Four servers are up now on PS3 and RPCS3: Conquest Small, Heist, Blood Money and Team Deathmatch.
They rotate through the nine base game maps, and you don't need Premium.
To join: update to 1.08, set your Primary DNS to 165.227.128.12, start the game and go to Multiplayer. On RPCS3 you need the IP/Hosts switches from the guide.
Guide: https://psrestored.online/play#bfhl
Servers and leaderboard: https://psrestored.online/bfhl
It's an alpha, so report if anything breaks to PS3 restored discord
Source: r/BF_Hardline · by /u/Desh282