test: on-hardware SMP self-test (revoke/kill must stop every hart) + make test-qemu

scripts/make-disk-image.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -euo pipefail
 
-IMG="boot.img"
+IMG="${IMG:-boot.img}"
 IMG_SIZE_KB=4096
 TARGET="riscv64gc-unknown-none-elf"
 BUILD_DIR="target/${TARGET}/release"
@@ -30,6 +30,10 @@ copy log-server     "log.elf"
 copy permission-manager "permis.elf"
 copy storage-qemu   "storage.elf"
 copy session-server "session.elf"
+# Only the test image: its presence makes init run the SMP self-test.
+if [ -n "${SMPTEST:-}" ]; then
+    copy smptest    "smptest.elf"
+fi
 
 echo ""
 echo "Disk contents:"