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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2k 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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570 views

QEMU USB passthrough is not working

I stuck at getting USB passthrough working with Windows 8.1 guest OS on Ubuntu Server 14.04. I started by installing qemu using the Ubuntu Documentation (https://help.ubuntu.com/community/KVM). The ...
2
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331 views

qemu-img VHD to raw image convert results in bad geometry:

Is anyone else able to reproduce this? Using StarWind V2V Image Converter on Windows, I'm able to get a valid disk.img file, so the source image.vhd is clean (pulled down from rackspace). Is this a ...
2
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290 views

Force libvirt to pass always the same device number to the guest on USB device reconnection

I have a HP plotter connected with a USB cable to a debian server through a USB hub. On the server there is a virtualized Windows XP. Everytime I reboot the plotter a different device number is ...
2
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183 views

LibVirt (QEMU) Shutting down from inside guest

I am currently running LibVirt with Qemu on Debian Wheezy: Versions: libvirtd (libvirt) 1.2.4 qemu-x86_64 version 2.0.0 (Debian 2.0.0+dfsg-4~bpo70+1), Copyright (c) 2003-2008 Fabrice Bellard It's ...
2
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274 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 -...
2
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0answers
6k views

VNC faster than Spice for remote access to KVM guest?

Having used RDP before, I'm not exactly thrilled with the performance I am seeing from VNC to my KVM virtual machines. The KVM host is Ubuntu 12.04 server x64. I've read that Spice is faster, and ...
2
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1k views

virtualbox to qemu but results in no bootable device qemu

I use vagrant to create my development vm. I exported the vmdk to vdi, and then convert the vdi to img. cd virtualbox_dir/test_vm VBoxManage clonehd test_vm.vmdk raw.vdi 0% ..... 100% qemu-img ...
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46 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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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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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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102 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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0answers
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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0answers
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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0answers
90 views

How to prevent conntrack overflow on host with many qemu guests

Is there any way to make iptables conntrack use separate data structures for each network interface? Would network namespaces help here (put each guest together with its tap device in its own netns ...
1
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0answers
116 views

Set custom cpu string for qemu/kvm

I have some virtual machines with software, which licensing check depends on cpu string. They're running on kvm - with default cpu string value - which is QEMU Virtual CPU version 1.7.1 After ...
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120 views

libvirt hook qemu suse12

we have this qemu hook. In suse 11 was working well but in suse 12 it is not working. The hook is setting the ports in openvswitch native-untagged. Do you know if there is some libvirt missing ...
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196 views

Why are Windows XP and 7 qemu/kvm guests not recognizing updates to a local Samba share?

I develop cross-platform software and test the Windows ports with wine, Windows XP, and Windows 7, the latter two tested using qemu with KVM. I also have several versions of OS X and Debian Wheezy as ...
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844 views

virt-install fully automated install

I'm looking into ways of installing/deploying a VM completely automated (no user interaction). So far I have tried QEMU and virt-install along with QEMU. The issue with qemu is that injecting ...
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121 views

Why ssh tunnel cannot create in the virtualbox or qemu with force mode (-f)?

I try on the dedicated server root@debian:~# strace -e open -f sshpass -p guest ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null guest@198.51.100.11 -C -N -D 127.0.0.1:22220 -f [pid ...
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414 views

libvirt / kvm guests take very long time to start after host reboot

Host system is CentOS 6.5 x86_64. I have setup an Ubuntu guest by following this wiki. The guest works, but: if I reboot the host, it takes a very long time (about 30 minutes on the last reboot) ...
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423 views

Enable SDL for KVM under CentOS 7

I'm trying to set up a VM in CentOS 7 with an SDL display, but every time I try to run it, I get the following error: Error starting domain: internal error: process exited while connecting to monitor:...
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494 views

qemu/kvm: connect two machines via ttyS0

I would like to connect two machines via ttyS0 Here's what I did on the guest machines: A: Add to /etc/inittab: S0:2345:respawn:/sbin/mingetty ttyS0 Add to /etc/securetty: ttyS0 B: Try to ...
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89 views

virt-rescue for Ubuntu

I want to install virt-rescue on Ubuntu 11.10 or Ubuntu 10.04. It could not be found in the repositories. Where can I get it?
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35 views

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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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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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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49 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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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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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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100 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 ...
0
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0answers
54 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 ...
0
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0answers
17 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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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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41 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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0answers
24 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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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!
0
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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 ...
0
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0answers
218 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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0answers
32 views

Qemu - Reduce virtual disk size

I have a problem trying to reduce a virtual machine's disk. The host is CentOS 6.5 and the guest is Windows XP. The size of the virtual drive is 250GB, but I want it smaller. How can I do that? ...
0
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0answers
148 views

Soft Lockup - CPU Stuck qemu-system-x86

I have a system running: * openstack icehouse * Linux 3.13.0-48-generic #80-Ubuntu SMP Thu Mar 12 11:16:15 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux(Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16) Suddenly ...
0
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0answers
118 views

Qemu Virtual machine very slow

This is my first time using Qemu, and creating my own virtual machine. I feel like a complete newb ;( Debian Linux host Uname -a: Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u5 (2015-10-09) ...
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21 views

KVM - Reassembly of packets done by virtual bridge interfaces

I've 2 guest OSs in KVM based setup, talking to each other using a virtual bridge(VBR) Client--Device1--(VNET1)----VBR----(VNET2)Device2--- Server I see that the packets are getting fragmented by ...
0
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0answers
121 views

Use host's VGA output from virtual machine

Is there a way to stop a host OS from using its VGA port (on the motherboard) and allow a VM to use it instead with KVM-QEMU? I have read about VGA pass-through, but all the discussion I've found on ...
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0answers
184 views

Running a virtual machine remotely; connect it to the local network

The scenario is as follows: I have a virtual machine remotely, e.g. on a server somewhere in a data center, and I connect to it from my laptop on a restricted network (only tcp 80 and 443 are open). ...
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760 views

Backup KVM running machine safely

I read some solutions to make backups of running VMs, but all take offline snapshots that seems difficult that will work if the VM has high I/O load. I have tested but i have doubts about the process ...
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0answers
138 views

QEMU stop/continue memory releasing

When using qemu-monitor console, i do PAUSE / CONTINUE of different VMs with stop/cont commands, which works ok, and my main CPU usage stays low. Is it possible to keep memory usage low this or ...
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730 views

KVM does not boot with .iso disk images. Device or resource busy?

I've been trying to set up a windows VM on my Ubuntu box by following the linked blog post http://www.pugetsystems.com/labs/articles/Multiheaded-NVIDIA-Gaming-using-Ubuntu-14-04-KVM-585/ So I have ...
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3k views

Gnome Boxes on CentOS 7 with Windows 7 as a guest

I just installed CentOS 7 and tried to use Gnome Boxes to create some virtual machines. As long as I stick to other Linux distributions everything is fine. But I really do have trouble installing ...
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455 views

What could cause linux to reboot even though panic is not set

Bit of context. Few VM's running on KVM (SmartOS), using kernel 2.6.32.7 have been rebooting. Nothing in the Qemu/KVM logs to suggest it's a Qemu issue. Unfortunately while testing kdump i discovered ...