Function alloc_memseg

freebsd/amd64/vmm/vmm_dev.c:280–317

}

static int
alloc_memseg(struct vmmdev_softc *sc, struct vm_memseg *mseg, size_t len)
{
	char *name;
	int error;
	bool sysmem;

	error = 0;
	name = NULL;
	sysmem = true;

	/*
	 * The allocation is lengthened by 1 to hold a terminating NUL.  It'll
	 * by stripped off when devfs processes the full string.
	 */
	if (VM_MEMSEG_NAME(mseg)) {
		sysmem = false;
		name = malloc(len, M_VMMDEV, M_WAITOK);
		error = copystr(mseg->name, name, len, NULL);
		if (error)
			goto done;
	}

	error = vm_alloc_memseg(sc->vm, mseg->segid, mseg->len, sysmem);
	if (error)
		goto done;

	if (VM_MEMSEG_NAME(mseg)) {
		error = devmem_create_cdev(vm_name(sc->vm), mseg->segid, name);
		if (error)
			vm_free_memseg(sc->vm, mseg->segid);
		else
			name = NULL;	/* freed when 'cdev' is destroyed */
	}
done:
	free(name, M_VMMDEV);
	return (error);
}

static int
vm_get_register_set(struct vm *vm, int vcpu, unsigned int count, int *regnum,