Bug 1438682

v1 posted upstream:
https://www.redhat.com/archives/libvir-list/2017-April/msg00958.html

Upstream commits:

commit 278e70f8f8bac9e6482099d7f3f1a7a8f2109b5f
Author: Pavel Hrdina <phrdina>
Date:   Thu Apr 13 12:25:25 2017 +0200

    qemu: add support for qemu-xhci USB controller

commit 568887a32f9985b95d998dd0d675255ea985013f
Author: Pavel Hrdina <phrdina>
Date:   Thu Apr 27 17:56:41 2017 +0200

    qemu: use qemu-xhci USB controller by default for ppc64 and aarch64

Verify it on libvirt-3.2.0-6.virtcov.el7.x86_64 qemu-kvm-rhev-2.9.0-7.el7.x86_64
1. Test the max ports of qemu-xhci
Edit a VM, set qemu-xhci ports as 16 and save it:
<controller type='usb' index='0' model='qemu-xhci' ports='16'/>

error: unsupported configuration: 'qemu-xhci' controller only supports up to '15' ports
Failed. Try again? [y,n,i,f,?]: 

Then set ports as 15, attach 15 disks to the usb controller:
+ sudo virsh attach-disk pc /exports/sda.img sda --targetbus usb
Disk attached successfully
+ sudo virsh attach-disk pc /exports/sdb.img sdb --targetbus usb
Disk attached successfully
....
+ sudo virsh attach-disk pc /exports/sdp.img sdp --targetbus usb
Disk attached successfully

Check all disks are in guest. Then detech them:
+ sudo virsh detach-disk pc sda
Disk detached successfully
+ sudo virsh detach-disk pc sdb
Disk detached successfully
...
+ sudo virsh detach-disk pc sdp
Disk detached successfully


2. Start a guest with following devices(disk, hostdev, mouse, keyboard, tablet, hub, redirdev) attach to qemu-xhci controller:
...
<disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/exports/raw'/>
      <target dev='sda' bus='usb'/>
      <address type='usb' bus='0' port='2'/>
    </disk>
<hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <vendor id='0x0930'/>
        <product id='0x6545'/>
      </source>
      <address type='usb' bus='0' port='6'/>
    </hostdev>
<input type='mouse' bus='usb'>
      <address type='usb' bus='0' port='3'/>
    </input>
<input type='keyboard' bus='usb'>
      <address type='usb' bus='0' port='4'/>
    </input>
<input type='tablet' bus='usb'>
      <address type='usb' bus='0' port='5'/>
    </input>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
<rng model='virtio'>
      <backend model='random'>/dev/urandom</backend>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </rng>
<hub type='usb'>
      <address type='usb' bus='0' port='7'/>
    </hub>
...
Check all devices works well.

Migrate the guest to RHEL7.3 host:
# virsh migrate pc qemu+ssh://xxxxx/system --verbose --unsafe
root.eng.pek2.redhat.com's password: 
error: unsupported configuration: Unknown model type 'qemu-xhci'

Migrate the guest to RHEL7.4 host:
# virsh migrate pc qemu+ssh://xxx/system --verbose --unsafe
Migration: [100 %]

gsun, please check if the controller works well on ppc. Thks.

Test with 
libvirt-libs-3.2.0-7.el7.ppc64le
qemu-kvm-rhev-2.9.0-7.el7.ppc64le

1. Test the max ports of qemu-xhci
Edit a VM, set qemu-xhci ports as 16 and save it:
<controller type='usb' index='0' model='qemu-xhci' ports='16'/>

error: unsupported configuration: 'qemu-xhci' controller only supports up to '15' ports
Failed. Try again? [y,n,i,f,?]: 

2. set ports as 15, attach 13 disks to the usb controller (2 left for usb mouse and usb keyboard)
# virsh attach-disk vm1 /home/test/sda.img sda --targetbus usb --sub-driver qcow2
Disk attached successfully
...

Check all disks are working well in guest. Then detech them ok.

3. Start a guest with following devices(disk, hostdev, mouse, keyboard, tablet, hub, redirdev) attach to qemu-xhci controller 
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/home/dzheng/sd2'/>
      <backingStore/>
      <target dev='sda' bus='usb'/>
      <alias name='usb-disk0'/>
      <address type='usb' bus='0' port='3'/>
    </disk>
    <input type='tablet' bus='usb'>
      <alias name='input0'/>
      <address type='usb' bus='0' port='5'/>
    </input>
    <input type='keyboard' bus='usb'>
      <alias name='input1'/>
      <address type='usb' bus='0' port='1'/>
    </input>
    <input type='mouse' bus='usb'>
      <alias name='input2'/>
      <address type='usb' bus='0' port='2'/>
    </input>
    <hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <vendor id='0x1d6b'/>
        <product id='0x0003'/>
        <address bus='2' device='1'/>
      </source>
      <alias name='hostdev0'/>
      <address type='usb' bus='0' port='6'/>
    </hostdev>
    <hub type='usb'>
      <alias name='hub0'/>
      <address type='usb' bus='0' port='7'/>
    </hub>
Check all devices works well.

4. Migrate
Migrate the guest to RHEL7.3 host:
# virsh migrate vm1 qemu+ssh://xxxxx/system --verbose --unsafe
...
error: unsupported configuration: Unknown model type 'qemu-xhci'

Migrate the guest to RHEL7.4 host:
# virsh migrate vm1 qemu+ssh://xxx/system --verbose --unsafe
Migration: [100 %]


PASS.

Since tests passed in comment10 and comment12, mark it as verified.

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.

https://access.redhat.com/errata/RHEA-2017:1846

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.

https://access.redhat.com/errata/RHEA-2017:1846