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[libvirt-users] how xml generated
by 李卓瑶 26 Oct '23

26 Oct '23

hi : i create a domain by virt-manager tool, then there is a xxx.xml generated in /etc/libvirt/qemu/. so, my question is how the xx.xml generated? What the code involves in libvirt ? Thanks! -- Have a good day

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[libvirt-users] How to convert "device_model_version = "qemu-xen-traditiona"" into libvirt xml file How to convert "device_model_version = "qemu-xen-traditiona"" into libvirt xml file
by hanyandong 26 Oct '23

26 Oct '23

I am using Xen-4.4.0, libvirt-1.2.9 My ubuntu.cfg is: ubuntu10.cfg bootloader = "/usr/local/lib/xen/boot/hvmloader" builder="hvm" memory = 512 name = "ubuntu" vif = [ "type=ioemu,bridge=ovsbr0", "type=ioemu,bridge=ovsbr0","type=ioemu,bridge=ovsbr0","type=ioemu,bridge=ovsbr0",,"type=ioemu,bridge=ovsbr0"] device_model_version = "qemu-xen-traditional" If I didnot add " device_model_version = "qemu-xen-traditional" " to ubuntu.cfg, I only can add four NICs to VM. If I add five or more,, I got these errors: libxl: error: libxl_dm.c:1371:device_model_spawn_outcome: domain 12 device model: spawn failed (rc=-3) libxl: error: libxl_create.c:1186:domcreate_devmodel_started: device model did not start: -3 libxl: error: libxl_dm.c:1475:kill_device_model: Device Model already exited If I add " device_model_version = "qemu-xen-traditional" " to ubuntu.cfg, I can apply 8 NICs to VM. But, I want to create domU by virsh(libvirt), so How convert " device_model_version = "qemu-xen-traditional"" to xml file used by virsh? and How many NIC can a VM have? what leads to this limit？ -- Best Regards, yandong

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ANNOUNCE: Forthcoming changes to libvirt mailing list hosting
by Daniel P. Berrangé 13 Oct '23

13 Oct '23

Hello Libvirt Community, For the last 18(!) years, libvirt community mailing lists have been kindly hosted by Red Hat Corporate IT on the redhat.com Mailman installation. In retrospect this wasn't the ideal home for community mailing lists but that decision is ancient history. Unfortunately as a consequence of infrastructure changes, the redhat.com Mailman service is scheduled to be decomissioned, and in the very near future ($low weeks) will cease to be able to send/receive mail for libvirt lists. As a result, all the libvirt mailing lists will need to move to a new Mailman installation, managed on our behalf by the Red Hat Open Source Community Infrastructure team[1], who provide services for a variety of OSS projects. It is intended that this new service will be dedicated for our community and thus located somewhere under the libvirt.org domain. It should go without saying that all existing mail archives will be migrated over to the new server. None of the historical record should be lost. It is not considered appropriate netiquette, however, to bulk-resubscribe all current list members under a new domain. Thus anyone who wants to remain on the community lists will soon be requested to take action to enroll on the new mailman service. The new service is not quite ready for use yet. This mail serves as a heads up that the changes will be coming in the next couple of weeks that will require action. A further announcement will be sent when the new mailman is ready to accept subscriptions, as well as warnings before the old lists stop accepting messages. With regards, Daniel [1] https://www.osci.io/ -- |: 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 :|

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Problem starting Windows 11 EE
by Rahul S 12 Oct '23

12 Oct '23

Hi, I configured a W11EE VM using virt-manager and joined it to my work domain. Everything was fine for a while. Later when I tried to reboot, I got the "Preparing Automatic Repair" message and when I selected "Startup Repair", I got the error "Startup repair couldn't repair your PC". I then went to command prompt, started 'diskpart' and ran "list disk" and got the error "there are no fixed disks to show". I have tried re-installing several times - it always ends up in this state. A few details of my system: host OS: OpenSUSE 15.5 libvirt version: 9.0.0-150500.4.3 virtio drivers: https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive-vi… Disk device type: virtio bitlocker is enabled in VM I am able to configure and use W11-professional without joining my work domain. The above problem isn't seen there. I booted the broken VM using my linux rescue disk image and examined the partition table. Everything seems to be proper. But windows isn't able to find the disk as I explained above. Can anybody provide any pointers for troubleshooting this ? Thanks, -Rahul

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any advantage to using pool type glusterfs if no GFAPI
by W Kern 09 Oct '23

09 Oct '23

I have used fuse mounted gluster with 'dir' for years. Works great, aside from having to use the --unsafe flag on migrations. I am building up a new system and wondering if using the glusterfs type would be a better/safer choice. I'm not concerned about gfapi (host is U22LTS so I'm not even sure if it has it). I'm not concerned about the automount feature as that happens on start up anyway. I'm more interested if there is any technical or performance reasons to prefer 'glusterfs' pool type over 'dir' of course not having the --unsafe flag would be nice, but thats all scripted in anyway. -wk

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Issue accidentally creating a '--type' defined pool
by Joshua Blake 04 Oct '23

04 Oct '23

Hello, I seem to have accidentally created a pool called "--type", but it doesn't appear in 'virsh pool-list'. See below. [root@vh01 /]# virsh pool-define-as --name --type dir --target /data/storage/ Pool --type defined [root@vh01 /]# virsh pool-list Name State Autostart ------------------------------ isos active yes jblake active yes [root@vh01 /]# virsh pool-destroy '--type' error: command 'pool-destroy' doesn't support option --type I can't also create a new "default" type because the directory exists for this defined '--type' [root@vh01 /]# virsh pool-define-as --name default --type dir --target /data/storage/ error: Failed to define pool default error: operation failed: Storage source conflict with pool: '--type' [root@vh01 /]# virsh pool-delete "--type" error: command 'pool-delete' doesn't support option --type Any help would be greatly appreciated.

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Question about encryption and tls
by Kamil Jońca 29 Sep '23

29 Sep '23

(Posted few days ago on qemu group but no reactions) Do I understand correctly that ssl shoudl be configured independently for libvirt and each hypervisor? I asked because I configured libvirt connection as qemu+tls://bambus.kjonca/system?pkipath=... (and on bambus in /etc/libvirt/libvirtd.conf) I set key_file = ... cert_file = ... ca_file = ... But after connect and lauching (on bambus) vm I tried to snif traffic to bambus:5900 on client) and wireshark was able to detect "VNC" protocol (BTW not spice?), so I am confused. should I configure in /etc/libvirt/qemu.conf spice_tls option and certificates ? KJ

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Re: Help ! libvirt
by Bhasker C V 22 Sep '23

22 Sep '23

Adding libvirt mailing list apologies for cross-posting libvirt version: 9.7.0-1 On Thu, Sep 21, 2023 at 8:39 AM john doe <johndoe65534(a)mail.com> wrote: > On 9/21/23 09:32, Bhasker C V wrote: > > I am getting an error with libivrt when I create a VM > > > > ``` > > $ sudo virsh create ./win11.xml > > error: Failed to create domain from ./win11.xml > > error: internal error: mishandled storage format 'none' > > > > ``` > > > > This is after I have done a dist-upgrade (was working fine before) > > debian trixie. > > > > error message says > > qemuBlockStorageSourceGetBlockdevFormatProps:1227 : internal error: > > mishandled storage format 'none' > > > > You might want to post this as well to the Libvirt mailing list. > > -- > John Doe > >

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virtio-mem with virt-install to share memory between guest and host on-demand
by Daniel Krajnik 20 Sep '23

20 Sep '23

Hi I'm trying to Passthrough a GPU to a VM and have it still share its free memory with the host (just like it would with virtio-balloon). Is this something virtio-mem is capable of? I've tried to run it, but it immediately took over 9GB of memory: virt-install --name test --cpu cell0.cpus=0,cell0.memory=4194304,cell1.cpus=1,cell1.memory=4194304 --memory maxMemory=65536,maxMemory.slots=8 --memdev model=virtio-mem,target.node=0,target.block=2048,target.size=1000 --disk size=400 --network network=ai --location=/tmp/debian-12.1.0-amd64-netinst.iso --os-variant=debian11 --graphics none --extra-args "console=ttyS0 Best wishes, Daniel

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CAN virtualization
by Sánta, Márton (ext) 18 Sep '23

18 Sep '23

Dear Users, I use KVM with libvirt 9.0.0. The host and guest OS-es are also AGL needlefish images. I am currently trying to virtualize a CAN driver and provide virtual machines access to the physical CAN channels. I started with the virtual network handling as CAN interface is a network interface, I tried to find analogies, solutions like "traditional" network handling but it did not work. I also tried out to define a nodedev device via .xml config file. The interesting thing is, that when I list all the available nodedev devices with 'virsh nodedev-list', I can see 'net_can0' and 'net_can1' on the output as 'net' type device but I cannot attach these devices to the guests, and I do not know how to define it in the guest .xml file. I tried out many different things, but when I try to add it as a 'hostdev' device with different mode and type settings, I always get an error (e.g. not a PCI device or not supported device type etc.). It would be long to write down all the configurations I tried out, so my first question would be that does anybody know how could I provide access to guests to the physical CAN interfaces? The aim is to be able to send CAN messages from guest OS-es. If no direct access is possible, it would be also OK to have access to virtual CAN interfaces on the host and then transfer messages to the physical CAN channel. Thank you in advance for an early reply! Best regard, Márton Sánta This transmission is intended solely for the addressee and contains confidential information. If you are not the intended recipient, please immediately inform the sender and delete the message and any attachments from your system. Furthermore, please do not copy the message or disclose the contents to anyone unless agreed otherwise. To the extent permitted by law we shall in no way be liable for any damages, whatever their nature, arising out of transmission failures, viruses, external influence, delays and the like.

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