No I think it's because kernel lockdown:
commit 708822cdbcd3faab40e83a79b71617e1812a1b06
Author: Matthew Garrett <mj...@srcf.ucam.org>
Date: Mon Feb 18 12:44:59 2019 +0000
UBUNTU: SAUCE: (efi-lockdown) x86/msr: Restrict MSR access when the kernel
is locked down
Writing to MSRs should not be allowed if the kernel is locked down, since
it could lead to execution of arbitrary code in kernel mode. Based on a
patch by Kees Cook.
MSR accesses are logged for the purposes of building up a whitelist as per
Alan Cox's suggestion.
Signed-off-by: Matthew Garrett <mj...@srcf.ucam.org>
Signed-off-by: David Howells <dhowe...@redhat.com>
Acked-by: Kees Cook <keesc...@chromium.org>
Reviewed-by: Thomas Gleixner <t...@linutronix.de>
cc: x...@kernel.org
Signed-off-by: Matthew Garrett <matthewgarr...@google.com>
(cherry picked from commit 323bd1cb92e03558ae3f3a11dd683dcbb23eeaea
git://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git)
Signed-off-by: Seth Forshee <seth.fors...@canonical.com>
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1840454
Title:
kernel 5.2 disallows thermald's direct MSR writes
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