feat: vm-native-setup target-machine refit and identity knobs

scripts/split_smbios.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+"""Split a raw SMBIOS structure table into one file per structure for QEMU.
+
+Reads a dumped DMI table (/sys/firmware/dmi/tables/DMI on the real machine),
+writes one `-smbios file=` blob per structure into OUTDIR, and prints the
+ordered list of paths. A complete set through the type-127 end marker is what
+lets QEMU build a well-formed entry point from a dump.
+
+Each structure is a 4-byte header (type, length, handle:u16) + (length-4)
+formatted bytes + a string set terminated by a double NUL; a structure with no
+strings is still followed by 0x0000.
+"""
+import os
+import sys
+
+
+def split(data):
+    out, i, n = [], 0, len(data)
+    while i + 4 <= n:
+        stype, slen = data[i], data[i + 1]
+        if slen < 4:
+            break
+        j = i + slen
+        while j + 1 < n and not (data[j] == 0 and data[j + 1] == 0):
+            j += 1
+        j += 2
+        out.append((stype, data[i:j]))
+        i = j
+        if stype == 127:
+            break
+    return out
+
+
+def main():
+    dmi, outdir = sys.argv[1], sys.argv[2]
+    data = open(dmi, "rb").read()
+    os.makedirs(outdir, exist_ok=True)
+    structs = split(data)
+    paths = []
+    for idx, (stype, blob) in enumerate(structs):
+        p = os.path.join(outdir, "sm_%02d_type%d.bin" % (idx, stype))
+        open(p, "wb").write(blob)
+        paths.append(p)
+    print("# %d structures: %s" % (len(structs), ",".join(str(t) for t, _ in structs)))
+    for p in paths:
+        print(p)
+
+
+if __name__ == "__main__":
+    main()