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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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Centos 8.2 KVM Windows Server 2019 Blue Screen

EDIT 11.07.2020 I prepared a custom vhd via virtualbox. It has the same bluescreen, but now I'm getting into cmd. mdsched worked fine -> So no memory issue... Informations: HP Proliant 380 G9 QEMU emulator version 2.12.0…
Wulf
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Qemu Libvirt : unabled to pass all GPUs to vms

Im trying to pass all gpus to different systems , my setup: asus x399 gaming 6 mainboard amd 1950x 32G ram 1 TB intel ssd m.2 gtx970 gtx750 this resources should be passed into 3 systems: vm1 a windows 10 VM with the gtx 970 vm2 a Ubuntu VM with…
Basur
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Assigning proper vlan id tag to a QEMU-KVM Centos 7 virtual machine

I have a Centos 7 QEMU-KVM virtual machine located at a Centos 7 physical server. Both are in a network that uses vlan ids. Also the Network Admin Guy told me to assign the VLanId 33 to the Virtual machine. Because of this, the virtual machine can…
Jose Cabrera Zuniga
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Libvirt: "The CPU is incompatible with host CPU"

I'm exporting a domain from 'old pc' to 'new pc' # Export domain (from old pc) ssh user@"$REMOTE_IP" "virsh --connect qemu:///system suspend --domain magento-base > /dev/null 2>&1" …
Adrian Lopez
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"chroot", but with a VM?

I just backed up a remote system using rsync. I have a directory that I can chroot into and would now like to boot it up as a VM. I know that qemu has -kernel capability, as well as -drive file=fat: virtual FAT feature. I was hoping that maybe with…
d33tah
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VM client doesn't route packages correctly anymore (to specific networks)

I have kind of a strange problem. After rebooting a server a few days ago, it doesn't route its packages correctly. It basically doesn't answer (pings for example) if these packages come from specific networks. It's a virtual machine (Qemu, KVM,…
FireLlama
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What is the role of QEMU in server virtualisation?

I am aware of that KVM provides hardware acceleration feature by utilises the virtualisation extension in CPU chips like Intel VT. So that VCPUs can be directly mapped to physical CPUs to achieve almost native speed. Since Linux kernel includes the…
TheFirefly
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qemu-system_x86-64 can you add a physical hard disk to a virtual machine without being root

As it is on the title I want to add a physical partition to my VM without having root privilege. Is it possible from Linux and how should I do this by using only qemu-system_x86-64 ??
xala
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Error: "you need at least 8.6GB disk space to install SecurityOnion, This computer has only 2 GB"

required disk size is more than 8GB But got only 2GB In GNS3 I imported securityonion-16.04.6.1.iso image as new qemu vm, not as existing qemu vm. These is no where an option to change/choose enough disk size, the only option I got is to select RAM…
reddi hari
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unable to ssh into local qemu instance via port forward

I am trying to build a custom Ubuntu (ISO built from bionic - 18.04.2) qcow2 image via packer. This fails in the step where packer tries to SSH to the instance via port forward. I can see from VNC that the instance spins up fine, and I can login…
Ani
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qemu-system-x64_86 high CPU comsumption, much higher than the processes inside the guest

I have an Ubuntu 18.04 with several virtual machines running in it using kvm. Using top inside the VM it never goes CPU consumption over 30%, however, if I check the qemu-system-x86_64 processes in the host I usually have over 100%. Why is this…
jicarretero
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qemu - second network interface to openvpn tap

I have a debian-linux host running a windows vm with qemu. As network setup I have one eno1 interface which connects the linux host to the internet, an tap_inet for qemu for internet access and on bridge br_inet linking those two. With this setup…
Beny Benz
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how libvirt cputune config goes to qemu-kvm

I am porting xml libvirt config to qemu executable arguments. Simply I have .xml vm config from virsh edit vm-name and I want to run the same vm machine by executing qemu-system-x86_64 with special command line parameters. Die to my specific needs I…
Andrey
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Cant find much documentation regarding over committing of memory for VM's on a KVM host

Most operating systems do not use 100% of the available RAM all the time, having said that I am unable to find an approximation for this over provisioning. CPU cores is not a constraint for me, I have a 64 GB KVM host, I would like to provision…
Anees Patel
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May the qemu running just a program not need a full system?

I'm doing some tests but I'd had some problems using WINE as tool. I used to use qemu to make my test but running a clomplet sistem. But what I need now is just run a ordinary program. What I want know if is possible use qemu to just run a singular…
Kalil
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