]> www.infradead.org Git - users/jedix/linux-maple.git/commit
x86/rfds: Exclude P-only parts from the RFDS affected list
authorPawan Gupta <pawan.kumar.gupta@linux.intel.com>
Tue, 11 Mar 2025 15:03:08 +0000 (08:03 -0700)
committerIngo Molnar <mingo@kernel.org>
Wed, 19 Mar 2025 10:17:23 +0000 (11:17 +0100)
commit722fa0dba74f206999244facb177a8bfe3d513e6
tree255772494e27df311e8e918e5917711ae7536009
parentadf2de5e8d85aad3fa0319e1a524fa97d2aa8f90
x86/rfds: Exclude P-only parts from the RFDS affected list

The affected CPU table (cpu_vuln_blacklist) marks Alderlake and Raptorlake
P-only parts affected by RFDS. This is not true because only E-cores are
affected by RFDS. With the current family/model matching it is not possible
to differentiate the unaffected parts, as the affected and unaffected
hybrid variants have the same model number.

Add a cpu-type match as well for such parts so as to exclude P-only parts
being marked as affected.

Note, family/model and cpu-type enumeration could be inaccurate in
virtualized environments. In a guest affected status is decided by RFDS_NO
and RFDS_CLEAR bits exposed by VMMs.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20250311-add-cpu-type-v8-5-e8514dcaaff2@linux.intel.com
Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
arch/x86/kernel/cpu/common.c