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

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Modified QEMU XML file does not appear to be used

I've created a qcow2 image snapshot of a KVM guest image. I've modified the XML file for the image to use the new snapshot file but when I halt and restart the guest, and create a file on the guest ...
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122 views

Accidentally removed a libvirt image file, can I recreate it?

I accidentally removed the wrong image file in my /var/lib/libvirt/images directory. I'm not sure how to recreate one or to undo my removal. Any hints?
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Shutting down kvm guest without acpi

I've got a KVM guest that won't shut down from virsh or from virt-manager. Most everything I've read says to install ACPI on the guest and do a bunch of configuring on the host to make this work. Is ...
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1answer
26 views

migrate i386 qemu VM to amd64 VM host

I have an i386 qemu VM: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 3 model name : QEMU Virtual CPU version 1.1.2 stepping : 3 microcode ...
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1answer
32 views

100% CPU utilisation and hang after virsh migrate

I've been experimenting with ZFS + DRBD + live migration (I want to understand it well enough to write my own automation scripts before I start playing with ganeti again, and then openstack cinder). ...
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16 views

Fedora Host, Kali VM, KVM/QEMU mouse not working

I have a Fedora 23 host, and I tried to install Kali Linux using Virtual Machine Manager, and every time I did it -- no matter how I configured it -- the mouse would not work. It would only go down ...
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19 views

Is there a way to make faster QEMU snapshots without using libvirt?

I have a Lenovo ThinkPad T430 running Red Hat Enterprise Linux 6.7, kernel 2.6.32 and QEMU-KVM 0.12.1 (per corporate policy I am not allowed to run a more cutting-edge distribution or any more recent ...
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19 views

ebtables drop / limit smtp port

I am using bridged devices, main node runs on CentOS 7 and Guest are KVM VM's. I have tried rules as below on host node to block port 25 but was not successful. ebtables -A FORWARD -p IPv4 --ip-...
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How to set up NAT on the host for virtual machines in Fedora 23 with Firewalld, in order to make them visible to other devices on the network?

Host: Fedora 23 Guest: CentOS 7.0 KVM/QEMU Here is what I am trying to do. Set up NAT on the host system (Fedora 23) so that the guest (CentOS 7.0) would be visible from outside (by other devices ...
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39 views

Enable “kvm=off”, “x-vga=on” and “-vga=none” from within Virt-Manager?

I have virtual machine created from Virt-manager, it's Windows. I have attached host PCI device (GPU) to the guest VM, it's recognized, but not used I know options x-vga=on and -vga=none are friends ...
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25 views

IP NAT Routing with systemd-networkd and KVM

my setup looks like: KVM Hypervisor Ubuntu 15.10 with libvirt systemd-networkd configuration ==> 10-static.network <== [Match] Name=eth0 [Network] Bridge=br0 ==> 20-bridge.network <==...
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1answer
29 views

problem of denied access using kvm

I would like to test kvm with opensuse tumbleweed. I successfully installed kvm, but I am stuck in creating my first VM. The trick is that I want to have the VM's directory in an external HDD. When ...
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2answers
49 views

libvirt: command to start up all guest virtual machines which have auto-start enabled

I'm using Debian Jessie as a virtual machine host using libvirt/qemu/kvm. I've set some of the guest virtual machines to automatically start when the host OS boots up, this is working fine. For ...
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1answer
22 views

KVM guest access to host usb-serial dongle

I have a KVM virtual machine running CentOS 7 on a host running Fedora 24. I have a usb-serial dongle (actually a RFID reader but that should really not matter) that is installed on the host. The host ...
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18 views

How can i make incremental backup?

I have a linux based HOST system with KVM. And a GUEST system using Windows Server 2012R2 on a lvm partition. How i can make an incremental backup of this lvm set? Or better yet, how can I make a ...
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38 views

Virtual Machine failover with KVM [closed]

I'm trying failover of VM's in KVM Linux as a learning program. Scenario: 2 HV Bare metal (2 physical servers) having CentOS with KVM. On both the HV there are multiple web-server with guest ...
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1answer
21 views

Moving VirtualBox disks to cloud services

Currently, the official way of deploying a custom distribution or different operating system on Linode is installing it locally in a virtual machine and copying the resulting disk verbatim to a Linode ...
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1answer
31 views

Proxmox hook for VMs

We have Proxmox installation. We want to execute a command after new VM was added. It is required for QEMU port redirection since setting redir option is not avaialble on GUI: qm set 102 -args "--...
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20 views

Input/output error when copying Qemu raw image

I'm trying to clone a VM on a CentOS 6 server using virt-clone, but every time I run it I get: ERROR failed reading from file '/var/lib/libvirt/images/myimage.img' : Input/output error I've also ...
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20 views

KVM snapshot slow booting after some time

I'm using Red Hat system and using KVM for virtual machines. Currently I have 8 snapshots in my virtual machine called "Win7", where each snapshot is built based on the snapshot before to fix some ...
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49 views

How to migrate all the memory pages of a process from one NUMA node to another NUMA node?

In Linux, I want to migrate the memory pages of a KVM virtual machine from one NUMA node to another NUMA node on runtime. But I cannot find any interfaces to do that in the KVM hypervisor or using the ...
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1answer
43 views

How to make the Windows guest machine use more the one CPU?

I do believe this question has been posted before not only here but on Linux forums as well. However I could not implement the solutions, I am probably missing something obvious. KVM Host: Fedora 23 ...
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31 views

Assign Static IP to KVM CentOS Guest.

I am attempting to set up a CentOS(7) guest on my Linux Mint(17.3) system using KVM. My Mint host has a static IP (10.10.16.247) configured already and is currently fully network functional.I have a ...
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1answer
167 views

Accessing Console Of Ubuntu 16.04 KVM Guest

When I added Debian 8 to my KVM management tool, I found that I could not access the console unless I added console=ttyS0 to the grub boot configuration. It wasn't great but it worked. I am in the ...
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1answer
50 views

How to avoid the difference in options that were used for creation of ext4 partitions on different Linux distro?

I have some set of scripts that create qcow2 file with grub legacy (0.97) with special patch to boot from ext4 and ext4 file system for '/'. When I run those scripts on Ubuntu 12.04/14.04 the VMs ...
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46 views

Use of virtio on QEMU without KVM

I want to write a simple driver for use inside a QEMU virtual machine, which will be communicating with the host through a respective backend special virtual device. The said driver and backend ...
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105 views

GPU pass-through KVM Fedora 23

I am attempting to pass a GPU to a windows 10 VM running on a Fedora 23 host: Virt-manager Host: Fedora 23 Guest: Windows 10 64 bit guest UEFI OVMF GPU: R7 AMD Radon 250 is the GPU that I am ...
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28 views

Firewalld forwarding between zones not working

I have a centos 7 kvm hypervisor running multiple VMs that are configured to use NAT networking. These VMs run their services, of which ssh is the most important for administration purposes. I would ...
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1answer
136 views

Android-x86_64 installer does not boot in QEMU/KVM - EFI Shell appears instead

I downloaded Android x86_64 5.1-rc1 as bootable img installation image. I want to install it to a virtual machine running on Ubuntu 16.04 64 bit with UEFI using QEMU/KVM and virt-manager as graphical ...
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1answer
258 views

Arch linux ( kvm/qemu virtualization ) failed to open libiscsi.so.4

I have fallowed the steps from Arch Linux #KVM and #qemu 1) sudo pacman -S then installed libs libvirt libiscsi libaio qemu qemu-arch-extra qemu-block-iscsi qemu-block-rbd qemu-block-gluster ...
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23 views

Which ports to open in ufw for Windows in QEMU

I'm running Windows 7 in QEMU under Debian using bridge-networking. However when i have ufw enabled and start Windows i can not connect to the Internet. As soon as i disable ufw the virtual Windows-...
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46 views

CVE-2016-3710 mitigation in CentOS 7

I have a box running CentOS 7 for KVM virtualization purposes. What is proper steps to mitigate CVE-2016-3710 in my OS? $ rpm -qa --changelog qemu | grep CVE-2016-3710 shows nothing. Current ...
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292 views

Able to ping my host but getting no route to host

I have a elasticsearch service running on MY_HOST_IP(10.x.x.xx) and port 9200. I am able to ping 10.x.x.xx from my VM, but when I try to connect elasticsearch it gives me : no route to host ...
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24 views

Qemu/KVM, windows guest password prompt

Ubuntu 16.04 Qemu/KVM Windows 8.1 guest SSH from remote host into hypervisor, run virt-manager. Get prompted for creds: user1@hypervisor, authenticate successfully. Open guest, get prompted for ...
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2answers
151 views

Ubuntu 16.04, drive path changed on its own [duplicate]

So yesterday I had a grub issue that required me to comment out the other two drive sin my fstab that get mounted. 1. an ssd that houses my qcow2 vm. 2. a 1tb seagate So all I had listed was / and ...
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100 views

Qemu/KVM assign usb input devices to VM

So I have an Ubuntu 16.04 host running Qemu/KVM and a Windows 8.1 guest. I have successfully gotten the guest to use both a dedicated video card and dedicate monitor.. however I cannot figure out the ...
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34 views

UUID of LUKS changes when cloned

I am trying to install Centos 7 (under LUKS) on a virtual machine in Fedora 23 using virt-manager and after that to clone that image to multiple USB drives. The problem is that the virtual machine ...
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1answer
76 views

Execute command inside guest vm Libvirt

Is it possible to execute a command for eg:iostat inside a guest VM using libvirt or virsh .I want to find out IOPS for a guest vm but with libvirt java api I am not able to get the IOPS of a vm ,...
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27 views

Remove devstack dependencies Ununtu 14.04 (32 Bit Dell Lattitude 5500)

I installed devstack in my old laptop. After installation when I try to access OpenStack, my laptop became very slow. Then I realized, that laptop had only 2 GB RAM. I ran unstack.sh and delete ...
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43 views

Performance issues running Linux Mint on qemu-kvm - maybe run in textmode and use remote graphics for administration?

we are running virtual servers on kvm-qemu, using debian wheezy as a host system. Unfortunately one server is based on Linux Mint 17.3. One big issue is the performance of Linux Mint based on kvm. ...
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46 views

KVM on Crouton chroot?

I've enabled Vt-x support in BIOS, and have been trying to get KVM on my chroot for a few days now. I lost my chroot last night (got it into an unbootable state) trying and had to build a new one. ...
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56 views

Select graphics card

Is there a way too to select a primary graphics other than onboard graphics. I have two different dedicated graphics cards in my machine, one GT640 and a GTX970. I am trying to set up the machine to ...
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0answers
18 views

Is it possible to setup a bridge configuration where only the host can access a VM, but not the other way around and no VM->VM?

I have a KVM hypervisor set up with several VMs. A docker instance runs in each of them (for security purposes the containers shouldn't run on bare metal next to each other). Is it possible to ...
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Does 32-Bit OS need hardware virtualization to run o KVM?

I have a 64-bit CPU that doesn't support virtualization. My understanding is Whonix is a 32 bit OS. Will I be able to run Whonix on KVM?
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Does Linux perform buffering twice when hosting a VM?

I ran a KVM VM on my CentOS host and found that after performing a HDD-intensive operation, it used all of the host's memory I assigned to it. However, free on the guest suggests that the memory's ...
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34 views

hid_generic module not loading

I have two Debian systems connected to a KVM switch. On one system the KVM is recognized and the hid_generic module loaded without any issue, on the other one lsusb show the device but the hid_generic ...
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1answer
35 views

Bridging two virtual machines on difference bridges

I have two VMs: vm1 & vm2. The host and VMs both are Ubuntu 14.04 LTS. Each VM "connects" to a bridge which connects to a virtual ethernet interface and end up at eth0 i.e. vm1 (192.168.0.23) -&...
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114 views

CentOS 7, KVM.. auth failed: no agent available

So like the subject suggests.. CentOS 7.2 minimal + KVM install. I had the VMM working via X11Forwarding last night. After a reboot though I get this: authentication failed: no agent is available ...
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183 views

GPU Passthrough with qemu - no video output (AMD 7970)

I am trying to setup GPU passthrough on Arch. I followed the PCI passthrough via OVMF wiki along with some other resources online. I substituted a few steps as needed, for example I am using systemd-...
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1answer
116 views

KVM virtualization for CentOS 7

I am having an absolute devil of a time with KVM. It seems every HOWTO out there offers a different list of packages, and I've installed them all: [me@tarantula ~]$ rpm -qa | egrep 'kvm|qemu|virt' ...