In another bowl, combine flour & salt. Add flour mixture, 1 cup at a time, combining with wet mixture. Once all flour has been added, knead dough for about 2 minutes until smooth & elastic consistency, Place dough in a greased bowl & cover with a towel or plastic wrap. Allow to rise in a warm place until doubled in bulk, about an hour. While the dough is rising, beat together guava paste & softened cream cheese to make filling. Line a 10-inch spring form pan with parchment paper; set aside.