FEAT_TLBIOS has been introduced by a recent patch [1] which was however missing to include the outer shareable case in the Msr disambiguation switch. Which meant the TLBIOS instructions were decoded as normal MSR instructions, with no effect whatsoever on the TLBs [1]: https://gem5-review.googlesource.com/c/public/gem5/+/70567 Change-Id: I41665a4634fbe0ee8cc30dbc5d88d63103082ae9 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>