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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Guest OS Ubuntu-server do not boot after installation, qemu

I have an Ubuntu server used for visualization I started by installing A Guest Ubuntu server. The installation finished. The VM was shutdown. I started the VM from Virsh. I logged in through VNC ...
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13 views

Virtualize an existing windows 8.1 installation on arch [migrated]

I have the following setup: Intel i5 4570s SSD for os sda1: EFI boot partition sda2: ext4 with arch installed sda3: swap sda4: microsoft reserved sda5: ntfs with windows 8.1 installed HDD for data ...
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14 views

List all devices emulated for a VM

I have created a VM with the below command in qemu . (KVM enabled) #qemu-kvm -m 1024 -enable-kvm -hda /var/lib/libvirt/images/fedora.img NOW, VM is launched. I would like to know the exact devices ...
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1answer
58 views

Bridging is breaking the server: KVM configuration

I'm pretty new to networking and just can't get my head around this. I'm trying to setup KVM-Qemu so I can run some virtual machines. The instructions I'm following are telling me to use eth0 and ...
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6 views

How to bootstrap a MIPS NetBSD iso in qemu? [migrated]

I'm trying to bootstrap a NetBSD 4.0 iso in qemu, but am not having much luck. My host computer is running OS X, and I successfully installed qemu with homebrew, but have been unable to bootstrap the ...
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1answer
30 views

How to mount a URL as a CD-ROM on QEMU?

I'm wondering if it's possible to specify a URL for the cdrom option on QEMU, and if so how would I go about doing that? Normally I'd mount an iso like this: <disk type='file' device='cdrom'> ...
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1answer
89 views

Qemu - Disk Type, SATA Controller Questions

This is not so much of a question asking for an answer as it is just looking for an explanation. Imagine the following scenario. I have a Windows 7 Laptop, Dell Precicion M4500 series, with an SSD ...
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1answer
61 views

Disable TCP checksum offloading on KVM virtual network

I have a virtual network for connecting KVM guests with the host. I need to disable TCP checksum offloading on this network. The ethtool works fine but I want to disable it permanently and I could ...
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1answer
60 views

How can I set up a VM of Solaris 11 / Sparc on Windows / x86 host? [closed]

I need to test a custom binary that was originally compiled for an earlier version of Solaris on Solaris 11. Being poor, I don't have a spare SPARC server lying around on which I can install Solaris ...
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1answer
39 views

Implementing hardware virtualization for custom hardware

When using QEMU/KVM there are certain network adapters that are supported and emulated. If one wanted to emulate the guest OS's original network adapter (e.g - a Broadcom interface that was present on ...
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1answer
19 views

Is there any complete tutorial for setting up a full QEMU-KVM from hypervisor to host through command line ?

I've found parts about how to use virt-install from scratch or almost like http://virt-tools.org/learning/install-with-command-line/ However I'm stuck at connecting to the VM through virsh once the ...
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17 views

Qemu/KVM: packet queueing from/to guest

I am new to virtualization and trying to understand the pakcet path from guest to physical nic and vice-versa. I am partiaularly interested in understanding what are the various queuing points from ...
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1answer
64 views

KVM virtual machine boot messages

Just wondering if anyone knows of a way to stop the following boot messages with a centos 6.5 vm created with qemu-kvm When I start the vm there is a slight delay as the vm posts the following boot ...
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3answers
75 views

Why I can't save network changes with virsh?

I am trying to add fixed address to specific virtual host, therefor I closed virtual machine and used sudo virsh net-edit somenet. After adding line <host mac='52:54:00:26:61:22' ...
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1answer
71 views

QEMU's QMP to listen on same socket?

Is it possible to have multiple qemu processes (machines) to listen on the same socket? I.e. you have this identical part when starting qemu processes: -qmp unix:./qmp-sock,server,nowait --monitor ...
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1answer
26 views

Debian keymap changing with qEmu?

Here's the context : I have a Debian 7.3 as the host system (with LANG=fr_FR.UTF-8), on which I'm running virtual machines with qEmu (for educational purpose only). I've created a disk image on which ...
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1answer
183 views

Why can't I shutdown running kvm instance?

I have running kvm instance: =# virsh list --all Id Name State ---------------------------------------------------- 2 debian-test running When ...
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60 views

Networking issues KVM

I have a server that is running Debian 7.2. I recently set up KVM on it, and created two VMs. Both VMs are unable to connect to the Internet. I was following a tutorial, and I'm certain I followed the ...
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1answer
83 views

Knowing when a qemu vm shutdown (initiated via telnet using QMP) is finished

When I start a qemu (Windows Server 2003) virtual machine with -qmp tcp:127.0.0.1:4444,server,nowait I can make it shutdown with the following script #!/bin/bash telnet 127.0.0.1 4444 <<JSON ...
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1answer
158 views

how to connect multiple kvm/qemu VM guests in to a subnet [closed]

I want to setup a simple subnetwork of KVM/QEMU guest VMs living on a single host (Fedora 19) for testing purposes. The subnet would contain 3 servers: 1 Debian 6.x eth0 ip: 10.0.0.7 eth1 ...
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1answer
50 views

What can be improved in my first qemu/kvm run?

Just started using kvm (qemu? I'm quite fuzzy with the terminology). To test if everything works fine, I created logical volume on my lvm, and then started virtual machine using: qemu-system-x86_64 ...
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190 views

KVM guest cannot write to 9p share owned by non-root

I am aiming to set up full write access to a 9p share for a KVM guest. Both host and guest have the same users/groups with the same IDs. Both host and guest should be able to write to the share using ...
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2answers
37 views

Qemu switches to “stopped” state during bootup

I recently tried to boot up my image of Debian and noticed that during bootup, Qemu - according to the window title - switches it state to QEMU [stopped] and doesn't respond. I checked qemu-kvm and ...
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105 views

KVM/QEMU virsh blkdeviotune error

when trying to limit guest disk IO i get an error: virsh blkdeviotune DOMAIN hda error: Unable to get block I/O throttle parameters error: internal error cannot read total_bytes_sec Im using ...
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71 views

LIBVIRT Bridge using VLAN basics

hello I read many posts but all are assuming single NIC, in my case my guest has 2 nic, eth1 is getting IP from libvirt default NAT 192.168.122.x range I want eth0 192.168.0.x subnet, I have created ...
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25 views

How to forward one port to a QEMU instance running on a CentOS 6.4 server?

I have a QEMU instance running on a CentOS 6.4 server. I need to make it so that when one connects to port 23 on the host, they connect to port 23 on the QEMU instance's guest OS. How can I accomplish ...
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1answer
77 views

Why don't the symbolic links in kvm autostart not work

I've deployed 2 kvm guests( db and app) on a Debian7 host. I can set them autostart by root@mhost:~# virsh autostart db root@mhost:~# virsh autostart app This actually creates 2 symbolic links at ...
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1answer
54 views

How to find device in /dev

I have added a new virtual pci device to my debian6 VM (Virtual Machine). I can see the device via "lspci" command, but I cannot find it in /dev. Is it because it's not installed properly or it needs ...
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71 views

qemu-img rebase operation taking longer than expected

#ls -1 Image1.qcow2 #qemu-img create -b Image1.qcow2 -f qcow2 Image1-DeltaFile.qcow2 Now I have an overlay called Image1-DeltaFile.qcow2. If I have another copy of Image1.qcow2 on a different ...
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2answers
45 views

Automatic VM disk resize

I got a KVM/Qemu setup that works great. Now I want to streamline the provisioning of new VMs. The two obvious ways are to either clone an existing disk or install from scratch (with an automated ...
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2answers
135 views

qemu don't start quest with disk image on tmpfs

I have 32bit windows 2k3r3 guest (terminal server) with 4GB guest ram and swapping. I created separate disk image for guest swapping and user's temp dirs. I have enouth RAM in host system and want ...
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1answer
336 views

How to fix a frozen qemu VM?

I have a qemu hypervisor on RHEL 6.4 that hosts VMs that will quite often lose their connection to the network. When the VM has lost its connection I can view and interact with the it using ...
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2answers
313 views

Can I run a KVM guest with a btrfs subvolume as file system?

I want to run a virtualized Debian stable KVM guest on a Debian stable host (to run untrusted stuff like Skype, Flash or eclipse with third-party plugins). Naturally host and guest will have many ...
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95 views

Qemu virtio-net extra networking interface

I have a qemu debian guest that is being launched with the following command. qemu-system-x86_64 -boot order=c -drive file=image.img,if=virtio -enable-kvm -netdev ...
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1answer
124 views

kvm/qemu via libvirt on CentOS - pass string or key/value or file to guest

I have a sizeable deployment of qemu/KVM VMs already, managed through libvirt. They're all CentOS 5 or 6 hosts and guests (the kernel lacks the 9p filesystem flags, so the "mount" shared filesystem ...
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1answer
82 views

virsh snapshot-create persistent through reboot/ domain destroy-start

If i take a snapshot of a qcow2 image backed domain via virsh snapshot-create domainID and I shutdown the machine (and probably destroy the domain if virsh list still shows it running), will that ...
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0answers
123 views

Why is qemu issuing a DHCP discover after it receives a DHCP offer

I'm having some trouble seting up network on qemu. I'm trying the easy option (user). The qemu command I run is this: ./qemu-xilinx/arm-softmmu/qemu-system-arm \ -M xilinx-zynq-a9 -m 1024 ...
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1answer
317 views

ESXi 5 doesn't recognize Raw disk image

I created a 60 GB raw disk using qemu-img convert, and qemu-img info confirms it is a raw file format. It worked fine in KVM. When I go in ESXi to create a new VM from existing virtual disk, and ...
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1answer
93 views

kvm - Recover domain from .img file alone

Yesterday I had a drive failure (raid-0) in the host system and had to re-install the os. Fortunately the vps images were on another raid array (raid-5) and the .img files are still available. However ...
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1answer
611 views

how to make bridge networking with KVM work in Fedora19

I'm attempting to get several virtual machines setup on a Fedora-19 host system, with the traditional bridge network devices (br0, br1, etc). I've done this many times before with older versions of ...
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1answer
158 views

Layer 2 bridged networking issue with QEmu

I am having a problem with a layer 2 bridged network configuration using Linux, QEmu, and VMware ESX. The configuration works fine on a small isolated network, but once introduced into our large ...
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1answer
882 views

qemu-system-x86_64w.exe : could not open disk image D:\img.img: Permission denied

I'm trying to use qemu on Windows (8), because I have to emulate an USB mass storage device (VirtualBox still doesn't handle USB3 which my computer only have .. and if I could have qemu working it ...
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69 views

Libvirt/Qemu - Host cannot receive guest multicast

I'm attempting to setup multicast communication between a host and multiple guests. The guests can both send and receive all multicast messages from any guest and the host. However, the host cannot ...
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1answer
43 views

qEmu doesn't save changes to virtual harddisk

I've installed qemu and AQEMU on my Ubuntu 13.04 from default repository. I created a virtual machine by using the wizard and set the harddisk to 10 GiB. I added a Debian 7.1 .iso file to the device ...
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1answer
172 views

KVM: Run a script when a guest is shutdown from within?

I am running KVM as virtualization engine. Is there a way to make QEMU/libvirt run a script on the host when a guest is shutdown from within (shutdown -h now)? I want to be able to run some custom ...
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1answer
202 views

Signaling KVM/QEMU VM to quiesce, preparing for live backup

Assume a KVM/QEMU VM, which uses qcow/qcow2 as the image format for virtual disks. Backup is (to be) done on the VM host. As far as my current understanding goes is that while we can create backups ...
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1answer
112 views

Kvm poor cpu performance

I have running some Minecraft Servers in a Qemu VM over Libvirt, and the performance is only half good than on real hardware. Libvirt started the vm over: /usr/bin/kvm -S -M pc-1.1 -cpu ...
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2answers
406 views

Issue with creating an Windows 2008 Virtualized image with qEmu

I'm trying to create a qemu image of a 64bit Windows 2008 Server install. It will be used on Openstack as an instance. The Virtualization environment [of qemu] is being run from a VMware virtual ...
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2answers
473 views

How to efficiently share host's folder with KVM guests?

I am configuring the service which stores plenty of files uploaded by nginx in /srv/storage dir on host system. These files are processed by worker KVM guests which may create new files or assign ...
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2answers
426 views

How safe is it to access qemu/kvm raw or qcow2 disk image files from host

I've read mixed opinions about how safe it is to modify qemu disk image files. There are two distinct situations I'm interested in. 1) let's take a raw or qcow2 disk image file not used by kvm (i.e. ...