Questions tagged [kvm]

Questions about the Kernel-based Virtual Machine, an open source virtualization infrastructure to use the Linux kernel as a hypervisor.

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/dev/kvm error in Android studio

When I tried to emulate a Google Pixel 4a but it said: /dev/kvm access denied. I tried sudo apt-get install qemu-kvm but it didn't work, I hope I find a response
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Troubleshooting KVM's guest anaconda installer logs

I am trying to install RHEL7.9 KVM guest on Ubuntu 18.04 Azure VM. The anaconda installer fails due to some error but the virt-viewer screen got closed so fast, I was unable to read what is the exact ...
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Single GPU passthrough

hey I have some problems with setting up Single GPU Pass through and need some help these are all the codes/ logs I'm getting.. What happens is when I click run on the kvm it goes black screen and ...
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KVM guest abruptly shutdown

I have created various guest KVM virtual machines (host is Ubuntu 20.10, guests are OEL 7.9, but have had the same behavior with Ubuntu or RedHat guests), and they abruptly shut down without warning ...
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KVM guest bridged network not working on ubuntu 20.04

I am trying to setup a guest VM (Centos 6.3) on a ubutnu server 20.04 host. The host is a server connected via a lacp bond. On top of the lacp bond I am running a public bridge to which my VM's can ...
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GNOME Boxes: How to expose battery to guest OS?

I'm running a couple VMs via GNOME Boxes (libvirt qemu/kvm) on a Dell XPS 13. Unfortunately, these guest operating systems don't seem to understand they are running on notebook hardware, and hence do ...
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Why screen saver not working for my win10 VM guest?

I have a Windows 10 VM guest running under kv/qemu on 20.04. Some of the interesting details: I'm passing through GPU, sound device and a Fresco USB PCI card. It's running off a SSD block device. ...
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Ubuntu 21.04 under kvm - Wayland

Is it normal that I had to disable Wayland when running Ubuntu 21.04 as a virtual machine under kvm? I'm running on an AMD processor with NVidia driver in the host OS, which is Ubuntu 20.04 LTS. I ...
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Qemu/KVM Postcopy migration fails in hirsute / v5.11 kernels (solved)

postcopy migration isn't the default but can in some cases be very useful With Ubuntu 21.04 Hirsute kernel being v5.11 postcopy migration will fail like: virsh migrate --unsafe --live --postcopy --...
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Is the allocated number of CPUs freed to the host machine when I pause the virtual machine?

In KVM virt-manager, is the allocated number of CPUs released from the VM to the host machine if I pause the virtual machine? If the allocated CPUs are released when I pause the virtual machine, I ...
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37 views

What is CPU topology in kvm virt-manager?

In KVM virt-manager what is the meaning of Sockets, Cores, and Threads ?
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How to add subdomains by defining new zones in a local DNS server

I have a local server which I am managing multiple VMs with Qemu-KVM under ubuntu 18.04. Local server has already a static IP and a domain name given from our company IT, say the domain name main....
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171 views

Bridged networking in KVM/Qemu LAN addressed packets dropped

Summary: In a bridged KVM/QEMU configuration, network packets destined to guest VM do not get there. Configuration: The host is an up to date Ubuntu 20.04.2 LTS server; The guest is any of 3 VMs, a ...
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Multi GPU with GPU Passthrough Setup

I am having trouble setting up multi GPU, with the goal of having GPU passthrough to a KVM Windows 10 install. I have a relatively old MB, but it appears to support IOMMU. I have purchased a very ...
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57 views

qemu-kvm 5.2 On Ubuntu 20.04

I am using ubuntu 20.04 for openstack compute nodes. I see the version qemu-kvm version 4.2 on ubuntu repos. How can I install latest qemu-kvm version 5.2 on ubuntu 20.04. Will there be any ...
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How to auto grab/release mouse pointer in QEMU/KVM?

I tried VMs in virt-manager (or vfio, I don't know the difference), and I found the auto grab and release function a total bargain. Now I switched to QEMU and I don't have this function (at least not ...
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How can I host VMs on my Ubuntu Server for remote access within my LAN?

I've read a bunch about KVM, installed it and then successfully create a VM inside it using this guide. Now I would like to be able to access it from my other computers (Windows and Ubuntu) within my ...
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1answer
60 views

hotplug usb drive to a VM

As per this article: https://www.linux-kvm.org/page/USB I can create a disk image and attach it as a USB drive to my running VM. I tried this, via qemu-monitor-command option of virsh, but somehow ...
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Why would KVM intermittently cause 100% CPU load by “System interrupts” in a Windows 10 VM?

I'm running a hundred Ubuntu 16.04 LTS servers with basically identical hardware distributed worldwide. (I'm working on upgrading them to 20.04 LTS but certain unfortunate design decisions on the part ...
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Why does my Windows 10 installed in a KVM virtual machine, need an installation iso?

I installed Windows 10 inside a KVM Virtual Machine by downloading the Win 2020 iso image from the Microsoft site. The virtual machine worked fine till I moved the Windows iso. Why? What did I do ...
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Ubuntu 20.04 upgrade - KVM - Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

I recently updated to Ubuntu 20.04 and on my NC server and this error has started appearing again. It was fine when I left it on 18.04 I have tried the solution provided here and it has not sorted ...
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133 views

modprobe: FATAL: Module ip_vs not found in directory /lib/modules/5.4.0-1036-kvm

When I run command: root@net-node01:~# modprobe ip_vs modprobe: FATAL: Module ip_vs not found in directory /lib/modules/5.4.0-1036-kvm I was install ipvsadm with command: apt install ipvsadm But when ...
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Trying to install windows in Virtual Manager/Qemu keep saying that I miss a controler

Using Ubuntu 20.04 I get the error saying that I miss a controller for DVD, USB so I cant install windows in the VM.
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92 views

VM with VLAN trunk on KVM

What exactly do I need to configure on Ubuntu18-based QEMU/KVM server to pass a trunk with >1 VLANs to a VM on it? (basically the equivalent of setting VLAN ID to 4095 on a port with ESXi) Some ...
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20 views

Why x86's “INVD” instruction is not supported in KVM?

I understand that incorrect use of INVD instruction will cause the host machine to crash due to memory inconsistency. But what else? Is there any correlation between CPU virtualization and CPU cache ...
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45 views

How can I get OpenGL to work in a virtualized environment? (Ubuntu host/guest)

I've installed Ubuntu Ubuntu 20.04 as a guest on a Ubuntu 20.04 host using QEMU/KVM with Virtio drivers but I cannot get openGL to work, because if I mark openGL, I cannot boot since I only get a ...
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52 views

Figuring out why MAAS cannot connect to virsh

I'm trying to get MAAS to talk to virsh on localhost to not have to configure a whole extra physical machine to run deployment service juju on. MAAS seems to be able to deploy a virtual machine to ...
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1answer
33 views

bridge on interface with public address (ubuntu 20)

I have a server with one ethernet interface with a public address and i need to configure a bridge for KVM. I know the settings in the local network, where the gateway is on the local address on the ...
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1answer
24 views

Upgrade form 16.04 to 18.04 libvirt ssh no longer working?

After an upgrade from 16.04 to 18.04 we can no longer ssh into libvirt guests from the host. 'ssh vm-web' just fails silently whereas it worked perfectly before the upgrade. The guests are running as ...
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44 views

Running a VM with old version of Ubuntu, what to use?

I am currently using Ubuntu 20.04, but I still have my old PC with Ubuntu 10.04 installation, and I want to keep it available for occasional use (because there are some things in that version that ...
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45 views

Unable to Access the Virtual Machine VM via SSH outside of host machine network

Hi guys I have dedicated server running ubuntu 18.04 I installed KVM & CENTOS 8 VM on the system and I did bridge network settings on my VM and my host machine but when I am trying to access that ...
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58 views

kvm virt-manager adding a device usb-wacom-tablet evdev

I am trying to use a wacom graphire2 in windows10 guest trough virt-manager 3.0 in a ubuntu 20.04 with qemu5 (also tried qemu4.2) in a gpu passthrough environment. Wacom works perfectly with usb ...
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41 views

Netplan with one bond but multiple vlans in seperate file

Installed Ubuntu 20.04 and tried to understand the past few days the netplan configurations. The basic settings I get to work, but I am unable to achieve the below. Would be great if you can guide me ...
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1answer
30 views

Unbuntu 20 KVM forces Console mode out of range tried GFXMODE

Console only no "desktop" I installed 20.04 with a monitor directly attached to it, no problems. Console only no "desktop". I've put it at the end of a KVM, and the monitor's ...
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224 views

Help running windows on Ubuntu [closed]

Please I need some guide? I am using Ubuntu 20, but want to run windows virtually on it so I can use some apps that runs only on Windows for now or that i am yetto fully get ysed to on linux. I have ...
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255 views

How to use Autoinstall from Ubuntu 20.04 with virt-install command?

I use Ubuntu 20.04 desktop as host to run different Linux VMs using KVM. The VMs are created in scripts using virt-install. This works well with CentOS VMs etc. Now I would like to install Ubuntu 20....
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42 views

Ubuntu does not see keyboard/mouse from KVM

I have a new KVM from eLK (8 into 1/HDMI and USB). The KVM successfully passes through mouse and keyboard (which are both plain and generic) to a Windows 10 computer, so I know that the KVM itself ...
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69 views

Ubuntu Installation on Qemu/KVM Black Screen

I'm trying to install Ubuntu or higher on KVM. I have tried installing 14.04.6 LTS / 16.04.7 LTS and 18.04.5 LTS First i create Qemu Disk Image : qemu-img.exe create -f raw hdd.img 5G and when i boot ...
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86 views

No video on Ubuntu 20.04 minimal VM via virt-manager

Environment: Ubuntu 18.04 Server running KVM. Guests managed via Virtual Machine Manager installed on a separate Lubuntu 20.04 machine. All guests running 18.04 up to now, all accessible via SSH and ...
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19 views

How to copy all the necessary patched and working version files of a working qemu / kvm / libvirt configuration from xubuntu 20 to ubuntu 18

I'm trying to emulate windows 10 arm64 on my jetson nano,where I have installed ubuntu 18.04. At the moment ubuntu 18.04 is the only linux distribution supported by nvidia,for this reason I can't ...
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522 views

One cick GPU passthrough to VM in Gnome-Boxes?

Felipe Borges, Gnome Developer, spoke last year about new feature in gnome-boxes that allow simple PCI GPU passthrough to VM. However, I can't find any information on the gnome documentation or ...
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116 views

`error: invalid signature.` when trying to boot Ubuntu Core

I'm following instructions on the following page to the letter: https://ubuntu.com/download/kvm . When I run the kvm command, the VM screen appears containing the following error: error: no such ...
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91 views

What's the difference between ubuntu's amd64-disk-kvm.img and the regular amd64.img cloud images?

On https://cloud-images.ubuntu.com/groovy/current/ there is (among many others) both a groovy-server-cloudimg-amd64-disk-kvm.img and a groovy-server-cloudimg-amd64.img. What's the difference?
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Ubuntu 20.04 KVM Virtual Machien Error

I'm trying to install windows 10 on KVM. When I create the machine I get the following error Expanded details are here: I am using Ubuntu 20.04 64 bit.
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1answer
186 views

Virtual Machine Manager connection failure

I am trying to create a Virtual Machine using Virtual Machine Manager. I have installed the following packages using the command: sudo apt install -y qemu qemu-kvm libvirt-daemon libvirt-clients ...
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46 views

VM internal error

internal error: vendor cannot be 0.' kurulumu tamamlanamıyor. Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper ...
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41 views

Low speed of disk writing under KVM

In physical machines I have Ubuntu 16.04 with QEMU/KVM, virtual machines Ubuntu 16.04 too. Speed of disk writing under KVM extremely low, installation process doing more than day and time on time ...
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72 views

Device for PV <UUID> not found

This is how it looks the drive settings of a VM that I am trying to rescue. $ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 ...
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210 views

Linux KVM: Make Mapped/Shared Folder Permissions RW for Host and Guest

I am tearing my hair out trying to solve this permissions problem where files created by the guest cannot be accessed on the host. Setup: I have an Ubuntu 20.04 host and a Ubuntu 20.04 guest running ...
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55 views

“Legacy Bios Implementation” - Should I update this or not?

The default Software Updater has received an automatic update for "Legacy BIOS Implementation: As can be seen above, this is for updating from Ubuntu seabios version "1.13.0-1ubuntu1" ...

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