Are all supply curves upward sloping

Yes, because you want to assume that the producer wants to make more product to make more money.

The answer is yes

The primary reason the supply curve slopes upward is because of potential for profit. Essentially, the supply curve illustrates how much a firm is willing to sell or supply, based strictly on firms in perfect competition. If a firm is in perfect competition, it will follow equilibrium principles and will be taking simple, economic steps towards making a profit.