Red Hat Bugzilla – Bug 723858
usb: add companion controller support
Last modified: 2013-01-09 19:07:34 EST
Description of problem: EHCI handles USB 2.0 devices only and hands off USB 1.1 devices to one or more companion controllers. qemu should emulate companion controllers so we have a single usb bus which can handle both 1.1 and 2.0 devices instead of two completely separate busses, one for 1.1 and one for 2.0 devices.
This is a new feature, no need to reproduce, verify it on: ----------------------------------------------------------- qemu-kvm-0.12.1.2-2.184.el6.x86_64 2.6.32-191.el6.x86_64 Steps to verify: ------------------ 1.Boot guest with: #/usr/libexec/qemu-kvm -enable-kvm -M rhel6.2.0 -smp 4 -m 4G -name rhel6.1-64 -uuid 3f2ea5cd-3d29-48ff-aab2-23df1b6ae213 -drive file=RHEL-Server-6.1-64-virtio.qcow2,cache=none,if=none,rerror=stop,werror=stop,id=drive-virtio-disk0,format=qcow2 -device virtio-blk-pci,drive=drive-virtio-disk0,id=device-virtio-disk0,bootindex=1 -netdev tap,script=/etc/qemu-ifup,id=netdev0 -device virtio-net-pci,netdev=netdev0,id=device-net0 -boot order=cd,menu=on -monitor stdio -vnc :10 -readconfig ich9-ehci-uhci.cfg 2.In qemu monitor: device_add usb-tablet,bus=ehci.0,id=input0 device_add usb-hub,bus=ehci.0,id=usbhub0 device_add usb-host,hostbus=3,hostaddr=2,bus=ehci.0,id=camera Actual results: ----------------- In guest: #lsusb: Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 002: ID 045e:00f7 Microsoft Corp. LifeCam VX-1000 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 003: ID 0000:0000 Bus 002 Device 002: ID 0627:0001 Adomax Technology Co., Ltd Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub #lsusb -t Bus# 4 `-Dev# 1 Vendor 0x1d6b Product 0x0001 Bus# 3 `-Dev# 1 Vendor 0x1d6b Product 0x0001 `-Dev# 2 Vendor 0x045e Product 0x00f7 Bus# 2 `-Dev# 1 Vendor 0x1d6b Product 0x0001 |-Dev# 2 Vendor 0x0627 Product 0x0001 `-Dev# 3 Vendor 0x0000 Product 0x0000 Bus# 1 `-Dev# 1 Vendor 0x1d6b Product 0x0002 Conclusion: ------------ Based on results above, usb 1.1 devices are dropped to companion uhci controller correctly, verified.
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Part of the "USB 2.0 support" feature in 6.2.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2011-1531.html