arm64: Use firmware to detect CPUs that are not affected by Spectre-v2

The SMCCC ARCH_WORKAROUND_1 service can indicate that although the
firmware knows about the Spectre-v2 mitigation, this particular
CPU is not vulnerable, and it is thus not necessary to call
the firmware on this CPU.

Let's use this information to our benefit.

Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Jeremy Linton <[email protected]>
Reviewed-by: Andre Przywara <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Tested-by: Stefan Wahren <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

0 files changed, 0 insertions, 0 deletions