Will Deacon 532d581583 arm64: Treat SSBS as a non-strict system feature
If all CPUs discovered during boot have SSBS, then spectre-v4 will be
considered to be "mitigated". However, we still allow late CPUs without
SSBS to be onlined, albeit with a "SANITY CHECK" warning. This is
problematic for userspace because it means that the system can quietly
transition to "Vulnerable" at runtime.

Avoid this by treating SSBS as a non-strict system feature: if all of
the CPUs discovered during boot have SSBS, then late arriving secondaries
better have it as well.

Signed-off-by: Will Deacon <will@kernel.org>
2020-09-29 16:08:16 +01:00
..
2020-08-14 14:26:08 -07:00