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Questions tagged [qemu]

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.

QEMU has two operating modes:

  • User mode emulation

In this mode QEMU runs single Linux or Darwin/Mac OS X programs that were compiled for a different CPU. System calls are thunked for endianness and for 32/64 bit mismatches. Fast cross-compilation and cross-debugging are the main targets for user-mode emulation.

  • Computer emulation

In this mode QEMU emulates a full computer system, including peripherals. It can be used to provide virtual hosting of several virtual computers on a single computer. QEMU can boot many guest operating systems, including Linux, Solaris, Microsoft Windows, DOS, and BSD 1; it supports emulating several hardware platforms, including x86, x86-64, ARM, Alpha, ETRAX CRIS, MIPS, MicroBlaze, PowerPC and SPARC.

Source: wikipedia

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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 some serious problems getting the network to work…
Tom O'Connor
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kvm/libvirt backup: how to ensure a consistent fs during online blockcommit?

I want to create online backups of a KVM Windows 10 virtual machine that is managed by libvirt. I have the qemu agent setup in the guest. If found this wiki entry that suggests the following: 1. create an offline snapshot $ virsh snapshot-create-as…
muffel
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Delayed start for Guests KVM/libvirt

Looking for any pointers anyone may have to introduce a delayed start for KVM guests i.e. 30 seconds between starting each virtual server rather than starting them all at once which thrashes the disks and actually just ends up taking a lot longer to…
Backtogeek
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Permission denied error when launching instance ("Could not open backing file")

Working with OpenStack, installed from packages available on Debian testing (buster). When I try to launch an instance, it fails after building with this message in nova-compute.log: Could not open backing file: Could not open…
d3query
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How do I use qemu-bridge-helper to get a virtual server running on my local network?

I would like to access my virtual server from anywhere on my local network. I'd prefer to use qemu-bridge-helper so as to simplify the networking, since i'm weak in that area. After reading the Arch wiki, attempting to comprehend the Gentoo wiki,…
Noob Saibot
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Booting from firmware-based PCI RAID controller in SeaBIOS

I had a server running Windows 2003 that resided on a RAID5 array formed by Promise FastTrak SX4100, which I thought was hardware-based because of its dedicated processor and buffer memory and its ability to boot DOS and Windows. As it turns out,…
Anton Samsonov
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enabling virtualization on supermicro board

I'm trying to setup a virtualization server on an old Supermicro board (mainly for experimenting a bit), using qemu/kvm (running on Debian/jessie, with a 3.16.0-4-amd64 kernel) The board is equipped with Intel Xeon CPUs, and as I understand it they…
umläute
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Is there a way (non network-based) to share host (ubuntu) file system with guest (centos 7) using libvirt?

I am trying to use virsh and domain xml to launch a Centos 7 guest from ubuntu 16.04 LTS host. The "filesystem" node that i am using in domain xml is as below:
Swaru
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How to enable DHCP for "br0" device for qemu?

I've created a Windows XP image and I'm booting it with qemu. I'm using qemu-bridge-helper to to setup networking. Following qemu totorials, I've configured /etc/qemu/bridge.conf to allow br0 bridge device. This is how I boot Windows XP with…
Boda Cydo
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Qemu packer ssh failed connection reset by peer

I am trying to get packer to create a qemu/kvm image. I feel like it should be fairly straightforward but my build keeps failing on ssh. Here are the relevant files template.json: { "builders": [ { "type": "qemu", "iso_url":…
C413
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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 the win7 guest even though taskmanager inside the…
Hans Böhm
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KVM port binding

I followed this tutorial to install a KVM virtual machine on my ubuntu server. Now i need to bind a port from the guest to the host. I tried several tutorial to bind the port, but nothing worked. My setup is: Host: Ubuntu 14.04, IP: 192.168.122.1…
Matthias
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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 please? Thanks in advance! I'm also new to Linux…
dallasclark
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Best options for KVM/qemu/libvirt VM migrations without shared storage

My team has recently been tasked with improving the virtualization infrastructure at the company and one thing we're looking into doing is speeding up migrations. We use local storage only on all VM Hosts. One challenge is that we have thousands…
seajoshc
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Qemu+libvirt+kvm significant performance lag in VM's

I am troubleshooting poor performance on our new VM host machine which is a Dell PowerEdge R415 with hardware RAID. We've got about 20 VM's running like this: qemu-system-x86_64 \ -enable-kvm \ -name rc.stb.mezzanine -S \ -machine…
T.K.
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