x86_64/qemu: boot Asterinas as the root zone#353
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Add x86_64 support needed to boot Asterinas as a root zone and keep CPUID, HPET, trap, and IOAPIC state scoped by zone.
Add build-time selection for the Asterinas root zone and map the q35 ECAM window used for PCI config space enumeration.
…ebase build.rs detected asterinas_root via the Cargo-injected CARGO_FEATURE_ASTERINAS_ROOT env var, which stops existing once the feature moves out of Cargo.toml. Switched the check to the already-parsed .config enabled-set (same one gen_cargo_config/build.rs now use for everything else) and added ASTERINAS_ROOT to kconfig/Kconfig + cfg_map.toml so the board.rs cfg gates keep resolving. Re-tested with the staged Asterinas image; initrd size still comes out to the correct byte count.
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asterinas_roottoggle. Boots Asterinas via the Linux/x86 bootprotocol as the qemu board's root zone instead of Linux.
Cargo.toml/board.rs: toggle selects Asterinas cmdline, multiboot2initramfs, PCI ECAM base.
build.rs: validates the staged boot artifacts when the toggle is on —setup/vmlinux/initramfs all present, initramfs is an uncompressed newc
cpio (checks magic
070701/070702), size fits the 32-bitramdisk_sizeboot-protocol field. Computes the real initramfs bytelength at build time and writes it as
ASTERINAS_ROOT_INITRD_SIZEsoboard.rsdoesn't need a hand-maintained constant.asterinas_root.Depends on two PRs opened separately: the CPUID/boot/IOAPIC hardening pass
and the VT-d/VirtIO/mapper fixes above — nothing in this PR itself, but
they land on files this one also touches.
Verified:
make ARCH=x86_64 BOARD=qemu MODE=release alltoggle off and on;cargo fmt --all -- --checkclean. With the toggle on,ASTERINAS_ROOT_INITRD_SIZEmatches the staged file's real size on diskexactly. Booted under QEMU/KVM with keystroke injection to prove it's
actually interactive — ran
echoanduname -ain the guest shell, outputmatched.