qemu: device-sim bringup — boot smoke, A/B disk harness, virt kernel variant
The third simulator (deliberately not named "sim"): a QEMU -M virt VM that boots the real 6.18.46 kernel and enters at -kernel zImage — everything below (BootROM/idblock/U-Boot/real BCB A/B selection) is closed blobs + mask ROM and is explicitly out of scope. - qemu/mkinitramfs.sh: pinned static busybox (sha256 fail-closed) + rootfs/ - qemu/mkimage.sh: unprivileged sparse disk image with the device's canonical 12-partition blkdevparts A/B layout (vda == mmcblk0 mapping) - qemu/rootfs/: stage-1 init (by-name symlinks from PARTNAME uevents, whole-token warden.slot= parse, switch_root) + stage-2 init (userdata/oem mounts, slirp networking, payload daemon start) - qemu/run.sh: runner with --slot/--rtc/--watchdog/--rs485/--qmp/--display - qemu/configs/virt.fragment + WARDEN_KCONFIG_FRAGMENT hook in build/build-kernel.sh (canonical RV1106 build untouched when unset): adds PCI, pci-serial, i6300esb watchdog, WireGuard, virtio-gpu/input - qemu/tests/boot-smoke.sh: sentinel-asserting boot test Verified on QEMU 10.0.11: canonical zImage boots -M virt unmodified (the feared DEBUG_UNCOMPRESS decompressor hang does not exist in 6.18); full stack boots both slots; 12 by-name symlinks; userdata persists across reboot; -rtc base=2021-01-01 reproduces the no-RTC wrong-clock class. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018HUayid7W5w7jBdb9Rrj1K
This commit is contained in:
BFE Engineering
co-authored by
Claude Fable 5
Claude Fable 5
parent
44cdf2bf38
commit
bf3c93cf85
Executable
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#!/usr/bin/env bash
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# Build the VM's virtio disk image carrying the device's canonical 12-partition
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# A/B layout (qemu/blkdevparts.conf — the same string U-Boot and Linux parse on
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# hardware; there is no MBR/GPT). Every partition is placed at the exact offset
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# the cmdline string declares; rootfs_a/rootfs_b/oem_a/oem_b/userdata get ext4,
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# the boot-chain partitions (env/idblock/uboot/misc/boot_a/boot_b/recovery)
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# stay zeroed — the VM enters at -kernel and never reads them.
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#
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# Built entirely UNPRIVILEGED: per-partition mkfs.ext4 -d (no loop mounts, no
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# sudo), then dd'd into a sparse raw image.
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#
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# Usage: mkimage.sh [--portal-url URL] [--state KEY=VALUE]...
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# Env:
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# BUSYBOX path to a local busybox binary (skips the download; still verified)
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# OUT output dir (default: qemu/out); image at $OUT/disk.img
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set -euo pipefail
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QEMU_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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. "$QEMU_DIR/lib.sh"
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. "$QEMU_DIR/blkdevparts.conf"
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OUT="${OUT:-$QEMU_DIR/out}"
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# mkfs.ext4 lives in sbin, which user shells on Debian don't have on PATH.
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PATH="$PATH:/usr/sbin:/sbin"
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PORTAL_URL=""
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STATE_KV=()
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while [ $# -gt 0 ]; do
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case "$1" in
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--portal-url) PORTAL_URL="${2:?--portal-url needs a value}"; shift 2 ;;
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--state) STATE_KV+=("${2:?--state needs KEY=VALUE}"); shift 2 ;;
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*) echo "FATAL: unknown argument '$1' (usage: mkimage.sh [--portal-url URL] [--state KEY=VALUE]...)" >&2; exit 1 ;;
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esac
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done
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qemu_get_busybox
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SCRATCH="$(mktemp -d "${TMPDIR:-/tmp}/warden-qemu-image.XXXXXX")"
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trap 'rm -rf "$SCRATCH"' EXIT
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# Stage the rootfs tree once (skeleton + payload into /usr/bin), reused for
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# both slots so A and B start byte-identical, like a factory flash.
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ROOT="$SCRATCH/root"
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qemu_stage_rootfs "$ROOT"
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for p in "$QEMU_DIR"/payload/*; do
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[ -f "$p" ] || continue
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case "$(basename "$p")" in README.md) continue ;; esac
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install -m 0755 "$p" "$ROOT/usr/bin/$(basename "$p")"
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done
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# Seed persistent state (flared: one file per key under /userdata/warden).
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UDATA="$SCRATCH/userdata"
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mkdir -p "$UDATA/warden"
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[ -n "$PORTAL_URL" ] && printf '%s' "$PORTAL_URL" > "$UDATA/warden/flare.url"
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for kv in ${STATE_KV[@]+"${STATE_KV[@]}"}; do
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printf '%s' "${kv#*=}" > "$UDATA/warden/${kv%%=*}"
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done
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mkdir -p "$SCRATCH/empty"
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# mkfs an ext4 partition image of exactly $2 bytes from staged dir $1.
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mkfs_part() {
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local stage="$1" bytes="$2" img="$3"
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rm -f "$img"
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truncate -s "$bytes" "$img"
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mkfs.ext4 -F -q -d "$stage" "$img"
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}
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DISK="$OUT/disk.img"
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rm -f "$DISK"
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place_partition() {
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local name="$1" off="$2" size="$3" stage=""
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case "$name" in
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rootfs_a|rootfs_b) stage="$ROOT" ;;
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userdata) stage="$UDATA" ;;
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oem_a|oem_b) stage="$SCRATCH/empty" ;;
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*) stage="" ;; # boot-chain partition: left zeroed
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esac
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# dd in 4K blocks — every offset in the canonical layout is 4K-aligned;
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# assert rather than assume, a misaligned write would corrupt a neighbor.
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[ $((off % 4096)) -eq 0 ] && [ $((size % 4096)) -eq 0 ] || {
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echo "FATAL: partition $name not 4K-aligned (off=$off size=$size)" >&2
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exit 1
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}
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DISK_END=$((off + size))
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[ -z "$stage" ] && return 0
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local img="$SCRATCH/$name.img"
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mkfs_part "$stage" "$size" "$img"
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dd if="$img" of="$DISK" bs=4096 seek=$((off / 4096)) \
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conv=notrunc,sparse status=none
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qemu_log " $name: ext4, $((size / 1048576))M @ $off"
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}
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DISK_END=0
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qemu_log "building $DISK ($WARDEN_BLKDEVPARTS)"
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truncate -s 0 "$DISK"
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qemu_each_partition place_partition
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truncate -s "$DISK_END" "$DISK"
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qemu_log "disk image: $DISK ($(du -h "$DISK" | cut -f1) used, $((DISK_END / 1048576))M apparent)"
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