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domain: how long is new xml in saved file
by Vincent Wu 27 Apr '20

27 Apr '20

Hi administrator, I am a cloud compute developer. I need some help from you about libvirt. I have a work to modify a image file which is saved by virDomainSave() or virDomainSaveFlags(). So virDomainSaveImageGetXMLDesc() and virDomainSaveImageDefineXML() are APIs I choosed to do. Because I found a sentence: A save file can be inspected or modified slightly with virDomainSaveImageGetXMLDesc() and virDomainSaveImageDefineXML(). But an error is happened when I do like that.  libvirt: QEMU Driver error: operation failed: new xml too large to fit in file. I found that if I increase strlen(xml_old) to strlen(xml_new). if (strlen(xml_new) - strlen(xml_old) <= 29) { this is right; } but if (strlen(xml_new) - strlen(xml_old) >= 50) { this is error; } But I don't choose to find an accurate number.  I think this value will be affected by some factors. For example: memory alignment, range safety or other rules. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ +                                                           strlen(xml_old)                                                  +  free space  + ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ +                                                             strlen(xml_new)                                                                     + ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ I really want to know how long free space I can use. Can you convert slightly to a precise number? Thank you for taking so long to read my Email. Looking forward to your reply. ps: OS: CentOS7.4 libvirt: 4.5.0 hypervisor: KVM Sincerely,  Vincent Wu

5 5

Not able to add pcie card to guest: Operation not permitted
by Mauricio Tavares 25 Apr '20

25 Apr '20

Let's say I have libvirt [root@vmhost2 ~]# virsh version Compiled against library: libvirt 4.5.0 Using library: libvirt 4.5.0 Using API: QEMU 4.5.0 Running hypervisor: QEMU 2.12.0 [root@vmhost2 ~]# running on centos 8 and then I have this card [root@vmhost2 ~]# virsh nodedev-dumpxml pci_0000_01_00_0 <device> <name>pci_0000_01_00_0</name> <path>/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0</path> <parent>pci_0000_00_01_0</parent> <driver> <name>mlx4_core</name> </driver> <capability type='pci'> <domain>0</domain> <bus>1</bus> <slot>0</slot> <function>0</function> <product id='0x1003'>MT27500 Family [ConnectX-3]</product> <vendor id='0x15b3'>Mellanox Technologies</vendor> <iommuGroup number='1'> <address domain='0x0000' bus='0x00' slot='0x01' function='0x0'/> <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </iommuGroup> <pci-express> <link validity='cap' port='8' speed='8' width='8'/> <link validity='sta' speed='5' width='8'/> </pci-express> </capability> </device> which I added to the guest (arch='x86_64' machine='pc-q35-rhel7.6.0') as <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x08' slot='0x00' function='0x0'/> </hostdev> When I try to start the guest I get the following error message: [root@vmhost2 ~]# virsh start testfedora error: Failed to start domain testfedora error: internal error: qemu unexpectedly closed the monitor: 2020-04-24T20:01:35.341020Z qemu-kvm: -device vfio-pci,host=01:00.0,id=hostdev0,bus=pci.8,addr=0x0: vfio error: 0000:01:00.0: failed to setup INTx fd: Operation not permitted [root@vmhost2 ~]# Why is it telling me that is not permitted?

2 3

Virsh migrate and paused vm
by Paras Pradhan 24 Apr '20

24 Apr '20

Hello I have a question regarding virsh migrate. I see this when I migrate a vm using the command --- virsh --connect=xen:///system migrate --live --verbose vm1 xen+ssh://node2/system --- I see the vm keeps running on node1 and on node2 its paused. Libvirt version is 5.1.0-8.11.6.x86_64 and hypervisor is Xen 4.12. No issues when running --- xl migrate vm1 node2 --- Any help is appreciated. Thanks P

2 1

php libvirt show active snapshot
by Todd Lewis 21 Apr '20

21 Apr '20

Is php libvirt able to list the active snapshot for the vm? I can easily take snapshots and restore snapshots, but I can't figure out how to display the currently active snapshot using php libvirt. -- Todd Lewis Grizzly Star (469) 363-2907 Cell www.grizzlystar.com

3 7

My VMs don't get IP with libvirt and dnsmasq
by Computers Issues 17 Apr '20

17 Apr '20

Hello there, I wanted to share a problem I'm having with libvirt, for the case someone here could know how to solve it. I'm using an Ubuntu 18.04 LTS, I have libvirtd already installed and I think I got all the dependencies installed. So, I'm using virsh net-create to create this network: <network> <name>pepito</name> <forward mode='nat'/> <bridge name='virbr2' stp='on' delay='0'/> <ip address='192.168.150.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.150.2' end='192.168.150.254'/> </dhcp> </ip> </network> And then I create a domain with this xml: <domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> <name>ARM</name> <memory unit='KiB'>262144</memory> <currentMemory unit='KiB'>262144</currentMemory> <os> <type arch='armv7l' machine='virt-2.9'>hvm</type> <kernel>~/zImage</kernel> <cmdline>console=ttyAMA0 root=/dev/vda</cmdline> <boot dev='hd'/> </os> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-system-aarch64</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file=' ~/rootfs.qcow2'/> <target dev='hda' bus='virtio'/> </disk> <controller type='virtio-serial' index='0'> <address type='virtio-mmio'/> </controller> <interface type='network'> <mac address='52:54:00:09:a4:37'/> <model type='virtio'/> <source network='pepito'/> <address type='virtio-mmio'/> </interface> </devices> <qemu:commandline> <qemu:arg value='-device'/> <qemu:arg value='virtio-net-pci'/> <qemu:arg value='-netdev'/> <qemu:arg value='user,id=net1'/> </qemu:commandline> </domain> They both work as I created them in a different computer and everything works. But I'm trying it on my other Ubuntu machine, and once virsh creates the network and the domain, my VM never get an IP from that DHCP range. This is libvirtd log: abr 17 00:48:11 usuario-System-Product-Name dnsmasq-dhcp[13741]: DHCP, IP range 192.168.150.2 -- 192.168.150.254, lease time 1h abr 17 00:48:11 usuario-System-Product-Name dnsmasq-dhcp[13741]: DHCP, sockets bound exclusively to interface virbr2 abr 17 00:48:11 usuario-System-Product-Name dnsmasq[13741]: reading /etc/resolv.conf abr 17 00:48:11 usuario-System-Product-Name dnsmasq[13741]: using nameserver 127.0.0.53#53 abr 17 00:48:11 usuario-System-Product-Name dnsmasq[13741]: read /etc/hosts - 7 addresses abr 17 00:48:11 usuario-System-Product-Name dnsmasq[13741]: read /var/lib/libvirt/dnsmasq/pepito.addnhosts - 0 addresses abr 17 00:48:11 usuario-System-Product-Name dnsmasq-dhcp[13741]: read /var/lib/libvirt/dnsmasq/pepito.hostsfile Does anybody know why it could be that the VM never gets an IP from the range I defined? As I said, exactly the same configuration worked in a different machine, I don't know why it does not work here. Thank you so much!! <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> Libre de virus. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

3 8

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

FYI: upstream bug reporting now using https://gitlab.com/libvirt
by Daniel P. Berrangé 16 Apr '20

16 Apr '20

In keeping with our general aim to consolidate libvirt project infrastructure services on GitLab, we now wish to have issues for upstream libvirt projects reported on the appropriate https://gitlab.com/libvirt/ repository issue tracker. For further details see: https://libvirt.org/bugs.html Bugs against OS distro provided binary packages should continue to be filed against the OS distros' own bug trackers unless the problem is known to also affect current upstream libvirt versions. Note that as part of this change, the "Virtualization Tools" component on bugzilla.redhat.com has been updated to remove the ability to file new bugs against libvirt related components. Existing bugs there still exist in bugzilla, but new bugs can only be filed against gitlab.com. Over time we hope to triage old bugs and close those that are either invalid, or those not likely to be addressed given current maintainer resources available. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|

1 0

what a correct use for virConnectDomainEventRegisterAny API, how to Obtain a stable expected result
by thomas.kuang 15 Apr '20

15 Apr '20

HI, everyone: My target deal with network hotplug use virDomainDetachDeviceFlags. Because when the API return ,the network maybe doesn’t remove from my vm guest os. So I use virConnectDomainEventRegisterAny to register an event ID: VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED , my process as follow: cb_para->call_id=virConnectDomainEventRegisterAny(cb_para->conn,cb_para->dom,VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED, VIR_DOMAIN_EVENT_CALLBACK(vnf_control_del_network_cb), cb_para, vnf_control_del_network_cb_free); flags |= VIR_DOMAIN_AFFECT_CONFIG; if (virDomainIsActive(dom) == 1) { flags |= VIR_DOMAIN_AFFECT_LIVE; } ret = virDomainDetachDeviceFlags(dom, xml, flags); above code write in thread loop ,then in the same loop : while (1) { mission = vnf_mission_queue_get(task); if (mission == NULL) { sleep(1); continue; } vnf_op_process(&mission->info); // this will deal with network hotplug,will call virConnectDomainEventRegisterAny then call virDomainDetachDeviceFlags if (mission) { vnf_mission_free(mission); } if(virEventRunDefaultImpl() < 0) { // at here process the registered callback for event-registered printf();.... } } My problem is: some time , the virEventRunDefaultImpl can trigger the vnf_control_del_network_cb callback ,but some time there is nothing ,as if the VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED has lost. what cause the Unpredictable behavior ? what is a correct use for virConnectDomainEventRegisterAny ? if can't trigger the vnf_control_del_network_cb callback , the memory :cb_para will mem-leak, so in order to deal the execpt ,i register a timer to process the VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED timeout cb_para->timer_id = virEventAddTimeout(cb_para->time_out, vnf_control_del_network_timeout_cb, cb_para, vnf_control_del_network_cb_free); thought use the timer ,can i avoid the cb_para mem-leak, but fail to achive hotplug network .

2 2

Connections Driver VirtualBox
by claudia freitas 14 Apr '20

14 Apr '20

Good Morning! My name is Cláudia, I'm trying to use the Connections to VirtualBox driver from libvirt.org on Pacemaker to start a virtual machine created with the VirtualBox hypervisor, so far I haven't been successful. Could you send me a practical example of how to use the driver with the VirtualDomain feature in Pacemaker? The examples I found only demonstrate the use with Xen and Qemu. Thanks,

2 1

cloud-init libvirt
by PunkGeek 14 Apr '20

14 Apr '20

is there any way to use cloud-init configs in python libvirt? cloud-init require to create an iso, which seems that ovirt support cloud-config: https://red.ht/2K1gBkn But how can I do that by python libvirt? I know I can mount iso by python libvirt to the VM, but the process of creating iso file is the problem which if it is possible to enter the cloud-config commands by libvirt could be better to me. Regards

3 2

Running libvirtd on windows
by Dhananjay Joshi 14 Apr '20

14 Apr '20

Hi I have downloaded virt-viewer package for windows 10 to run the libvirt framework on windows .When I try to run the virt-viewer facing the issue of not getting the libvirtd URI to connect as below: Any pointers on how to run libvirtd on windows would help... [cid:4d4f58c1-09b4-4ee8-9d66-a9ab91cf1cd2] This message contains information that may be privileged or confidential and is the property of the KPIT Technologies Ltd. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. KPIT Technologies Ltd. does not accept any liability for virus infected mails.

2 1

python equivalent for virDomainGetGuestInfo()
by Joe Muro 09 Apr '20

09 Apr '20

Hi, I am using python apis. I can't seem to find equivalent python function for virDomainGetGuestInfo() https://libvirt.org/html/libvirt-libvirt-domain.html#virDomainGetGuestInfo I have qemu-guest-agent running on the guest, and want to extract os information.

2 1

PolKit rule and API matchaccess_drivers = [ "polkit" ]
by Θεοφάνης Κοντογιάννης 08 Apr '20

08 Apr '20

Hi All, I am trying to implement the following use case. User sfrag is logged on the host via ssh. Running 'virsh list --all' should trigger PolKit authentication and present ALL domains suffixed with -SF I have used and adapted the example from: libvirt.org Git - libvirt.git/blob - examples/polkit/libvirt-acl.rules | | | | | | | | | | | libvirt.org Git - libvirt.git/blob - examples/polkit/libvirt-acl.rules | | | Adapted the setup so that I included user sfrag. Always the user was asked to authenticate via root and not via SELF but ONLY if running "virsh -c qemu:///system list --all" Had to change /etc/libvirt/libvirtd.conf to include: auth_unix_ro = "polkit"access_drivers = [ "polkit" ]log_filters="1:access.accessdriverpolkit"log_outputs="1:file:/var/log/libvirt/libvirtd.log" All polkit rules for user sfrag was removed at this point. Now the user sfrag running 'virsh list --all' gives no output to /var/log/libvirt/libvirtd.log or /var/log/secure. Running the same as user root gives interesting results in the logs: org.libvirt.api.connect.getattrorg.libvirt.api.connect.search-domainsorg.libvirt.api.domain.getattr (fore every defined domain)org.libvirt.api.domain.read (again for every defined domain). Virsh is using qemu:///session as the default URI. Why running virsh as non-root is not triggering polkit or any API calls (based on log files output) and running the same as root, gives all the interesting output? Which implies that running virsh as root results in different actions compaired to calling it as non root. Thank you for Your time. BR Theophanis Kontogiannis

1 0

Getting Intel RDT cache allocation status from libvirt?
by Neil Moore 08 Apr '20

08 Apr '20

Is there a way to get the current cache allocation status of a host from libvirt, via API or virsh? I've seen some references to a 'virsh nodecachestats' command in some patches from 2017 that doesn't seem to exist, and I see that 'virsh domstats --cpu-total <domain>' has similar information but seems to be focused on cache monitoring information rather than the allocation status. Thanks, Neil

1 0

when virEventAddTimeout trigger timeout ,should in the callback call virConnectDomainEventDeregisterAny ?
by thomas.kuang 08 Apr '20

08 Apr '20

hi, all I do a hotplug detach a network in a thread, because virDomainDetachDeviceFlags maybe asynchronous, so I do like follow: cb_para->cluster_id = info->cluster_id; cb_para->group_id = info->group_id; cb_para->vsys_id = info->vsysid; cb_para->vnf_id = info->vnf_id; cb_para->conn = conn; cb_para->time_out = 20*1000;//20s cb_para->call_id = virConnectDomainEventRegisterAny(conn, dom, VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED, VIR_DOMAIN_EVENT_CALLBACK(vnf_control_del_network_cb), cb_para, vnf_control_del_network_cb_free); flags |= VIR_DOMAIN_AFFECT_CONFIG; if (virDomainIsActive(dom) == 1) { flags |= VIR_DOMAIN_AFFECT_LIVE; } cb_para->timer_id = virEventAddTimeout(cb_para->time_out, vnf_control_del_network_timeout_cb, cb_para, vnf_control_del_network_cb_free); ret = virDomainDetachDeviceFlags(dom, xml, flags); //above run in a thread function void vnf_control_del_network_cb(virConnectPtr conn, virDomainPtr dom, const char *dev,void * opaque) { struct vnf_del_netwk_opaque * arg = (struct vnf_del_netwk_opaque *)opaque; if(0 == virConnectDomainEventDeregisterAny(conn, arg->call_id)) { VNF_DBG("succ to deRegister, conn:%p, call id:%d\n", conn, arg->call_id); } else { VNF_DBG("fail to deRegister, conn:%p, call id:%d\n", conn, arg->call_id); } .................... virEventRemoveTimeout(arg->timer_id); } void vnf_control_del_network_timeout_cb(int timer, void *opaque) { struct vnf_del_netwk_opaque * arg = (struct vnf_del_netwk_opaque *)opaque; ................ if(0 == virConnectDomainEventDeregisterAny(arg->conn, arg->call_id)) { //here, dead lock ,are thoses APIs not correct using ?? VNF_DBG("succ to deRegister, conn:%p, call id:%d\n", arg->conn, arg->call_id); } else { VNF_DBG("fail to deRegister, conn:%p, call id:%d\n", arg->conn, arg->call_id); } virEventRemoveTimeout(arg->timer_id); } (gdb) i threads Id Target Id Frame 7 Thread 0x7f29fa5ff700 (LWP 104950) "vnfd" 0x00007f2a064f656d in nanosleep () from /lib64/libc.so.6 6 Thread 0x7f29f9bfe700 (LWP 104951) "vnfd" 0x00007f2a0761851d in __lll_lock_wait () from /lib64/libpthread.so.0 5 Thread 0x7f29f8dff700 (LWP 104952) "vnfd" 0x00007f2a064f656d in nanosleep () from /lib64/libc.so.6 4 Thread 0x7f29f7fff700 (LWP 104953) "vnfd" 0x00007f2a064f656d in nanosleep () from /lib64/libc.so.6 3 Thread 0x7f29f71ff700 (LWP 104954) "vnfd" 0x00007f2a064f656d in nanosleep () from /lib64/libc.so.6 2 Thread 0x7f29f63ff700 (LWP 104955) "vnfd" 0x00007f2a064f656d in nanosleep () from /lib64/libc.so.6 * 1 Thread 0x7f2a087f8900 (LWP 104946) "vnfd" 0x00007f2a06530183 in epoll_wait () from /lib64/libc.so.6 (gdb) thread 6 [Switching to thread 6 (Thread 0x7f29f9bfe700 (LWP 104951))] #0 0x00007f2a0761851d in __lll_lock_wait () from /lib64/libpthread.so.0 (gdb) bt #0 0x00007f2a0761851d in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f2a07613e1b in _L_lock_812 () from /lib64/libpthread.so.0 #2 0x00007f2a07613ce8 in pthread_mutex_lock () from /lib64/libpthread.so.0 #3 0x00007f2a072a1a0e in remoteConnectClose () from /lib64/libvirt.so.0 #4 0x00007f2a072b2740 in virConnectDispose () from /lib64/libvirt.so.0 #5 0x00007f2a0710bbab in virObjectUnref () from /lib64/libvirt.so.0 #6 0x00007f2a07195577 in virObjectEventCallbackFree () from /lib64/libvirt.so.0 #7 0x00007f2a07196532 in virObjectEventStateDeregisterID () from /lib64/libvirt.so.0 #8 0x00007f2a07287238 in remoteConnectDomainEventDeregisterAny () from /lib64/libvirt.so.0 #9 0x00007f2a072d36d7 in virConnectDomainEventDeregisterAny () from /lib64/libvirt.so.0 #10 0x0000000000405bce in vnf_control_del_network_timeout_cb (timer=<optimized out>, opaque=0x7f29e9e99de0) at vnf_mgt/vnf_control.c:1293 #11 0x00007f2a070d20e9 in virEventPollRunOnce () from /lib64/libvirt.so.0 #12 0x00007f2a070d0a42 in virEventRunDefaultImpl () from /lib64/libvirt.so.0 #13 0x000000000040d099 in vnf_worker_proc (arg=<optimized out>) at vnf_mgt/vnf_control.c:1727 #14 0x00007f2a07611e25 in start_thread () from /lib64/libpthread.so.0 #15 0x00007f2a0652fbad in clone () from /lib64/libc.so.6 (gdb) f 10 #10 0x0000000000405bce in vnf_control_del_network_timeout_cb (timer=<optimized out>, opaque=0x7f29e9e99de0) at vnf_mgt/vnf_control.c:1293 1293 if(0 == virConnectDomainEventDeregisterAny(arg->conn, arg->call_id)) { (gdb) p arg->time_id There is no member named time_id. (gdb) set print pretty (gdb) p *arg $1 = { cluster_id = 0, vsys_id = 0, group_id = 2, vnf_id = 1, call_id = 0, timer_id = 16, time_out = 20000, conn = 0x7f29f8013000 } (gdb) quit A debugging session is active.

1 0

Getting Intel RDT cache allocation status from libvirt?
by Neil Moore 07 Apr '20

07 Apr '20

Is there a way to get the current cache allocation status of a host from libvirt, via API or virsh? I've seen some references to a 'virsh nodecachestats' command in some patches from 2017 that doesn't seem to exist, and I see that 'virsh domstats --cpu-total <domain>' has similar information but seems to be focused on cache monitoring information rather than the allocation status. Thanks, Neil

1 0

why virConnectDomainEventRegisterAny can't alway trigger the callback ,how can i get a stable callback ?
by thomas.kuang 07 Apr '20

07 Apr '20

hi, all: I create a vm with six nic, after the vm start, i delete tree nics. all the three nic delete logic will happen in a thread , every nic delete has the following process: int vnf_control_del_network(void *arg) { 。。。。。 call_id = virConnectDomainEventRegisterAny(conn, dom, VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED, VIR_DOMAIN_EVENT_CALLBACK(vnf_control_del_network_cb), cb_para, vnf_control_del_network_cb_free); flags |= VIR_DOMAIN_AFFECT_CONFIG; if (virDomainIsActive(dom) == 1) { flags |= VIR_DOMAIN_AFFECT_LIVE; } ret = virDomainDetachDeviceFlags(dom, xml, flags); // detach a nic from vm guest os 。。。。 } void vnf_control_del_network_cb(virConnectPtr conn, virDomainPtr dom, const char *dev,void * opaque) //this callback can't already trigger to run ，why ? { struct vnf_del_netwk_opaque * arg = (struct vnf_del_netwk_opaque *)opaque; ........ do someing; if(0 == virConnectDomainEventDeregisterAny(conn, arg->call_id)) printf("succ to deRegister, conn:%p, call id:%d\n", conn, arg->call_id); else printf("fail to deRegister, conn:%p, call id:%d\n", conn, arg->call_id) } void* vnf_worker_proc(void *arg) { vnf_mission_t *mission = NULL; pthread_t tid = pthread_self(); vnf_task_ctx_t *task = vnf_task_get_task_info(tid); assert(task); pthread_detach(tid); while (1) { mission = vnf_mission_queue_get(task); if (mission == NULL) { sleep(1); continue; } VNF_IMAGE_DBG("tid:%lu, get one mission from mission queue\n", tid); vnf_op_process(&mission->info); //this cause vnf_control_del_network called if (mission) { vnf_mission_free(mission); } if(virEventRunDefaultImpl() < 0) { VNF_IMAGE_DBG("virEventRunDefaultImpl() called failure\n"); } } return NULL; }

1 0

libvirt remote uri format
by Joe Muro 06 Apr '20

06 Apr '20

Hi, I am using python libvirt api to get domain information. When using a uri without specifying the socket path, an error occurs. uri = "qemu+ssh://myuser@some.kvm.host/system" conn = libvirt.open(uri) This results in the following: libvirt: XML-RPC error : internal error: received hangup event on socket If I append the socket path to the URI, it works. e.g. qemu+ssh://myuser@some.kvm.host/system?socket=/var/run/libvirt/libvirt-sock Is this the recommended way to construct an ssh uri? My concern is that the socket path may be different when connecting to different libvirt hosts. remote host is ubuntu 20.04 running libvirtd (libvirt) 6.0.0 under systemd - Joe

3 5

libvirt Source RPMs for CentOS or RHEL?
by FuLong Wang 06 Apr '20

06 Apr '20

Hello Experts, Do we have libvirt source rpms (version above 5.9.0) for CentOS or RHEL? I only find source rpms for fedora in below public link. https://libvirt.org/sources/ -- FuLong Wang fulong.wang(a)cn.ibm.com IBM China Systems Lab, Beijing, China _______________________________________________

2 2

Question about libvirt filter features
by george_boutwell＠yahoo.com 04 Apr '20

04 Apr '20

1 0

can libvirt.so use jemalloc to manage mem ?
by thomas.kuang 02 Apr '20

02 Apr '20

HI, all My daemon exists a libvirt API call: virEventRegisterDefaultImpl(); once I called the virEventRegisterDefaultImpl() ,must be core ,the bt stack is: (gdb) bt #0 free (ptr=0x1) at include/jemalloc/internal/arena.h:652 #1 0x00007f57690a488a in virFree () from /lib64/libvirt.so.0 #2 0x00007f57690c3562 in virResetError () from /lib64/libvirt.so.0 #3 0x00007f57690c49ad in virEventRegisterDefaultImpl () from /lib64/libvirt.so.0 #4 0x00000000004029ad in main (argc=<optimized out>, argv=<optimized out>) at vnf_mgt/vnf_control.c:2920 (gdb) quit the following code copy from libvirt/src/util / int virEventRegisterDefaultImpl(void) { VIR_DEBUG("registering default event implementation"); virResetLastError(); if (virEventPollInit() < 0) { virDispatchError(NULL); return -1; } virEventRegisterImpl(virEventPollAddHandle, virEventPollUpdateHandle, virEventPollRemoveHandle, virEventPollAddTimeout, virEventPollUpdateTimeout, virEventPollRemoveTimeout); return 0; } void virResetLastError(void) { virErrorPtr err = virLastErrorObject(); if (err) virResetError(err); } static virErrorPtr virLastErrorObject(void) { virErrorPtr err; err = virThreadLocalGet(&virLastErr); if (!err) { if (VIR_ALLOC_QUIET(err) < 0) return NULL; if (virThreadLocalSet(&virLastErr, err) < 0) VIR_FREE(err); } return err; } void virResetError(virErrorPtr err) { if (err == NULL) return; VIR_FREE(err->message); VIR_FREE(err->str1); VIR_FREE(err->str2); VIR_FREE(err->str3); memset(err, 0, sizeof(virError)); } # define VIR_FREE(ptr) virFree(1 ? (void *) &(ptr) : (ptr)) void virFree(void *ptrptr) { int save_errno = errno; free(*(void**)ptrptr); *(void**)ptrptr = NULL; errno = save_errno; } when my daemon link with jemalloc must core，but if i use glibc to manage memory ,then it work fine, why ?

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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 _______________________________________________

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"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 _______________________________________________

2 3

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

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