[vfio-users] No hdmi audio on AMD R7 370 w/ libvirt

[Brian Chow]

I converted my Win10 VM over to a full libvirt VM, removing qemu command
line args from the XML, and I no longer have functioning HDMI audio.  The
device shows up in device manager as OK, and it detects my monitor as the
speakers, which is also correct, but no audio plays, when and when I
attempt to to configure the speakers/test the audio, I get a message that
the test tone cannot be played.  Does anyone know what I need to tweak to
get it working again?  I moved off the qemu command args style because a
system/libvirt/qemu update a while ago changed how the permissions were
working and that broke passthrough for me.  I also saw Alex recommend not
using qemu command args a while back.  Video passthrough IS working.

Thanks in advance!

My XML is as follows:

<domain type='kvm' id='3'>  <name>starscream</name>
<uuid>d18b5dce-5bdf-4db7-87b6-e0c6b2479b0f</uuid>  <memory
unit='KiB'>7813120</memory>  <currentMemory
unit='KiB'>7812500</currentMemory>  <memoryBacking>    <hugepages/>
</memoryBacking>  <vcpu placement='static' current='2'>4</vcpu>
<cputune>    <vcpupin vcpu='0' cpuset='2'/>    <vcpupin vcpu='1'
cpuset='3'/>    <vcpupin vcpu='2' cpuset='6'/>    <vcpupin vcpu='3'
cpuset='7'/>  </cputune>  <resource>
<partition>/machine</partition>  </resource>  <os>    <type
arch='x86_64' machine='pc-i440fx-2.4'>hvm</type>    <loader
readonly='yes' type='pflash'>/usr/share/OVMF/OVMF-pure-efi.fd</loader>
   <nvram template='/kvm/starscream/OVMF-starscream.fd'>/var/lib/libvirt/qemu/nvram/starscream_VARS.fd</nvram>
   <bootmenu enable='yes'/>  </os>  <features>    <acpi/>    <hyperv>
    <relaxed state='on'/>      <vapic state='on'/>      <spinlocks
state='on' retries='8191'/>    </hyperv>    <kvm>      <hidden
state='on'/>    </kvm>  </features>  <cpu mode='host-passthrough'>
<topology sockets='1' cores='2' threads='2'/>  </cpu>  <clock
offset='variable' adjustment='-28801' basis='utc'>    <timer
name='hypervclock' present='yes'/>  </clock>
<on_poweroff>destroy</on_poweroff>  <on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>  <devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>    <disk type='block'
device='disk'>      <driver name='qemu' type='raw'/>      <source
dev='/dev/zvol/htpc/vm/starscream1'/>      <backingStore/>
<target dev='vda' bus='virtio'/>      <boot order='1'/>      <alias
name='virtio-disk0'/>      <address type='pci' domain='0x0000'
bus='0x00' slot='0x07' function='0x0'/>    </disk>    <disk
type='block' device='disk'>      <driver name='qemu' type='raw'/>
<source dev='/dev/zvol/htpc/vm/starscream2'/>      <backingStore/>
 <target dev='vdb' bus='virtio'/>      <alias name='virtio-disk1'/>
  <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>    </disk>    <disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>      <backingStore/>      <target
dev='hda' bus='ide'/>      <readonly/>      <alias name='ide0-0-0'/>
   <address type='drive' controller='0' bus='0' target='0' unit='0'/>
  </disk>    <disk type='file' device='cdrom'>      <driver
name='qemu' type='raw'/>      <backingStore/>      <target dev='hdb'
bus='ide'/>      <readonly/>      <alias name='ide0-0-1'/>
<address type='drive' controller='0' bus='0' target='0' unit='1'/>
</disk>    <controller type='usb' index='0' model='piix3-uhci'>
<alias name='usb'/>      <address type='pci' domain='0x0000'
bus='0x00' slot='0x01' function='0x2'/>    </controller>
<controller type='pci' index='0' model='pci-root'>      <alias
name='pci.0'/>    </controller>    <controller type='ide' index='0'>
   <alias name='ide'/>      <address type='pci' domain='0x0000'
bus='0x00' slot='0x01' function='0x1'/>    </controller>
<controller type='virtio-serial' index='0'>      <alias
name='virtio-serial0'/>      <address type='pci' domain='0x0000'
bus='0x00' slot='0x02' function='0x0'/>    </controller>
<controller type='sata' index='0'>      <alias name='sata0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>    </controller>    <interface type='bridge'>
<mac address='52:54:00:f7:64:f4'/>      <source bridge='br0'/>
<target dev='vnet0'/>      <model type='virtio'/>      <alias
name='net0'/>      <address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>    </interface>    <console type='pty'
tty='/dev/pts/2'>      <source path='/dev/pts/2'/>      <target
type='virtio' port='0'/>      <alias name='console0'/>    </console>
 <input type='mouse' bus='ps2'>      <alias name='input0'/>
</input>    <input type='keyboard' bus='ps2'>      <alias
name='input1'/>    </input>    <hostdev mode='subsystem' type='pci'
managed='yes'>      <driver name='vfio'/>      <source>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</source>      <alias name='hostdev0'/>      <rom bar='on'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08'
function='0x0' multifunction='on'/>    </hostdev>    <hostdev
mode='subsystem' type='pci' managed='yes'>      <driver name='vfio'/>
    <source>        <address domain='0x0000' bus='0x01' slot='0x00'
function='0x1'/>      </source>      <alias name='hostdev1'/>
<rom bar='on'/>      <address type='pci' domain='0x0000' bus='0x00'
slot='0x09' function='0x0' multifunction='on'/>    </hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>      <driver
name='vfio'/>      <source>        <address domain='0x0000' bus='0x05'
slot='0x00' function='0x0'/>      </source>      <alias
name='hostdev2'/>      <address type='pci' domain='0x0000' bus='0x00'
slot='0x0a' function='0x0'/>    </hostdev>    <memballoon
model='virtio'>      <alias name='balloon0'/>      <address type='pci'
domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</memballoon>  </devices>  <seclabel type='none' model='none'/>
<seclabel type='dynamic' model='dac' relabel='yes'>
<label>+1000:+78</label>    <imagelabel>+1000:+78</imagelabel>
</seclabel></domain>
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