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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libvirt IPv6 Guest can't connect outside of the Host

i am trying to get a address from my IPv6-Subnet working in a Virtual Machine(libvirt, qemu). IPv4 over nat works like a charm. The host is a Debian 8.5 with qemu 1.2.9 and a 4.6.3-1~bpo8+1 (2016-07-...
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60 views

Kernel panic - not syncing: Attempted to kill init ( using qemu for a Rasbian ARM image) [closed]

I am using qemu 2.6.0 on my ubuntu 14.04 x86_64 PC. I want to emulate rasbian -- A Linux destro based on ARM Debian for Raspberry Pi. Here's the settings when using qemu /usr/local/src/qemu-2.6.0/...
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1answer
135 views

icmp ping reply not received by ping process, seen by tcpdump/wireshark

I'm having an issue with getting the actual ping process to receive the reply even though I can clearly see the response in the tcpdump output. I'm running on: Mac OS X 10.11.4 El Capitan Bridge ...
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19 views

Run same virtual machine twice simultaneously from the same base snapshot

I would like to have a base snapshot and then launch several virtual machines from it simultaneously. These machines have a short lifetime and then shutdown, there is no need to save the changed to ...
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1answer
16 views

Trying to understand the discrepancies in disk usage inside raw images and on host disk usage

As the title states, I am trying to understand the discrepancies from ncdu and/or du in terms of what I am observing from disk usage. From what I understand, on modern systems, there is difference ...
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29 views

virt-install fails when binding to spice socket

I'm trying to set up a Windows 2008 server virtual machine on CentOS 7 with virt-install. I currently have two linux containers running without issue. The command I'm running to set up the VM is virt-...
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45 views

qemu-kvm VM hangs at iowait with virtio drive

We are seeing instances of a VM hanging with the following symptoms: load average 800, processes stuck, CPU 100% in iowait reading files work, writing files hang the system RAM utilization is high, ...
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1answer
20 views

mount a kvm qcow2 file

so i have a kvm image that i'm trying to mount: [0c79dafb-abb7-4714-9a0a-4e16f0b305e7]# tree . ├── console.log ├── disk ├── disk.info └── libvirt.xml [0c79dafb-abb7-4714-9a0a-4e16f0b305e7]# qemu-img ...
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17 views

QEMU image format

I have an image with .qemu format. I looked here to see QEMU supported formats but there is no .qemu. Is.qemu equal to raw? Thanks
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48 views

virsh, how to get full screen resolution via VNC

I've got a few KVM VMs running on my home server, some of them running X. I use virsh to manage them, and tunnel 5900x ports via SSH to access them via VNC. I can't get the resolution to go higher ...
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1answer
65 views

boot issues after converting running linux to vm manually

I did a file copy of a running debian8 installation to a image. Following is the proceedure. create a vdisk image - raw / vdi. mount it locally. do a file wise copy of a running linux distro: ...
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16 views

Can't connect to virsh managed QEMU-KVM via network interface

trying to connect via SSH to VM on Debian 8.4 Host. Seems the virtual ethernet adapter don't get an IP4 by DHCP. Can smb. point me in the right direction :( Some cfg. details... #ifconfig eth0 ...
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1answer
19 views

qemu-img: by accident decreased disk size

I decreased my KVM disk image by accident from 100G to 50G using: sudo qemu-img resize disk.raw 50G I wanted to increase the disk from 100G to 250G. Now the VM is not booting :( And get this ...
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1answer
28 views

libvirt kvm qemu virtual machine - hard code domain-id?

Is there a way to hard code the domain-id of a virtual machine kvm guest? I tried adding an id attribute to the XML configuration via virsh edit name And I also tried to edit the XML directly ...
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58 views

Qemu kvm necessary kernel and qemu version on jessie host and guests with Skylake

I am running a dedicated server with Debian jessie and the current backported linux-image-amd64/linux-headers-amd64 (currently 4.5), because the server has a Skylake CPU. On the dedicated root, I'm ...
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0answers
36 views

Gentoo virt-manager IO throttling

I have a problem with virt-manager (or qemu/libvirt) installed on gentoo. Here is My virt-manager installed on Debian Jessie: There I have IO throttling but not on my Gentoo: I tried to search ...
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99 views

How to boot livecd linux distro under kvm virtualization with virt-install or virsh?

I am trying spin up a small livecd linux distro with virt-install under KVM and got access to it via virsh console. And I am kinda loss with --location, --livecd and --cdrom parameters. How should I ...
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1answer
42 views

QCOW2 virtual size lowering

I'm trying to get the virtual size of a qcow2 container down so that it can fit in a openstack flavor with 10GB disk. root@node-10:~# qemu-img info zztop.qcow image: zztop.qcow file format: qcow2 ...
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1answer
62 views

KVM/QEMU: “Storage parameter error: directory is not managed on the remote host” when importing an existing image from a mounted drive

A server I manage remotely has a KVM/QEMU image stored on a non-os, mounted drive /mnt/drive. When I use virt-manager to import the disk image, I get the following error: Storage parameter error. ...
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53 views

KVM/QEMU Connecting guests only to other guests

Heyho guys, I have one host machine with multiple VMs on it. Their gateway is the host machine (which is doing some NAT etc.). There's one bridge at the host machine and a default virtual network ...
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16 views

Errors after unmounting qcow2 image with LVM

I successfully mounted a qcow2 image on my machine (the guest image uses LVM) using: qemu-nbd -c /dev/nbd0 /path/to/qcow2/file mount -o rw /dev/nbd0p1 /mnt/<mountpoint> vgchange -ay VolGroup ...
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1answer
110 views

How to forward a port from guest to host in qemu (kvm)

Is it possible, and how, to forward a port from guest to host in qemu/kvm? Note do I mean (out of) from guest to host, and not from host into guest (that's widely documented). I think I'm looking ...
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1answer
74 views

QEMU, Virsh and SMBIOS tables edit

I am currently running qemu-kvm on an Ubuntu server box and I use libvirt with Virsh to create, manage, start and stop VMs. I edited VM's XML configuration through virsh edit command to change CPU ...
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25 views

How to configure libvirt to allow console access

I was able to run a Raspbian image with libvirt using this XML configuration file. I can SSH into the VM just fine, but when viewing the "console" with the virt-manager GUI, I never get a login ...
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40 views

How to install Ubuntu ARM image with virt-install

How do you use virt-install to create an ARM virtual machine for running an Ubuntu ARM Raspberry Pi image? The docs are unclear to me, but from reading the manpage and looking at several examples, I ...
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23 views

How to make live snapshot in qemu?

I have two live qemu virtual-machines with KVM support(-enable-kvm) in daemonized mode(-daemonize). I don't use libvirt. One of those virtual-machines use virtual HDD in qcow2 file-format and another ...
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1answer
264 views

Difference between qemu-kvm, qemu-system-x86_64, qemu-x86_64

For new features, I recently updated qemu-kvm 1.5.3 to qemu 2.5.0, but I saw several qemu binaries, /usr/local/bin/qemu-x86_64 and /usr/local/bin/qemu-system-x86_64. It seems qemu-system-x86_64 is the ...
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2k views

Using NAT in qemu

I have used Qemu to install a windows xp guest. The command I run is qemu -m 2048 -gda winxp64.img \ -boot d -usbdevice tablet \ -enable-kvm -vnc :10 \ -netdev user,id=network0 -device ...
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1answer
54 views

qemu-img: Could not open '/dev/stdin': Could not refresh total sector count: Operation not permitted

I want to transfer block device contents over the network directly into a qcow2 image. I started with a small simulation: [root@okvmh1 default]# dd if=/dev/zero bs=1M count=100 | qemu-img convert -p -...
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64 views

virsh qemu kvm editing xml has no effect

When I try to add a network section to a kvm/qemu xml, the xml wont update with the information. When I edit the uuid, or make a mistake, i get an error. if i change the memory amount, it reverts to ...
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9 views

libvirt-Can I use 'virsh save' this command only get 'vm physical memory'?

I use 'virsh save ' to create an image,but I only want to get 'vm physical memory'.I don't know how to do it now.If you know the answer please tell me.Thanks!
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1answer
26 views

Modifying qemu without screwing up my current install

I currently have kvm installed on my Debian laptop: kvm --version QEMU emulator version 2.1.2 (Debian 1:2.1+dfsg-12+deb8u5a), I want to modify it to supported nested virtualization (ESXi VMs). ...
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1answer
76 views

Proxmox-Server reboots sporadically

I just mentioned that my proxmox-system is rebooting from time to time when performing backup-tasks (bacula, not the proxmox-backup-system). The logs are showing the following: Mar 8 02:30:01 ...
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1answer
197 views

What are the steps to export a VM from KVM to ESXi?

I want to be able to export a KVM based VM to an ESXi 5.1/5.5 host. My current methods ends up with the VM not being able to boot on the ESXi host. (I have tried importing the same .ova on VirtualBox ...
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1answer
138 views

Serial communication between QEMU host and guest

I'm trying to set up a pair of serial ports between my QEMU host (Debian Jessie x86_64) and guest (also Debian Jessie, but on ARM). Everything except the serial port part works. I'm really new to ...
2
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1answer
348 views

KVM / QEMU: connect to VM without GUI [closed]

Short Version (Solution is below): I have a Windows PC. I have a Debian server (without desktop environment). I have a Ubuntu VM running on Debian server via KVM/QEMU. Question: How can I connect to ...
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100 views

Libvirt & USB Hub Passthrough

I have a virtual machine which I wish to have a USB Hub and all of its devices allocated to a virtual machine. The Hub in question is a USB hub which itself is plugged into one of the ports on the ...
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50 views

KVM is there a way to map physical memory to host. Like Xen mapping to Dom0

Been looking for an answer to this for a while. I am switching over from Xen virtualisation to KVM, and have been reading about KVM's ability to overcommit memory. I was wondering if anyone can help ...
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2answers
288 views

Installing VirtIO SCSI on Windows Guest fails

I'm running Windows 10 as guest via KVM / qemu. Unfortunately, Windows doesn't recognize the fedora virtio drivers I want to install for better HDD perfomance. The driver itself does show up, but ...
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1answer
72 views

How to create virtual networks by using libvirt?

I have installed qemu/kvm and have tried to create some virtual machines and network them together. What I would like to achieve is 2-3 virtual machines in their own private network (e.g. 10.0.0.0/24)...
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48 views

How does Qemu handle memory?

I'm having a real hard time understanding something and I was wondering if anybody has any experience with this and is able to help. I have two KVM VMHosts, one running qemu 2.4.1 and the other ...
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1answer
130 views

Correct virtio setup on Ubuntu 14.04 64-bit host

At the present moment, my guest is running inside qemu and host is kvm intel, running Ubuntu 14.04, kernel is 4.3.0 stable. From within the guest, when I run "hdparm -i /dev/sdb" on the guest, I get:...
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1answer
177 views

Ubuntu + bridge +qemu + tap + virtio dropping packets

I've got what I think is the standard qemu bridge/ubuntu tap interfaces set up running variety of VMs on my Ubuntu host. All the VMs I'm having trouble with are Windows images. I have researched this ...
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1answer
29 views

Is a QEMU installation on a raw disk backward compatible?

I create a qemu image like this: qemu-img create -f raw my_disk.raw 2G and (manually) install debian into it: qemu-system-i386 my_disk.raw -enable-kvm -m 1024 -cdrom my_debian_cd.iso Say I do ...
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216 views

FreeBSD 10 guest on qemu/kvm CentOS 7 host

I'm trying to install FreeBSD 10 on CentOS host without using graphics (using only serial console). I've tried: # virt-install -n freebsd-a -r 512 --vcpus=1 --os-variant=freebsd10.0 --graphics none -...
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2answers
529 views

KVM top shows high CPU load on host for windows7 guest though windows is on idle

we have an virtualization environment with actually 4 VMs (2 x linux, 1 x w2k3, 1 x win7). In the host system (Debian Jessie) top always shows a CPU load of 30-70% (or more) for the qemu process of ...
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2answers
274 views

KVM: Need multiple Virtual Machines to share a VLAN'ed interface

I'm not sure how to configure my Linux server which has a single VLAN'ed interface to support a number of Virtual machines which I want to bridge to my network (so that all their services appear to ...
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203 views

Proxmox/KVM: Can not clone VM

I would like to create a clone of a KVM machine - yesterday I was able to create a clone of the same machine within some minutes. Now it takes hours and is still stuck an "0%": create full clone of ...
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1answer
32 views

Files left over after removing KVM guest

Looking at this post I ran the following commands to remove a VM: sudo rm /var/lib/libvirt/images/centos01.qcow2 sudo virsh undefine centos01 --managed-save --snapshots-metadata But it looks like I ...
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1answer
1k views

WARNING KVM acceleration not available, using 'qemu'

Running debian (Linux Rick 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u6 (2015-11-09) x86_64 GNU/Linux) Looking at my cpuinfo I can see I have vmx support: flags: fpu vme de pse tsc msr pae mce ...