[root@lenovo-sr650-01 ~]# rpm -q microcode_ctl
microcode_ctl-2.1-61.el7.x86_64

[root@lenovo-sr650-01 ~]# cat /sys/devices/system/cpu/cpu0/microcode/version
0x2000064



With the proper "force" file in place, though, the update works:

[root@lenovo-sr650-01 ~]# install -D /dev/null /etc/microcode_ctl/ucode_with_caveats/force-intel-06-55-04

[root@lenovo-sr650-01 ~]# /usr/libexec/microcode_ctl/update_ucode

[root@lenovo-sr650-01 ~]# dracut --force

[root@lenovo-sr650-01 ~]# lsinitrd /boot/initramfs-3.10.0-1118.el7.x86_64.img | grep GenuineIntel.bin
-rw-r--r--   1 root     root        34816 Dec  6 17:22 kernel/x86/microcode/GenuineIntel.bin

[root@lenovo-sr650-01 ~]# reboot
...

[root@lenovo-sr650-01 ~]# cat /sys/devices/system/cpu/cpu0/microcode/version
0x2000065

[root@lenovo-sr650-01 ~]# journalctl -b0 -o short-monotonic | sed "s/$(hostname) //" | grep microcode
[    0.000000] kernel: microcode: microcode updated early to revision 0x2000065, date = 2019-09-05
[    6.111887] kernel: microcode: sig=0x50654, pf=0x1, revision=0x2000065
[    6.112190] kernel: microcode: Microcode Update Driver: v2.01 <tigran.co.uk>, Peter Oruba
[   12.666502] systemd[1]: Starting Load CPU microcode update...
[   12.761976] reload_microcode[1447]: find: ‘standard output’: Broken pipe
[   12.762594] reload_microcode[1447]: find: write error
[   12.793580] systemd[1]: Started Load CPU microcode update.



Note: the reload_microcode broken pipe errors appear to be a new bug, but that is unrelated to this bug.  I'll do some more investigation and open a new BZ if necessary.
Comment 9 errata-xmlrpc 2020-03-31 20:08:53 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1166
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