On 9/19/18 1:55 AM, Christoph wrote: > > Hi > > can someone say me how to update the µcode of the cpu with xen? > > I have added the ucode=scan parameter to xen but it does not seem to > work... > > the µcode version of my xeon is really old :/ > > model name : Intel(R) Xeon(R) CPU E3-1271 v3 @ 3.60GHz > microcode : 0x10 > There is a "caveat" in the current version of microcode_ctl which means it doesn't automatically install the microcode into the initramfs if the kernel isn't "known good" because of various issues with Linux kernel patches being needed for certain microcode features. There is a quick way to get it to force the microcode into the initramfs of any kernel: mkdir -p /etc/microcode_ctl/ucode_with_caveats/ touch /etc/microcode_ctl/ucode_with_caveats/force This only works with the most recent version of microcode_ctl (2.1-29.16.el7_5.x86_64). If you do this, you can then run 'yum reinstall microcode_ctl' and you should get the microcode in the initramfs after it finishes. Note that this will cause it to trust ALL kernels and all microcode versions which might not always be a good thing. See this file for info: /usr/share/doc/microcode_ctl/README.caveats You can test that the initramfs has the microcode by running cpio: cpio -t < /boot/initramfs-4.9.112-32.el7.x86_64.img If there is a GenuineIntel.bin you should be good. If you get spammed with errors, then it isn't included. -- Kevin Stange Chief Technology Officer Steadfast | Managed Infrastructure, Datacenter and Cloud Services 800 S Wells, Suite 190 | Chicago, IL 60607 312.602.2689 X203 | Fax: 312.602.2688 kevin@xxxxxxxxxxxxx | www.steadfast.net _______________________________________________ CentOS-virt mailing list CentOS-virt@xxxxxxxxxx https://lists.centos.org/mailman/listinfo/centos-virt
