Hello Dimitri,
The source of this is that the linux-aws (and some other cloud-specific)
kernels do not have CONFIG_MICROCODE_OLD_INTERFACE enabled, while they
are enabled in the generic kernel configs.
For consideration, this is the kernel config documentation for this
option:
config MICROCODE_OLD_INTERFACE
bool "Ancient loading interface (DEPRECATED)"
default n
depends on MICROCODE
---help---
DO NOT USE THIS! This is the ancient /dev/cpu/microcode interface
which was used by userspace tools like iucode_tool and microcode.ctl.
It is inadequate because it runs too late to be able to properly
load microcode on a machine and it needs special tools. Instead, you
should've switched to the early loading method with the initrd or
builtin microcode by now: Documentation/x86/microcode.rst
I'm going to mark this issue public. Thanks.
** Information type changed from Private Security to Public Security
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https://bugs.launchpad.net/bugs/1863299
Title:
linux-aws fails to late load microcode, works with generic
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