Cook the mushrooms: Heat the olive oil over medium heat in a pressure cooker (if using an electric one, set to "sauté"). Cook the mushrooms until softened, about 8 minutes.
Add onion, garlic and rice: Add the onion and garlic and cook for one minute. Add the rice and cook for 1-2 minutes or until the outside of the rice is translucent and the inside looks milky.
Add the liquids: Add the white wine and soy sauce. Stir well and cook until the alcohol smell is gone and the wine is almost evaporated, about 2 minutes. Stir in the stock and close the pressure cooker.
Cook the risotto: Cook on low pressure for 5 minutes. Release the pressure by running cool water over the lid (for a stovetop pressure cooker) or by using the release valve (on an electric pressure cooker). (If the risotto is still very soupy, remove a few ladles of liquid.)
Make the risotto creamy: Cook the risotto for an additional 1-2 minutes with the lid open, stirring constantly, until creamy (for electric pressure cooker: use the sauté setting). Add the Parmesan and butter, stir once or twice (but don't stir in completely!). Close the lid (but do not cook any further!) and rest for 2 minutes. Now add the parsley and stir well. Serve immediately with extra cheese.