Enable elastic scaling node side feature on Kusama (#205)

This feature is required for Kusama to ensure that Parachains that have
multiple cores assigned, still be able to include at least one block.
The relay chain itself doesn't support Parachains with multiple cores
assigned right now, but this will come in later updates.

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- [ ] Does not require a CHANGELOG entry

CHANGELOG.md

@@ -13,8 +13,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 0022-adopt-encointer-runtime.md) ([polkadot-fellows/runtimes#80](https://github.com/polkadot-fellows/runtimes/pull/80))
 - Feature for enabling debug prints in the Polkadot and Kusama runtime ([polkadot-fellows/runtimes#85](https://github.com/polkadot-fellows/runtimes/pull/85))
 - Added new "Wish for Change" track ([polkadot-fellows/runtimes#184](https://github.com/polkadot-fellows/runtimes/pull/184))
-- Enable Coretime and on-demand on Kusama ([polkadot-fellows/runtimes#159](https://github.com/polkadot-fellows/runtimes/pull/159)
-- Cancel Parachain Auctions [polkadot-fellows/runtimes#215](https://github.com/polkadot-fellows/runtimes/pull/215)
+- Enable Coretime and on-demand on Kusama ([polkadot-fellows/runtimes#159](https://github.com/polkadot-fellows/runtimes/pull/159))
+- Enable Elastic Scaling node side feature for Kusama ([polkadot-fellows/runtimes#205](https://github.com/polkadot-fellows/runtimes/pull/205))
+- Cancel Parachain Auctions ([polkadot-fellows/runtimes#215](https://github.com/polkadot-fellows/runtimes/pull/215))
 
 ### Changed
 

relay/kusama/src/lib.rs

@@ -1746,8 +1746,10 @@ pub type Migrations = (migrations::Unreleased, migrations::Permanent);
 pub mod migrations {
 	use super::*;
 	use frame_support::traits::OnRuntimeUpgrade;
+	use frame_system::RawOrigin;
 	use pallet_scheduler::WeightInfo as SchedulerWeightInfo;
 	use runtime_common::auctions::WeightInfo as AuctionsWeightInfo;
+	use runtime_parachains::configuration::WeightInfo;
 	#[cfg(feature = "try-runtime")]
 	use sp_core::crypto::ByteArray;
 
@@ -1772,6 +1774,18 @@ 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()
+		}
+	}
+
 	parameter_types! {
 		pub const ImOnlinePalletName: &'static str = "ImOnline";
 	}
@@ -1781,7 +1795,7 @@ pub mod migrations {
 	pub struct UpgradeSessionKeys;
 	const UPGRADE_SESSION_KEYS_FROM_SPEC: u32 = 1001002;
 
-	impl frame_support::traits::OnRuntimeUpgrade for UpgradeSessionKeys {
+	impl OnRuntimeUpgrade for UpgradeSessionKeys {
 		#[cfg(feature = "try-runtime")]
 		fn pre_upgrade() -> Result<Vec<u8>, sp_runtime::TryRuntimeError> {
 			if System::last_runtime_upgrade_spec_version() > UPGRADE_SESSION_KEYS_FROM_SPEC {
@@ -1903,6 +1917,7 @@ pub mod migrations {
 			crate::xcm_config::XcmRouter,
 			GetLegacyLeaseImpl,
 		>,
+		EnableElasticScalingNodeFeature,
 		// Upgrade `SessionKeys` to exclude `ImOnline`
 		UpgradeSessionKeys,
 		// Remove `im-online` pallet on-chain storage