QEMU (short for "Quick EMUlator") is a free and open-source hosted hypervisor that performs hardware virtualization.

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How do I specify an alternative bridge interface (not br0) when using qemu-bridge-helper

By following the instructions found at http://wiki.qemu.org/Features/HelperNetworking I can configure qemu with qemu-bridge-helper, however, I can't figure out how to pass a bridging interface option ...
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Booting into linux kernel 4.1.3 using qemu

I am trying to boot into a compiled Linux 4.1.3 bzImage (disabled modules, so I only had to make bzImage). Correspondingly, I installed ubuntu 15.10 (with Upstart, not systemd) on a qemu cow2 image ...
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How can I store files in the mounted shared folder?

I am running a Fedora Workstation virtual machine on an Ubuntu host. I created a folder /home/cl/share in the guest and mounted the shared folder /media/cl/system/virtual/share as root following the ...
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How to debug a bash script in a qemu-arm chroot

I'm running a debian debootstrap script which creates an arm system. However, the script fails at some point and the error message does not really help. So I'll have to do some more debugging which is ...
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how qemu interacts with guest os io requests?

the Linux io stack (eg the path of an io request) is something like this: now when such a guest OS is a Linux distro in qemu, the path is the same except in this case there is no disk and scheme is ...
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Dive into qemu source code to trace io requests

I searched a lot about qemu and read its documentation but could not find any explaining its I/O stack. Specifically, I want to know about how an I/O request is created and what path it travels to ...
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16 views

QEMU kernel panic to serial port

I'm working with kernel 2.6.13.1 on Debian 6 with QEMU/KVM for a class. The kernel, once installed, panics on boot. The curses interface to qemu doesn't seem to allow scrollback to view the entire ...
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24 views

Qemu curses interface dimensions

I'm running a virtual machine from qemu with the -curses flag in order to view it over a slow ssh connection. Everything works well enough, but the terminal window that I have to interact with the ...
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Qemu error: internal error: QEMU / QMP failed: qemu-system-x86_64: PCI bus not available for hda

I get the error below when trying to start my vm with serenity ~ # virsh start winxp-gaming error:failed to start domain winxp-gaming error:internal error: QEMU/ QMP failed: qemu-system-x86_64: PCI ...
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Easiest *non-networking* method of communication between Linux host and Windows guest [closed]

I'm writing application software for Ubuntu which needs to communicate with another application running in a Windows Virtual Machine via Qemu on the same machine. I have full control over the source ...
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40 views

Can I enable cephx authentication using a pool in qemu/kvm?

(CentOS 7, Ceph Incunabulus, everything patched up to date) Background I've got a working converged Ceph/qemu/kvm cluster with cephx enabled for authentication. I'm trying to use this to store block ...
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Installing qemu-kvm 2.5 on Centos 7

Are there any repos out there that carry the most up-to-date version of qemu-kvm as well as dependencies? I ask because the newest qemu-system has a HUGE list of dependencies and I would like to not ...
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34 views

Linux Kernel is panicing on boot

After following this blog post I get a kernel panic when running: qemu-system-x86_64 -kernel bzImage -hda my.img -append=/dev/sda What could be causing this? Could I have left something out?
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36 views

Make synergy work between qemu host and guest

I have a working configuration of a Gentoo as a host and a Windows 10 as a guest using QEMU/KVM with GPU passthrough. I also passthrough my keyboard and mouse, and have a secondary keyboard in a ...
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26 views

How to disable QEMU guest access to host ports

I'm using the following command to run a QEMU VM: qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -hda disk.qcow2 By default, the guest OS has internet access, but can also access open ports on the ...
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44 views

Category of QEMU

I am a beginner of learning architecture of VM. Some questions cannot find clearly through the internet. There are two kinds of VMM(Virtual Machine Monitor) accord to their virtualization level, ...
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Problem with xv6 on qemu

I was doing the assignment on this link --> http://zoo.cs.yale.edu/classes/cs422/2013/lec/l2-hw After running make qemu the assignment document says A separate window should appear ...
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1answer
230 views

Qemu USB passthrough (windows guest)

I have a USB ADC/DAC and a HASP protected proprietary data acquisition system for it, both of which do not work in linux. I am trying to make it work in Windows virtual machine using qemu. Here are ...
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29 views

Virt-manager Permission Denied when accessing NFS pool

I'm currently having this error when I'm trying to install a Virtual Machine on my NFS share. i've added my NFS share (coming from FreeNAS) to a Storage Pool on the virt-manager Another issue is ...
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43 views

/dev/kvm is missing from system supporting kvm-virtualization

I'm trying to enable kvm-virtualization for Android virtual devices. In order to do so, I followed this guide and did the following: Checked, if kvm-virtualization is available: user $ grep --color ...
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76 views

Running QEMU inside XEN virtual machine

Is it possible to run QEMU inside XEN virtual machine? I tried to enable the XEN nested virtualization for with following options to virtual machine configuration file in /etc/xen/vm1.cfg: hap=1 ...
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Debian 8 install in QEMU/KVM guest failing due to ext4-fs / “read only filesystem” errors

I am on Debian 8.2 and trying to install a Debian 8.2 QEMU/KVM guest. I created a virtual disk image file and booted into the Debian installer ISO with the following commands: jesse@deb:~/vms$ ...
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34 views

Bridged interfaces do not have internet access

I'm trying to run a QEMU VM but it doesn't have an internet access, only access to the host and a Docker network. What I did: Created a bridge with: brctl addbr virbr0; Turned it on: ip link set up ...
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Installing qemu-user-static and binfmt-support inside an LXC

I'd like to run armhf executables inside an amd64 LXC container. How to do that? update-binfmts --display shows no qemu interpreters.
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linux kernel-4.3 and sda disk image

I have cross compiled the linux kernel-4.3 for arm and created ext2 disk image. I have copied the rootfs into disk image. I have tested the disk image with cross compiled kernel version 2.6.33.2 on ...
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49 views

How to run a gui client os in a virtual machine on non gui linux host?

Is it possible to run a windows gui client in a virtual machine hosted in a non gui linux? How to set this up? and how to connect to such a machine?
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46 views

KVM - nat or bridge. How I do that

I have Debian Jessie server, and I have install apache server. From apache hosted several sites from different ip address. My server have resources for KVM. My question is - How I can set my free IP ...
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HOWTO: Fix “Cannot parse sensitivity level in s0” error when attempting to start a KVM VM after a major OS upgrade

I have a Lenovo ThinkPad T430 running Red Hat Enterprise Linux 6.7 with kernel 2.6.32-573.8.1.el6.x86_64. This is a work computer, corporate policy states that I must keep my operating system up to ...
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240 views

Why can't the kernel run init?

I've downloaded the Raspbian image on this page. I'm trying to compile a kernel that can be used to boot the image within qemu. I downloaded the Linux kernel source from kernel.org and ran: make ...
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129 views

Making /dev/net/tun available to qemu?

I have created a tap device (tap0) which I would like to provide as a network interface to qemu. I created the device with the following command and attached it to a network bridge I set up: tunctl ...
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45 views

Encrypt partition and allow qemu to use it as the guest drive

I am trying to encrypt a 25gb partition on my SSD with cryptsetup in such a way that will allow QEMU-KVM to use it as the guests drive. I have tried luksformatting the drive: cryptsetup luksFormat ...
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Problems with overall ceph performance with QEMU

I am experiencing some performance problems with my QEMU KVMs on my ceph cluster. The cluster has 4 nodes with 4x1TB drives each, 48/64GB RAM, Intel Xeon and AMD Opterons. They are interconnected by ...
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151 views

qemu with kvm guest OS is slow

I am trying to create a Windows 7 virtual machine on a Gentoo x86_64 host (kernel 3.18.9 hardened) using qemu-system-x86_64 2.3.0 with kvm enabled. I have successfully compiled the kernel and have ...
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1answer
28 views

qemu command to start an iso and include a file.img as hard drive

i'm currently using debian jessie , and i can't find qemu launcher in its repositories . however i wanted to know how to start or boot an iso image and inclure a raw file (file.img ; created ...
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Golden image updates in qemu

Consider that there are 100 windows virtual machines coming from a single base image and each vm is added to domain along with minor other machine specific settings which can be done by a script. ...
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ISC DHCP Server - Qemu system

I've been trying to get dhcp address by an ISC Server. I have one DHCP Server and one qemu server with multiple image tiny core. Hopefully this ascii drawing illustrates the topology: Over the qemu ...
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1answer
80 views

Virtfs (Plan 9) vs NFS as tool for share folder for virtual machine

I have QEMU virtual machine. Linux host and linux guest. I want stable and fast solution with minimal performance cost. I'm considering two technologies for shared folders (between guest and host): ...
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78 views

Virtualisation: follow symbolic links in VirtFS (9p) share

I have folder on host machine which have symlinks to another device. Like this $ ls -all ~/folder_to_share ... file1 file2 linked_dir -> /mnt/bdrive/real_dir/ ... I setup QEMU virtual machine ...
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Pre-built Linux kernel with CONFIG_AEABI for Raspberry Pi emulation in qemu

I'm trying to run a RaspberryPi emulation on QEMU following the instructions from: http://cubik-tech.blogspot.com/2013/02/raspberry-pi-emulation-on-windows.html (and many similar posts) But I'm ...
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1answer
33 views

Disk space in windows not representing actual qcow2 image size

The disk space shown in Windows running in KVM does not represent the actual disk space available for the qcow2 disk image. The Windows Management Console shows there is 100 GB for the drive, but ...
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186 views

logging and debugging for qemu virtual machines

I had a qemu virtual-machine which crashed several times because HDD in hypervisor had no space left. This made me wonder is there a possibility to to set up a logging/debugging for quemu ...
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1answer
49 views

Qemu - debug new syscall

as a school project I have to add a syscall to the latest stable linux kernel. I did and recompiled the kernel using make defconfig and make. After going through several tutorials to boot the kernel ...
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1answer
380 views

Libvirt: how to pass qemu command line args?

I have the current libvirt 1.2.20 i want to pass to my machine create with virt-manager some qemu flags. I edited the file and add </devices> <qemu:commandline> <qemu:arg ...
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Use case for qemu-static for same architecture

I just discovered that the 64bit amd version of the Ubuntu package qemu-user-static contains the binary /usr/bin/qemu-x86_64-static. Normally, qemu-user-static is used for emulating another ...
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467 views

not syncing: Attempted to kill init! in custom kernel for qemu

I have been working on building a linux kernel for qemu. I have been following the tutorial http://xecdesign.com/compiling-a-kernel/ As of now i have been able to boot the kernel until start of init ...
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66 views

Unreliable QEMU guest agent responses

I have a script for automatic backups of my KVMs. Before taking a LVM snapshot I'm trying to freeze the filesystems of the KVM with the QEMU guest agent. It works good most of the time but randomly I ...
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53 views

Qemu - substitute the init process

I have a couple of questions concerning qemu boot options 1) When using the following argument init=/bin/sh It works - but is really the init-process replaced by a sh-process? Qemu-system-x86_64 ...
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spice-client full window

installing spice-client gives me 3 client options for connecting to qemu machines: spicec (small and ~perfect test-program but shift-F12 release cursor won't work) spicy (more useful options but can ...
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2answers
317 views

Are there any benefits of using .qcow2 over .img and which is recommended for making a VM? [closed]

Are there any benefits of using .qcow2 over .img files when trying to create a VM . I have a smallish debian .iso and have seen at least with .qcow2 that it is slow. I also saw ...
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How to run Windows with GPU virtualization?

A year ago I switched to Ubuntu for my primary OS, which has worked out just fine. Every now and then I want to play computer games and while using Wine often works, I can't get all of the games that ...