Check self-delegation against provided minimum

x/staking/keeper/msg_server.go

@@ -175,6 +175,10 @@ func (k msgServer) EditValidator(goCtx context.Context, msg *types.MsgEditValida
 			return nil, types.ErrMinSelfDelegationDecreased
 		}
 
+		if msg.MinSelfDelegation.GT(validator.Tokens) {
+			return nil, types.ErrSelfDelegationBelowMinimum
+		}
+
 		validator.MinSelfDelegation = (*msg.MinSelfDelegation)
 	}
 

x/staking/types/msg.go

@@ -120,6 +120,10 @@ func (msg MsgCreateValidator) ValidateBasic() error {
 		return err
 	}
 
+	if !msg.Value.Amount.GTE(msg.MinSelfDelegation) {
+		return ErrSelfDelegationBelowMinimum
+	}
+
 	return nil
 }