x86_64/qemu: add an Asterinas root-zone boot mode#341
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…and use an absolute initramfs output path
dev moved to Kconfig-based board config while this branch was open. Rebased and carried aster_guest forward as a proper Kconfig entry (kconfig/Kconfig + cfg_map.toml) instead of a bare Cargo feature, and pointed run_asterinas.sh at the new "make defconfig" + .config flow since the old FEATURES= build argument no longer exists upstream. No functional changes; qemu/asterinas boot flow re-verified after the rebase.
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This adds a way to boot Asterinas instead of Linux as the root zone on the
existing
qemuboard, plus a small package of guest-side probes used tosanity-check scheduling/IPI/timer behavior once it was up.
board.rs/platform.mk: newaster_guesttoggle. When set, selectsthe Asterinas kernel cmdline, a CPIO initramfs, and adds the
corresponding GRUB entry. Off by default.
platform/x86_64/qemu/asterinas/: the probe package —smp_probe,ipi_pingpong,timer_jitter,ctxsw, plus the scripts that build/runthem and a self-test init used by
run_asterinas.shto confirm the guestactually came up cleanly rather than just "QEMU didn't crash."
aster_guest, a CHANGELOG line.This only really works correctly once the four fixes opened separately in
this queue land — LA57 MMIO decoding, the CPUID/TSC caching, the multiboot
copy-ordering fix, and the q35 PCI window correction all get exercised by
bringing this guest up. They're split out because each stands on its own,
but this PR's diff includes them too since it can't honestly be claimed to
boot without them. Happy to shrink this down once those merge.
Booted this end-to-end under QEMU/KVM three separate times to make sure it
wasn't a fluke: reaches a working BusyBox shell every time, the self-check
reports correct uname/cpu-count/meminfo/rootfs, and prints
asterinas-on-hvisor-okat the end. Build and format checks clean bothwith the toggle on and off.