QEMU stands for "Quick EMUlator" and is a processor emulator that relies on dynamic binary translation to achieve a reasonable speed while being easy to port to new host CPU architectures.

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Qemu: can I set the serial number on a virtual SCSI device?

I'm using libvirt+KVM+Qemu on Ubuntu 11.04. I have some scsi devices like this: <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source ...
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435 views

Give a KVM Guest only access to OpenVPN

I'm in a kind of weird situation where I need to do the following: Connect an OpenVPN tunnel with static RFC1918 IPs (think of 10.3.3.1 for the server end and 10.3.3.2 for the client end) and have it ...
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2answers
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Changing boot device for a QEMU-KVM virtual machine

I am trying to change the boot device for a VM. I go to the VM's XML file in /etc/libvirt/qemu and set <boot dev='cdrom' />. Still, it attempts to boot from the harddrive instead of the cdrom. ...
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1k views

How to add a serial COM port to Windows server 2008 using Linux + KVM + Qemu?

We are using Linux + KVM + Qemu with libvirt on our servers to manage virtual WIndows 2008 Servers. The Host is Ubuntu 11.04. The point is on one of our Windows server 2008 guest, we need to connect ...
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1answer
1k views

Set Mac Address in QEMU/KVM properties file

I'm trying to set the mac address for my virtual machine in the virtual machine properties file. The properties file '102.conf' currently looks like this: name: vm1.mydomain.com bootdisk: ide0 ...
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556 views

Maximizing throughput of virtual file systems

I've been using a QEMU system to build software. The problem I've been having is that the system seems to suffer from extremely slow disk access. This is not necessarily a problem as it's not really a ...
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1k views

setting CPU cache size and model for KVM guest

Is there any possibility to create a custom CPU model for KVM Linux guests, or at least to modify parameters such as cache size and model name? I know I can set CPU features, topology and pinning and ...
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841 views

qemu-kvm save and restore in different machines - Offline migration

I am using KVM in cents 5.6. I am trying to do offline migration between two machines. I have a common NFS server. I initially save the state of the running VM (on machine1) to a state file using : ...
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CentOS 5.4 No package qemu available

I'm trying to install qemu on CentOS 5.4(final) with: yum install qemu The result is: Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.steadfast.net * ...
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799 views

KVM / QEmu / Libvirt I/O lockup

Simple issue. I'm running 5 KVM/QEmu instances. the host machine is constantly freezing for about a half a second in every 5. Disk LED hints that it is disk write related. Host is FC14, guests of ...
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Libvirt command line arguments using xml config file

I am trying something similar to http://wiki.libvirt.org/page/QEMUSwitchToLibvirt#-s . This is my xml file : <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> ...
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270 views

I cannot see any files after running qemu-img convert

I have run sudo qemu-img convert box-vmware-disk.vmdk -O raw /dev/sda1. No error was encountered all seems to have ended ok, but when I open the hard disk I cannot see any files. I want to be able to ...
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2answers
196 views

virtual interface names in qemu/kvm

I have an image with a debian-squeeze installation and using that I created two overlay-images to boot two (nearly identical) virtual machines from. When I boot them up individually (connecting them ...
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1answer
847 views

Using qemu-kvm images with Mac OS X?

i am a big fan of qemu-kvm, i've several instances running on servers running ubuntu linux. I now wonder if it's anyhow possible to use a virtual server image on an Mac OS X machine. Either by running ...
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458 views

9p filesystem interacting badly with KVM savevm snapshot

I have a 9p mount inside a VM. I take a snapshot of the VM state with savevm <snapshot>, stop the VM, then restart it with that snapshot (with kvm -loadvm <snapshot>). When I try to ...
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647 views

Why is KVM Host server CPU utilization very high, when the windows guest is idle?

I have Win 2008 running on a Ubuntu 10.04 host using KVM/QEMU. The version is 0.12.3. Event thought the Win 2008 is idle (no updates, most services are turned off), on the host server one of the core ...
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2answers
759 views

is it possible to install qemu inside linux ami on ec2?

well i tried to install it but gont an error . kernel-2.6.35.11-83.9.amzn1.i686 has missing requires of mkinitrd >= ('0', '6.0.91', None)
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249 views

Guest Access in QEMU-KVM

I am having trouble in accessing my Guest OS running on QEMU-KVM. However, I noticed that the Guest OS is capable of accessing Host OS easily thru telnet; basically every IP address appear in ifconfig ...
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1answer
231 views

KVM QEMU looses USB devices

I have a KVM Qemu setup. I'm mapping a USB device to a VM running windows vista. I get the device mapped, and all is well for some time. Suddenly the device disappears in Vista. If I do "lsusb" in ...
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3answers
3k views

Convert directory to QEMU/KVM virtual disk image

I have a directory filled with data at /var/backups/disk1 that I want to convert into a virtual disk image which I'll then be able to boot using QEMU or KVM (the directory contains the file system for ...
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645 views

Error: running qemu on powerpc

I have installed qemu-0.13.0 on x86 system. I downloaded debian-powerpc image from http://people.debian.org/~aurel32/qemu/powerpc/ and used it with this command $qemu-system-ppc -hda ...
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How to migrate KVM based VMs running in LVM setup to Vmdk images

I am using KVM on Ubuntu Server 10.04. and Virtual Machines are running on it in LVM. I have to migrate some of them to Vmware server.How can I achieve this? I searched and came across some links but ...
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4answers
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Is it possible to run KVM over a qemu emulated powerpc architecture

I understand that qemu uses binary translation to emulate machines, so irrespective of the underlying architecture, it can provide emulation. And, KVM uses Hardware Virtualization technique to make ...
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433 views

How to install kvm in Debian (Lenny) over powerpc

I want to install kvm on debian(lenny). I have learnt that packages kvm and qemu-kvm are not available for powerpc architecture. I have found two packages(kvm-source & qemu) and installed it. Now, ...
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Difference between KVM and QEMU

I have been reading about them for sometime. As of now I have a clear understanding of what they do. KVM supports hardware virtualization to provide near native performance to the Guest Operating ...
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1answer
861 views

Run a KVM machine with qemu

I'm facing a strange problem. I thought that kvm was just a modified version of qemu for hardware acceleration. Now I'm trying to run a VM on different computers using qemu without acceleration. This ...
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1answer
720 views

libvirt, qemu, reboot hook

Is it possible to detect that the guest VM has rebooted and perform an action using libvirt / qemu? The hooks here only support the "start" and "stop" events. I would like to detect if my VM has ...
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1answer
182 views

Booting ubuntu with libvirt pass in custom script to be run from rc.local

I have an ubuntu image that I start under libvirt/qemu. I'd like to pass in a custom script at boot time that can be executed from rc.local. I can do this with Amazon EC2 instances via their ...
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2answers
1k views

How do I run a stable Windows XP kvm guest on Ubuntu 10.04?

I have three Windows XP guests running on a recently upgraded 64-bit Ubuntu 10.04 system. Occasionally (on the order of once every few days), one of the guests will become non-responsive and the kvm ...
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1answer
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How to convert a raw disk image to a copy-on-write image based on another image for use with kvm and virt-manager?

I have a virtual Windows machine running on kvm. Presently it has a 90GB raw disk image. I would like to clone this VM without having to keep two copies of the 90GB raw disk image around. It seems ...
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1answer
630 views

Linux Virtualization Options on EC2

I need to subdivide EC2 (or perhaps other cloud provider) instances. I know you cannot run a full virtualization stack on another. For instance a Xen guest cannot host a VirtualBox guest. So this ...
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2answers
400 views

Internet Forwarding With Qemu?

I'm using kvm and qemu to run a windows virtual machine, but I'm trying to get internet on that machine. I've been reading about all this bridging and stuff that is done to do that, but I was ...
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3answers
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libvirt and qemu/kvm -snapshot option

Using libvirt, I want to use QEMU's '-snapshot' option. That way, when the machine shuts down, all of the disk changes that were made get destroyed. Here is the manual for the -snapshot option: ...
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1answer
13k views

'Unrecognised disc label' - when using parted with qemu images

I have a Linux from scratch LiveCD running on qemu vm. I'm using this command to create a hda disc for qemu: qemu-img.exe create -f qcow2 base-linux.img 5G Then I run my vm: qemu.exe -m 1024 ...
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1answer
488 views

libvirtd kvm networking on Centos5.4

I've got KVM installed on CentOS 5.4, and am attempting to set up a virtual network to allow each VM to communicate with services on the host, namely DHCP to allow PXE boot installations. I'm having ...
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2answers
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How do I mount an .iso with another (live CD) .iso?

I want to: Place the .iso of a live CD in a directory. Use qemu (kvm or kqemu) to run the .iso Put a 2nd live CD .iso in the same directory. Have the 1st live CD mount the 2nd .iso. Say, I have 2 ...
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3answers
920 views

KVM/QEMU emulation of processor virtualization features

I'm finding the developer documentation of KVM/QEMU to be weak/nonexistent and cannot actually find the answer to this question anywhere, does KVM/QEMU or any other virtualization product yet support ...
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3answers
806 views

Change virtual QEMU image location

I've got an existing QEMU Virtual Server running on Fedora 11. Having troubles trying to find out how to change the location of where the Virtual Images are stored. Can anybody provide any help ...
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1answer
519 views

How do I extend the virsh/qemu/libvirt Timeout?

There's a known issue with starting virtual machines with large hard drive images. Apparently, the time-out is 3 seconds, but in reality, it can take up to 15 seconds for a machine to start. I've read ...
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2answers
2k views

Qemu: issues with bridged networking (Linux host, OpenBSD guest)

I have a computer running Linux. It has qemu installed. It has a bridge interface br0 configured with the following settings: IP: 10.1.1.1 Netmask: 255.255.255.0 There is also a tap0 interface that ...