KVM is the Kernel Virtual Machine, a virtualization hypervisor built into the Linux kernel.

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KVM and peripheral devices

How does KVM work with peripheral devices? Are devices emulated in user space or in kernel space through the device driver? The host and guest operation system cannot claim both a device, and how ...
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Debian Kickstart Files Failing To Download

I have found that if I try to host my kickstart files on github and pass the raw url to virt-install, such as below, it will fail. ...
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Binding/unbinding GPU between host OS and pci stub while host OS is running

Using a Debian 8 host, I'm interested in setting up a Windows VM guest which get's direct access to my dedicated/discrete graphics card, to see what sort of performance I can get out of it for games ...
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Boot failed not a bootable disk in Kvm

I tried a create a redhat vm in kvm but while booting ut says boot failed cannot boot error. can someone help me in assisting that? Thanks DJ
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Qemu overlay image size limit

I created a qemu ubuntu vm. Now I use overlay images as a quick way of creating vm's "on the fly". But what is the size limit for an overlay image? Is it the size of the "base" image? Or can it grow ...
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36 views

qemu command line management

I'm interested in qemu, specifically the kvm feature in Linux which is operated through the command line. I see there are a ton of features available for gnome-boxes and libvirt specifically. My ...
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Debian server management GUI

I have to manage a number of Debian servers (one as the KVM host, and the others as virtual servers for File management, Infrastructure management - DNS, DHCP etc, and finally a Debian based ...
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15 views

Kickstart with NFS does not work on static IP on KVM

I am using virt-install to use KVM qemu to launch centos VM. The DVD extracts of centos are hosted on a NFS server. The kick start has the line. network --onboot on --device eth0 --bootproto dhcp ...
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35 views

enabling vnc after using virt-install

I've created a virtual machine using virt-install with graphics --none. I want to enable vnc. I've tried virsh -c qemu:///system qemu-monitor-command vm171-SC-1 --hmp change vnc :3 but it doesn't ...
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23 views

Is it possible to allocate slices of disk to a KVM storage pool?

When using virt-manager to create a storage pool it does not give the option to set the size. Instead, it assumes that an entire partition is available to the pool. I would expect this to cause ...
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33 views

How to send mouse and keyboard to Virt-Manager guest

I have a Windows guest in virt-manager running headless (no spice server) because video is output through a GPU (pci passthrough). But my question now is how to send the keyboard and mouse to the ...
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222 views

Install VM from command line with virt-install

Disclaimer : I now use virt-manager to create and manage my VM and it is really a life saver. It can be used remotely if the host does not have graphical display. The occurrences of vnc in the ...
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82 views

How to send/upload a file from Host OS to guest OS in KVM?(not folder sharing)

I have to make a configuration file available to guest OS running on top of KVM hyper-visor. I have already read about folder sharing options between host and guest in KVM with 'qemu' and 9P virtio ...
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How to mount a path into a kvm?

I have a Windows machine inside a kvm machine on a Linux system. I would like to mount /home/myuser/Documents into 'c:\Users\myuser\My Document'. How can I make the D: drive be an alias for the ext3 ...
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2answers
227 views

Debian 8 KVM Guest - Loading initial ramdisk

I have updated my KVM management script for Ubuntu 14.04 KVM hosts to support debian 8 guests. After a manual installation (preseed script does not work yet), I am stuck with the the following message ...
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99 views

Why is 'steal' time gradually increasing?

I'm tracking CPU usage on a VM on a lightly-loaded host. Everything appears to be functioning normally on all the VMs, but collectd is reporting a gradually increasing 'steal' time: The actual ...
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2answers
87 views

How to connect from home PC to Virtualbox/KVM that hosted on Ubuntu server?

I have an Ubuntu server, it's 3TB HDD space total and 24GB RAM, I want to take 1 little bit of space and RAM to make VPS Windows using VirtualBox or KVM. I want to install Windows Server 2008 on ...
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217 views

Why Debian Jessie is turned off instead of rebooting after installing qemu-kvm?

I'm using a new stable Debian Jessie (minimal installation without DE and standard utilities). First of all, I set 'enabled' for Intel virtualisation in BIOS and installed qemu-kvm as usual: # ...
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74 views

Modifying files inside a snapshot (qemu img file)

I have taken a snapshot recently to assist me build VMs quickly with the operating system I desire (through virsh), however, every time I build a VM, I would like to modify few files inside the img ...
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Is there a way to emulate a wireless card in qemu / kvm?

Is there a way to emulate a wireless card in qemu / kvm? Or is there no point to this? Is it considered just another interface?
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Passthrough PS/2 keyboard to guest OS

OS Windows run on VM (ubuntu, libvirt, qemu-kvm). And I have PS/2 keyboard on host hardware. Is there any way to pass it to guest OS without lost of performance (maybe emulate USB keyboard with keys ...
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2answers
102 views

Add virtual bridge without the loss of networking?

There is a dedicated server without KVM-over-IP support. The server 'owns' two IP addresses, and one of those is used for eth0 at the moment. The user needs to add a virtual bridge, in order to ...
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Virtualization on Intel Edison

I want to do virtualization on the Edison. (Edison has vt-x.) On Yocto linux there isn't anything in the repo that is useful. On Ubilinux there is KVM but there is no kernel module in aptitude package ...
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kvm virtual manager connection failed

I installed kvm package in the centos7 i am getting this problem how to solve this. full error is here Unable to connect to libvirt. no connection driver available for qemu:///system Libvirt URI ...
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82 views

Debian - qcow2 lazy_refcounts

I have just configured a debian 7.8 server with KVM and tried to preallocate a disk image with the following command: qemu-img create -f qcow2 -o preallocation=metadata,lazy_refcounts=on ...
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Packets drops seen in physical interface while using kvm bridge

In ubuntu kvm hypervisor we are seeing packet drops in the physical interfaces once we create the bridge. Below is the output of ifconfig, br1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx ...
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119 views

Configure KVM/QEMU with TLS?

New to virtualization and kvm and I have a problem when i try to create a virtual machine with spice: virt-install --name Windows-7-x64 --ram 2048 --disk path=~/kvm/images/win7.img,size=50 --vcpus=1 ...
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Running Mac OS X under KVM/QEMU

Note to be removed in the future, so as to avoid confusion from answerers and mods edit: Forgot to add in the note, if anyone thinks this is the wrong stack-site to post this, please comment on why, ...
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124 views

How can I configure multiple tap interfaces for a single KVM virtual machine

I am trying to setup a VM using Linux KVM for a F5 BIG-IP VE deployment (used in a lab) ...
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49 views

How do I detach, then re-attach to a kvm spice session?

I have started a kvm session with typical qxl and spice options. The vm is running in the background via nohup. I then started the spice client on the same host, using it to log in to the vm's gnome ...
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81 views

how to check default cache mode for disk in kvm

KVM/qemu support various types of cache - none, writethrough, writeback. How to check which one is default and is used on system when no cache= is specified? For RHEL6 i found that it's writethrough ...
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Connection issues with KVM on RHEL6.5 to Licence Server

I currently have a RedHat 6.5 kvm running under a RedHat 6.5 host. I am attempting to make a connection to a Rational Apex licence server on the local network, however the connection times out before ...
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88 views

Slow Download/Upload speed on KVM on Centos 6 server

I installed KVM on centos 6 dedicated server but the Download/Upload speed was very slow. The operating system on KVM is Windows XP. Download/Upload speed on Centos 6 is faster 10 times than on KVM. I ...
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Linux GPU Pass-through Virtualization - Verify wich component causes trouble

GPU Passthrough Virtualization with KVM or VirtualBox For a research project I need to passthrough a PCI GPU from a Ubuntu Host to a Windows 8.1 guest. We need to test a certain setup, where the ...
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Why is qemu-kvm needed in Debian Wheezy when running qemu with “-enable-kvm” option?

I have a HP Compaq 8200 PC with Intel i5 CPU. I have enabled VT-x in BIOS: ..and CPU supports VT-x as it has vmx flag present in /proc/cpuinfo. I have loaded the kvm LKM: root@VM-host:~# modprobe ...
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Debian wheezy - hanging on shutdown

My debian system hangs when I'm trying to shutdown/reboot. It hangs on: kvm: exiting hardware virtualization (infinitely blinking white cursor) I've tried to shutdown by gui and by ...
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Outgoing masquerade address changes after adding a second interface to the bridge

In fact I have the following configuration: extrouter(192.168.1.1) <- wifi -> [eth2 (192.168.1.11) Centos 6/6 based host br0 (172.22.5.254)] br0 contains two tap interfaces (tap0/172.22.5.1 ...
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(virt-manager:4796): Client failed to connect to the D-BUS daemon / Unable to connect to libvirt

I would like to boot and run Windows 8 with kvm or xen while I'm running Debian Wheezy. Actually I have installed Windows 8 on the external USB disk and Debian Wheezy on the hard disk sata. I'm tryng ...
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223 views

Question about CentOS and KVM virtualization and PCI Passthrough

I want to replace Windows Server 2012 R2 and Hyper-V on my homeserver with CentOS and KVM. My plan is to virtualize one Windows 8.1 machine and several smaller Linux machines like on Hyper-V, there is ...
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309 views

Using of qemu-system-x86_64 with key -enable-kvm on VirtualBox

I have windows 7 as host. I launch virtualbox with ununtu 14.04 on my Windows 7. I try to launch debian inside Ubuntu: qemu-system-x86_64 -enable-kvm -hda disk.img -boot c -m 256 -localtime. Another ...
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Win7 file sharing VM latency

I am using mount/umount commands with a Win VM on a KVM Linux host. I have a script that continuously loops: sleep 1 sec mount read guest file unmount When I change a Win7 file (say, a text file ...
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102 views

Assigning static public IPs to Proxmox KVM guests

I'm currently using 5 public IPV4 addresses on a physical machine running Ubuntu Server, which I intend to replace with new hardware running Proxmox. I'll do a P2V of the current Ubuntu install into ...
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1answer
83 views

rtorrent won't start downloading (to 9p shared folder)

i am running rtorrent in a ubuntu-VM. the vm's host is sharing a folder "downloads" with the vm, which is mounted inside the guest by adding the following line to /etc/fstab: downloads ...
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1answer
107 views

KVM Disk Image File Path openSUSE

I need to enable networking for my guest KVM Windows 10 VM under openSUSE Tumbleweed host. I need the default file path for the virtual disk image as per here. Running the following command: ...
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Share files between Linux host and Windows guest

I am trying to share files between Linux host and Windows guest and I came across the link: Use virt-manager to share files between Linux host and Windows guest? As suggested in the third answer, I ...
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Why Linux inside KVM gets busy after I put the host to suspend-to-ram?

I run another Linux instance inside KVM on my laptop. When I suspend-to-ram the laptop and wake it up again, the guest Linux starts consuming 100% CPU for some time (maybe proportional to the sleep ...
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unable to start vm on kvm

I'm not able to start a vm on kvm with the following error [root@dev1 RHEL5-7]# virsh start demo-57-test error: Failed to start domain demo-57-test error: Unable to add port vnet0 to OVS bridge br0: ...
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635 views

Qcow2 snapshots - snapshot for disk vda unsupported for storage type raw

I am running a KVM server (Ubuntu 14.04) and would like to take snapshots of my guests. I was reading how about how to do that in this article. It seemed as if I should be able to take a snapshot of a ...
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122 views

Network setup of KVM hypervisor?

I would like to install a KVM type-1 hypervisor. This hypervisor should run two guest operating-systems. Both guest operating-systems need one IPv4 address from 192.168.11.0/24 network and I guess ...
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kvm console not working at login [centos on centos]

When I run the following $su $virsh console myvm I keep getting login incorrect , even though I'm typing the correct password. In fact, it does work if I use virt-viewer. What could it be?