arm64: Make icache detection a cpu capability
Now that we only have two icache policies, we are in a good position
to make the whole detection business more robust.
Let's replace __icache_flags by a single capability (ICACHE_PIPT),
and use this if all CPUs are indeed PIPT. It means we can rely on
existing logic to mandate that a VIPT CPU coming up late will be
denied booting, which is the safe thing to do.
This also leads to some nice cleanups in pKVM. Additionally,
cache_is_aliasing() is made __always_inline in order to avoid
surprisees in the nVHE hypervisor object.
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
7 files changed
