Questions tagged [qemu]

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

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Error in installing the Qemu package

I would like to install Qemu in my Virtual machine Debian 9, but I unable to do it. It would be helpful if someone can solve this issue. The vdi file for Debian 9 is provided by my company. root@...
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Shared folder between QEMU Windows guest and Linux host with virtio-fs

In QEMU 5.0 and kernel 5.4. Virtio-FS(D) was introduced for better access to shared folder on Linux host. It seems guests access the shared folder using something like FUSE technology. I found a ...
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Debian KVM guest unbootable after mkinitramfs - mounting /dev/vda1 on /root failed

07/07/20 Edited: added info regarding problem scope 25/06/20 Edited: added some additional diag information I have an issue where a Debian KVM guest built using virt-resize will work flawlessly up ...
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Set UUID when generating a VMDK image from a raw image using qemu-img

It is possible to convert a raw image to a VMDK image with qemu-img like this: qemu-img convert -O vmdk "$_raw" "$_vmdk" I know it is possible to set UUID of the generated VMDK ...
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KVM/QEMU hosts best-practice distro selection (and package)

If I want to run a modern production virtualizer I would expect to turn to RHEL/CentOS as RHEL is the main maintainer for most of the virtualizer "components". But the newest stable version ...
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Run windows driver for usb writing pad without vt-x

I want to use an old usb writing pad, which is a hiddev. My laptop's cpu (intel core 2 duo T5250) doesn't have vt-x. Can virt-manager or wine run the software/driver for windows? Can I use 32 bit ...
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qemu/KVM/libvirt usermode networking: VM as a non-root user, what do I need for root-less networking?

I have run several VMs in KVM/qemu with libvirt, and somehow most of the time networking works. Now, networking has stopped working when VMs are run as a non-root user. I have found little helpful ...
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Configuring screen in QNX, drm-intel crashes

I'm building QNX OS (BSP 7.0 x86_64) and I have a working image. I'm running it over a qemu emulated enviroment. Qemu virtual machine runs in a Windows host and is invoked as follows: ./qemu-system-...
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how to virtualize an oracle linux 8 for arm

I want to try Oracle Linux 8 for arm on a virtual machine before running it on my raspberry pi 4 B. from my research I found it's not possible to do it on a windows 10 for some reason even using ...
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Windows 10 VM ignores QXL video memory changes

[Linux Mint 19.3 host, UCA Stein PPA for QEMU v3, Windows 10 v2004 guest] I'm trying to allocate more video RAM to my Windows 10 VM. I've always done this via virsh, changing these line: <video> ...
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Video output blank on PCI passthrough for QEMU

Ive recently been dunking my head in sulfuric acid, trying to get a GPU to work with QEMU. The screen is first used by the UEFI firmware from boot, but once Arch Linux is loaded it switches to the ...
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Setting up Windows 10 virtual machine in Fedora

I recently made a total shift to Linux(Fedora 32). Ran dual boot with Win 10 for a month and then removed Windows from dual boot. However, MS Office is being taught in my sister's school. So, I need ...
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Why does `virsh console x` hang on “Escape character is ^]”? (qemu-kvm)

The company where i start working for 2 months ago have an old hypervisor running with a few virtual machines. I logged in into one of the machines (at that point i did not know it was a virtual one) ...
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Qemu with TinyCore on win 7 and win 10

When I use Qemu with TinyCore on my Windows 7 everything is ok. When I use the same Qemu on my Windows 10: Qemu with TinyCore is working I can ping my host, and host can ping my qemu ( I use tap ...
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PCI passthrough stopped working in (K)ubuntu 20.04 guest, but only after login

I have been using KVM/QEMU for GPU passthrough successfully for over a year now. In my case, I was passing an GTX1070 to linux and an AMD RX480 to Windows. When my Arch installation got messed up, I ...
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libvirt: how to pass qemu command-line args now libvirt schemas is 404 [duplicate]

This is the only way I have found to pass arguments to qemu: <domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> Unfortunately the url http://libvirt.org/schemas/...
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Help with ConnectX 3 SR-IOV with Linux host and windows guest via kvm

I’m having trouble getting my ConnectX 3 to work via SR-IOV in windows 10 or server 2019 guests in kvm. I get error 43 in both from the latest Mellanox or Microsoft drivers. Literally the exact same ...
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Keyboard passthrough - random key inputs while gaming

I have a Windows 10 VM setup with KVM (qemu). I am passing through my mouse and keyboard input. I looked up the device under /dev/input/by-id/ and added them to the XML: <input type="mouse&...
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Qemu with TinyCoreLinux - networking

My host OS is Windows 7 ( IP: 192.168.0.25 ) and I have Qemu on it. I start TinyCore Linux on Qemu. I want to see the address, for example 192.168.0.40, when I execute command ifconfig in TinyCore. ...
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Add more PCI slots to Virtual Machine

I am running a VM using kvm to simulate a network switch. I need to simulate a lot of links, so all of them are using a PCI connection. If I attach 27 or more interfaces I get an error. Here is the ...
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How to enable multithreaded TCG in QEMU?

I need to run a 64bit system on a processor that doesn't support any virtualization technologies. QEMU can do that easy, no problem, using the TCG accelerator. But only in single thread. No matter how ...
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virsh / qemu external snapshots fail with more than one disk

I am running into this problem and have found no answer in my research. There is a similar post on SuperUser that hasn't had a comment, much less an answer, in close to 10 months. Maybe that is not ...
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new qcow2 from snapshot

I actually have originalImage.qcow2 (~46GB) comporting Snapshot1 Snapshot2 Snapshot3 and the actual VM And now I want snapshotImage.qcow2 (~6GB) comporting Snapshot1 Snapshot2 Snapshot3 And I want ...
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My Windows 10 guest OS emulated with qemu / kvm is not able to boot itself anymore?

Houston,I have a problem trying to boot again Windows 10 guest emulated with qemu and kvm on Linux ubuntu. This problem arised when I have installed Windows server 2019 on the 2 ssd disk (named disk1 ...
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225 views

Convert libvirt xml into qemu command line

I created a VM using virt-manager and I can edit that xml using virsh edit, but I would like to ask you if there is way of converting libvirt xml into qemu command line. I've found that someone else ...
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Nix config to configure qemu vm to mount direct partition

I'd like to do what is mentioned here: https://wiki.archlinux.org/index.php/QEMU#Mounting_a_partition_of_the_guest_on_the_host - essentially mount a partition directly on the VM - this is so I can use ...
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QEMU and CentOS 8: Where is /usr/bin/qemu-system-x86_64 and the qemu-system-x86 package?

I am trying to create and run a virtual machine on a headless server running CentOS 8 (x86-64). After installing the necessary tools like libvirt and kvm it seems qemu is missing its main executable, ...
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Running wic image with qemuarm

I just created a core-image-minimal image for qemuarm and also craeted a partitioned wic image for the same. Now If I just try to run my image with QEMU, the booting hangs forever. The command I used:...
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566 views

How to configure a bridged network for a QEMU/KVM virtual machine so that it's on the same local network connected to via WiFi?

I'd like to configure my QEMU/KVM virtual machine which I set up using aqemu to be on the same local network as the host computer which runs Debian/KDE. Do I have to configure a bridge on the host ...
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How to prevent sound getting distorted when adding an USB passthrough for my controller to a KVM/QEMU virtual machine?

I created a virtual machine with aqemu and the sound was working properly in the vm. Then under Media -> Computer Ports -> Add USB Port I added a passthrough for my mixer connected via USB. After ...
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Failed to initialize kvm permission denied

Just installed KVM to setup some VM's (using this command: sudo apt install qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils libguestfs-tools genisoimage virtinst libosinfo-bin virt-manager ...
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QEMU kernel for raspberry pi 3 with networking and virtio support

I used the QEMU(qemu-system-aarch64 -M raspi3) for emulating the Raspberry pi3 with the kernel from the working image. Everything was working but there was no networking. qemu-system-aarch64 \ -...
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Using QEMU (with the VMM GUI) to access old windows 7 drive

Awhile ago, I said goodbye to windows 7 (rather than upgrade to Microsoft's latest and 'greatest'), and added a new harddrive to my computer. Today, a few upgrades later, and I'm running the Pop_OS! ...
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How can I backup and restore VM with the same vol file size when using virt-manager (qemu-kvm)?

I am using qemu-kvm and virt-manager for running virtual machines. There is a snapshot UI in virt-manager to create snapshots. But after creating some snapshots and reverting back to some snapshots, I ...
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Mount virtual disk device and access to it without being root

I am trying to create a virtual disk to share data with a VirtualBox VM not connected to the Internet. I proceed like follows qemu-img create -f qcow2 hdd.img 2G sudo modprobe nbd max_part=16 sudo ...
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Mac os X does not boot if emulated with qemu/kvm on the WSL2

I've enabled the KVM support on my WSL2 subsystem which run on top of my Windows 10 64 bit and I tried to boot mac os X. It's a shame that it didn't work because this error : root@DESKTOP-N9UN2H3:/...
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Emulating RPi using QEMU

I am trying to use QEMU to emulate an RPI running the buster lite raspbian. The command I use is: qemu-system-arm -kernel ~/qemu_vms/kernel-qemu-4.19.50-buster -cpu arm1176 -m 256 -M versatilepb -...
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Networking between VM guest and host

I have a QEMU guest(ubuntu) running on ubuntu host machine. I have the following interfaces in the guest. A bonded interface bond0 that bonds eth0 and eth1 of the guest. The bond0 of guest has 2 vlans ...
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UDP multicast between FreeBSD QEMU guest and Ubuntu host

I am trying to perform UDP multicast between a FreeBSD QEMU guest and an Ubuntu host (this is part of an effort to use ROS2 on a FreeBSD-based research system). As a basic test, I've been running the ...
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357 views

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0) QEMU with i386 target

I am trying to run a custom Linux kernel version 2.6.26 on QEMU with a busybox for i386 target but it fails at the end of the kernel booting with these two messages: No filesystem could mount root, ...
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1answer
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cc1 out of memory error

I have a machine running Xubuntu 64 bit and I'm trying to compile my pretty long C code. I am using gcc. I chrooted in a raspbian stretch environment because the executable code must run on my ...
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Virt-install error: can't load ignition file

I'm trying to install Fedora CoreOS using virt-install, as described here: https://docs.fedoraproject.org/en-US/fedora-coreos/getting-started/ The exact command I'm running: virt-install --connect ...
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qemu-kvm Windows won't start

I know that theres similar questions, but this kind of question hasn't only one solution, it depends on the user situation, even if the same message is displayed, so what i've found don't work for me ...
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Connecting iOS devices to KVM guest

I'm trying to connect an iPad to a MacOS guest via KVM. The MacOS guest runs fine, PCIe passthrough to a K4000 also works. OS is Fedora 31, 5.5.10-200.fc31.x86_64. Libvirt/virsh is 5.6.0, QEMU is qemu-...
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I'm I using KVM, KQemu or QEMU?

How to know which one I'm currently using when I launch a VM? Are the QEMU and KVM project merged today? Or they still try to completely merge? If I really understand, KVM permit to talk to all the ...
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SSH to QEMU VM via TAP won't connect, SYN flood?

I have a Fedora 28 workstation with a wireless NIC. I use QEMU to create a CentOS 7 VM. I use the following steps to create a TAP interface on the workstation (based on these instructions): On my ...
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qemu network problem - guest and host can not communicate - everything else is ok

I am running a Windows XP guest on a Debian host. For networking, I added a bridge and a tap on the host and use static adresses. Communication between host and guest does not work, but the guest ...
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Do I need CPU (or any) microcode in a QEMU/KVM virtual machine?

A CPU in a virtual machine is only virtual so I would assume that the microcode of the manufacturer does not need to be loaded. The same is probably valid for GPUs. Is this correct? Is there any ...
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322 views

modprobe nbd not releasing connection in Debian 10.2

qemu-nbd - QEMU Disk Network Block Device Server failing with Debian 10.2 Works perfect with Debian 9.12. Does not work any longer with Debian 10.2. Any suggestion of what I might be doing wrong? ...
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408 views

Proxmox PCIe Passthrough is not working

I am trying to pass through a network device to a VM running pfSense and I cannot get it working. When I start pfSense the network card is not visible at all. I think I have set everything up properly,...

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