February 2020 - Users - libvirt List Archives

[libvirt-users] [virtual interface] detach interface during boot succeed with no changes
by Yalan Zhang 08 Sep '22

08 Sep '22

Hi guys, when I detach an interface from vm during boot (vm boot not finished), it always fail. I'm not sure if there is an existing bug. I have confirmed with someone that for disk, there is similar behavior, if this is also acceptable? # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 2; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </controller> <interface type='network'> <mac address='52:54:00:98:c4:a0'/> <source network='default' bridge='virbr0'/> <target dev='vnet0'/> <model type='rtl8139'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> When I detach after the vm boot, expand the sleep time to 10, it will succeed. # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 10; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully ------- Best Regards, Yalan Zhang IRC: yalzhang Internal phone: 8389413

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[libvirt-users] Live migrate + change interface name
by Marc Roos 08 Oct '20

08 Oct '20

Is it possible to do a live migrate of a guest, having on the from host a source_device=eth2 and to host a source_dev=eth1?

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[libvirt-users] Add Virtlyst to the list of libvirt users
by Daniel Nicoletti 24 Sep '20

24 Sep '20

Hi, I've just released v1.0.0 of Virtlyst[1] a web tool to manage VMs using Qt/C++/Cutelyst https://dantti.wordpress.com/2018/04/19/announcing-virtlyst-a-web-interface… Thanks. 1 - https://github.com/cutelyst/Virtlyst -- Daniel Nicoletti KDE Developer - http://dantti.wordpress.com

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guest-fsfreeze-freeze freezes all mounted block devices
by Marc Roos 10 Aug '20

10 Aug '20

I wondered if anyone here can confirm that virsh qemu-agent-command domain '{"execute":"guest-fsfreeze-freeze"}' Freezes all mounted block devices filesystems. So if I use 4 block devices they are all frozen for snapshotting. Or just the root fs?

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[libvirt-users] Question about disabling UFO on guest
by Bao Nguyen 05 Aug '20

05 Aug '20

Hello everyone, I would like to ask a question regarding to disable UFO of virtio vNIC in my guest. I have read the document at https://libvirt.org/formatdomain.html *host* The csum, gso, tso4, tso6, ecn and ufo attributes with possible values on and off can be used to turn off host offloading options. By default, the supported offloads are enabled by QEMU. *Since 1.2.9 (QEMU only)* The mrg_rxbuf attribute can be used to control mergeable rx buffers on the host side. Possible values are on (default) and off. *Since 1.2.13 (QEMU only)* *guest* The csum, tso4, tso6, ecn and ufo attributes with possible values on and off can be used to turn off guest offloading options. By default, the supported offloads are enabl ed by QEMU. *Since 1.2.9 (QEMU only)* Then I disabled UFO on my vNIC on guest as the following configuration <devices> <interface type='network'> <source network='default'/> <target dev='vnet1'/> <model type='virtio'/> <driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off' queues='5' rx_queue_size='256' tx_queue_size='256'> *<host gso='off' ufo='off' />* *<guest ufo='off'/>* </driver> </interface> </devices> Then I reboot my node to get the change effect and it works. However, can I disable the UFO without touching the host OS? or it always has to disable on both host and guest like that? Thanks, Brs, Natsu

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qemu hook: event for source host too
by Guy Godfroy 23 Jun '20

23 Jun '20

Hello, this is my first time posting on this mailing list. I wanted to suggest a addition to the qemu hook. I will explain it through my own use case. I use a shared LVM storage as a volume pool between my nodes. I use lvmlockd in sanlock mode to protect both LVM metadata corruption and concurrent volume mounting. When I run a VM on a node, I activate the desired LV with exclusive lock (lvchange -aey). When I stop the VM, I deactivate the LV, effectively releasing the exclusive lock (lvchange -an). When I migrate a VM (both live and offline), the LV has to be activated on both source and target nodes, so I have to use a shared lock (lvchange -asy). That's why I need a hook event on the source host too (as far as I know after my tests, the migration event is only triggered on the target host). Is such a feature a possibility? Thanks for your attention. Guy Godfroy

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Re: USB-hotplugging fails with "failed to load cgroup BPF prog: Operation not permitted" on cgroups v2
by Pavel Hrdina 13 May '20

13 May '20

On Mon, Jan 20, 2020 at 09:00:15PM +0100, Pol Van Aubel wrote: > Hi, > > Quoting Pavel Hrdina (2020-01-20 14:29:36) > > On Sat, Jan 18, 2020 at 11:17:11PM +0100, Pol Van Aubel wrote: > > > Hi all, > > > > > > I've disabled cgroups v1 on my system with the kernel boot option > > > "systemd.unified_cgroup_hierarchy=1". Since doing so, USB hotplugging > > > fails to work, seemingly due to a permissions problem with BPF. Please > > > note that the technique I'm going to describe worked just fine for > > > hotplugging USB devices to running domains until this change. > > > Attaching / detaching USB devices when the domain is down still works as > > > expected. > > > > > > I get the same error when attaching a device in virt-manager, as I do > > > when running the following command: > > > > > > sudo virsh attach-device wenger /dev/stdin --persistent <<END > > > <hostdev mode='subsystem' type='usb' managed='yes'> > > > <source startupPolicy='optional'> > > > <vendor id='0x046d' /> > > > <product id='0xc215' /> > > > </source> > > > </hostdev> > > > END > > > > > > This returns > > > error: Failed to attach device from /dev/stdin > > > error: failed to load cgroup BPF prog: Operation not permitted > > > > > > > > > virt-manager returns basically the same error, but for completeness' > > > sake, here it is: > > > > > > failed to load cgroup BPF prog: Operation not permitted > > > > > > Traceback (most recent call last): > > > File "/usr/share/virt-manager/virtManager/addhardware.py", line 1327, in _add_device > > > self.vm.attach_device(dev) > > > File "/usr/share/virt-manager/virtManager/object/domain.py", line 920, in attach_device > > > self._backend.attachDevice(devxml) > > > File "/usr/lib/python3.8/site-packages/libvirt.py", line 590, in attachDevice > > > if ret == -1: raise libvirtError ('virDomainAttachDevice() failed', dom=self) > > > libvirt.libvirtError: failed to load cgroup BPF prog: Operation not permitted > > > > > > > > > Now, libvirtd is running as root, so I don't understand why any > > > operation on BPF programs is not permitted. I've dug into libvirt's code > > > a bit to see what is throwing this error and it boils down to > > > <https://github.com/libvirt/libvirt/blob/7d608469621a3fda72dff2a89308e68cc9f…> > > > and > > > <https://github.com/libvirt/libvirt/blob/02bf7cc68bfc76242f02d23e73cad36618f…> > > > but I have no clue what that syscall is doing, so that's where my > > > debugging capability basically ends. > > > > > > Maybe this is something as simple as setting the right ACL somewhere. I > > > haven't touched /etc/libvirt/qemu.conf except for setting nvram. There > > > *is* something about cgroup_device_acl there but afaict that's for > > > cgroups v1, when there was still a device cgroup controller. Any help > > > would be greatly appreciated. > > > > > > > > > Domain log files: > > > Upon execution of the above commands, nothing gets added to the domain > > > log in /var/log/qemu/wenger.log, so I've decided they're likely > > > irrelevant to the issue. Please ask for any additional info required. > > > > > > > > > System information: > > > Arch Linux, (normal) kernel 5.4.11 > > > libvirt 5.10.0 > > > qemu 4.2.0, using KVM. > > > Host system is x86_64 on an intel 5820k. > > > Guest system is probably irrelevant, but is Windows 10 on the same. > > > > > > > > > Possibly relevant kernel build options: > > > $ zgrep BPF /proc/config.gz > > > [22:55:52]: zgrep BPF /proc/config.gz > > > > > > CONFIG_CGROUP_BPF=y > > > CONFIG_BPF=y > > > CONFIG_BPF_SYSCALL=y > > > CONFIG_BPF_JIT_ALWAYS_ON=y > > > CONFIG_IPV6_SEG6_BPF=y > > > CONFIG_NETFILTER_XT_MATCH_BPF=m > > > # CONFIG_BPFILTER is not set > > > CONFIG_NET_CLS_BPF=m > > > CONFIG_NET_ACT_BPF=m > > > CONFIG_BPF_JIT=y > > > CONFIG_BPF_STREAM_PARSER=y > > > CONFIG_LWTUNNEL_BPF=y > > > CONFIG_HAVE_EBPF_JIT=y > > > CONFIG_BPF_EVENTS=y > > > # CONFIG_BPF_KPROBE_OVERRIDE is not set > > > # CONFIG_TEST_BPF is not set > > > > Hi > > > > I've installed clean archlinux to try this out and it works as expected, > > I'm able to attach USB device into a VM. > > > > My system env is mostly the same as yours except for kernel version: > > > > kernel 5.4.13 > > libvirt 5.10.0 > > qemu 4.2.0, using KVM. > > > > Please enable libvirt debug logs [1] and share the output with us. > > I've updated to 5.4.13 and created a barebones VM without storage to > reproduce the behaviour. libvirtd debug logs are attached. There appear > to be two BPF failures of the same BPF program (?). The first is on line > 23209, which appears to be part of machine startup, and which I don't > actually notice. The second one is where I manually add the USB device, > on line 30599. > > Thanks, Thanks for the logs, but it did not help to figure out where the issue is. I was hoping to see some error output from the syscall but the line that should contain it is empty: 2020-01-20 19:47:15.589+0000: 8579: debug : virBPFLoadProg:78 : Can you please check system logs and output of dmesg? I've managed to run into this article [1] that explains that even if you have all permissions and no SELinux you can still be blocked by something called kernel_lockdown and it should appear in dmesg. Pavel [1] <https://gehrcke.de/2019/09/running-an-ebpf-program-may-require-lifting-the-…>

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kvm presenting wrong CPU Topology for cache
by Satish Patel 02 Mar '20

02 Mar '20

Folks, I am having major performance issue with my Erlang application running on openstack KVM hypervisor and after so many test i found something wrong with my KVM guest CPU Topology This is KVM host - http://paste.openstack.org/show/790120/ This is KVM guest - http://paste.openstack.org/show/790121/ If you carefully observe output of both host and guest you can see guest machine threads has own cache that is very strange L2 L#0 (4096KB) + Core L#0 L1d L#0 (32KB) + L1i L#0 (32KB) + PU L#0 (P#0) L1d L#1 (32KB) + L1i L#1 (32KB) + PU L#1 (P#1) I believe because of that my erlang doesn't understand topology and going crazy.. I have Ali Cloud and AWS and when i compare with them they are showing correct CPU Topology the way physical machine showing, something is wrong with my KVM look like. I am running qemu-kvm-2.12 on centos 7.6 and i have tune my KVM at my best level, like CPU vining, NUMA and cpu host-passthrough. Thanks in advance for your help.

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libvirtError: Timed out during operation: cannot acquire state change lock (held by monitor=remoteDispatchDomainMigratePerform3Params)
by Blake Anderson 29 Feb '20

29 Feb '20

Hi everyone, I have a question that you may be able to help me with. I had a live block migration of a qemu-kvm guest fail (initiated via nova), in which the guest remained running on the source, but if I try to re-initiate the live migration it returns libvirtError: Timed out during operation: cannot acquire state change lock (held by monitor=remoteDispatchDomainMigratePerform3Params). Looking at blockjob --info I see there is a block copy that has been stuck at 23 % for a few hours now. Is it safe to issue a —abort to the blockjob without impacting the vm and will that resolve the lock? Source: libvirt-4.5.0-23.el7_7.5.x86_64 qemu-kvm-ev-2.10.0-21.el7_5.7.1.x86_64 Destination: libvirt-4.5.0-23.el7_7.5.x86_64 qemu-kvm-ev-2.10.0-21.el7_5.7.1.x86_64 Thanks, Blake

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Windows guest stalls during reboot
by Benjammin2068 28 Feb '20

28 Feb '20

Hey all, Quick question. I have a (RHEL/CentOS v7) Windows 10 Pro (64bit) guest that shutdown just fine (i.e. KVM shows the host as shut down), but when Windows is set to reboot, KVM Manager shows the guest screen as shut down, but KVM Manager shows the guest as still running and the system never reboots. If I do 'virsh list' -- there's no guest running. If I do 'virch start MyWin10Guest' -- that starts the guest back up and things are like they were before. Am I missing a new setting someplace? I can't seem to type in the right thing in Google to help me figure this one out. Thanks a bunch, -Ben

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pci device vga added not showing
by Barry Cisna 24 Feb '20

24 Feb '20

Hello All, Trying to get virgl working from linux host to windows guest in virt-manager i have added the host graphics card Matrox G200ew to the hardware settings as a pci device for Windows 10 guest. When i go to spice server settings, and select Opengl checked there are no available pci devices listed in the drop down box select. Am trying to get some 3d working on Windows guest and seems from reading this is almost impossible short of doing gpu passthrough with a second GPU in the host. Am probably missing something. Thank You.

1 0

build problem with libxl
by Christoph 21 Feb '20

21 Feb '20

Hi all since 5.9.0 configure doesnt find the libxl libs/headers... It works With 5.8.0, with 5.9.0 not... not even if I set --with-libxl What can be the problem? -- ------ Greetz

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Cannot turn iommu on inside guest
by Mauricio Tavares 20 Feb '20

20 Feb '20

So I want to turn iommu support on in a guest ( <type arch='x86_64' machine='pc-q35-4.1'>hvm</type>). Per [1] I tried to add to devices either <devices> <iommu model='intel'> <driver intremap='on'/> </iommu> </devices> or just a simpler <devices> <iommu model='intel /'> </devices> However, when I try to boot it, it crashes with the following error message (stolen from /var/log/libvirt/qemu/testkvm.log): 2020-02-11T05:13:27.278707Z qemu-system-x86_64: We need to set caching-mode=on for intel-iommu to enable device assignment with IOMMU protection. 2020-02-11 05:13:27.577+0000: shutting down, reason=crashed that sounds like it wants me to do something like qemu-system-x86_64 [...] -device intel-iommu,intremap=on,caching-mode=on[2] using virsh. But <devices> <iommu model='intel'> <driver intremap='on' caching-mode='on '/> </iommu> </devices> is not only not mentioned in [1] but also fails [root@testbox tests]# virsh edit testkvm error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng Extra element devices in interleave Element domain failed to validate content Failed. Try again? [y,n,i,f,?]: Can anyone show me what I am missing here? [1] https://libvirt.org/formatdomain.html#elementsIommu [2] https://wiki.qemu.org/Features/VT-d#Command_Line_Example_2

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clustered lvm volume activation
by Timm Wunderlich 19 Feb '20

19 Feb '20

dear all, i have a problem with clustered lvm storage and the "logical" storage driver, perhaps someone has a suggestion. i have a clustered lvm (lvmlockd, not clvm) with 4 hosts running. when i start the storage on a host it activates all volumes in the whole volume group. then i cannot start the storage on other hosts because all volumes are already activated on one host. if i then deactivate all volumes in the started pool i can start the pool on other hosts. but then i have to manually activate the volume if i want to start the domain. it would be great if the logical pool driver would only activate the volume of a domain at domain start and not on pool start. does anybody have a workaround for this or any suggestions for me? do you think i should open an issue on it? Regards, Timm -- __________________________________________ Timm Wunderlich Systemadministrator Universität Siegen, Fakultät III Lehrstuhl für Wirtschaftsinformatik und Neue Medien Kohlbett Str. 15, 57068 Siegen Tel: +49 271-740 3382 timm.wunderlich(a)uni-siegen.de www.wineme.uni-siegen.de -----BEGIN PGP PUBLIC KEY BLOCK----- mQINBFtFv/cBEAC8s0N+dShoUlPAjN089DyWGuWuZHGJcHyU81GmSI5lYLdOqvfN NAZzZcUckuxlzqvT/Z18IbXMlzxkzxgM9Cf+x3TYdkEFW2Nm8NqdPAdW5Y9is8xg 3FcWjvSSj52VwkM8WvpR40X4c5amXxfIU0YfkGW49xMHNrvd+4keniNrsOhYR2Ej EHTEGfHz7jT0YiO2kytfpQqTFKGgeAsFzlfXJuqB4b6FVBrQ+EJnvsDfhpwVDpli XY4Kn9PeDNXNW85f2z9EplvYyOh0LVBFIXKle/k2v+2YLkthj0xAwYdxswytwzM8 YnRnNWAN0s+e1XKqyBR7ND8HN5pnETWAYfPNrB2PWJk8RcwK8Sh/CBlp43w0AZ0F WBh0YtrVDsi4EYrebkvYL3VJqsi2g9KF4QkBSghAUbJdkMGDvrMVPyPMAs9ISDTN rQaxJp95Bx+3kdj3XeKbkNsiy+bU1mbZDdbpTPH0ElGUV7Jcvfgf3WASg/cOzFpT OvWrX393gcE/eyTj8t11yPAbrf6vQBROkHODE9igxkJgBcHF7hjzqYFIARXcAZ5r iZwvhLItT9Oxh7B8neXOomcVc+YVI84qRM732KW8xI41mt26KkpBqPf0SYHXTP9/ cwwBhL3M5Ilp86uOPFcE7MBV3cEvU+KQCKofnnYaglrvokEmp7JOS7xLeQARAQAB tC9UaW1tIFd1bmRlcmxpY2ggPHRpbW0ud3VuZGVybGljaEB1bmktc2llZ2VuLmRl PokCVAQTAQgAPhYhBD/b8miy3HmpxCESukgeFEZUtL7iBQJbRb/3AhsjBQkJZgGA BQsJCAcCBhUICQoLAgQWAgMBAh4BAheAAAoJEEgeFEZUtL7i1rsQAJSr7kiVO4nq nX1YudhRuXI4iOLjoQgt4bfrBqr9Xaj4RXtWJUqqw8/KytRu/C4Lhijll12V0gMa nia5B8z6uRarloTZuiO8pEX9QpbGqzhS3txWHymXVjINKWeZg3+tQHjuJOLD/Hv2 pV5xsWltB+vuy4HyrNgus/seU3wi5DkwQGHc1ncNwX1Px+wY60DnizCyp6if1HwX 9yq91tXUszPPKHIDMUZWljfDxkrVyn5XbJubNPNeFXfSV1THJixp0jaeasdEdVkE FQX4A42Tch8LIHY0Rs7JoczEkytVLArvDiQrPbb1n+YFcNpGqdREq1VQSgVkU6NH YL2uPYNNxaB6LwNQpg7Sg5k4+Kxb9LW0YAObtazXVAN0xHb2mcSq5JE1XZP2LcpE +CEr0TBKgkYUEskWOa23tP/TaZlqv6ZS/XOHiTphynirrtxwUz7cYr8LCcIItz1t 3PPWU6NJ68T6nc6FzQifaIyR5GQWWI8qlUvL7FG5HghJp2cx4yC3IKaIoXbyd6/W gJGW5R3pmoPnvTCMLyJ62wLiiJ+AQ02uAhi4qr3IVFMkN9Og/GdgdcnW3M44Nvk2 u2ZvMFw7XvawKpVPqOsvP6UH7StZXJe+hTwcDFyR4YkvMX8UZ45AYU2X8o/BSqLG VwkkxqVA41ihBbJL7qKhz3Z7kj4vPWDxtDNUaW1tIFd1bmRlcmxpY2ggPHRpbW0u d3VuZGVybGljaEB0aW1td3VuZGVybGljaC5kZT6JAlQEEwEIAD4WIQQ/2/Jostx5 qcQhErpIHhRGVLS+4gUCW0XGmAIbIwUJCWYBgAULCQgHAgYVCAkKCwIEFgIDAQIe AQIXgAAKCRBIHhRGVLS+4oqTD/9oA//Dq1W5ikvD6b23Dnydg+oEOgucSejN35rG yPavozkOMda1bRMv0b515hNgpRG/PjBNpjaHyhqbuqZ45kfDEihJjKT6OrQriQSd mOO0hE5koYCvl5kOzyLzfbXsoHZjD+1x9x+BYWq5SktjpMtzhXPvFgScv0Bn85E2 QKd2XtBKWGEEEWsnfPxj8w63vL5A7njnGwq0pA7EPwHsofspRrJboN9M/zNUeft6 iM2VJPecT8AHdE2I/yGwNvn2zk373DVAIMp3yFkSSSNx1F04iNUgErzka7X40mSw ykd5MENn/7vsRRwt9ZKrRN/oXYSXoLv3nTC2TAvHIi1RdpB+X6xVlDAiXgl2WzuG vyByLc+C2W5lpRRq4HtcBSpkv0SDw97yVz1q/OKX+uPxHKz0/LfF57MfWJ19GQvI 5TiCtYSdZnoo/Mp2VG56uEtFo2vY9YuOQ1w5EhZ9nzficEX/BSS9rXqzTGbQOw/r jpuRtd+U8pVxAK9hNJU2MNuWVQ5wFg5VGzZn/WyE6t7zBaF2fnRvXEHFIlj0h/qj 4x/zCBNZTCr8sRJjIQVQAaA6/zdTdJPPH9HgDt3xUZp2bcMUssK1whZKPqYnOUPN R8D6qGjazeQFCNYH8Tcn1DNHl2rQXh14VLfw2XCVLC7rK8B7C7FXAVHBm4T5TY8R og9WfbkCDQRbRb/3ARAAqQycuV94W0Z51OFxn30WZdk+D6mAFeO2bHghNiRW0ecT +xmZjpH18qqGtNQOrSefsuJnoauqIu1oLq/Ap6HOld7KXAWCCTWiupJUT7J8JyC4 sUyuYPs4yzdNAuSskY62FwOK9hQwgAqYdlWC9Bzrqvb+dZucBTh2RBSbSPK9v+Qo 9YjPfLkTfZvCAGyweJ6mLqtxyqDcC9k9UFrH9GlJBaM9SXNr1PGY8M4FIkn4ionf CHQCD6nhJ3F6zyGMeWgw8SEERIeMo4dbFJbvonm4Y9yvXgtMxavoZZCibMEK/9xk 7/CeIB6K/UyA7ZYB3hp+vEtPiFJxA468g5stCzlmiMjxb/ETnzH40KWTmVXDvXub b1G5VtpggJR0O/tVFpqcX0qMXkoxF1cr/EYLWfgHXdP0tMctwY+qR127QKEUnCd3 hqOGydrjRMDwg58adY84yPSlwT/LEMB8vLAYXshT72WbAYycU087WXXSMoAi6yIE Bz+g5nH5WbzzEWFcx9FXNqYAGEsMq3KxMogTYT88Byd6w2NIaNf56v4oC/IAP1ui LcxMlviFPyjypg/Ty/giJPs1eKuKZWnFEP9BRrl0JJqG1vbRXvh8b+bp7s3a9rUT 4KNUbhak4ZDb8TjIcKxFcj0T4+F/XxeIijV8BXyE5Sc8oD8/Jl59k9szRmcWge0A EQEAAYkCPAQYAQgAJhYhBD/b8miy3HmpxCESukgeFEZUtL7iBQJbRb/3AhsMBQkJ ZgGAAAoJEEgeFEZUtL7iC2QP/RMe9QHT2QYn9yiw1PC7LaMvvCD6huCyjRiNf2Ys b3wlEDCIljtnSTuJzn5axwdGHKgKkZjTo/dAW4KJ33GpwQfGNB/RhMZ/6lfHZST4 Zo0oOJtZRClTeAUmvaBXQ5V8Fv4T3R9x0AD5CM3YDlNMGO8cmeoulcgogSP2BtVp YksTr0PqqojVgeZ4nejzJcV+UxF2DV5wwicojbR7DGu/neJNpRJnMgsG0ie8nRO6 elUy++R1mJ/+0BtI90MxB7nUmvnV/SzVSQU43iJlAKWRoQY/SnXulSysqtqtvf/p S9evjKCiEoF1hMgQIZdt3LMyab/YhlMwH9RUzZ+8OBvBsMFw+9oJ1NfpxH2o3FiV vLuho/T+MX8EezlhyS/LiaiPgFkI+xhMBstTje2O+ZCRMlpFt8lHZG2A1FOPQ/KJ o6fnKfNmT/D5fc1PCo2LOD5SXu4bYTgk3UEdRx/dvrb8u/Nn45eG1m8tE8KdhsQ1 gSCoSRsjW5MfPEPMHqKgFtc0/UaBpTSIpJ35NtVh9MD2EW1Gv8viRp6nh7YxlWKJ T/0WHMH+OgZ2TWy1Oz6Y5lbQyGdonKYh+aMqaXPNszXz37AGfUrkxFW070lr+XWC AmCldUIzLgVF4dKpIx2+NyaJTRtXNCgfN+zLu8de1p0FR8JBsjcOVDBlyNNERuX9 dJdX =5U14 -----END PGP PUBLIC KEY BLOCK-----

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Open Source Hackathon Mentorship Invitation
by Misha Patel 19 Feb '20

19 Feb '20

Hello, My name is Misha Patel and I’m reaching out on behalf of the HackIllinois Outreach team. HackIllinois is a 36-hour collegiate Open Source hackathon that takes place annually at the University of Illinois Urbana-Champaign. This year, it will be from February 28th-March 1st, 2020. Our mission is to introduce college students to Open Source, while giving back to the community. We strive to create a collaborative environment in which our attendees can learn from and work with developers to make their own contributions. In past years, we’ve had developers from prominent projects such as npm, Rust, and Apache come to mentor students from our pool of 900+ attendees. We’d love it if you could pass along this message to the Libvirt community or any individuals you believe would be interested. We will provide meals throughout the event and can reimburse for travel and lodging up to a certain amount depending on where in the US people are coming from. More information on mentorship can be found at hackillinois.org/mentor. You can also visit opensource.hackillinois.org to see what kinds of projects were represented at our event last year. We'd be more than happy to discuss this further. Please have any interested individuals contact us at opensource(a)hackillinois.org. Looking forward to hearing back! Best, Misha Patel HackIllinois 2020 Outreach Director misha.patel(a)hackillinois.org

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can hotplug vcpus to running Windows 10 guest, but not unplug
by Lentes, Bernd 18 Feb '20

18 Feb '20

Hi, i'm playing a bit around with vcpus. My guest is Windows 10 1903. This is the excerpt from the config: ... <vcpu placement='static' current='2'>4</vcpu> <vcpus> <vcpu id='0' enabled='yes' hotpluggable='no'/> <vcpu id='1' enabled='yes' hotpluggable='yes'/> <vcpu id='2' enabled='no' hotpluggable='yes'/> <vcpu id='3' enabled='no' hotpluggable='yes'/> </vcpus> ... I'm able to hotplug vcpus, but when i want to unplug them i get the following: virsh # setvcpus pathway 3 --live virsh # setvcpus pathway 4 --live virsh # setvcpus pathway 2 --live error: internal error: unable to execute QEMU command 'device_del': acpi: device unplug request for not supported device type: qemu64-x86_64-cpu Does anyone know why it can't be unplugged ? Thanks. Brtnf -- Bernd Lentes Systemadministration Institute for Metabolism and Cell Death (MCD) Building 35.34 - Raum 208 HelmholtzZentrum münchen bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/mcd Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum MÃ¼nchen Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir.in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671

5 7

Possible to use OVN networking and virtio simultaneously in the same VM?
by Andre Goree 16 Feb '20

16 Feb '20

I wanted to know if it's possible to use OVN networking and virtio simultaneously in the same VM? Or am I wasting my time trying to get it to work? When I try to define a VM and power it on with both types defined, networking fails to work on both. E.g.: <interface type='bridge'> <mac address='xx:xx:xx:xx:xx:xx'/> <source bridge='foo'/> <virtualport type='openvswitch'> </virtualport> <target dev='devfoo'/> </interface> <interface type='bridge'> <mac address='xx:xx:xx:xx:xx:xx'/> <source bridge='bar'/> <virtualport type='openvswitch'> </virtualport> <target dev='devbar'/> </interface> <interface type='bridge'> <mac address='xx:xx:xx:xx:xx:xx/> <source bridge='foo2'/> <model type='virtio'/> <target dev='devfoo2/> </interface> Notice the 'virtio' setting on the third NIC. If I remove that NIC from the xml or if set that NIC as a virtualport on openvswitch like the other two NICs, networking works fine. Am I missing something? Or is this a silly question to even ask?

2 2

PCI/GPU Passthrough with xen
by Christoph 15 Feb '20

15 Feb '20

Hi All, it is possible to use pci/gpu passthrough with xen and libvirt? If yes, how is the syntax? Can I get an example? -- ------ Greetz

3 6

ERROR Could not find an installable distribution at ....
by Kaushal Shriyan 14 Feb '20

14 Feb '20

Hi, I am trying to set up alpine Linux Guest OS using the below command #virt-install --name=mfecdrupalalphine --file=/linuxkvmguestosdisk/var/lib/libvirt/images/mfecdrupalalphine.img --file-size=100 --nonsparse --vcpus=2 --ram=6096 --network=bridge:br0 --os-type=linux --os-variant=alpinelinux3.8 --graphics none --location=/linuxkvmguestosdisk/var/lib/libvirt/isos/alpine-standard-3.11.3-x86_64.iso --extra-args="console=ttyS0" Starting install... Retrieving file .treeinfo... | 0 B 00:00:00 Retrieving file content... | 0 B 00:00:00 ERROR Could not find an installable distribution at '/linuxkvmguestosdisk/var/lib/libvirt/isos/alpine-standard-3.11.3-x86_64.iso': The URL could not be accessed, maybe you mistyped? The location must be the root directory of an install tree. See virt-install man page for various distro examples. Domain installation does not appear to have been successful. If it was, you can restart your domain by running: virsh --connect qemu:///system start mfecdrupalalphine otherwise, please restart your installation. The iso file do exist as per the below details ls -l /linuxkvmguestosdisk/var/lib/libvirt/isos/alpine-standard-3.11.3-x86_64.iso -rw-r--r-- 1 root root 127926272 Feb 12 17:49 /linuxkvmguestosdisk/var/lib/libvirt/isos/alpine-standard-3.11.3-x86_64.iso # Any clue? I look forward to hearing from you and thanks in advance. Best Regards, Kaushal

2 1

problems with understanding of the memory parameters in the xml file
by Lentes, Bernd 13 Feb '20

13 Feb '20

Hi guys, despite reading hours and hours in the internet i'm still struggling with "memory", "currentmemory" and "maxMemory". Maybe you can help me to sort it out. My idea is that a guest has an initial value of memory (which "memory" seems to be) when booting. We have some Windows 10 guests which calculate some stuff and i would like to increase memory during runtime until it reaches a fixed maximum value. My hope was that a higher "maxMemory" could solve this, that the guest claims more memory and gets it. I didn't get it. Is my idea wrong ? Do i need a balloon driver for that ? What i find concerning ballooning is that it doesn't work automatically but has to be adjusted manually. Is that right ? Balloon drivers for windows are available. Is my idea right, does that work basically ? If yes how do i have to set the parameters ? Is the memory released after the guest has e.g. finished his calculation ? Does that work automatically or do i have to adjust that manually ? Thanks. Bernd -- Bernd Lentes Systemadministration Institute for Metabolism and Cell Death (MCD) Building 35.34 - Raum 208 HelmholtzZentrum münchen bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/mcd Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum MÃ¼nchen Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir.in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671

2 2

does the guest have a snapshot ?
by Lentes, Bernd 11 Feb '20

11 Feb '20

Hi, i'm cuurently a bit confused if a guest does have a valid snapshot or not. This is the xml: ... <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/libvirt/images/crispor_1604/crispor_1604.sn'/> <backingStore type='file' index='1'> <format type='raw'/> <source file='/var/lib/libvirt/images/crispor_1604/crispor_1604.img'/> <backingStore/> </backingStore> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> ... both files are currently in access by the respective qemu process. lsof: qemu-kvm 19533 root 13u REG 253,0 29761732608 12091393 /var/lib/libvirt/images/crispor_1604/crispor_1604.sn qemu-kvm 19533 root 14r REG 253,0 111561775513 44793857 /var/lib/libvirt/images/crispor_1604/crispor_1604.img Here are both files: pc60181:/var/lib/libvirt/images/crispor_1604 # ll ... -rw------- 1 root root 111561775513 Oct 22 15:23 crispor_1604.img -rw-r--r-- 1 root root 29761732608 Feb 7 15:13 crispor_1604.sn crispor_1604.sn has a recent timestamp. The snapshot is currently in use: virsh # domblklist crispor_1604 Target Source ------------------------------------------------ vda /var/lib/libvirt/images/crispor_1604/crispor_1604.sn But virsh does not show any snapshot: virsh # snapshot-list crispor_1604 Name Creation Time State ------------------------------------------------------------ So i'm a bit confused. Does it have a valid snapshot or not. How can i find out and how can i get rid of it ? Thanks. Bernd -- Bernd Lentes Systemadministration Institute for Metabolism and Cell Death (MCD) Building 35.34 - Raum 208 HelmholtzZentrum münchen bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/mcd Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum MÃ¼nchen Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir.in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671

2 4

No DHCP on default network when guest has multiple interfaces
by Patrick O'Neill 08 Feb '20

08 Feb '20

Hello, I am trying to boot a VM in libvirt that has 2 interfaces. The first interface is connected to the default network and the second connects to a bridge interface on the host. When the VM boots the first interface doesn't receive an IP address from DHCP. It works when the VM only has one interface though. If I login to the VM using virsh console I noticed that in NetworkManager the connection name and device are mixed [root@localhost ~]# nmcli con show NAME UUID TYPE DEVICE eth0 cc31f368-0a43-4c85-bd15-6aaa3ca23b3d ethernet eth1 If I run 'dhclient eth0' the interface gets an IP address from the default network as expected. [root@localhost ~]# dhclient eth0 [root@localhost ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 52:54:00:00:01:00 brd ff:ff:ff:ff:ff:ff inet 192.168.122.10/24 brd 192.168.122.255 scope global dynamic eth0 valid_lft 3599sec preferred_lft 3599sec 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 52:54:00:48:e3:b8 brd ff:ff:ff:ff:ff:ff inet6 fe80::5054:ff:fe48:e3b8/64 scope link noprefixroute valid_lft forever preferred_lft forever The VM is created using the following command virt-install --import --name ${VM_HOST_NAME} \ --memory 2048 --vcpus 2 --cpu host \ --disk path=/var/lib/libvirt/images/${VM_HOST_NAME}.qcow2,format=qcow2,bus=virtio \ --network network=default \ --network bridge=bridge0,model=virtio \ --os-type=linux \ --os-variant=rhel7.6 \ --graphics none Any ideas what could cause this problem? The guest OS is CentOS 7.7 and the host is CentOS 8, but I have the same problem with a CentOS 7 hypervisor.

2 1

Does Libvirt's json parser support single quoted string in qmp json string?
by Peter Luo 05 Feb '20

05 Feb '20

Hi All, I’m using qmp command via “virsh qemu-monitor-command” to perform block related jobs. And in my case, I execute block-commit to commit the changes in the top image to the base image which is encrypted. So in the base parameter, I need a json string which is single quoted to support the encryption parameters. However, the virsh is failed to parse the whole json qmp command. Attempt 1: Single quote without backflash, failed root@host:~# virsh qemu-monitor-command i-9wdfw2x8 "{\"execute\": \"block-commit\", \"arguments\": { \"device\": \"drive-virtio-disk2\", \"job-id\": \"job100\", \"base\":'json:{\"encrypt.key-secret\":\"vol-38973xjl.secret\",\"driver\":\"qcow2\",\"file\":{\"driver\":\"file\",\"filename\":\"/pitrix/data/container/vol-38973xjl.img\"}}', \"top\": \"/pitrix/data/container/vol-38973xjl_ss-2tw7v0mm.img\"}}" error: internal error: cannot parse json {"execute": "block-commit", "arguments": { "device": "drive-virtio-disk2", "job-id": "job100", "base":'json:{"encrypt.key-secret":"vol-38973xjl.secret","driver":"qcow2","file":{"driver":"file","filename":"/pitrix/data/container/vol-38973xjl.img"}}', "top": "/pitrix/data/container/vol-38973xjl_ss-2tw7v0mm.img"}}: lexical error: invalid char in json text. , "job-id": "job100", "base":'json:{"encrypt.key-secret":"vo (right here) ------^ Attempt 2: Single quote with backflash, failed root@host:~# virsh qemu-monitor-command i-9wdfw2x8 "{\"execute\": \"block-commit\", \"arguments\": { \"device\": \"drive-virtio-disk2\", \"job-id\": \"job100\", \"base\":\'json:{\"encrypt.key-secret\":\"vol-38973xjl.secret\",\"driver\":\"qcow2\",\"file\":{\"driver\":\"file\",\"filename\":\"/pitrix/data/container/vol-38973xjl.img\"}}\', \"top\": \"/pitrix/data/container/vol-38973xjl_ss-2tw7v0mm.img\"}}" error: internal error: cannot parse json {"execute": "block-commit", "arguments": { "device": "drive-virtio-disk2", "job-id": "job100", "base":\'json:{"encrypt.key-secret":"vol-38973xjl.secret","driver":"qcow2","file":{"driver":"file","filename":"/pitrix/data/container/vol-38973xjl.img"}}\', "top": "/pitrix/data/container/vol-38973xjl_ss-2tw7v0mm.img"}}: lexical error: invalid char in json text. , "job-id": "job100", "base":\'json:{"encrypt.key-secret":"v (right here) ------^ My libvirt version is 5.7.0, libyajl is 2.1.0. Thanks, Peter Luo

6 9

USB devices with same vendor:product id
by Maxime Accadia 04 Feb '20

04 Feb '20

Hi, We have a VM with several USB devices attached. Everything works well, but sometimes, after a reboot of the host, some usb device get a different bus/device number and that prevent the reboot of the VM : ------- error: Failed to start domain xxx error: internal error: Did not find USB device 04b9:0300 bus:1 device:5 ------- I guess this is because we have multiple usb devices with the same vendor/product ID : ------- <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x04b9'/> <product id='0x0300'/> <address bus='2' device='4'/> </source> <alias name='hostdev0'/> <address type='usb' bus='0' port='2'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x0529'/> <product id='0x0001'/> <address bus='1' device='7'/> </source> <alias name='hostdev1'/> <address type='usb' bus='0' port='1.2'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x0529'/> <product id='0x0001'/> <address bus='2' device='3'/> </source> <alias name='hostdev2'/> <address type='usb' bus='0' port='1.4'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x04b9'/> <product id='0x0300'/> <address bus='1' device='6'/> </source> <alias name='hostdev3'/> <address type='usb' bus='0' port='1.1'/> </hostdev> ------- Any idea on how to handle this case ? We were thinking about using udev, but it seems that libvirt only supports vendor/id (not unique in our case) and bus/device (not predictable) to identify usb devices. Thanks, Maxime Accadia P.S. We use libvirt 4.0.0 on Ubuntu 18.04

3 4