Comment 0 for bug 1855840

Host:
Debian10
qemu-efi: 0~20181115.85588389-3
qemu-system-aarch64: QEMU emulator version 3.1.0 (Debian 1:3.1+dfsg-8+deb10u3)
libvirt: 5.0.0

Booting vm with kernel cmd param "earlycon=pl011,0x9000000", it hangs:
[ 0.000000] Virtual kernel memory layout: [ 0.000000] vmalloc : 0xffff000000000000 - 0xffff7bffbfff0000 (126974 GB)
[ 0.000000] vmemmap : 0xffff7bffc0000000 - 0xffff7fffc0000000 ( 4096 GB maximum)
[ 0.000000] 0xffff7bffc0000000 - 0xffff7bffc0800000 ( 8 MB actual)
[ 0.000000] fixed : 0xffff7ffffa7fd000 - 0xffff7ffffac00000 ( 4108 KB)
[ 0.000000] PCI I/O : 0xffff7ffffae00000 - 0xffff7ffffbe00000 ( 16 MB)
[ 0.000000] modules : 0xffff7ffffc000000 - 0xffff800000000000 ( 64 MB)
[ 0.000000] memory : 0xffff800000000000 - 0xffff800020000000 ( 512 MB)
[ 0.000000] .init : 0xffff800000cb8000 - 0xffff800000d76000 ( 760 KB)
[ 0.000000] .text : 0xffff800000080000 - 0xffff800000cb8000 ( 12512 KB)
[ 0.000000] .data : 0xffff800000d87000 - 0xffff800000e84200 ( 1013 KB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] Build-time adjustment of leaf fanout to 64.
[ 0.000000] RCU restricting CPUs from NR_CPUS=128 to nr_cpu_ids=1.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=1
[ 0.000000] NR_IRQS:64 nr_irqs:64 0
[ 0.000000] Kernel panic - not syncing: No interrupt controller found.
[ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.0-28-generic #47-Ubuntu
[ 0.000000] Hardware name: (null) (DT)
[ 0.000000] Call trace:
[ 0.000000] [<ffff80000008a780>] dump_backtrace+0x0/0x1b0
[ 0.000000] [<ffff80000008a954>] show_stack+0x24/0x30
[ 0.000000] [<ffff800000459b3c>] dump_stack+0x98/0xbc
[ 0.000000] [<ffff8000001cc1b8>] panic+0xf8/0x23c
[ 0.000000] [<ffff800000cbba28>] init_IRQ+0x24/0x2c
[ 0.000000] [<ffff800000cb88b0>] start_kernel+0x2a0/0x414
[ 0.000000] [<00000000408fd000>] 0x408fd000
[ 0.000000] ---[ end Kernel panic - not syncing: No interrupt controller found.