Not sure about CentOS 6, but this was covered previously (at least for 7...not sure how much they differ)...not that I can find the message now, but here's what I recall/pieced together from bash history that works on CentOS 7:
If the microcode you want is in the microcode_ctl package:
mkdir -p /etc/microcode_ctl/ucode_with_caveats/ touch /etc/microcode_ctl/ucode_with_caveats/force yum reinstall microcode_ctl (there were arguably better ways to do this part, but I cant recall)
add ucode=scan to your GRUB_CMDLINE_XEN_DEFAULT line grub2-mkconfig to update your grub config reboot
Once that's done, every time microcode_ctl updates, you'll get the microcode on the next reboot just like any other centos machine.
Feel free to jump in if I missed any steps/caveats/notes, but that looks to be how I set it up on my machines last year.
Thanks, -Dave
On May 16, 2019, at 12:03, Sarah Newman srn@prgmr.com wrote:
On 5/16/19 2:12 AM, Karel Hendrych wrote:
Hi,
is there any guide for CPU microcode updates on CentOS6, Xen 4.10, kernel 4.9 ?
I'm not sure off the top of my head.
You can add ucode=scan to the xen command line, add a file /path/to/microcode_file as the last item in your boot list, and generate that microcode file using something like:
iucode_tool --write-earlyfw "${OUT_BLOB_FILE}" \ "${TEMP_DIR_NAME}/intel-ucode" \ "${TEMP_DIR_NAME}/intel-ucode-with-caveats"
Where the last two items have been extracted from the intel microcode tarball.
--Sarah _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org