usb keyboard and mouse can't work on QEMU ARM64 with KVM

[Shannon Zhao]

Hi，

Recently I'm trying to use usb keyboard and mouse with QEMU on ARM64. Below is my QEMU command line,
host and guest kernel both are 4.7.0-rc7+, and I ran it on Hikey board.

    qemu-system-aarch64 \
    -smp 1 -cpu host -enable-kvm \
    -m 256 -M virt \
    -k en-us \
    -nographic \
    -device usb-ehci -device usb-kbd -device usb-mouse -usb\
    -kernel Image \
    -initrd guestfs.cpio.gz \
    -append "rdinit=/sbin/init console=ttyAMA0 root=/dev/ram earlycon=pl011,0x9000000 rw"

The following guest log shows that usb controller can be probed but the keyboard and mouse can't be
found.

[    1.597433] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    1.599562] ehci-pci: EHCI PCI platform driver
[    1.608082] ehci-pci 0000:00:03.0: EHCI Host Controller
[    1.609485] ehci-pci 0000:00:03.0: new USB bus registered, assigned bus number 1
[    1.611833] ehci-pci 0000:00:03.0: irq 49, io mem 0x10041000
[    1.623599] ehci-pci 0000:00:03.0: USB 2.0 started, EHCI 1.00
[    1.625867] hub 1-0:1.0: USB hub found
[    1.626906] hub 1-0:1.0: 6 ports detected
[    1.628685] ehci-platform: EHCI generic platform driver
[    1.630263] ehci-msm: Qualcomm On-Chip EHCI Host Controller
[    1.631947] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    1.633547] ohci-pci: OHCI PCI platform driver
[    1.634807] ohci-platform: OHCI generic platform driver
[...]
[    1.939001] usb 1-1: new high-speed USB device number 2 using ehci-pci
[   17.467040] usb 1-1: device not accepting address 2, error -110
[   17.579165] usb 1-1: new high-speed USB device number 3 using ehci-pci
[   32.287242] random: dd urandom read with 7 bits of entropy available
[   33.110970] usb 1-1: device not accepting address 3, error -110
[   33.223030] usb 1-1: new high-speed USB device number 4 using ehci-pci
[   43.635185] usb 1-1: device not accepting address 4, error -110
[   43.747033] usb 1-1: new high-speed USB device number 5 using ehci-pci
[   54.159043] usb 1-1: device not accepting address 5, error -110
[   54.160752] usb usb1-port1: unable to enumerate USB device
[   54.307290] usb 1-2: new high-speed USB device number 6 using ehci-pci
[   69.839052] usb 1-2: device not accepting address 6, error -110
[   69.951249] usb 1-2: new high-speed USB device number 7 using ehci-pci
[   85.483171] usb 1-2: device not accepting address 7, error -110
[   85.595035] usb 1-2: new high-speed USB device number 8 using ehci-pci
[   90.619247] usb 1-2: device descriptor read/8, error -110
[   95.743482] usb 1-2: device descriptor read/8, error -110
[   95.959165] usb 1-2: new high-speed USB device number 9 using ehci-pci
[  106.371177] usb 1-2: device not accepting address 9, error -110
[  106.372894] usb usb1-port2: unable to enumerate USB device

lsusb shows:
root at genericarmv8:~# lsusb
Bus 001 Device 001: ID 1d6b:0002

Besides, I have also tried QEMU TCG without KVM. The guest can successfully probe usb controller,
keyboard and mouse.
lsusb shows:
root at genericarmv8:~# lsusb
Bus 001 Device 002: ID 0627:0001
Bus 001 Device 003: ID 0627:0001
Bus 001 Device 001: ID 1d6b:0002

So it looks like that usb keyboard and mouse don't work with KVM on QEMU ARM64 while they can work
with TCG. IIUC, all the usb devices are emulated by QEMU, it has nothing with KVM. So it really
confused me and I'm not familiar with usb devices. Also I have seen someone else reports this issue
before[1].

[1]https://lists.gnu.org/archive/html/qemu-arm/2016-06/msg00110.html

Any comments and help are welcome. Thanks in advance.

Thanks,
-- 
Shannon