May 2021 - Users - libvirt List Archives

[libvirt-users] [virtual interface] detach interface during boot succeed with no changes
by Yalan Zhang 08 Sep '22

08 Sep '22

Hi guys, when I detach an interface from vm during boot (vm boot not finished), it always fail. I'm not sure if there is an existing bug. I have confirmed with someone that for disk, there is similar behavior, if this is also acceptable? # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 2; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </controller> <interface type='network'> <mac address='52:54:00:98:c4:a0'/> <source network='default' bridge='virbr0'/> <target dev='vnet0'/> <model type='rtl8139'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> When I detach after the vm boot, expand the sleep time to 10, it will succeed. # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 10; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully ------- Best Regards, Yalan Zhang IRC: yalzhang Internal phone: 8389413

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Need more doc for libvirt-console-proxy
by Guy Godfroy 05 Oct '21

05 Oct '21

Hello, I'm making a web app for my company that will enable different teams to manage their own VMs. I wish to make possible to interact with each VM console, so I plan to use some xterm.js with websockets. So I discovered libvirt-console-proxy [1] when I looked for something to put a libvirt console into a websocket. That seems like the right tool for the job. The only doc I found is this article from 2017 [2]. After trying to understand from this article and from --help, I still have many questions. I am really bad at reading code so I can't even get answers from the sources. My main concern is: How a client is supposed to talk to the proxy? It is said that a security token must be provided. How? HTTP header? Which header? Am I missing something in websocket protocol? I think an example client implementation would help a lot. Also, I tried to use virtconsoleresolveradm to set up metadata on my domains like explained in the article [1] : ./virtconsoleresolveradm enable milou Enabled access to domain 'milou' But that doesn't seem to do anything (except defining the metadata namespace in the XML): virsh metadata milou http://libvirt.org/schemas/console-proxy/1.0 <consoles/> I precise that I have already this in my XML: <serial type='pty'> <target type='isa-serial' port='0'> <model name='isa-serial'/> </target> </serial> <console type='pty'> <target type='serial' port='0'/> </console> Should I remove that? Should I edit that? Thanks for your help. Guy Godfroy [1] https://gitlab.com/libvirt/libvirt-console-proxy [2] https://www.berrange.com/posts/2017/01/26/announce-new-libvirt-console-prox…

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virtiofs mounted filesystems & SELinux
by Link Dupont 07 Jun '21

07 Jun '21

I am mounting a filesystem into a domain using the virtiofs driver. <filesystem accessmode="passthrough" type="mount"> <source dir="/home"/> <target dir="/home"/> <driver type="virtiofs"/> </filesystem> Both my host (Fedora 34) and guest (CentOS 8.4) are running with SELinux enforcing. From my host, I can see that the SELinux context type is set to user_home_dir_t. $ ls -ldZ /home/link drwxr-xr-x. 61 link link system_u:object_r:user_home_dir_t:s0 8192 May 21 12:41 /home/link >From within the guest however, the volume is unlabeled_t $ ls -lZd /home/link drwxr-xr-x. 61 link link system_u:object_r:unlabeled_t:s0 8192 May 21 12:53 / home/link Is there a way to pass the SELinux context through to the guest? Or mount the volume with the correct options to map SELinux contexts?

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Re: How to hot plugin a new vhost-user-blk-pci device to running VM?
by 梁朝军 05 Jun '21

05 Jun '21

Thanks all of you for your help. One more question regarding vhost-user-blk-pci type device, how to identify a vhost-blk disk in QEUM VM ? for example, disk name looks like vda,vdb,..., but that some application in VM want to detect that a certain entry is really the device it is waiting for. Specific for windows , they always show as disk 0, 1, 2….etc Is there any way to identify those disk with each other in VM? thanks > 在 2021年5月17日，下午3:13，Michal Prívozník <mprivozn(a)redhat.com> 写道： > > On 5/17/21 7:08 AM, Liang Chaojun wrote: >> >> Thanks Michal and Peter for your response. I‘ m running it on qemu 5.1 build by myself. BTW, follow Peter’s suggestion, where I can get the latest rpms if I want to upgrade to Libvirt 7.1? As I know it seems need more than twenty related rpms not include dependency. > > Well, since you're building qemu yourself you could also build libvirt. > Just be aware that the v7.3.0 release was the last one that supports > RHEL-7. Newer releases might still work, but upstream does not aim to > make everything work. > > https://libvirt.org/platforms.html > > Michal >

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how to increase vram in windows guest?
by gansteed 27 May '21

27 May '21

Hello: I'm using kvm to host a windows 7 guest vm, I've install the latest spice guest tools from https://spice-space.org/download/windows/spice-guest-tools/spice-guest-tool…, and I've set video section like this: <video> <model type="qxl" ram="262144" vram="262144" vram64="262144" vgamem="131072" heads="1" primary="yes"/> <alias name="video0"/> <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x0"/> </video> but the graphics in windows guest is laggy, I' found that the guest have only use 16MB as vram: How can I increase the real usage of vram in the windows guest vm?

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Console of P2V?
by Ken D'Ambrosio 24 May '21

24 May '21

Hey, all. For one, apologies if this isn't quite the right list, I tried to get the right one. But, my problem: I'm firing up a Centos 6.5 box with virt-install, recently converted from a physical (I did a 'dd' to a raw image, and converted it to qcow2), and it boots fine, etc., etc., but I can't get to the console except through vnc; "virsh console" just shows a blank screen. Do I need to tell the kernel to boot in ASCII mode or somesuch? Thanks! -Ken

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virHostdevIsPCINodeDeviceUsed
by Simon Fairweather 19 May '21

19 May '21

I am looking to be able to check if a specific PCI device is allocated to a guest. An error is produced if a domain is started and the device is in use within another domain via this function. I cannot see a publicly available function to use to get this information, is there one available or is there another way to check the state of the PCI device. Regards Simon

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How to hot plugin a new vhost-user-blk-pci device to running VM?
by 梁朝军 14 May '21

14 May '21

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How to hot plugin a new vhost-user-blk-pci device to running VM?
by Liang Chaojun 13 May '21

13 May '21

Hi Guy, Does anyone clear how to hot plugin a new vhost-user-blk-pci device to a running VM? Before staring vm , I pass the disk through QEMU command line like below. <qemu:commandline> <qemu:arg value='-object'/> <qemu:arg value='memory-backend-file,id=mem0,size=4G,mem-path=/dev/hugepages,share=on'/> <qemu:arg value='-numa'/> <qemu:arg value='node,memdev=mem0'/> <qemu:arg value='-chardev'/> <qemu:arg value='socket,id=spdk_vhost_blk721ea46a-b306-11eb-a280-525400a98761,path=/var/tmp/vhost.721ea46a-b306-11eb-a280-525400a98761,reconnect=1'/> <qemu:arg value='-device'/> <qemu:arg value='vhost-user-blk-pci,chardev=spdk_vhost_blk721ea46a-b306-11eb-a280-525400a98761,bootindex=1,num-queues=4'/> <qemu:arg value='-chardev'/> <qemu:arg value='socket,id=spdk_vhost_blk2f699c58-d222-4629-9fdc-400c3aadc55e,path=/var/tmp/vhost.2f699c58-d222-4629-9fdc-400c3aadc55e,reconnect=1'/> <qemu:arg value='-device'/> <qemu:arg value='vhost-user-blk-pci,chardev=spdk_vhost_blk2f699c58-d222-4629-9fdc-400c3aadc55e,num-queues=4'/> </qemu:commandline> But I don’t know how to live add a vhost-user-blk-pci device on running VM even with calling attachDevice API now. OS: redhat 7.4 Libvirt version: 3.4 Your help will be appreciated. Thanks!

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boot arm64 guest stuck
by Jiatong Shen 11 May '21

11 May '21

hello community, I am stuck at a problem where a virtual machine stuck at "guest has not initialized the display" on a arm64 (FT2000+) server and the relevant qemu process will continue to have a cpu usage of 100%. I do try with different qemu and qemu-efi combined and found out that if I use qemu build qemu-system-arm/now 1:2.11+dfsg-1ubuntu7.15~cloud1 arm64 with qemu-efi/now 0~20160408.ffea0a2c-2 all and set gic-version to 2, the vm could boot. the virtual machine uses a kylink 4.0 image. I am scrubbing my head to debug the bug and find out the reason... any idea or advice will be appreciated. thank you very much for the help -- Best Regards, Jiatong Shen

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