[seL4] Question about sel4-tutorial dynamic-2 and dynamic-3

Hi, I have two questions regarding dynamic-2 and dynamic-3 tutorials. 1. In dynamic-2 TASK 4, Why is the ipc_buffer_vaddr put in seL4_ARCH_PageTable_Map()? ipc_buffer_vaddr is the virtual address of the new physical frame allocated for the IPC buffer. I think seL4_ARCH_PageTable_Map's 3rd parameter is the virtual address of the page table frame. 2. In dynamic-3, it uses sel4utils_configure_process_custom() to create a new thread. I looked into the function and found that it created a vspace for the new thread. However, the tutorial's learning outcomes section says "this time the two threads will only share the same vspace", so I am confused. Does this tutorial create a new vspace for the new thread? Mincheol