August 2015 - Users - libvirt List Archives

[libvirt-users] CPU feature 'svm' not reported inside guest without 'host-passthrough'
by Sladjan Ristic 30 Aug '15

30 Aug '15

Hi, I am confused by the behaviour of the CPU description in my VM. I have a host with an AMD CPU with SVM feature and I want to try nested virtualization on a Fedora22 guest. The host is Fedora22 as well. libvirtd (libvirt) 1.2.13.1 kernel 4.1.6-200.fc22.x86_64 1. I tried 'custom' mode with model qemu64 with required feature 'SVM' but '/proc/cpuinfo' in the guest doesn't show SVM. 2. However, if I forbid the SVM feature, the guest can't be created and libvirt complains that the host CPU has SVM. 3. The only way to have SVM reported in '/proc/cpuinfo' inside the guest VM is using 'host-passthrough' mode, but I want to avoid it to allow migration of the VM. Is this an issue with AMD This is part of the description of the guest: <domain type='kvm'> <name>vagrant-fedora-libvirt-nested_default</name> <uuid>4a379890-b891-4971-aad6-12fad45eaebc</uuid> <memory unit='KiB'>8388608</memory> <currentMemory unit='KiB'>8388608</currentMemory> <vcpu placement='static'>4</vcpu> <os> <type arch='x86_64' machine='pc-i440fx-2.3'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>qemu64</model> <feature policy='require' name='svm'/> </cpu> Regards, Sladjan

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[libvirt-users] vms not persistent after upgrading to f22?
by Rich Megginson 28 Aug '15

28 Aug '15

With f21 and earlier, I could just call virt-install to create VMs, and they would persist after reboot. After upgrading to f22, when I shut off a VM, it is removed, and has to be recreated. How can I get VMs to persist? Is there a virsh create or virt-install switch to do this?

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[libvirt-users] Isolated networks && test lab
by Spanky Horawitz 28 Aug '15

28 Aug '15

I'm trying to migrate my VirtualBox test lab to KVM. In my VB configuration, I have several VM routers with 4 interfaces each. Each router has a bridged interface which connects them all together and to the outside world. I have servers/clients dispersed on each of the other private (Isolated) segments that use the routers as default gateways. In trying to make this work, I used Virtual Machine Manager to define 3x Virtual Networks (Isolated networks) and created a VM router which has 3 interfaces (192.168.x.1) on each Isolated network and a 4th interface using the br0 interface to get to the outside world. The router is able to connect to the outside world. Using Virtual Machine Manager, I also created "client" VM and connected it's single interface to one of the Isolated networks. While testing connectivity of the "client" VM to the router, it seems to go straight to the Host (tested using 'ssh 192.168.x.1'.) I'm trying to isolate the networks from the Host and have the router receive packets for the 192.168.x.1 address on the individual Isolated network segments. Host: br0 (em1): 192.168.1.16 vibr0 (default): 192.168.122.1 virbr1: 192.168.2.1 virbr2: 192.168.3.1 virbr3: 192.168.4.1 VM router: eth0: 192.168.1.10 eth1: 192.168.2.1 eth2: 192.168.3.1 eth3: 192.168.4.1 VM client: eth0: 192.168.3.101 Is there some trick to isolate the Host from the VM's? Is there a comprehensive guide that explains how the networks should be setup (with/without Virtual Machine Manager)? I'm not afraid to get my hands dirty on the console if needed, but GUI's are easier to navigate when you're learning a new technology. I switched to using RemoteBox for managing my VB vm's as it made things a lot easier to deal with than VBoxManage. Thanks for your help!

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Re: [libvirt-users] Using unix-type channel ....
by Michal Privoznik 28 Aug '15

28 Aug '15

On 28.08.2015 08:34, Jean-Pierre Ribeauville wrote: > HI, > > > > Thx for your hint. > > > > I've tried this instead : > > > > <channel type='unix'> > > <source mode='bind' path='/opt/omnivision_1.agent'/> > > <target type='virtio' name='omnivision_1.agent'/> > > <address type='virtio-serial' controller='0' bus='0' port='2'/> > > </channel> > > > > Then, when starting the Guest I get this error message : [It's better to send just text via e-mail] So, the error message is telling you, that qemu process does not have enough permissions to bind to the unix socket under the given path. Either you should level up qemu permissions (e.g. run it as root), or use path that qemu will have access to. Or set correct permissions on the socket target. Michal

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[libvirt-users] Using unix-type channel ....
by Jean-Pierre Ribeauville 28 Aug '15

28 Aug '15

Hi, I'm trying to use unix-type channel to send/receive datas between host and guest . Here are the steps I follow : 1) Adding these lines to expose a channel unix type to my guest <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/omnivision_1.agent'/> <target type='virtio' name='org.qemu.guest_agent.0'/> <alias name='channel0'/> <address type='virtio-serial' controller='0' bus='0' port='2'/> </channel> 2) the VM_Orion-1 Guest, exposing a channel "unix" omnivision_1.agent is started, then netstat shows these new things : netstat -apn | grep qemu unix 2 [ ACC ] STREAM LISTENING 37214 19124/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor unix 2 [ ACC ] STREAM LISTENING 37219 19124/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 37242 19124/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 37240 19124/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor 3) I start , on the host , a simple test in order to send datas to the guest: ..... sock = socket(AF_UNIX, SOCK_STREAM, 0); if (sock < 0) { perror("opening stream socket"); return(1); } server.sun_family = AF_UNIX; strcpy(server.sun_path, argv[1]); printf("connecting to socket number : %d \n",sock); fflush(stdout); if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { close(sock); perror("connecting stream socket"); return(1); } printf("writing data on stream socket"); if (write(sock, DATA, sizeof(DATA)) < 0) perror("writing on stream socket"); close(sock); ..... 4) invoking > test "/var/lib/libvirt/qemu/omnivision_1.agent" then I got : connecting to socket number : 3 writing data on stream socket and following netstat result : netstat -apn | grep qemu unix 2 [ ACC ] STREAM LISTENING 39348 20587/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor unix 2 [ ACC ] STREAM LISTENING 39353 20587/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 2 [ ] STREAM CONNECTING 0 - /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 39375 20587/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 39373 20587/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor 5) if I try to re-invoke test "/var/lib/libvirt/qemu/omnivision_1.agent" then : netstat -apn | grep qemu tcp 0 0 127.0.0.1:5902 0.0.0.0:* LISTEN 20587/qemu-kvm tcp 0 0 127.0.0.1:5902 127.0.0.1:57772 ESTABLISHED 20587/qemu-kvm unix 2 [ ACC ] STREAM LISTENING 39348 20587/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor unix 2 [ ACC ] STREAM LISTENING 39353 20587/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 2 [ ] STREAM CONNECTING 0 - /var/lib/libvirt/qemu/omnivision_1.agent unix 2 [ ] STREAM CONNECTING 0 - /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 39375 20587/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 39373 20587/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor on the guest side , I try to retrieve datas sent by host , by using this kind of thing : ... int fd = open("/dev/virtio-ports/org.qemu.guest_agent.0", O_RDWR | O_NONBLOCK); ssize_t size = read(fd, &buffer, 100); ... As you can imagine , I never receive any data from the host . Is it the right way to use this "unix-type" channel ? Thx for your patience. Regards, J.P. Ribeauville P: +33.(0).1.47.17.27.87 Puteaux 3 Etage 5 Bureau 4 jpribeauville(a)axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.

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[libvirt-users] Virtio serial exposition
by Jean-Pierre Ribeauville 27 Aug '15

27 Aug '15

Hi, I try to exchange datas between host and Guest by adding these lines in a guest .xml conf file : <channel type='pty'> <target type='virtio' name='arbitrary.virtio.serial.port.name'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> Then /dev/virtio-ports/arbitrary.virtio.serial.port.name is exposed in the guest and a /dev/pts/x is seen as source path on the host. I checked that on two Linux hosts : 1) libvirt-daemon-driver-qemu-1.2.8-16.el7_1.3.x86_64 qemu-kvm-1.5.3-86.el7_1.5.x86_64 qemu-kvm-common-1.5.3-86.el7_1.5.x86_64 qemu-guest-agent-2.1.0-4.el7.x86_64 ipxe-roms-qemu-20130517-6.gitc4bce43.el7.noarch qemu-img-1.5.3-86.el7_1.5.x86_64 Linux sparring 3.10.0-229.el7.x86_64 #1 SMP Thu Jan 29 18:37:38 EST 2015 x86_64 x86_64 x86_64 GNU/Linux 2) qemu-img-0.12.1.2-2.415.el6.x86_64 qemu-kvm-0.12.1.2-2.415.el6.x86_64 gpxe-roms-qemu-0.9.7-6.10.el6.noarch Linux orion 2.6.32-431.el6.x86_64 #1 SMP Sun Nov 10 22:19:54 EST 2013 x86_64 x86_64 x86_64 GNU/Linux The device is only exposed on the guest of the first host . Is it due to a too old version of qemu and/or Linux on the second host or some packages missing on this second host ? Thx. Regards, J.P. Ribeauville P: +33.(0).1.47.17.27.87 Puteaux 3 Etage 5 Bureau 4 jpribeauville(a)axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.

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Re: [libvirt-users] On which /dev/pts/x is channel source
by Jean-Pierre Ribeauville 26 Aug '15

26 Aug '15

Hi, I just tested by using "unix virtio" channel instead of pty. It looks easier to handle. Thx for help. Regards, J.P. -----Message d'origine----- De : libvirt-users-bounces(a)redhat.com [mailto:libvirt-users-bounces@redhat.com] De la part de libvirt-users-request(a)redhat.com Envoyé : mercredi 26 août 2015 15:38 À : libvirt-users(a)redhat.com Objet : libvirt-users Digest, Vol 68, Issue 26 Send libvirt-users mailing list submissions to libvirt-users(a)redhat.com To subscribe or unsubscribe via the World Wide Web, visit https://www.redhat.com/mailman/listinfo/libvirt-users or, via email, send a message with subject or body 'help' to libvirt-users-request(a)redhat.com You can reach the person managing the list at libvirt-users-owner(a)redhat.com When replying, please edit your Subject line so it is more specific than "Re: Contents of libvirt-users digest..." Today's Topics: 1. Isolated networks && test lab (Spanky Horawitz) 2. Re: On which /dev/pts/x is channel source mapped ? (Pierre Schweitzer) 3. Virtio serial exposition (Jean-Pierre Ribeauville) 4. Re: On which /dev/pts/x is channel source mapped ? (Daniel P. Berrange) ---------------------------------------------------------------------- Message: 1 Date: Tue, 25 Aug 2015 17:17:56 -0700 From: Spanky Horawitz <shorawitz(a)gmail.com> To: libvirt-users(a)redhat.com Subject: [libvirt-users] Isolated networks && test lab Message-ID: <1440548276.17239.68.camel@psdchristensen> Content-Type: text/plain; charset="utf-8" I'm trying to migrate my VirtualBox test lab to KVM. In my VB configuration, I have several VM routers with 4 interfaces each. Each router has a bridged interface which connects them all together and to the outside world. I have servers/clients dispersed on each of the other private (Isolated) segments that use the routers as default gateways. In trying to make this work, I used Virtual Machine Manager to define 3x Virtual Networks (Isolated networks) and created a VM router which has 3 interfaces (192.168.x.1) on each Isolated network and a 4th interface using the br0 interface to get to the outside world. The router is able to connect to the outside world. Using Virtual Machine Manager, I also created "client" VM and connected it's single interface to one of the Isolated networks. While testing connectivity of the "client" VM to the router, it seems to go straight to the Host (tested using 'ssh 192.168.x.1'.) I'm trying to isolate the networks from the Host and have the router receive packets for the 192.168.x.1 address on the individual Isolated network segments. Host: br0 (em1): 192.168.1.16 vibr0 (default): 192.168.122.1 virbr1: 192.168.2.1 virbr2: 192.168.3.1 virbr3: 192.168.4.1 VM router: eth0: 192.168.1.10 eth1: 192.168.2.1 eth2: 192.168.3.1 eth3: 192.168.4.1 VM client: eth0: 192.168.3.101 Is there some trick to isolate the Host from the VM's? Is there a comprehensive guide that explains how the networks should be setup (with/without Virtual Machine Manager)? I'm not afraid to get my hands dirty on the console if needed, but GUI's are easier to navigate when you're learning a new technology. I switched to using RemoteBox for managing my VB vm's as it made things a lot easier to deal with than VBoxManage. Thanks for your help!

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[libvirt-users] On which /dev/pts/x is channel source mapped ?
by Jean-Pierre Ribeauville 26 Aug '15

26 Aug '15

Hi, By adding following lines in a Guest .xml conf file , I'm able to send / receive datas between host and this guest. <channel type='pty'> <target type='virtio' name='arbitrary.virtio.serial.port.name'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> My question is the following : How may I find to which /dev/pts/x is mapped the source path ( from the host point of view) ? I was able to find it by having a look in the virt manager GUI , but I want to do it programmatically. I've tried to force it by specifying a source path in the .xml file .... No way Thx for help. Regards, J.P. Ribeauville P: +33.(0).1.47.17.27.87 Puteaux 3 Etage 5 Bureau 4 jpribeauville(a)axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.

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[libvirt-users] Check whether we are runnig on a KVM guest
by Jean-Pierre Ribeauville 25 Aug '15

25 Aug '15

Hi, How may I , via a C program , check whether I'm running on a KVM guest ? May I use the same API on Windows and Linux Guest ? Regards, J.P. Ribeauville P: +33.(0).1.47.17.27.87 Puteaux 3 Etage 5 Bureau 4 jpribeauville(a)axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.

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[libvirt-users] from command line to xml file
by Jean-Pierre Ribeauville 25 Aug '15

25 Aug '15

Hi, In order to use a virtio-serial to exchange data between host and its guests, I'd like to modify the .xml Guest conf file by adding these parameters ( as found in the command line) : -device virtio-serial \ -chardev socket,path=/tmp/foo,server,nowait,id=foo \ -device virtserialport,chardev=foo,name=org.fedoraproject.port.0 How should I build the XML tags ? Thx for help. J.P. Ribeauville P: +33.(0).1.47.17.27.87 Puteaux 3 Etage 5 Bureau 4 jpribeauville(a)axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.

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