Remove the netting or strings on pork roast, keeping them intact to use again. Combine rosemary, 3 cloves of garlic, parsley, 3 teaspoons of olive oil, 1 tablespoon kosher salt, and 1 tablespoon freshly ground black pepper in a bowl. Slice open the pork roast and spread it with the oil and herb mixture. Roll up the pork and secure it with the netting or string. Rub outside of the roast with remaining 1 teaspoon olive oil and salt and pepper to taste.