Bug#1043355: linux: Select MICROCODE_LATE_LOADING
Package: src:linux
Version: 6.5~rc4-1~exp1
Severity: Normal
Dear Debian folks,
Currently, Debian’s Linux kernel does not allow late loading microcode
updates. Although discouraged, there are environments where that is
preferred to rebooting/kexec’ing the system. It’d be great, if you could
enable this.
The option was introduced in Linux 5.19, and backported to Linux
5.15.99. Before the feature was working, but as the config defaults to
no, it no longer does.
$ grep LATE_L /boot/config-6.*
/boot/config-6.4.0-1-amd64:# CONFIG_MICROCODE_LATE_LOADING is not set
/boot/config-6.5.0-0-amd64:# CONFIG_MICROCODE_LATE_LOADING is not set
The reason is, that the commit adding the new option
`CONFIG_MICROCODE_LATE_LOADING`, introduced in Linux with commit
a77a94f86273 (x86/microcode: Default-disable late loading) [1] was
backported to stable release v5.15.99 in commit 6d2b3a31 [2], and the
Linux configuration was not updated.
Kind regards,
Paul
[1]:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a77a94f86273ce42a39cb479217dd8d68acfe0ff
[2]:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6d2b3a319144f3f5148d8a2b19549ea3bb118c2e
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