vm_munmap_memseg
if (vm_munmap_memseg(pi->pi_vmctx, sc->fbaddr, FB_SIZE) != 0)
if (vm_munmap_memseg(pi->pi_vmctx, addr, size) != 0) {
int vm_munmap_memseg(struct vmctx *ctx, vm_paddr_t gpa, size_t len);
res = vm_munmap_memseg(ctx, MAP_OFF, SEG_SZ);
res = vm_munmap_memseg(ctx, LOWER_OFF, LOWER_SZ);
res = vm_munmap_memseg(ctx, UPPER_OFF, UPPER_SZ);
int vm_munmap_memseg(struct vm *, vm_paddr_t, size_t);
error = vm_munmap_memseg(sc->vmm_vm, mu.gpa, mu.len);