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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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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). This little tutorial seems to do exactly what I want,…
red888
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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…
shim_
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Cannot access Qemu/KVM virtual using console, VNC, or SSH, or access via network (IP range no longer valid)

I have the host sitting here next to me, so you'd think I'd have decent control of the guest. I should add that I have already attempted various other means, such as mounting the drive, but I have found installing ndb-client to be nigh impossible…
Paul Cravey
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Making all Linux network interface (bridged) in a qemu VM use dhcp

I have a small application which takes in kernel code, and spins up VMs. I've been using this for kernel development. It is helpful and very fast when I want to spin up VMs with different kernel codes. The application uses qemu, and generates the…
Haris
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How to enable zstd for your qcow2 files

In QEMU 5.1 zstd compression of your qcow2 files was introduced but I can't find a way to activate it?
MrCalvin
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boot from cdrom !! kvm -machine pc-i440fx-2.1

I am trying to follow the instructions in the following article https://docs.j7k6.org/vmware-esxi-hetzner-install-kvm-linux/ I start the VM by the following command kvm -machine pc-i440fx-2.1 \ -cpu host \ -smp cpus=2 \ -m 4096 \ -hda…
Cloud-Lover
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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 <
Tobias Leupold
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