kvm on arm64

[Ross Vandegrift <rvandegrift@debian.org>]

(please CC me, as I'm not subscribed)

Hi folks,

New to running arm64 stuff on physical arm64 hardware, and I'm unable to start
a kvm guest.  I'm sure I'm missing something, hoping someone can point me in
the right direction.

I'm running arm64 bookworm (plus vendor junk for orangepi 5 plus).  Without
kvm, I can boot a trixie arm64 image [1] just fine.  But if I enable kvm, qemu
spins without booting.  It produces no output, not even the UEFI firmware
output.

This works:

dd if=/dev/zero of=flash1.img bs=1M count=64
dd if=/dev/zero of=flash0.img bs=1M count=64
dd if=/usr/share/qemu-efi-aarch64/QEMU_EFI.fd of=flash0.img conv=notrunc
qemu-system-aarch64 \
    -nographic \
    -machine virt,gic-version=max \
    -m 512M \
    -cpu max \
    -netdev user,id=vnet \
    -device virtio-net-pci,netdev=vnet \
    -drive file=debian-13-nocloud-arm64-daily-20230809-1467.qcow2,if=none,id=drive0 \
    -device virtio-blk,drive=drive0,bootindex=0 \
    -drive file=flash0.img,format=raw,if=pflash \
    -drive file=flash1.img,format=raw,if=pflash \
    -snapshot


But it breaks if I add -enable-kvm.  Any hints?

Thanks,
Ross

[1] - https://cloud.debian.org/images/cloud/trixie/daily/20230809-1467/debian-13-nocloud-arm64-daily-20230809-1467.qcow2