Since the pool itself is imported read-only by default, there's no state to keep. We don't even need to export the pool, no txg's can be generated and left in a

Since the pool itself is imported read-only by default, there's no state to keep. We don't even need to export the pool, no txg's can be generated and left in a pending state. If a pool is switched to read-write so that the default kernel can be set, a snapshot cloned to a new BE, etc, we check for that and then export the pool just before kexec. Once kexec is done, your BEs kernel and initramfs essentially start fresh and actas if it's a fresh boot.