[PATCH v2 18/20 DO-NOT-MERGE] arm64: Drop BBML3 requirement for HVO

[James Houghton <jthoughton@google.com>]

With PMD updates being done with the Access Flag trick, BBML3 is no
longer needed.

Dropping this requirement vastly widens the pool of systems this
optimization is valid for.

Signed-off-by: James Houghton <jthoughton@google.com>
---
 arch/arm64/kernel/cpufeature.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 448d4ef085de..f3fd6d0b0e41 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2206,11 +2206,10 @@ static bool has_bbm_through_af(const struct arm64_cpu_capabilities *caps, int sc
 	}
 
 	/*
-	 * We need BBML3 to support Block -> Table transitions without taking
-	 * faults, and we need HW AF support to support changing the OA without
-	 * taking faults.
+	 * We need HW AF support to support changing the vmemmap mapping level
+	 * and OA without taking faults.
 	 */
-	return cpu_supports_bbml3() && cpu_has_hw_af();
+	return cpu_has_hw_af();
 }
 
 static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused)
-- 
2.56.0.rc1.315.gc6ed9934b7-goog