March 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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Set hostname of guest during installation time
by john doe 05 Nov '20

05 Nov '20

Hi, I would like to set the hostname when installing a guest, with the below command the hostname is not set to 'try06' in the guest: virt-install --name=try06 --graphic none --pxe --network bridge=virbr0 How can I set the hostname of the guest during installation time? I realy appriciate the support I'm getting in here, I'm fairly new to libvirt. -- John Doe

4 24

[libvirt-users] Live migrate + change interface name
by Marc Roos 07 Oct '20

07 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?

2 4

[libvirt-users] Add Virtlyst to the list of libvirt users
by Daniel Nicoletti 23 Sep '20

23 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

4 5

guest-fsfreeze-freeze freezes all mounted block devices
by Marc Roos 09 Aug '20

09 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?

5 15

[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

2 1

Could you please help with questions about the net failover feature
by Yalan Zhang 09 Jul '20

09 Jul '20

Hi laine, I have leave some questions on IRC, but my VPN broken time after time. Please ignore the questions on IRC. In my understanding, the standby and primary hostdev interface may be in different subnet. I'm not sure whether it is correct. Could you please help to explain? Thank you in advance. For example, primary hostdev is connected to vf-pool with <pf='eth0'/>, while the standby is connected to NAT network with " forward dev='eth0'". The standby interface will get ip as 192.168.122.x, but after NAT, it will be in the same subnet of the vf. So after the VF is unplugged, the packet will still broadcast in the same subnet, and the vm will get the packet as the standby share the same mac. Right? Thank you! ------- Best Regards, Yalan Zhang IRC: yalzhang

4 7

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

2 13

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-…>

2 3

Ovs error when starting vm: ovs-vsctl: 'del-port' command requires at least 1 arguments
by Thomas Pircher 16 Apr '20

16 Apr '20

Hi, my system got updated to libvirt 6.0.0 (from 5.6.0) this morning, and now I'm having problems starting VMs that make use of openvswitch portgroups. When I start a VM, I get this error message on virsh: > virsh # start testvm > error: Failed to start domain testvm > error: An error occurred, but the cause is unknown The system log contains: > Mar 30 09:45:39 tplinux ovs-vsctl[2763]: ovs|00001|db_ctl_base|ERR|'del-port' command requires at least 1 arguments > Mar 30 09:45:39 tplinux libvirtd[735]: internal error: Child process (ovs-vsctl --timeout=5 -- --if-exists del-port) unexpected exit status 1: ovs-vsctl: 'del-port' command requires at least 1 arguments > Mar 30 09:45:39 tplinux libvirtd[735]: internal error: Unable to delete port (null) from OVS My network "test-net" looks like: > <network> > <name>test-net</name> > <forward mode='bridge'/> > <bridge name='test-net'/> > <virtualport type='openvswitch'/> > <portgroup name='fabric' default='yes'> > <vlan trunk='yes'> > <tag id='10' nativeMode='untagged'/> > <tag id='20'/> > <tag id='30'/> > <tag id='40'/> > <tag id='50'/> > <tag id='60'/> > <tag id='70'/> > </vlan> > </portgroup> > </network> And the network in the domain xml file is: > <interface type='network'> > <mac address='01:23:45:67:89:ab'/> > <source network='test-net' portgroup='fabric'/> > <model type='e1000'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> > </interface> I didn't see any change in the changelog related to ovs or portgroups. Is there something I need to change in my VM definition? Thanks, Thomas

2 3

How to perform an in-place upgrade for libvirt
by FuLong Wang 31 Mar '20

31 Mar '20

Hello Experts, Is it possible to perform an in-place upgrade for libvirt. Assume, i have a CentOS 8 installation (choose server with GUI) with libvirt version 4.5.1 and i want to upgrade the libvirt to version 6.0.0, how to implement a perfect replacement for all the related files (libraries, header files, etc)? Does anybody here has the experience for this? Many Thanks! -- FuLong Wang fulong.wang(a)cn.ibm.com IBM China Systems Lab, Beijing, China _______________________________________________

2 2

"configure: error: Unable to find <rpc/rpc.h>" when compiling libvirt 6.0.0 from a release tarball
by FuLong Wang 31 Mar '20

31 Mar '20

Hello Experts, I'm trying to compiling libvirt 6.0.0 on an CentOS 8 env by following the guide here. (https://libvirt.org/compiling.html#compiling) When running the configure command, i encountered the issue of showing "configure: error: Unable to find <rpc/rpc.h>": How can i let the configure command to realize the non-standard header file location of portablexdr library? Could anyone kindly give some clue to resolve this? Thanks in advance! Install portablexdr was successfull. [root@centos8 portablexdr-4.9.1]# make install make install-am make[1]: Entering directory '/root/portablexdr-4.9.1' make[2]: Entering directory '/root/portablexdr-4.9.1' test -z "/usr/local/lib" || /usr/bin/mkdir -p "/usr/local/lib" /bin/sh ./libtool --mode=install /usr/bin/install -c 'libportablexdr.la' '/usr/local/lib/libportablexdr.la' libtool: install: /usr/bin/install -c .libs/libportablexdr.so.0.0.0 /usr/local/lib/libportablexdr.so.0.0.0 libtool: install: (cd /usr/local/lib && { ln -s -f libportablexdr.so.0.0.0 libportablexdr.so.0 || { rm -f libportablexdr.so.0 && ln -s libportablexdr.so.0.0.0 libportablexdr.so.0; }; }) libtool: install: (cd /usr/local/lib && { ln -s -f libportablexdr.so.0.0.0 libportablexdr.so || { rm -f libportablexdr.so && ln -s libportablexdr.so.0.0.0 libportablexdr.so; }; }) libtool: install: /usr/bin/install -c .libs/libportablexdr.lai /usr/local/lib/libportablexdr.la libtool: install: /usr/bin/install -c .libs/libportablexdr.a /usr/local/lib/libportablexdr.a libtool: install: chmod 644 /usr/local/lib/libportablexdr.a libtool: install: ranlib /usr/local/lib/libportablexdr.a libtool: finish: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/sbin" ldconfig -n /usr/local/lib ---------------------------------------------------------------------- Libraries have been installed in: /usr/local/lib If you ever happen to want to link against installed libraries in a given directory, LIBDIR, you must either use libtool, and specify the full pathname of the library, or use the `-LLIBDIR' flag during linking and do at least one of the following: - add LIBDIR to the `LD_LIBRARY_PATH' environment variable during execution - add LIBDIR to the `LD_RUN_PATH' environment variable during linking - use the `-Wl,-rpath -Wl,LIBDIR' linker flag - have your system administrator add LIBDIR to `/etc/ld.so.conf' See any operating system documentation about shared libraries for more information, such as the ld(1) and ld.so(8) manual pages. ---------------------------------------------------------------------- test -z "/usr/local/bin" || /usr/bin/mkdir -p "/usr/local/bin" /bin/sh ./libtool --mode=install /usr/bin/install -c 'portable-rpcgen' '/usr/local/bin/portable-rpcgen' libtool: install: /usr/bin/install -c portable-rpcgen /usr/local/bin/portable-rpcgen test -z "/usr/local/include" || /usr/bin/mkdir -p "/usr/local/include" * /bin/sh /root/portablexdr-4.9.1/install-sh -c -m 644 'rpc/rpc.h' '/usr/local/include/rpc/rpc.h'** ** /bin/sh /root/portablexdr-4.9.1/install-sh -c -m 644 'rpc/types.h' '/usr/local/include/rpc/types.h'** ** /bin/sh /root/portablexdr-4.9.1/install-sh -c -m 644 'rpc/xdr.h' '/usr/local/include/rpc/xdr.h'* make[2]: Leaving directory '/root/portablexdr-4.9.1' make[1]: Leaving directory '/root/portablexdr-4.9.1' [root@centos8 portablexdr-4.9.1]# configure command report can't find the <rpc/rpc.h> checking for how to force completely read-only GOT table... -Wl,-z -Wl,relro -Wl,-z -Wl,now checking for how to avoid indirect lib deps... -Wl,--no-copy-dt-needed-entries checking for how to stop undefined symbols at link time... -Wl,-z -Wl,defs checking sys/acl.h usability... no checking sys/acl.h presence... no checking for sys/acl.h... no checking for aa_change_profile in -lapparmor... no checking for pthread_mutexattr_init... yes checking for pthread.h... (cached) yes checking whether pthread_sigmask does anything... yes checking for atomic ops implementation... gcc checking for getxattr in -lattr... no checking for audit_encode_nv_string in -laudit... no checking for pkg-config... /usr/bin/pkg-config checking pkg-config is at least version 0.9.0... yes checking whether rl_completion_quote_character is declared... no checking for BLKID... no checking for capng_updatev in -lcap-ng... no checking for CURL... no checking for DBUS... no checking for DEVMAPPER... no checking for dm_task_run in -ldevmapper... no checking for dlfcn.h... (cached) yes checking for library containing dlopen... -ldl checking for whether to install firewalld libvirt zone... no checking for FUSE... no checking for GLIB... yes checking for GLUSTERFS... no checking for GNUTLS... yes checking for HAL... no checking for LIBISCSI... no checking whether to compile with macvtap support... yes checking whether MACVLAN_MODE_PASSTHRU is declared... yes checking for LIBNL... yes checking for LIBNL_ROUTE... yes checking for LIBPARTED... no checking libpcap pcap-config >= 1.0.0 ... no checking for LIBSSH... no checking for LIBXML... yes checking whether to compile with macvtap support... yes checking whether MACVLAN_MODE_PASSTHRU is declared... (cached) yes checking for NETCF... no checking for gettext... yes checking libintl.h usability... yes checking libintl.h presence... yes checking for libintl.h... yes checking for xgettext... xgettext checking for msgfmt... msgfmt checking for msgmerge... msgmerge checking msgfmt is GNU tool... yes checking for numa_available in -lnuma... no checking for numa_bitmask_isbitset in -lnuma... no checking for OPENWSMAN... no checking for PCIACCESS... no checking for init script type... systemd checking for pkcheck... /usr/bin/pkcheck checking for pthread_mutexattr_init... (cached) yes checking for pthread.h... (cached) yes checking whether pthread_sigmask does anything... (cached) yes checking whether rl_completion_quote_character is declared... (cached) no checking for sanlock_init in -lsanlock_client... no checking for SASL... no checking for fgetfilecon_raw in -lselinux... no checking for SSH2... no checking for UDEV... no checking whether to compile with virtual port support... yes checking for WIRESHARK_DISSECTOR... no *checking for xdrmem_create in -lportablexdr... yes** **checking for xdr_u_int64_t... no** **checking where to find <rpc/rpc.h>... missing** **configure: error: Unable to find <rpc/rpc.h>* [root@centos8 build]# -- FuLong Wang fulong.wang(a)cn.ibm.com IBM China Systems Lab, Beijing, China _______________________________________________

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Masking out the Protected Processor Identification Number
by procmem＠riseup.net 28 Mar '20

28 Mar '20

Hi I was wondering if libvirt/KVM screens out a CPU's or Protected Processor Identification Number? - "PPIN" is a universal hardware serial number etched into the chip in the fab. [1] I am currently allowing full host cpu passthrough to allow guests to use spectre/meltdown mitigations. However as we are a privacy project, we are looking to prevent obvious identity linkers like serial numbers from being read by untrusted environments. Apparentlt Intel has had it for years and its accessible with the mcelog daemon. [1] https://www.phoronix.com/scan.php?page=news_item&px=AMD-PPIN-Processor-ID-L…

1 0

Escape character
by john doe 27 Mar '20

27 Mar '20

Hi, I'm trying to understand how to use the escape character '^]' with the below command: virt-install --name=try06 --graphic none --pxe --network bridge=virbr0 --console pty,target_type=serial "Starting install... Connected to domain try06 Escape character is ^]" When I try to do '^]', it does not escape. The '--console' option makes no difference. In other words, what is the best way to get back to the host from a broken guest installation. I'm remotely connected to this server using SSH and doing '~.' quits the SSH connection. Any help is appriciated. -- John Doe

5 8

Create VM w/ cache=none on tmpfs
by Miguel Duarte de Mora Barroso 27 Mar '20

27 Mar '20

Hi, I've seen that in the past, libvirt couldn't start VMs when the disk image was stored on a file system that doesn't support direct I/O having the 'cache=none' configuration [0]. On the KubeVirt project, we have some storage tests on a particular provider which does just that - try to create / start a VM whose disk is on tmpfs and whose definition features 'cache=none'. The behavior we're seeing is that libvirt throws this warning: ``` Unexpected Warning event received: testvmig4zsxc2f8swkxv22xkhx2vrb4ppqbfdfgfgqh5gq8plqzrv5,853ff3d9-70d4-43c5-b9ff-4d5815ea557d: server error. command SyncVMI failed: "LibvirtError(Code=1, Domain=10, Message='internal error: process exited while connecting to monitor: 2020-03-25T10:09:21.656238Z qemu-kvm: -drive file=/var/run/kubevirt-ephemeral-disks/disk-data/disk0/disk.qcow2,format=qcow2,if=none,id=drive-ua-disk0,cache=none: file system may not support O_DIRECT\n2020-03-25T10:09:21.656391Z qemu-kvm: -drive file=/var/run/kubevirt-ephemeral-disks/disk-data/disk0/disk.qcow2,format=qcow2,if=none,id=drive-ua-disk0,cache=none: Could not open backing file: Could not open '/var/run/kubevirt-private/vmi-disks/disk0/disk.img': Invalid argument')" ``` But actually proceeds, and is able to start the VM - but seems it coerces the cache value to writeThrough. Is this the expected behavior ? e.g. cache = none can't be used when the disk images are on a tmpfs file system ? I know it was, not sure about now (libvirt-5.6.0-7) ... [0] - https://bugs.launchpad.net/nova/+bug/959637

2 2

Question about local migration between containers
by Or Shoval 26 Mar '20

26 Mar '20

Hello On kubevirt project we are using IpV6 Kind cluster, and trying to support migration, but since both of the containers are on the same host we get this error {"component":"virt-launcher","level":"error","msg":"internal error: Attempt to migrate guest to the same host 32323136-3731-4247-3831-303946353338","pos":"virNetClientProgramDispatchError:172","subcomponent":"libvirt","thread":"44", "timestamp":"2020-03-25T10:41:12.123000Z"} Is there a way to work around this please ? it comes of course from https://github.com/libvirt/libvirt/blob/master/src/qemu/qemu_migration_cook… (not sure what version of libvirt i have but it shows the uuid so i guess this is the one) Thanks

2 4

protocol method available on Windows
by john doe 26 Mar '20

26 Mar '20

Hi libvirts, I'm playing with libvirt on Windows (downloaded the x64 msi) but I'm stuck at the following: virsh # net-edit default error: failed to connect to the hypervisor error: invalid argument: transport methods unix, ssh and ext are not supported under Windows Can someone shed some light on what transport method I should use? Any help is appriciated. P.S. I'm not subscribed to the list. -- John Doe

2 2

libvirt dynamic file ownership
by Joe Muro 25 Mar '20

25 Mar '20

3 6

how can i get enough mem stat detai from win7 vm with virtio-win driver install and blnsrv started ?
by thomas.kuang 24 Mar '20

24 Mar '20

hi，every one I have some trouble with the virsh to get vm mem-usage in guest os. [root@localhost ~]# virsh list --all Id Name State 1 wwl_centos7_1708 running 2 windows-virtio-template running I create two vms one guest os is centos, the other is window 7 virsh dommemstat wwl_centos7_1708 actual 4194304 swap_in 0 swap_out 0 major_fault 194 minor_fault 219454 unused 3729588 available 3881812 last_update 1581406529 rss 2969400 so i can get the vm mem-used detail, but if my guest os is windows, though I install virtio-win driver and run blnsrv.exe -i start the service, I fail to get not enough vm mem stat info, as following: virsh dommemstat windows-virtio-template actual 8388608 last_update 1584947706 rss 8263664 can anyone tell me how can I succ to get window's vm with enough mem stat info the same with centos ? thanks u !

1 0

Fwd: KVM hook
by Aditya Sahu 21 Mar '20

21 Mar '20

Hi Team , I am reaching out to you seeking your help for one of my KVM hook script. I am using /etc/libvirt/hooks/network file to trigger an event when a network is created or deleted ( https://www.libvirt.org/hooks.html ). Basically I using a rest call to create the same network in my Infoblox appliance for the network monitoring. However every time I create a network only $2== start or $2==started gets invoked, i have tried pretty much every combination and permutation but did not get any success. I checked the libvirtd.log and found that only $2== start or $2==started gets invoked. In my case i would like to get network created in infoblox appliance as and when it gets created in the KVM and should get deleted as and when it gets deleted from the KVM. Here is snippet of my script #!/bin/bash network_name=`xml_grep --text_only hookData/network/name /etc/libvirt/hooks/net_details` network=`xmllint --xpath hookData/network/ip/@address /etc/libvirt/hooks/net_details|cut -d "=" -f2|tr -d '"'` network_mask=`ipcalc $network |awk '/Network/{print$2}'` if [[ $2=="begin" ]] || [[ $2=="start" ]] || [[ $2=="started" ]]; then curl -k -u admin:infoblox -H "content-type: application/json" -X POST " https://10.196.200.63/wapi/v2.10/network?_return_fields%2B=network&_return_…" -d '{"network": "'$network_mask'"}' network_ref=`curl -k -s -u admin:infoblox -H 'content-type: application/json' -X GET ' https://10.196.200.63/wapi/v2.10/network?_return_fields%2B=network&_return_… '| grep $network_mask| awk -v RS=" " '/_ref/{getline;print$1}' |cut -d "/" -f2-3` else curl -k -u admin:infoblox -H 'content-type: application/json' -X DELETE "https://10.196.200.63/wapi/v2.10/network/$network_ref/default" fi ----------------------------------------------------------------------------------------------------------------------- This script works perfectly fine and creates the network however when i delete the network it does not get deleted from the infoblox appliance. As i mentioned when tailed the libvirtd.log I found that the API to create network gets executed when the network is stopped. Attaching libvirted.log snippet [image: image.png] In this screen shot, stopped hook is triggered but still network creation API is fired which has errored out. Any guidance or help is highly appreciated. -Aditya

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Google Summer of Code - Redfish API implementation
by GUOQING LI 20 Mar '20

20 Mar '20

Hi libvirt crews I am a 4th year Software Engineering student from ChiangMai University, Thailand. Currently, I am doing a research internship at nara institute of science and technology, Japan. I have been working on a research that is related to the performance and security characteristics of various container technologies like Linux containers, gVisor , firecracker, kanta etc. It is supposed to be finished by the middle of next April. I am hoping to get involved with libvirt opensource project before I start my master program in October. I am interested in the Redfish API implementation project suggested by Cédric Bosdonnat. It's a nice modern RESTFUL JSON API which should not be very challenging to work with Python. It seems like There is already a Redfish API client <https://pythonhosted.org/python-redfish/readme.html> written in Python, Do you think it would be a good idea to use it to test the API on server side as i implemented through it ? It would be great If I can get in touch with Cédric Bosdonnat and have further discussion. Any suggestions about the project proposal would be much appreciated. Best regards,🙂 Lee <https://www.dmtf.org/sites/default/files/standards/documents/DSP0266_1.9.0.…>

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Problems with libvirt for MIPS
by Computers Issues 19 Mar '20

19 Mar '20

Hello. It's my first time here, so I'm so sorry if I make mistakes with how I'm sending or posting this. I wanted to ask about some problems I've found with other people, working with libvirt. We wanted to create a new virtual machine under MIPS architecture, using Qemu and libvirt. We are able to create the machine, and it boots, but never gets an IP. I'll leave the commands we've used, for the case someone knows what could be wrong. Qemu commands: libvirt+ 41690 25.0 11.5 837532 147992 ? Sl 14:15 0:04 /usr/bin/qemu-system-mips -name guest=MIPS_32,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-137-MIPS_32/master-key.aes -machine malta,accel=tcg,usb=off,dump-guest-core=off -m 256 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid eef94af7-4f20-4a00-9ae9-9b4133c1783b -display none -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-137-MIPS_32/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -kernel ~/vmlinux -append root=/dev/hda -device piix3-usb-uhci,id=usb,bus=pci,addr=0x2 -drive file=~/rootfs.ext2,format=raw,if=none,id=drive-ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device pcnet,netdev=hostnet0,id=net0,mac=52:54:00:09:a4:38,bus=pci,addr=0x1 -device virtio-balloon-pci,id=balloon0,bus=pci,addr=0x3 -device pcnet -netdev user,id=net1 -msg timestamp=on Thanks anyway!!!

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pointer to "spice" device by virNodeDeviceLookupByName
by Андрей Фокин 18 Mar '20

18 Mar '20

Is possible to get a pointer to «spice» by virNodeDeviceLookupByName API? What «name» I should use for? Thanks a lot! -- Андрей Фокин

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live storage migration using blockcopy
by Jing-Wei Su 16 Mar '20

16 Mar '20

Hello, I'm seeking the solution to live storage migration using blockcopy. Previously, the "virsh undefine" is required before blockcopy. https://www.redhat.com/archives/libvirt-users/2015-October/msg00027.html QEMU has "block-dirty-bitmap-*" operations now, are there steps for the live storage migration using blockcopy without undefine? By the way, why's the purpose of "undefine" before blockcopy? Thanks. Sincerely, Jing-Wei

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changing memory size with virsh setmem - results only visible in domain, not on host
by Lentes, Bernd 07 Mar '20

07 Mar '20

Hi, i have a Linux domain (Ubuntu 14.04) where we like to be able to change the amount of usable memory. We have a balloon device and statistics are switched in 5 sec. rhythm. The domain shows very quickly changes (following top) when we change the memory size with setmem, but the host does not show changes in the use of memory for the respective domain. Is that expected behavior ? Host is SLES 12 SP4, libvirt is 4.0.0-8.15.2 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

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KVM on CentOS 7 - sluggish performance with Win10 Guest
by Benjammin2068 06 Mar '20

06 Mar '20

Hey all, I've been running a Win10 Pro (64bit) guest for some time now.... and originally it was pretty snappy and I had no complaints. Somewhere in about the last 3-6 months I've been noticing sluggish performance -- but not overall. The system is mostly remote so I do a lot of my admin via RDP or the local console with the KVM Manager. I recently did a complete fresh install of Win10 Pro (1909. Previous install was 1607) and both show the same problem. The ONLY real thing running on this VM is Milestone's surveillance system (standalone host). Where I see the "sluggish" is: Connecting to milestone mobile server (either through web browser or client). for the small number of cameras, the connection spool up takes like 15 seconds which is noticeably longer than other systems I have set up with more load/tasks in terms of cameras. This used to be speedy and fine. The other place I see sluggish operation is on the desktop doing some typical tasks and seeing "not responding" in the window of the task that goes away - but should it ever appear to begin with? The system is a Supermicro motherboard with Dual Intel(R) Xeon(R) CPU E5-2640 v4 @ 2.40GHz w/64GB The Guest is provided with 20 cores in a config of 1 CPU, 10 cores - 2 threads per core. There are dedicated NICs (dual NIC card) attached to the system via macvtap (and are not used by CentOS in any way except to pass through to this Guest) I'm using QCOW2 for the base OS. The storage volume for video are raw devices. Once a process is running, performance seems fine... it seems to be starting processes or something. I'm not sure -- and I'm not as intimate with KVM/libvirt as I'd like to be yet. So I'm wondering if there's any performance tweaks I should know about. I've read about using .img vs .qcow2 already. I'm using virt-io drivers to some extent.... but is there anything else I'm missing? Thanks in advance, -Ben

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upgrading from fedora29 to fedora 31
by Thierry Parmentelat 05 Mar '20

05 Mar '20

Hi there I am using libvirt+lxc on fedora I just upgraded a couple boxes from f29 to f31 i am running into rather puzzling glitches on one of the boxes, and am having a hard time trying to figure what exactly is going wrong symptom being that on the faulty box, my 3 containers startup correctly, but all of them stop after some random time shortly after (approx. in the 5-10 minutes) in some cases I even lose one of the containers (its name no longer shows up in `virsh list —all` and I need to reboot the box to reinstate it is there any known issue with libvirt/lxc on fedora 31 ? ***** here’s the little that I’ve been able to figure out so far by myself * I have turned on debugging of libvirtd as per the docs log_filters="3:remote 4:event 3:util.json 3:rpc 1:*" log_outputs="1:file:/var/log/libvirt/libvirtd.log” and am digging in that log file, as well as the system journal, and the containers journals, to try and find some correlation; * I have seen an error message saying this > virNetSocketReadWire:1850 : End of file while reading data: Input/output error and that could be related to the problem; ***** this is really annoying and any hint would be hugely appreciated — thanks in advance

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Virtio-disk with driver from Microsoft from 2006 ?
by Lentes, Bernd 05 Mar '20

05 Mar '20

Hi, i wanted to benchmark a windows guest, compare standard driver and virtio driver. I installed the domain first with an IDE disk. I followed https://pve.proxmox.com/wiki/Paravirtualized_Block_Drivers_for_Windows to install the virtIO driver. In the device manager my VirtIO disk is recognized as a VirtIO SCSI disk from RedHat which seems ok for me. But the driver is, following the device manager, a driver from Microsft from 21/06/2006, version 10.0.18362.1. That's strange in my eyes. This driver is outdated and not from RedHat or Fedora, what i expected. Also updating the driver and pointing to the CD, even the respective folder, didn't work. It says the driver is the most recent. I used the virtIO-ISO 0.1.173, Windows 10 64bit Edition 1903. 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

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Guests automatically stuck on pause
by JT Edwards 05 Mar '20

05 Mar '20

I have forced off the guest and started them again only to get this error Error unpausing domain: internal error: unable to execute QEMU command 'cont': Resetting the Virtual Machine is required Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/asyncjob.py", line 111, in tmpcb callback(*args, **kwargs) File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line 66, in newfn ret = fn(self, *args, **kwargs) File "/usr/share/virt-manager/virtManager/object/domain.py", line 1311, in resume self._backend.resume() File "/usr/lib/python3/dist-packages/libvirt.py", line 2174, in resume if ret == -1: raise libvirtError ('virDomainResume() failed', dom=self) libvirt.libvirtError: internal error: unable to execute QEMU command 'cont': Resetting the Virtual Machine is required Ubuntu: 5.4.0-14-generic #17-Ubuntu SMP Thu Feb 6 22:47:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux libvirt: libvirtd (libvirt) 6.0.0 Thanks in advance JT

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kvm presenting wrong CPU Topology for cache
by Satish Patel 01 Mar '20

01 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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