Enable elastic scaling node side feature on Polkadot

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Staking runtime api to check if reward is pending for an era ([polkadot-fellows/runtimes#318](https://github.com/polkadot-fellows/runtimes/pull/318))
 - Allow any parachain to have bidirectional channel with any system parachains ([polkadot-fellows/runtimes#329](https://github.com/polkadot-fellows/runtimes/pull/329))
 - Enable support for new hardware signers like the generic ledger app ([polkadot-fellows/runtimes#337](https://github.com/polkadot-fellows/runtimes/pull/337))
+- Enable Elastic Scaling node side feature for Polkadot ([polkadot-fellows/runtimes#340](https://github.com/polkadot-fellows/runtimes/pull/340))
 
 ### Changed
 

relay/polkadot/src/lib.rs

@@ -1803,6 +1803,9 @@ pub type Migrations = (migrations::Unreleased, migrations::Permanent);
 #[allow(deprecated, missing_docs)]
 pub mod migrations {
 	use super::*;
+	use frame_support::traits::OnRuntimeUpgrade;
+	use frame_system::RawOrigin;
+	use runtime_parachains::configuration::WeightInfo;
 	#[cfg(feature = "try-runtime")]
 	use sp_core::crypto::ByteArray;
 
@@ -1886,6 +1889,18 @@ pub mod migrations {
 		}
 	}
 
+	/// Enable the elastic scaling node side feature.
+	///
+	/// This is required for Coretime to ensure the relay chain processes parachains that are
+	/// assigned to multiple cores.
+	pub struct EnableElasticScalingNodeFeature;
+	impl OnRuntimeUpgrade for EnableElasticScalingNodeFeature {
+		fn on_runtime_upgrade() -> Weight {
+			let _ = Configuration::set_node_feature(RawOrigin::Root.into(), 1, true);
+			weights::runtime_parachains_configuration::WeightInfo::<Runtime>::set_node_feature()
+		}
+	}
+
 	// We don't have a limit in the Relay Chain.
 	const IDENTITY_MIGRATION_KEY_LIMIT: u64 = u64::MAX;
 
@@ -1907,6 +1922,7 @@ pub mod migrations {
 			ImOnlinePalletName,
 			<Runtime as frame_system::Config>::DbWeight,
 		>,
+		EnableElasticScalingNodeFeature,
 	);
 
 	/// Migrations/checks that do not need to be versioned and can run on every update.