Questions tagged [xen]

XEN is a hypervisor based virtualization technique.

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Debian installation from USB: "the logical volume vm-sys-net-private on qubes_dom0 could not be deleted"

I tried Qubes OS and found out that it is too heavy and complicated for me. So I tried to install Debian from a flashed USB. However, the installer gives the following error: the logical volume vm-sys-...
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How does Xen validate exception handlers installed by Guest OSes?

I don't understand a part of the paper Xen and the art of Virtualization. On the topic of virtualizing exception handling (section 2.1.2), the paper states that each guest OS can register a table that ...
Matteo's user avatar
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tmux scrolling itself is fast, but after some weeks of running the tmux session, the start is slow

when i start scrolling back in tmux with CTRL+b+PgUp it first starts directly, but over time it starts really slow - some minutes untill the backscroll starts. When it is started, everything is ...
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Is it possible to keep unmanaged Windows partition when installing xcp-ng to a physical drive containing it?

I have read the following at XCP-ng web site: XCP-ng is a specialized Linux distribution, so you need to dedicate a physical disk to it. Partitioning is done automatically. https://docs.xcp-ng.org/...
Alexander Ites's user avatar
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Mount LVM backup partition inside host on XEN

I have a XEN server (4.17) with a volume group vg0 and some volumes on it where one is a logical volume especially for Nextcloud e.g.: lvcreate -n nextcloud -L2000G vg0 mkfs.ext4 /dev/vg0/nextcloud ...
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Internal Error: libxenlight failed to create new domain "FreeBSD-13.2"

I tried to use xen as a hypervisor instead of kvm + libvirt + virt-manager to boot FreeBSD on my ARM Chromebook where I have installed Devuan 5,since Stefano said : Libvirt + virt-manager with the xen ...
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Should we boot the FreeBSD kernel in ELF format or in zImage format ? How?

we have just virtualized Debian 12 on our arm (32 bit) Chromebook. As host / dom0 we have chosen Devuan 5,and for guest / domU,Debian 12. It works great. But our goal is different. We want to ...
Marietto's user avatar
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libxl: error: libxl_create.c:720:libxl__domain_make: domain creation fail: Permission denied

I'm trying to boot Linux 6.1.y as Xen dom0 on the Chromebook xe303c12, aka Snow and configure and start a very basic domU guest,following the Chuck's tutorial,located here : https://github.com/mobile-...
Marietto's user avatar
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FATAL: do_vbutil_kernel: Missing required config file

I'm trying to compile Xen on my ARM Chromebook following this tutorial : https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/Chromebook I've reached almost on the end of tutorial ...
Marietto's user avatar
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exynos-mixer 14450000.mixer: [drm:exynos_drm_register_dma] *ERROR* Device 14450000.mixer lacks support for IOMMU

We are trying to boot Xen on a Samsung XE303C12 Chromebook aka "snow" following the suggestions in the slide show presentation here: https://www.slideshare.net/xen_com_mgr/xpds16-porting-xen-...
Marietto's user avatar
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How to format NVMe drive in Linux suitable for raid 1 and lvm on xen Host

I want to create a software raid on two identical SSDs How do I create partitions and format them optimal? lsblk nvme0n1 259:0 0 953.9G 0 disk nvme1n1 259:1 0 953.9G 0 ...
rubo77's user avatar
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dtb phandle Failed to add to the IOMMU

I have this error : (XEN) *** LOADING DOMAIN 0 *** (XEN) Loading d0 kernel from boot module @ 0000000018000000 (XEN) Allocating 1:1 mappings totalling 1024MB for dom0: (XEN) BANK[0] 0x00000020000000-...
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Xen: some logical volumes are missing after dist-upgrade vrom Debian 10 to 12 and after reboot

I updated my Debian Xen Server from 10 to 11 and then without reboot to Debian 12, then I rebooted the server and now only some VMs started. vm06 is running fine while vm04 is not (and some more, but ...
rubo77's user avatar
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Install base Linux on KVM virtualized hardware (dom0)

Goal: I would like to install my main Linux distro on top of KVM, equivalent to dom0 in Xen hypervisor parlance. I know that running an OS on top of a hypervisor is not uncommon and that KVM has been ...
Adam Erickson's user avatar
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enhance performance in XEN VMs when copying lots of files inside the host

When I copy large amounts of data back and forth on my Debian XEN server in the host-VM, the server response in the webserver-VM with nginx becomes very slow. This is how I cause the problem in the ...
rubo77's user avatar
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How does XEN work without VHE on ARM?

XEN has support for ARM and it is also possible to run it on a cpu without VHE (virtual hardware extension) cap that was introduced with ARMV8.1-A extension. As I understand linux kernel of a guest vm ...
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Debian does not boot with Xen

I set up some new Hardware to run a debian xen host on. Installing Debian worked fine, but when i installed xen-system-amd64 and tried to boot with xen hypervisor the screen stays black after the grub ...
ukLab's user avatar
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Xen DomO Has Network But DomU Does Not

My server lost power last night so was abruptly shut down. Bringing it back up this morning my xen dom0 can connect to network, but my domU cannot. Tried full reboots of Dom0 and DomU. Only DomU on ...
curios's user avatar
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Installing openSUSE 15.4 as a PV Xen Guest (DomU) on Debian 11 - cannot find kernel to link in xen-tools configuration

we are currently trying to set up a virtualized environment in which we would like to use openSUSE 15.4 Leap as a Xen Guest (DomU) on a Debian 11 Host. To do so I have found some resources which ...
SinjinVanCleefe's user avatar
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No keyboard in Xorg in Xen domU

I am using XEN 4.14.5 for Debian Bullseye in dom0, and my domU is Devuan Chimaera (a fork of Debian Bullseye). I connect to the VNC server for the domU, and everything works before starting X11. (...
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Boot into Xen on debian11 (initrd trouble)

Linux xd 5.10.0-16-amd64 #1 SMP Debian 5.10.127-1 (2022-06-30) x86_64 GNU/Linux Edit 2022-07-20 This issue has had comes and goes, at the moment, I am having a lot of trouble when Xen boot lands on ...
Bruno Schroeder's user avatar
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Booting into Xen with grub2-mkconfig 2.03 on centos8 x86_64

Linux localhost.localdomain 4.18.0-394.el8.x86_64 #1 SMP Tue May 31 16:19:11 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux grub2-mkconfig (GRUB) 2.03 On my centos8, I have installed centos-release-...
Bruno Schroeder's user avatar
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deleting data in a domU-mounted image does not reduce the image size

I have difficulties understanding the following situation: Dom0 image: [root@Dom0]# du -h 19.12.0.0_dbhome_1.img 980M 19.12.0.0_dbhome_1.img is mounted on DomU: [root@DomU]# df -h /u01/app/oracle/...
Jan's user avatar
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How to remove a logical volume from xen vm after failed snapshot

First of I'm fairly new to xen vm technology so sorry in advance if I use the wrong vocabulary. So what happened is I took a snapshot from my vm, after a while a cronjob tried to create a second ...
bluefish's user avatar
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Xen: is possible to see processes of the domU on dom0?

I have installed on a Debian dom0 a paravirtualized domU(Opensuse) When I use lxc I can see the process with the "translated" uid for example, on a Slackware lxc "host" I can see ...
elbarna's user avatar
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What is the maximum amount of memory that can be allocated to a 32-bit Cent OS 6.5 Xen server virtual machine?

When I creating a 32-bit virtual machine with Cent OS 6.5 on Xen server 7.6, the following error is reported when the memory setting of the virtual machine exceeds 16G: the amount of physical memory ...
Andrew's user avatar
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Find what is causing high CPU usage on Qubes OS

In Qubes OS, processes are running in multiple VMs, so just running top on a VM won't necessarily tell me anything useful, if that VM isn't using the CPU very much. How can I find out which process(es)...
Robin Green's user avatar
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Where are libvirt's VM definitions "originals" stored, and how to sync them across multiple nodes?

Migrating from Xen's xm to Xen's xl under control of libvirt, I wonder: Where does libvirt store the "originals" of VM configurations? I found that my PVM configurations are stored in /etc/...
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Resizing a LVM partition

I'm running XCP-ng and I want to mount a partition in which I can store ISOs. I want it to be 30Gb out of the 2Tb storage that I have. Can someone help me with this? I've tried gparted but it doesn't ...
ARandomMuslim's user avatar
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How can I set the current value of vCPUs lower with Citrix XenServer 8.2?

I've setup my VM as so: Note: It's initial number of vCPU is 2 Later, I increase it but notice that there's no way to decrease it: Question: Is there any way to change the current number of vCPUs ...
Suhail Doshi's user avatar
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Xencenter server with failed disk mirror - LVM - I am unsure how to proceed

I'm having a serious problem with an older server I inherited running Xencenter. The VM would no longer boot with a VDI unavailable error.. I began troubleshooting as much as I could but I have very ...
Dennis's user avatar
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Debian Buster, Xen and Docker - Network bridge issue?

I have a small home server running Debian. On this server I have a few VMs running and I recently installed Docker. I was actually planning to remove some of the VMs and use containers instead. The ...
Jean-François's user avatar
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3k views

When making a VM, why would I want to not pass it all my cpu cores?

(I'm using xcp-ng/xen as my hypervisor but general question as I also wonder this about qemu/kvm and virtualbox when I use them) whenever I make a VM, I have an option to give it as many cores as I ...
user863492's user avatar
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Blacklisting nouveau driver and bochs_drm don't work at all in the xen / ubuntu 20.10 guest os

I'm trying to passthrough my nvidia GTX 1060 from ubuntu 20.10 host to xen with ubuntu 20.10 guest os. Below you can see how is configured everything (default vga display adapter / nvidia 1060 driver ...
Marietto's user avatar
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XEN: Cannot Install Centos 8 as PV-based DOMU with Debian 10 DOM0

My goal is to install CentOS 8 as a Guest/DOMU on a Xen system managed/installed via Debian 10. I need to use PV since the hardware doesn't support HVM as it is quite old. HVM would obviously simplify ...
unchainched's user avatar
1 vote
2 answers
549 views

xen and the support for spice GL

To make a long story short,I tried to pass through my two kinect 2 devices from ubuntu 20.04 to a two qemu / kvm virtual machines,where on the first one I have also passed through my RTX 2080 ti and ...
Marietto's user avatar
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How do I send emails via msmtp from inside XEN DOM0

I have a XEN server with someVMs, one of them is the email server. How do I tell DOM0 to send all root emails to my administration email, which is inside the email-VM? I tried install msmtpd and added ...
rubo77's user avatar
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Not all XEN VMs auto start after reboot of DOM 0

On my Xen host (systemd in Debian Buster, Xen 4.11), I usually start all guest VMs automatically. I added all my VM configs as link in /etc/xen/auto/ to the underlying config like /etc/xen/auto/proxy....
rubo77's user avatar
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Cannot boot new VM, when copied from one XEN-host to another

n my Debian 10 (buster) XEN Host, I copied a Xen-VM that is using Debian jessie from an LVM-snapshot into a new xen guest and tried to start it. This is what I did: Copy xen VM to test a dist-upgrade ...
rubo77's user avatar
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Copy xen VM to test a dist-upgrade of a mailserver

I use Xen with LVM and want to clone my mailserver VM vm01.mail-disk with courier/postfix in Debian jessie to test if an upgrade is easily feasable. How do I clone the VM and what do I have to change ...
rubo77's user avatar
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Relationship between AWS EC2 VPC and Xen Networking

Does characteristics of networking configuration on AWS VPC (public IP, private IP, subnets, route and gateway) are derived of Xen networking model?
user410530's user avatar
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Xen pvgrub with lz4 compressed kernels

I am running PV guests on xen 4.11 with pvgrub. The recent releases of ubuntu (>19.04) look to have switched to lz4 compressed kernels. These kernels work fine with direct boot, but under pvgrub and ...
John S's user avatar
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Copy VM from Xen hypervisor

I have copied (using dd command) a whole disk of Debian7 VM running on Xen server. I was able to convert the raw image to the kvm format (qemu-img). Than I've created new VM and attached disk image (...
just_a_noob's user avatar
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XenServer 6.5 Trying to launch VMs from Local SR

Let me being by saying I am new to Xen Server, I’m come for the telecom/networking world, but now I find myself managing servers. With that being said I am looking for assistance with setting up a ...
henron626's user avatar
1 vote
1 answer
281 views

clone complete XEN LVM server including all VMs

I ordered a faster Hetzner root server to move my XEN mashine there with all volume groups, lvm-volumes and VMs. I already started to create the same xen VMs there, copy config files and userdata and ...
rubo77's user avatar
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Xen Server: Free memory != dmidecode -t17 output

Overview I'm running a Xen server on Debian buster. Latest kernel, latest BIOS version, legacy boot. Booting into Xen server only shows 8 GB of RAM free while recognizing 16 GB of RAM connected. ...
HBSKan's user avatar
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Unable to complete install: 'unsupported configuration: emulator '/usr/lib/xen-4.11/bin/qemu-system-i386' not found'

Log: Unable to complete install: 'unsupported configuration: emulator '/usr/lib/xen-4.11/bin/qemu-system-i386' not found' Traceback (most recent call last): File "/usr/share/virt-manager/...
Kitty Cat's user avatar
1 vote
2 answers
2k views

resize a xen virtual disk

I have a VM running on my XEN host which goes low on diskspace. It has mounted its volume as /dev/xvda2 formatted with a ext4 filesystem. This is my xen config for the VM: # /etc/xen/vm04....
rubo77's user avatar
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How to debug laptop S3 suspend problems on Xen/Fedora?

I'm running Qubes, which is basically Xen with a Fedora 25 as dom0. The only thing that does not work properly is when I close the notebook lid or press suspend. When I open the notebook again nothing ...
PPP's user avatar
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3 votes
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Create Xen guest with preinstalled packages and settings

For context, I'm creating a script to simplify the process of creating xen guests. The script uses xen-create-image and uses a bunch of flags to set as many useful settings as possible (distro, vg, ...
Angus's user avatar
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