diff options
| author | Marcos Del Sol Vives <[email protected]> | 2021-10-17 11:44:10 +0200 |
|---|---|---|
| committer | Borislav Petkov <[email protected]> | 2021-10-21 15:49:07 +0200 |
| commit | 639475d434b88b58827e1aae601ed1853803f5be (patch) | |
| tree | cc81c93c8ec0e1e151329de036ec4f2619cd03cf /drivers/fpga/fpga-bridge.c | |
| parent | f3f07ae425bc09039d9e0c73c86b76f95d9d5cd6 (diff) | |
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 <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'drivers/fpga/fpga-bridge.c')
0 files changed, 0 insertions, 0 deletions