diff options
| author |   Marcos Del Sol Vives <marcos@orca.pet> | 2021-10-17 11:44:10 +0200 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2021-10-21 15:49:07 +0200 |
| commit | 639475d434b88b58827e1aae601ed1853803f5be (patch) | |
| tree | cc81c93c8ec0e1e151329de036ec4f2619cd03cf /arch/x86/kernel/cpu/common.c | |
| parent | x86/umip: Downgrade warning messages to debug loglevel (diff) | |
| download | linux-dev-639475d434b88b58827e1aae601ed1853803f5be.tar.xz linux-dev-639475d434b88b58827e1aae601ed1853803f5be.zip | |
x86/CPU: Add support for Vortex CPUs
DM&P devices were not being properly identified, which resulted in
unneeded Spectre/Meltdown mitigations being applied.
The manufacturer states that these devices execute always in-order and
don't support either speculative execution or branch prediction, so
they are not vulnerable to this class of attack. [1]
This is something I've personally tested by a simple timing analysis
on my Vortex86MX CPU, and can confirm it is true.
Add identification for some devices that lack the CPUID product name
call, so they appear properly on /proc/cpuinfo.
¹https://www.ssv-embedded.de/doks/infos/DMP_Ann_180108_Meltdown.pdf
[ bp: Massage commit message. ]
Signed-off-by: Marcos Del Sol Vives <marcos@orca.pet>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211017094408.1512158-1-marcos@orca.pet
Diffstat (limited to 'arch/x86/kernel/cpu/common.c')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 0f8885949e8c..325d6022599b 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1044,6 +1044,8 @@ static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = { VULNWL(CENTAUR, 5, X86_MODEL_ANY, NO_SPECULATION), VULNWL(INTEL, 5, X86_MODEL_ANY, NO_SPECULATION), VULNWL(NSC, 5, X86_MODEL_ANY, NO_SPECULATION), + VULNWL(VORTEX, 5, X86_MODEL_ANY, NO_SPECULATION), + VULNWL(VORTEX, 6, X86_MODEL_ANY, NO_SPECULATION), /* Intel Family 6 */ VULNWL_INTEL(ATOM_SALTWELL, NO_SPECULATION | NO_ITLB_MULTIHIT), |