Xen early CPU microcode loading

Packages amd-ucode and intel-ucode install their respective cpio archives to /boot/.

You can tell Xen to scan for and load a~~n unarchived~~ binary blob early by adding ucode=scan to the Xen kernel command line.

To enable Xen to find the microcode I manually unarchive the image every time the -ucode package is updated, /# cpio -div < /boot/*-ucode.img, and the blob will be extracted into kernel/x86/microcode/. I then have a /etc/mkinitfs/features.d/ucode.files:

/kernel/x86/microcode

and include that in the feature set in /etc/mkinitfs/mkinitfs.conf to include the blob in the initramfs image.

How could this best be automated?

Edited Jan 28, 2021 by omni

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