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How to perform an in-place upgrade for libvirt
by FuLong Wang 01 Apr '20

01 Apr '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 29 Mar '20

29 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 28 Mar '20

28 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 27 Mar '20

27 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 27 Mar '20

27 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 22 Mar '20

22 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

1 0

Google Summer of Code - Redfish API implementation
by GUOQING LI 21 Mar '20

21 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.…>

1 0

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

20 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!!!

1 0

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

3 4

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

2 1

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 07 Mar '20

07 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

1 0

upgrading from fedora29 to fedora 31
by Thierry Parmentelat 06 Mar '20

06 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

2 1

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

1 1

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

1 0

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.

1 1

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.

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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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