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Re: [libvirt-users] Audio in Windows 10 VM is distorted. Using ALSA.
by Žilvinas Žaltiena 21 Dec '16

21 Dec '16

Hi, I found the main reason for sound distortions on my system is guest timer configuration. The working one is: <clock offset="localtime"> <timer name="hypervclock" present="yes"/> <timer name="hpet" present="no"/> <timer name="rtc" present="yes" track="guest" tickpolicy="delay"/> </clock> ... <qemu:commandline>a <qemu:arg value='-machine'/> <qemu:arg value='kernel_irqchip=on'/> <qemu:arg value='-cpu'/> <qemu:arg value='host,migratable=no,+invtsc,hv_time,+kvm_pv_eoi,hv_relaxed,hv_spinlocks=0x1fff,hv_vendor_id=nv_fuck_you!,kvm=off'/> </qemu:commandline> The important part here is "host,migratable=no,+invtsc". It gives guest the invariant TSC (CPU must support it). This is a bit of a hack. Everything, except migratable=no, can be configured through proper XML elements, however +invtsc requires migratable=no, and I don't know a way to pass it other than using qemu:arg. Note it completely overrides qemus -cpu parameter created from other tags. Don't paste my qemu:arg of it. Run your VM without it, check libvirt log, and copy from it what is passed to qemu as -cpu parameter, then add migratable=no,+invtsc. 2016-12-20 4:41 GMT+02:00 Manuel Ullmann <ullman.alias(a)posteo.de>: > Hi, > > I can’t seem to find a solution for my last VM issue. > I have distorted sound, when I play the Windows 10 device test > sound. Only the Windows sound is affected. Mpd of the host is playing just > fine > meanwhile. I am using ich9 as emulated card, which is detected and > installed correctly. The VM is using vfio-igd passthrough, so vnc or > spice are not used. > I tried to match the Windows driver configuration, which only supports > 16 bit output. I have a 24 bit USB headphone amplifier, which does not > support it (S32_LE only). Trying direct playback on the PCH card jack > did not help though. > > The headphone amplifier is connected via optical Toslink, so there is > standard snd_hda_intel output used (snd_usb_audio is not involved). > Passing the USB part through I get much clearer output, but still have > popping sounds. Googling around, they seem to be quite common on Windows > 10, although I had it working fine on two bare-metal machines. > > I have tried fixed settings matching the ones of the dmixed device > too. Don’t know, what is polled with enabled poll option. I also tried > sdl and pulseaudio, which did not help. For the latter not so surprising > since it is an Alsa pipe. The former was worse. > > The goal of this setup is having the same playlist state on both > systems and using the better audio framework for music playback (Windows > uses > too much software layers). Of course the popping sounds on audio device > passthrough also would be annoying, but that might be a different issue. > > Best regards, > Manuel > > used alsa device: > pcm.dmixed { > type asym > playback.pcm { > # See plugin:dmix at http://www.alsa-project.org/ > alsa-doc/alsa-lib/pcm_plugins.html > type dmix > > # Don't block other users, e.g. the Timidity midi-player > daemon > # http://www.alsa-project.org/ > alsa-doc/alsa-lib/pcm_plugins.html > ipc_key_add_uid false > > ipc_key 1025 > ipc_perm 0660 > ipc_gid audio > > # Don't put the rate here! Otherwise it resets the rate & > channels set below, as shown by: cat /proc/asound/card0/pcm0p/sub0/ > hw_params > slave { > # 2 for stereo, 6 for surround51, 8 for surround71 > channels 2 > pcm { > format S16_LE > #format S32_LE > > #rate 44100 > rate 48000 > > # http://www.alsa-project.org/ > alsa-doc/alsa-lib/pcm_plugins.html > # Maybe helps > nonblock true > type hw > card "PCH" > device 0 > subdevice 0 > } > > # mplayer2 chooses 1024 > # period_size 512 with buffer_size 16384 stops > crackling in xmame > # 320 breaks flash - https://bbs.archlinux.org/ > viewtopic.php?id=129458 > #period_size 512 > period_size 1024 > > # 4096 might make sound crackle > # mplayer2 chooses 8192. Half-Life 2 chooses 16384. > # If too large, use CONFIG_SND_HDA_PREALLOC_SIZE= > 2048 > buffer_size 8192 > } > } > capture.pcm "schneeball" > } > > libvirt xml snippets: > > <sound model='ich9'> > <address type='pci' domain='0x0000' bus='0x00' slot='0x09' > function='0x0'/> > </sound> > ... > <qemu:env name='QEMU_AUDIO_DRV' value='alsa'/> > <qemu:env name='QEMU_DAC_FIXED_SETTINGS' value='0'/> > <qemu:env name='QEMU_DAC_TRY_POLL' value='0'/> > <qemu:env name='QEMU_DAC_TIMER_PERIOD' value='0'/> > <qemu:env name='QEMU_DAC_BUFFER_SIZE' value='0'/> > <qemu:env name='QEMU_DAC_PERIOD_SIZE' value='0'/> > <qemu:env name='QEMU_DAC_DEV' value='dmixed'/> > > _______________________________________________ > libvirt-users mailing list > libvirt-users(a)redhat.com > https://www.redhat.com/mailman/listinfo/libvirt-users

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[libvirt-users] how to create container image for an existing container
by WANG Cheng D 21 Dec '16

21 Dec '16

Dear all, I installed 8 containers using "yum --installroot=/root/fedora16lxc" to create the container filesystem. Now I want to manage these containers with openstack. So I need to deploy these containers by openstack which needs the container image. Can anyone tell me how to export my existing container's image? I am not sure if openstack can create container without an image file. And I don't want to use Docker. Thank you in advance. Cheng

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[libvirt-users] Audio in Windows 10 VM is distorted. Using ALSA.
by Manuel Ullmann 21 Dec '16

21 Dec '16

Hi, I can’t seem to find a solution for my last VM issue. I have distorted sound, when I play the Windows 10 device test sound. Only the Windows sound is affected. Mpd of the host is playing just fine meanwhile. I am using ich9 as emulated card, which is detected and installed correctly. The VM is using vfio-igd passthrough, so vnc or spice are not used. I tried to match the Windows driver configuration, which only supports 16 bit output. I have a 24 bit USB headphone amplifier, which does not support it (S32_LE only). Trying direct playback on the PCH card jack did not help though. The headphone amplifier is connected via optical Toslink, so there is standard snd_hda_intel output used (snd_usb_audio is not involved). Passing the USB part through I get much clearer output, but still have popping sounds. Googling around, they seem to be quite common on Windows 10, although I had it working fine on two bare-metal machines. I have tried fixed settings matching the ones of the dmixed device too. Don’t know, what is polled with enabled poll option. I also tried sdl and pulseaudio, which did not help. For the latter not so surprising since it is an Alsa pipe. The former was worse. The goal of this setup is having the same playlist state on both systems and using the better audio framework for music playback (Windows uses too much software layers). Of course the popping sounds on audio device passthrough also would be annoying, but that might be a different issue. Best regards, Manuel used alsa device: pcm.dmixed { type asym playback.pcm { # See plugin:dmix at http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html type dmix # Don't block other users, e.g. the Timidity midi-player daemon # http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html ipc_key_add_uid false ipc_key 1025 ipc_perm 0660 ipc_gid audio # Don't put the rate here! Otherwise it resets the rate & channels set below, as shown by: cat /proc/asound/card0/pcm0p/sub0/hw_params slave { # 2 for stereo, 6 for surround51, 8 for surround71 channels 2 pcm { format S16_LE #format S32_LE #rate 44100 rate 48000 # http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html # Maybe helps nonblock true type hw card "PCH" device 0 subdevice 0 } # mplayer2 chooses 1024 # period_size 512 with buffer_size 16384 stops crackling in xmame # 320 breaks flash - https://bbs.archlinux.org/viewtopic.php?id=129458 #period_size 512 period_size 1024 # 4096 might make sound crackle # mplayer2 chooses 8192. Half-Life 2 chooses 16384. # If too large, use CONFIG_SND_HDA_PREALLOC_SIZE=2048 buffer_size 8192 } } capture.pcm "schneeball" } libvirt xml snippets: <sound model='ich9'> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </sound> ... <qemu:env name='QEMU_AUDIO_DRV' value='alsa'/> <qemu:env name='QEMU_DAC_FIXED_SETTINGS' value='0'/> <qemu:env name='QEMU_DAC_TRY_POLL' value='0'/> <qemu:env name='QEMU_DAC_TIMER_PERIOD' value='0'/> <qemu:env name='QEMU_DAC_BUFFER_SIZE' value='0'/> <qemu:env name='QEMU_DAC_PERIOD_SIZE' value='0'/> <qemu:env name='QEMU_DAC_DEV' value='dmixed'/>

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[libvirt-users] virDomainBlockInfo for local volume
by Shahar Havivi 21 Dec '16

21 Dec '16

Hi, I am using virStorageVolGetInfo to get the volume size virStorageVol.download to download a normal file for VDSM project. I want to add support for block devices as well, I was able to see the size via virDomainBlockInfo and download via virDomain.blockPeek which is works fine for both file and block device. 1. Can I depend on virDomainBlockInfo for non block devices? 2. Does the virDomainBlockInfo return the correct physical size for normal file? 3. Performance wise do we have a difference between virStorageVol.download and virDomain.blockPeek? Assuming the VMs are down, this is the code I intend to use for all formats: vm = con.lookupByName(options.vmname) info = vm.blockInfo(src) physical = info[2] off = 0 size = 0 with open(dest, 'w+') as f: while off < physical: if (physical - off) < bufsize: size = physical - off else: size = bufsize buf = vm.blockPeek(src, off, size) f.write(buf) off += size

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[libvirt-users] Trying virgl in fedora 25
by Gianluca Cecchi 14 Dec '16

14 Dec '16

Hello, I'm trying to test what found here: http://blog.wikichoon.com/2016/05/spice-openglvirgl-acceleration-on.html and here: https://www.kraxel.org/blog/tag/virgl/ My system is a fedora 25 laptop, born in version 23 and gradually updated to 24 and 25 now. I had a fedora 25 guest that worked ok with "normal"spice and I'm trying to configure with virgl Main components currently installed on host: qemu-kvm-2.7.0-7.fc25.x86_64 libvirt-2.2.0-2.fc25.x86_64 virt-manager-1.4.0-4.fc25.noarch VirtualGL-2.4-7.fc25.x86_64 Commands executed to modify configuration: [root@ope46 qemu]# virt-xml f25 --confirm --edit --video clearxml=yes,model=virtio,accel3d=yes --- Original XML +++ Altered XML @@ -94,8 +94,9 @@ <address type="pci" domain="0x0000" bus="0x00" slot="0x04" function="0x0"/> </sound> <video> - <model type="virtio" heads="1" primary="yes"/> - <address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0"/> + <model type="virtio"> + <acceleration accel3d="yes"/> + </model> </video> <redirdev bus="usb" type="spicevmc"> <address type="usb" bus="0" port="1"/> Define 'f25' with the changed XML? (y/n): y Domain 'f25' defined successfully. [root@ope46 qemu]# virt-xml f25 --confirm --edit --graphics clearxml=yes,type=spice,gl=on,listen=none WARNING qemu/libvirt version may not support spice GL --- Original XML +++ Altered XML @@ -86,9 +86,9 @@ </channel> <input type="mouse" bus="ps2"/> <input type="keyboard" bus="ps2"/> - <graphics type="spice" autoport="yes"> - <listen type="address"/> - <image compression="off"/> + <graphics type="spice" autoport="no"> + <gl enable="yes"/> + <listen type="none"/> </graphics> <sound model="ich6"> <address type="pci" domain="0x0000" bus="0x00" slot="0x04" function="0x0"/> Define 'f25' with the changed XML? (y/n): y Domain 'f25' defined successfully. [root@ope46 qemu]# I don't know if the WARNING above is a generic one or if it makes any pre-check to system... Anyway both from vrt-manager and virsh I get error [root@ope46 qemu]# virsh start f25 error: Failed to start domain f25 error: internal error: process exited while connecting to monitor: 2016-12-13T11:18:37.784324Z qemu-system-x86_64: egl: no drm render node available 2016-12-13T11:18:37.784375Z qemu-system-x86_64: Failed to initialize EGL render node for SPICE GL [root@ope46 qemu]# and this in /var/log/libvirt/qemu/f25.log: 2016-12-13 11:18:37.584+0000: starting up libvirt version: 2.2.0, package: 2.fc25 (Fedora Project, 2 016-11-14-21:04:29, buildvm-25.phx2.fedoraproject.org) qemu version: 2.7.0(qemu-2.7.0-7.fc25), host name: ope46.ceda.polimi.it LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=spice /usr/bin/qemu-k vm -name guest=f25,debug-threads=on -S -object secret,id=masterKey0,format= raw,file=/var/lib/libvirt /qemu/domain-2-f25/master-key.aes -machine pc-i440fx-2.6,accel=kvm,usb=off,vmport=off -cpu Nehalem - m 4096 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid d4c23620-b805-4656-9b97-d9d4ab9d ba63 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/ var/lib/libvirt/qemu/domain-2- f25/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x6.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x6 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x6.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x6.0x2 -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x8 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive if=none,id=drive-ide0-0-0,readonly=on -device ide-cd,bus=ide.0,unit=0,drive= drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive file=/var/lib/libvirt/images/ f25.qcow2,format=qcow2,if=none,id=drive-scsi0-0-0-0 -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive- scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2 -netdev tap,fd=26,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:17:49:49,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=1,chardev= charchannel0,id=channel0,name=com.redhat.spice.0 -spice port=0,disable-ticketing,gl=on,seamless-migration=on -device virtio-vga,id=video0,virgl=on,bus=pci.0,addr=0x2 -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=1 -chardev spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 -msg timestamp=on char device redirected to /dev/pts/1 (label charserial0) 2016-12-13T11:18:37.784324Z qemu-system-x86_64: egl: no drm render node available 2016-12-13T11:18:37.784375Z qemu-system-x86_64: Failed to initialize EGL render node for SPICE GL 2016-12-13 11:18:37.891+0000: shutting down What can I check? Any pre-requisite in laptop video adapter or other? Thanks in advance, Gialuca

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Re: [libvirt-users] virsh not detecting hugepage mount; disabled by config?
by Manuel Ullmann 14 Dec '16

14 Dec '16

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Thanks a lot you two, yes hugetlbfs is not mounted, when libvirtd is started… It was a long night. Did put it to fstab and since I do not allocate them on regular boots, it won’t eat my ram (that was the main consideration for doing it like this). As a last means before going to sleep, I added <qemu:arg value='-numa'/> <qemu:arg value='node,memdev=mem42'/> <qemu:arg value='-object'/> <qemu:arg value='memory-backend-file,size=6G,mem-path=/var/lib/hugetlbfs,share=on,id=mem42'/> to the xml which worked too (surprise), but I have it working now in the intended way. Then I never got to the last part of the qemu.conf option comment so I had to do another 3 reboots. Well, reading helps. So the fstab entry reads now: hugetlbfs /var/lib/hugetlbfs/libvirt/qemu hugetlbfs relatime,rw,pagesize=1073741824 0 0 with /var/lib/hugetlbfs being the mount point in qemu.conf. At least I didn’t forget to create the mount point before rebooting. Best regards, Manuel > Hi, > > I use gentoo with desktop+systemd profile to run Windows 10 VM with pci > passthrough and hugetlbs. > > Things I had to do for hugetlbs: > 1) Made sure their support was enabled in kernel > 2) Passed parameters for their allocation to kernel. There are other > ways, but I use 1GB page size and I have to allocate them before memory > gets fragmented. Note, you do that with hugepages=3072. > 3) Passed hugetlbs settings to libvirt VM domain (XML). > > That is it. I don't mount them myself. I think (can't check now) they > are automounted to /dev/hugetlbs. By default, libvirtd runs as root, and > qemu as user qemu. Consuming hugetlb and releasing them should be > transparent. > > I suggest starting without softlevel=qemuvm into default runlevel, and > then check /proc/meminfo. Hugetlbs total and free should be > 0. Do the > same with qemuvm runlevel. Maybe this runlevel misses something. > > On 2016-12-14 00:05, Manuel Ullmann wrote: >> Hi, >> >> I’m struggling with virsh not detecting my hugepage mount. >> >> I have the following kernel command line: >> BOOT_IMAGE=/vmlinuz-4.8.13-gentoo root=/dev/mapper/gensd-gentoo ro quiet >> splash intel_iommu=on video=efifb:off,vesafb:off,simplefb:off >> splash=verbose,theme:livedvd-aurora kvm.ignore_msrs=1 >> transparent_hugepage=never hugepages=3072 softlevel=qemuvm >> >> My startup script outputs the following: >> hugetlbfs /var/lib/hugetlbfs hugetlbfs >> rw,relatime,pagesize=2097152,uid=77,gid=77,mode=0770 0 0 >> [2016.12.13 22:22:50 virsh 2808] ERROR Failed to start domain win10 >> [2016.12.13 22:22:50 virsh 2808] ERROR internal error: hugetlbfs >> filesystem is not mounted or disabled by administrator config >> virsh was unsuccessful >> >> So hugetlbfs is definitively mounted, but virsh does either not detect >> it or some magical option, that I’ve not found in a day searching for >> it, disables it (the documentation could explain that better). Since the >> Ubuntu guys refer to the KVM_HUGEPAGES environment, I tried adding it to >> start-stop-daemon environment, but it seems non-relevant. 77 is the qemu >> user id, but I’m quite sure the permission issues were excluded (tried >> root permissions as well). Besides I had permission errors occasionally >> occasionally and don’t have them anymore. If you could provide a hint to >> the magical administrator configuration option, that would be helpful. >> Tried hugeadm as well, pointing the config to the correct destination. >> >> Thanks in advance, >> Manuel >> >> PS: >> The virsh script reads like this: >> #!/bin/sh >> cmdline="$(cat /proc/cmdline)" >> if [[ "${cmdline##* }" == "softlevel=qemuvm" ]]; then >> mount -o rw,relatime,pagesize=2097152,uid=77,gid=77,mode=0770 -t >> hugetlbfs hugetlbfs /var/lib/hugetlbfs >> sysctl kernel.shmmax=6442450944 >> cat /proc/mounts | grep hugetlb >> /var/log/virsh.log >> sed -i -e '/^hugetlb/{s/^/\#/}' /etc/libvirt/qemu.conf >> counter=0 >> while [ "${counter}" -lt 10 && ! -S /var/run/libvirt/libvirt-sock ]; do >> sleep 1 >> counter=$(( ++counter )) >> done >> if [ $counter -gt 9 ]; then >> echo "libvirtd socket generation timed out" >> /var/log/virsh.log >> fi >> if pidof libvirtd &>/dev/null; then >> LC_ALL=C /usr/bin/virsh -l /var/log/virsh.log start win10 >> if [ $? -gt 0 ]; then >> echo "virsh was unsuccessful" >> /var/log/virsh.log >> reboot >> fi >> else >> echo "libvirtd is not started" >> /var/log/virsh.log >> reboot >> fi >> fi >> >> reboot is more convenient, since this is a vfio-igd passthrough vm. >> >> >> _______________________________________________ >> libvirt-users mailing list >> libvirt-users(a)redhat.com >> https://www.redhat.com/mailman/listinfo/libvirt-users >> -----BEGIN PGP SIGNATURE----- iQQcBAEBCAAGBQJYUVAKAAoJELgK9xQKkpX6sTof/2fdLX9qjiNgecKEIzHKEjBY ln6o7E0nMY796Jf3HQ/v620uVZS3Nf4dRSFC9NVetzAgVcQizwko0ikVDsaCZlNP 5HojcRm2SK8c5CgU/ZLdLPp73PgrORtKYytYldhPQFebgOpNCJGzWAPXGnoLK78s aHsKGKb5R79+K2Bq5DAQGR5N9wiV84Oi+afNjBunjj1dT+80YPAAtXuRKkDdD3lQ hVBEdzgRLWW48FdEhIp2TlTJCyx4OwMGnIXaOPXrQSyMW6Omn49ZXYqwIgsOW45S bzFZ4BPuqhrANne4YDPjuxwtL65YUKAyHZWl/bTBmqkFrpjecxYDnlg219t2KsiM k3W9GQ0CWR74f0lJLULaV+ome13ydga5pDRe6+dyi7g0O7/4DTPuxQTRo07UiA/i dQmvtzTAbGdSpGqyFBQqIFGMG4sB8kypXp1PIK06jX1Muon6WCdzAzt1IztLeuSW qUj/srdnD9rLWWPlIV2NCZ3E5Da4szRD8gbhNIG2hg+Ss50pLdIFwlUbfksryY7B B6L6KmpOw4LrpCZVFBeFhG5lFns9YSvYNKvSBRwJaxl838j8Kr8B1bo51nMYERL1 wJXK9IyFqx8jkbmFvfwXij5lx3DFBrLEQwymGmaLmJ4FQmnA9491L2F3K+NyG8kX Yi/w+Xh9ZARoRy8/2SmVYwvB1vZkFpf04adocHxIYMT1P3ZLpCktu3P/DMdkdR26 DcnQedl7qbf7NeldxMiY0zTAti85VFuQggFQlRrB36pRdOXvFMk3mNLBiifICNvP 32sTl/9HnmscWCTSebmK/KjQjrLf9ijbc3V942WziwkEyDbOhfTUn0JfcZJl0FdM OQ0j00t5wv14KFPP/hpWqRiypwXpboHLpB4k718NZElObUOob0ziz6PJc5iCzJDW AkNbO1sEDgWN/pPorAYKPtre3TV6qk/k6A13zgNmMdZA4ZHRq6dsZLzCLnEaLwJE G5WFveDyi4COVpelysArTPrw6aL4LAzIhkRN5A5YCANgsPtnhjql6XmL3sTSN93Z R42klgPKNZVq5Bkdp2EpE70X+F/4j2jhRNznVp3YDU+6q6aNWHdqw7jCAhEji0aA 49gR3tIUgXp1883zc0vSFIMnCwYQQoCjqGpVZXWLtbxAmJrz5c4XeUCnpplfJW3Z jRS19MEy6HgKmdkq1a4bRG5XFc87Ga2JWqwSXpGb1EsMvyMU3CQq47D98WqaeC9p JTOuLMpYvlH+EEbEkL/deysLGVZ7QDTr5P4L+wOzN9jhSOrnIoNlVU5DVP7dhT2L z1d3UY3cFhoVFLKyfbLF+flK7Y5aygQ/eO/+MlXmd9TI+2qTVehNSXiYTEnnsO0= =1DU1 -----END PGP SIGNATURE-----

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[libvirt-users] virsh not detecting hugepage mount; disabled by config?
by Manuel Ullmann 14 Dec '16

14 Dec '16

Hi, I’m struggling with virsh not detecting my hugepage mount. I have the following kernel command line: BOOT_IMAGE=/vmlinuz-4.8.13-gentoo root=/dev/mapper/gensd-gentoo ro quiet splash intel_iommu=on video=efifb:off,vesafb:off,simplefb:off splash=verbose,theme:livedvd-aurora kvm.ignore_msrs=1 transparent_hugepage=never hugepages=3072 softlevel=qemuvm My startup script outputs the following: hugetlbfs /var/lib/hugetlbfs hugetlbfs rw,relatime,pagesize=2097152,uid=77,gid=77,mode=0770 0 0 [2016.12.13 22:22:50 virsh 2808] ERROR Failed to start domain win10 [2016.12.13 22:22:50 virsh 2808] ERROR internal error: hugetlbfs filesystem is not mounted or disabled by administrator config virsh was unsuccessful So hugetlbfs is definitively mounted, but virsh does either not detect it or some magical option, that I’ve not found in a day searching for it, disables it (the documentation could explain that better). Since the Ubuntu guys refer to the KVM_HUGEPAGES environment, I tried adding it to start-stop-daemon environment, but it seems non-relevant. 77 is the qemu user id, but I’m quite sure the permission issues were excluded (tried root permissions as well). Besides I had permission errors occasionally occasionally and don’t have them anymore. If you could provide a hint to the magical administrator configuration option, that would be helpful. Tried hugeadm as well, pointing the config to the correct destination. Thanks in advance, Manuel PS: The virsh script reads like this: #!/bin/sh cmdline="$(cat /proc/cmdline)" if [[ "${cmdline##* }" == "softlevel=qemuvm" ]]; then mount -o rw,relatime,pagesize=2097152,uid=77,gid=77,mode=0770 -t hugetlbfs hugetlbfs /var/lib/hugetlbfs sysctl kernel.shmmax=6442450944 cat /proc/mounts | grep hugetlb >> /var/log/virsh.log sed -i -e '/^hugetlb/{s/^/\#/}' /etc/libvirt/qemu.conf counter=0 while [ "${counter}" -lt 10 && ! -S /var/run/libvirt/libvirt-sock ]; do sleep 1 counter=$(( ++counter )) done if [ $counter -gt 9 ]; then echo "libvirtd socket generation timed out" >> /var/log/virsh.log fi if pidof libvirtd &>/dev/null; then LC_ALL=C /usr/bin/virsh -l /var/log/virsh.log start win10 if [ $? -gt 0 ]; then echo "virsh was unsuccessful" >> /var/log/virsh.log reboot fi else echo "libvirtd is not started" >> /var/log/virsh.log reboot fi fi reboot is more convenient, since this is a vfio-igd passthrough vm.

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[libvirt-users] Kernel panic after kernel update
by Michael Ströder 07 Dec '16

07 Dec '16

HI! On one qemu-kvm instance a kernel update failed and booting the image is not possible anymore (see below). A dozen other VMs are correctly working after the upgrade. Anything I can quickly try to make it work again? (This is not really a bad emergency case because I could simply re-install and re-configure with ansible. But I'd like to learn about these cases...) Ciao, Michael. Loading Linux 4.8.12-1-default ... [ 0.651328] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) [ 0.654408] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.12-1-default #1 [ 0.656941] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014 [ 0.661166] 0000000000000000 ffffffff813a4252 ffff9a5348c4d000 ffff9a5349957e60 [ 0.664652] ffffffff8118e3fa ffff9a5300000010 ffff9a5349957e70 ffff9a5349957e08 [ 0.668124] ffffffff8118e715 ffff9a5349957e78 0000000000000001 0000000000000000 [ 0.671457] Call Trace: [ 0.672460] [<ffffffff8102eefe>] dump_trace+0x5e/0x310 [ 0.674389] [<ffffffff8102f2cb>] show_stack_log_lvl+0x11b/0x1a0 [ 0.676570] [<ffffffff81030001>] show_stack+0x21/0x40 [ 0.678480] [<ffffffff813a4252>] dump_stack+0x5c/0x7a [ 0.680369] [<ffffffff8118e3fa>] panic+0xd5/0x217 [ 0.682169] [<ffffffff81f56419>] mount_block_root+0x1fe/0x2c0 [ 0.684285] [<ffffffff81f56668>] prepare_namespace+0x12b/0x161 [ 0.686439] [<ffffffff81f56103>] kernel_init_freeable+0x1f6/0x20a [ 0.688675] [<ffffffff816c727a>] kernel_init+0xa/0x100 [ 0.690623] [<ffffffff816d485f>] ret_from_fork+0x1f/0x40 [ 0.696659] DWARF2 unwinder stuck at ret_from_fork+0x1f/0x40 [ 0.698858] [ 0.699533] Leftover inexact backtrace: [ 0.699533] [ 0.701580] [<ffffffff816c7270>] ? rest_init+0x90/0x90 [ 0.703944] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

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[libvirt-users] How to best I/O performance for Window2008 and MSSQL guest VM
by Roberto Fichera 07 Dec '16

07 Dec '16

Hi There, I've moved some Windows2012 with MSSQL VMs from an hold ESXi 5.5 machine to a more recent and powerful machine running Fedora 24 x86_64 and related libvirt + KVM virtualization. I've moved the VMs filesystem to LVM slices and installed the VirtIO drivers in to all Windows VMs. I've also set both Disk and Network interface to work using VirtIO. So far so good everything works pretty fine. Now I would like to tune at best the MSSQL VM for both Disk and Network interfaces in order to get the best performance possible. Regarding network interface I've set it to work as bridge instead to go through to macvtap, so I'm not sure what is the best in this case. Regarding disk, since it's LVM I've chosen to go to cache mode none and IO mode native. Also here cannot judge what's the best setup for the workload. I'm undecided to use IO mode threads along directsync cache mode. Finally I've set "ionice -c 1 -p <qemu-pid> -n 0" and "renice -n -10 <qemu-pid>" for the interested VM that I want to get best performance possible. Even with the above setup, the MSSQL VM has performance similar to the old machine running ESXi 5.5, so does anyone can suggest where too look at and/or what would be the right setup? Thanks in advance. Roberto Fichera

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[libvirt-users] How can openstack retrieve the CPU usage of a lxc via libvirt?
by WANG Cheng D 06 Dec '16

06 Dec '16

Dear all, I want to have a view of lxc CPU usage in openstack Dashboard. According the Openstack official site , Openstack Ceilometer can poll libvirt daemon to obtain CPU usage of a virtual machine. I tried the command locally on the libvirtd host "virsh -c lxc:/// domjobinfo", I got an error "error: this function is not supported by the connection driver: virDomainGetJobInfo" I am not sure if Openstack Ceilometer can retrieve the CPU usage of a linux container, if it can, which virsh command or API should be used to this? Thank you for your response in advance. Cheng

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