[PATCH] KVM: arm64: nv: Truely enable nXS TLBI operations

[Marc Zyngier]

Although we now have support for nXS-flavoured TLBI instructions,
we still don't expose the feature to the guest thanks to a mixture
of misleading comment and use of a bunch of magic values.

Fix the comment and correctly express the masking of LS64, which
is enough to expose nXS to the world. Not that anyone cares...

Signed-off-by: Marc Zyngier <maz at kernel.org>
---
 arch/arm64/kvm/nested.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index 81e0374a4a45b..b3c8d8e04a547 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -810,8 +810,8 @@ static u64 limit_nv_id_reg(u32 id, u64 val)
 		break;
 
 	case SYS_ID_AA64ISAR1_EL1:
-		/* Support everything but Spec Invalidation */
-		val &= ~(GENMASK_ULL(63, 56)	|
+		/* Support everything but Spec Invalidation and LS64 */
+		val &= ~(NV_FTR(ISAR1, LS64)	|
 			 NV_FTR(ISAR1, SPECRES));
 		break;
 
-- 
2.39.2