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Subject[PATCH 0/4] x86/microcode: Drop old interface and default-disable late loading
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From: Borislav Petkov <bp@suse.de>

Now tested.

AMD:

[ 349.234368] microcode: Attempting late microcode loading - it is dangerous and taints the kernel.
[ 349.244128] microcode: You should switch to early loading, if possible.
...
[ 349.391934] microcode: Reload completed, microcode revision: 0xa001173

Intel:

[ 50.726917] microcode: Attempting late microcode loading - it is dangerous and taints the kernel.
[ 50.736139] microcode: You should switch to early loading, if possible.
[ 50.745504] microcode: updated to revision 0x718, date = 2019-05-21
[ 50.752000] x86/CPU: CPU features have changed after loading microcode, but might not take effect.
[ 50.761158] x86/CPU: Please consider either early loading through initrd/built-in or a potential BIOS update.
[ 50.771362] microcode: Reload completed, microcode revision: 0x718

Changelog:
----------

v0:

Totally untested, just sending out as a RFC first. This is something
Peter and I talked about recently and think it makes sense.

Borislav Petkov (4):
x86/microcode: Rip out the OLD_INTERFACE
x86/microcode: Default-disable late loading
x86/microcode: Taint and warn on late loading
x86/microcode: Remove unnecessary perf callback

arch/x86/Kconfig | 15 ++--
arch/x86/kernel/cpu/common.c | 2 +
arch/x86/kernel/cpu/microcode/core.c | 115 +++------------------------
3 files changed, 20 insertions(+), 112 deletions(-)

--
2.35.1

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