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Message #14726
[Bug 1246929] Re: no audio in KVM virtual machines : cannot select alsa or pa
the emulated HDA works fine in Windows 7 VM using the above, with proviso that I run VM as root, ie.
/etc/libvirt/qemu.conf includes (in my case, which works)
user = "root"
group = "root"
cgroup_device_acl = [
"/dev/null", "/dev/full", "/dev/zero",
"/dev/random", "/dev/urandom",
"/dev/ptmx", "/dev/kvm", "/dev/kqemu",
"/dev/rtc","/dev/hpet", "/dev/vfio/vfio",
"/dev/vfio/1", "/dev/vfio/14", "/dev/vfio/15", "/dev/vfio/16", "/dev/vfio/17",
"/dev/shm", "/root/.config/pulse", "/dev/snd",
]
nographics_allow_host_audio = 1
security_require_confined = 0
hugetlbfs_mount = "/dev/hugepages"
clear_emulator_capabilities = 0
relaxed_acs_check = 1
If using VNC rather than Spice, you may also need
vnc_allow_host_audio = 1
and /etc/apparmor.d/abstractions/libvirt/qemu contains the following additional lines (in my case)
/{dev,run}/shm/pulse-shm* rw,
@{HOME}/.config/puls** rwk,
@{HOME}/** r,
/root/.config/puls** rwk,
/root/.asoundrc r,
/dev/vfio/* rw,
This works nicely with a Windows 7 guest using the following xml (where a graphics card is apssed through at 01:00.0 and a USB card is passed at 02:00.0, note that the inbuilt audio device on the graphics card is NOT passed through i'ts still attached to pci-stub)
!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
virsh edit ssd-win7
or other application using the libvirt API.
-->
<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
<name>ssd-win7</name>
<uuid>92faa169-292a-4086-a398-31df57266eb1</uuid>
<memory unit='KiB'>6291456</memory>
<currentMemory unit='KiB'>6291456</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-q35-2.0'>hvm</type>
<loader>/mnt/programming_data/virtualisation/bios/bios.bin</loader>
<boot dev='hd'/>
<bootmenu enable='yes'/>
</os>
<features>
<acpi/>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='4096'/>
</hyperv>
</features>
<cpu mode='custom' match='exact'>
<model fallback='allow'>Haswell</model>
<topology sockets='1' cores='2' threads='1'/>
</cpu>
<clock offset='localtime'/>
<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/ssd-virt/lvwin7_kvm'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x04' function='0x0'/>
</disk>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x03' function='0x0'/>
</controller>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pcie-root'/>
<controller type='pci' index='1' model='dmi-to-pci-bridge'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1e' function='0x0'/>
</controller>
<controller type='pci' index='2' model='pci-bridge'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x01' function='0x0'/>
</controller>
<interface type='user'>
<mac address='00:00:00:0a:5b:2c'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
</interface>
<input type='tablet' bus='usb'/>
<sound model='ac97'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
</sound>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x05' function='0x0'/>
</memballoon>
</devices>
<qemu:commandline>
<qemu:arg value='-rtc'/>
<qemu:arg value='base=localtime'/>
<qemu:arg value='-nodefconfig'/>
<qemu:arg value='-device'/>
<qemu:arg value='nec-usb-xhci,id=xhci'/>
<qemu:arg value='-spice'/>
<qemu:arg value='port=5902,disable-ticketing'/>
<qemu:arg value='-device'/>
<qemu:arg value='ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1'/>
<qemu:arg value='-device'/>
<qemu:arg value='ioh3420,bus=pcie.0,addr=1c.1,multifunction=on,port=2,chassis=2,id=root.2'/>
<qemu:arg value='-device'/>
<qemu:arg value='ich9-intel-hda,bus=root.2'/>
<qemu:arg value='-device'/>
<qemu:arg value='hda-duplex,bus=hda.0'/>
<qemu:arg value='-device'/>
<qemu:arg value='usb-ehci,id=ehci'/>
<qemu:arg value='-device'/>
<qemu:arg value='vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on'/>
<qemu:arg value='-device'/>
<qemu:arg value='vfio-pci,host=02:00.0,bus=pcie.0'/>
<qemu:arg value='-device'/>
<qemu:arg value='ahci,bus=pcie.0,id=ahci'/>
<qemu:env name='DISPLAY' value=':0'/>
<qemu:env name='QEMU_ALSA_DAC_BUFFER_SIZE' value='512'/>
<qemu:env name='QEMU_ALSA_DAC_PERIOD_SIZE' value='100'/>
<qemu:env name='QEMU_AUDIO_DRV' value='alsa'/>
</qemu:commandline>
</domain>
If you'd rather grant access at the VM level you can update the apparmor entries in /etc/apparmor.d/libvirt/libivrt-<uuid>
What worked best for me was to create a new permissions file based on the "libvirt-<uuid>.files" entry which was autmatically generated. The new file contains the following
# Added by R E to support use of VFIO.
"/dev/vfio/*" rw,
# Needed for ALSA sound (based on error messages about not having access).
"/dev/shm/pulse-shm*" rwk,
"/run/shm/pulse-shm*" rwk,
"/root/.config/puls**" rwk,
"/root/.asoundrc" r,
# Rather than specifying individual files, allow the whole directory
"/mnt/programming_data/isos/**" r,
# don't audit writes to readonly files
deny "/mnt/programming_data/isos/**" w,
Then add a pointer to that file in the master at "libvirt-<uuid>" ie. to
look like this (see the last entry, the file which i created)
#
# This profile is for the domain whose UUID matches this file.
#
#include <tunables/global>
profile libvirt-c1a86cb2-82b4-4db9-89c2-ced5be57b39e {
#include <abstractions/libvirt-qemu>
#include <libvirt/libvirt-c1a86cb2-82b4-4db9-89c2-ced5be57b39e.files>
#include <libvirt/libvirt-c1a86cb2-82b4-4db9-89c2-ced5be57b39e.files_re>
}
For some reason, when I do the same for a Ubuntu Trusty VM it initially worked but now shows a "device busy" error for some reason, which i'm unable to overcome - even though a Windows VM operating in exactly the same manner works fine. Arcane magic involved - sacrifice may be required
Both the AC97 and the HDA devices work on Windows ie. go into Control Panel / Sound and select one, run a test and it works fine. Neither of them is a PCI pasthrough card. As it happens I have a separate USB soundcard I can use in Windows because it's attached to the USB controller with is passed through via PCI passthrough, but that's a spearate story.
In my situation, the host is Ubuntu Trusty running kvm, qemu, libvirt
and virt-manager from the standard repos. The kernel is patched to
support VGA passthrough (mostly to deal with Intel graphics poor
handling of VGA arbitration)
Have you tried this arrangement ?
--
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https://bugs.launchpad.net/bugs/1246929
Title:
no audio in KVM virtual machines : cannot select alsa or pa
Status in “libvirt” package in Ubuntu:
Confirmed
Status in “pulseaudio” package in Ubuntu:
Confirmed
Status in “virt-manager” package in Ubuntu:
Confirmed
Bug description:
I am on Ubuntu 13.10 desktop
16GB ram
asus sabertooth 990fx r2.0 motherboard
amd 8346 cpu
nvidia gtx650 video card
Since upgrading to Ubuntu 13.10 audio no longer works in KVM.
Checking SYSLOG I found this error being logged:
Oct 31 15:32:31 bmullan-virtual-machine pulseaudio[1814]: [alsa-source-ID 21 Analog] alsa-source.c: ALSA woke us up to read new data from the device, but there was actually nothing to read!
Oct 31 15:32:31 bmullan-virtual-machine pulseaudio[1814]: [alsa-source-ID 21 Analog] alsa-source.c: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA developers.
Oct 31 15:32:31 bmullan-virtual-machine pulseaudio[1814]: [alsa-source-ID 21 Analog] alsa-source.c: We were woken up with POLLIN set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
brian
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.11.0-11.17-generic 3.11.3
Uname: Linux 3.11.0-11-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Thu Oct 31 19:45:53 2013
InstallationDate: Installed on 2013-10-31 (0 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Beta amd64 (20131003)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/09/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1708
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: SABERTOOTH 990FX R2.0
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1708:bd04/09/2013:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnSABERTOOTH990FXR2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: To be filled by O.E.M.
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