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test: H3 — a nested hub tree yanked whole rebuilds whole (hot-plug matrix)

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hub -> hub -> keyboard, one device_del of the outer hub: the H2 recursion
runs at depth two (the inner hub is torn down as a child, its keyboard
first), the keyboard's driver is reaped, and re-adding all three rebinds.
This commit is contained in:
Daniel Samson
2026-08-09 14:09:19 +01:00
parent 77e7001878
commit c3604429d4
1 changed files with 24 additions and 0 deletions
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test/qemu_test.py
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@@ -1037,6 +1037,30 @@ CASES = [
r"(?=.*device-manager: reaping \S*usb-hid-keyboard[\s\S]*usb-hid-keyboard: ok)"
r"(?=.*device-manager: reaping \S*usb-hid-mouse[\s\S]*usb-hid-mouse: ok)",
"fail": r"DANOS-TEST-RESULT: FAIL"},
# Hot-plug matrix H3 (docs/hot-plug-matrix-plan.md): yank a NESTED hub tree.
# hub → hub → keyboard, one device_del of the outer hub — the recursion must
# go two levels (inner hub torn down as a child, ITS keyboard first), the
# keyboard's driver reaped, and re-adding all three rebuilds and rebinds.
{"name": "usb-hub-nested-yank",
"build_case": "usb-hid",
"smp": 4,
"timeout": 150,
"qemu_extra": ["-device", "qemu-xhci,id=xhci2",
"-device", "usb-hub,bus=xhci2.0,port=1,id=ohub",
"-device", "usb-hub,bus=xhci2.0,port=1.1,id=ihub",
"-device", "usb-kbd,bus=xhci2.0,port=1.1.1,id=nkbd"],
"qmp_sequence": [
{"delay": 8, "command": "device_del", "arguments": {"id": "ohub"}},
{"delay": 14, "command": "device_add",
"arguments": {"driver": "usb-hub", "bus": "xhci2.0", "port": "1", "id": "ohub2"}},
{"delay": 17, "command": "device_add",
"arguments": {"driver": "usb-hub", "bus": "xhci2.0", "port": "1.1", "id": "ihub2"}},
{"delay": 20, "command": "device_add",
"arguments": {"driver": "usb-kbd", "bus": "xhci2.0", "port": "1.1.1", "id": "nkbd2"}},
],
"expect": r"(?s)(?=.*hub device slot \d+ disconnected)"
r"(?=.*device-manager: reaping \S*usb-hid-keyboard[\s\S]*usb-hid-keyboard: ok)",
"fail": r"DANOS-TEST-RESULT: FAIL"},
# The kernel VFS root (M-F): the mount table serves the initrd at /system —
# path resolution, node status/read (an ELF magic), and directory listing,
# asserted kernel-side.