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@xxxxxxxxx> 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
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