Questions tagged [qemu]
QEMU (short for "Quick EMUlator") is a free and open-source hosted hypervisor that performs hardware virtualization.
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QEMU/KVM connection drops immediately after starting up virtual machine with GPU passthrough
I have a Windows 10 virtual machine with GPU passthrough in Virt-Manager. Recently it has suddenly started to crash the QEMU/KVM connection it is connected to, as in spontaneously disconnecting. Is ...
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Does running a VM typically affect host input lag?
I'm running a Windows 11 VM via qemu/libvirt on my Fedora 40 (Plasma Wayland) host. The VM is configured to use a passthrough GPU, 25% of my cores (6), and 25% of my memory (16GB). For input it has a ...
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Is my characterisation of KVM and QEMU accurate?
I usually write essays on topics I am studying to help my understanding. Below are excerpts from my study of Virtualisation. I would like comments from real professionals on their accuracy.
KVM is ...
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Which Linux kernel config options are required to get QEMU virtio to work?
I am currently trying to boot a QEMU VM with a virtio-blk hard disk and I am failing. I cannot seem to get the kernel to recognize the virtio device.
I am on a linux-6.1.97 source tree and ...
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can't boot linux distro I made
I need some help, because when I boot my initramfs.img and my bzImage in qemu it boots normally. but then it just goes:
[ 34.354852] dracut: FATAL: iscsiroot requested but kernel/initrd does not ...
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Simulate slow disks in KVM to see effect of LVM cache in test setup
I'm setting up a Linux system in KVM (QEMU) to test the effect of adding a writeback LVM cache on a fast disk in front of a logical volume that resides on a set of very slow disks (a RAID1 LV). This ...
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I am following a video on setting up Qemu/KVM. Setting up of tuned, I am having a problem with missing parameters. How can I correct these errors?
In setting up Qemu and KVM: I received the following notification.
I have seen several others with this same problem,
but I have not been able to find a post with a resolution to implement.
$ sudo ...
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Not working break in for loop in bash script for mounting a VHD
I'm not an experienced programmer. So maybe it's obvious for you why the break command in this script does not terminate the loop, but I can't see what is causing the problem. I want to use the script ...
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How I can sniff network from host to quest that uses wifi usb device?
I want to achieve this:
I have a Linux guest VM using QEMU, using directly a USB Wi-Fi stick via USB passthrough.
In the meantime, using wireshark, I want to sniff the network data from it. In my ...
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USB device not detected upon quest when I usb passthrough using qemu
I run an Ubuntu Iso as:
#!/bin/bash
MEM_SIZE=4096
qemu-system-x86_64 \
-accel kvm \
-cpu host \
-m ${MEM_SIZE} \
-M q35 \
-bios /usr/share/ovmf/OVMF.fd \
-device qemu-xhci \
-usb -device usb-host,...
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PCI Passthrough PCI Slot Reference Change
I'll do my best to explain this as its confusing. I have Qemu/Virtual Machine Manager on my host PC. I created an Ubuntu VM and assigned two PCI slots (which are physical network cards) to it within ...
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How do I solve the booting issue with qemu vexpress-a9 zImage?
I'm studying about the boot loader.
I aim to build the Linux kernel and boot the zImage on qemu-system-arm. First, I installed a cross-compiler for vexpress-a9. Using crosstool-ng, I installed arm-...
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is it possible to boot into luks encrypted raw disk image with qemu/libvirt/virtualbox?
Done dd of my luks encryted drive, now im courious if its possible to create libvirt/quemu guest and attach that luks encrypted raw image and run it as is? Actually I have Fedora 38 on it with several ...
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Why I see different cpu-migrations from top and perf stat?
New to system performance analyze.
I am curious on how CPU affinity affect kvm virtual machine.
So I try to bind vm's vcpu to physical cpu to improve vm's performance.
find the pid of the vm(ecs-...
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How do I physically pass a USB device to a QEMU VM
I've been trying to use a Linux QEMU virtual machine for USB driver development. I wanted to use USB passthrough but when I check the USB device in the VM, it shows some kind of generated product id ...
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USB passthrough in Android emulator on MacOS M1 failing to acquire exclusive access
I am trying to get my Android emulator to see the Wi-Fi dongle or my Ethernet dongle connected over USB to the Macbook Pro M1. I tried the following methods:
Command:
./emulator -avd MyTestEmulator -...
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QEMU, Debian VM doesn't boot after shutdown on M1
On M1, I 'm trying to run a Debian 12 VM.
After the installation process, whether configured using a deb_preseed.cfg (within the Automated Install) or through the GUI configuration, it fails to run (...
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How to start a qemu virtual machine and from the host, execute some commands to finally shut it down
I'm deploying virtual machines with qemu. Installed OS is Debian with linux kernel debian 6.8.11-amd64.
The way I deploy a vm is directly with qemu-system command (i.e no vm manager).
In a command ...
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libvirtd not starting after unsuccessful GPU passthrough
I attempted to follow this guide on Ubuntu 22.04:
https://wiki.gentoo.org/wiki/GPU_passthrough_with_libvirt_qemu_kvm
I didn't need to change my BIOS or my Kernel, and I skipped the step involving the ...
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OpenRC not starting services
For testing purposes, I need a quick way to generate a root filesystem to use for booting freshly built Linux kernels. I've been doing this by using Docker to create a filesystem and then transferring ...
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Can I use $USER enviroment variable inside qemu.config?
I am installing my first KVM/QEMU based virt manager.
As per the instructions on Arch Wiki, one needs to change the config file of qemu.config.
sudo vim /etc/libvirt/qemu.conf
I used vim to edit the ...
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How do I properly chroot from a amd64 artix VM into a mounted aarch64 armtix OS image?
I want to chroot into an armtix (aarch64) OS image inside an artix VM.
I copied qemu-aarch64-static into the mounted /usr/bin
and then tried to chroot into the mounted image.
It works, however, most ...
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How can I create a VM in virt-manager that can access the internet through the host but can't even see the host or other devices on the LAN?
I want to be able to create multiple VMs for testing purposes -- questionable websites, files that could be infected with a virus, etc.
I want to make sure these VMs should be able to access the ...
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How to place a qemu vm in background (it means that it should run between the processes but nothing should be shown on the screen)
I would like to run the qemu vm that you see below runs between the processes,so I don't want to see any monitor,graphic,terminal window,nothing should be shown on the screen.
/usr/local/bin/qemu-...
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Understanding the flash translation layer - SSD emulation
Can anyone suggest me a blog/article on how to get an NVMe simulation environment up and running? I'm basically looking at using NVMe as an emulated device in Qemu and tracing the read, write and stat ...
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Use .qcow2 VM file format for VirtualBox
VirtualBox, supports several other file formats, but no .qcow2 format for the time being.
The Virtmanager, in turn supports the current open source .qcow2 format, but not the outdated .qcow format.
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Limiting the file size of .qcow2 files [closed]
Qcow 2 files are an open source file format for virtual machines. In my opinion, unlike .vmdk files, they do not offer the option of specifying a maximum file size. This means that they can constantly ...
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Converting a virtual machine a standalone directory hosted on Ubuntu
A software platform I'm responsible for requires a minimal Ubuntu distribution with software that is partially integrated with the OS and uses TTY terminals. We've typically contained the OS in a ...
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How to let two qemu instances access each other under the same network? The host is Windows 11
The first instance is:
.\qemu-system-x86_64.exe -cpu IvyBridge -smp 4 -m 4096 -nic user,hostfwd=tcp:127.0.0.1:10022-:22 D:\vm1.qcow2 -accel whpx
So the network backend is user mode network of qemu, ...
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QEMU/KVM: capturing keyboard shortcuts by the guest operating system
I have installed QEMU/KVM on my Ubuntu and created a new VM.
When trying to switch apps using Alt+Tab or "Show Applications" using Windows key it is captured and interpreted by the host OS ...
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Is it possible to hardware accelerate spice with an nvidia gpu?
It is possible to use virgl with an nvidia gpu:
<graphics type="egl-headless">
<gl rendernode="/dev/dri/renderD128"/>
</graphics>
<video>
<model type=...
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How do I compare performance of two linux kernel images running on QEMU?
I have built a tracing utility for the Linux Kernel and am testing the same on QEMU. I want to compare the performance of the kernel with and without the tracer. How do I go about doing this?
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QEMU - Bridge networking does not work on Debian Bookworm guest on M1 Pro host
I have a Macbook Pro M1 Pro host running a Ubuntu and Debian guests on UTM. The Debian guest is unable to connect to the internet if I use anything but emulated VLAN as the network setting. This is ...
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Qemu GPU/Display passthrough
I want to passthrough my GPU to the QEMU Guest and it complete control of my monitor (seem as if it was the ONLY OS running)
I have tried on a laptop with only the built-in monitor and the screen just ...
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What can cause network drop when running a VM with virt-manager?
I'm new to virt-manager, qemu and libvirt so I barely know how to use them. I use virt-manager's GUI to make it easier for me to do a transition from VirtualBox (including VBoxManage) to KVM.
By far I ...
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Pass-through of OBS Virtual Camera to QEMU
I'd like to use my OBS virtual camera in a virtual machine.
OBS will not run within a virtual machine unless I perform a GPU-passthrough, which I feel is unnecessary and undesirable in this situation.
...
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Display bmp image using u-boot on virtual QEMU
I have an issue of displaying a bmp image using u-boot on virtual QEMU. I've built QEMU using buildroot and added the following options in u-boot.fragement file to support splash screen and virtio gpu:...
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How To Set Screen Resolution Of TinyCore On GNS3 Really High?
In GNS3, I added a Firefox to the topology. It was installed on a TineyCore VM on Qemu. When I open the VM, the Max screen resolution that is available is 1024x768 which is very small for my 4K ...
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How to Enable Restrict User Networking in virt-manager QEMU/KVM User Session?
I want to isolate my network between host and guest in QEMU User Session (qemu:///session). block the unnecessary guest to host and guest to guest networking.
I found an article on QEMU wiki talks ...
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Trying to virtualize my Windows 10 install on linux in a dual boot setup
Currently I am dual booting Windows 10 and linux (fedora 39 with KDE), here both are on separate SDDs. I was hoping to use linux for most things and use Windows 10 for games. But here, I am trying to ...
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libvirt can't bind device to runtime due to permission denied
I'm trying to start a new domain via libvirt virsh start my-domain.
But it fails with this permission denied error
error: internal error: Process exited prior to exec: libvirt: error : Failed to bind ...
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Yocto Implementation of QEMU
What exactly is the difference between the Yocto Implementation of QEMU and QEMU in general?
It is clearly stated right at the beginning of the relevant chapter in the Yocto documentation that they ...
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trying to run rasberry pi on qemu says -redir invalid option
I am trying to run Rasberry Pi on qemu but it says -redir invalid option.
Here's my command:
qemu-system-arm -kernel kernel-qemu-4.4.34-jessie -cpu arm1176 -m 256 -M versatilepb -no-reboot -serial ...
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Problem writing custom PCI driver with QEMU
I want to write a Linux driver that allows me to allocate and handle MSI interrupts. At the moment, the nvec = pci_alloc_irq_vectors(pdev, 1, nvec, PCI_IRQ_ALL_TYPES) function is returning -22.
In ...
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running X86 Virtualbox VM on an Apple silicon Mac, UTM not working
My college provides a virtual machine (SliTaz VM, possibly an old Linux distro) to run veriluoc which is a software to design and simulate logic gates. The problem is that VM was designed to run on ...
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Write QCOW2 image to iSCSI LUN?
I've been trying to write a QCOW2 image to an iSCSI LUN target but have been unsuccessful. Based on this link, this should be possible (and should be possible without having to mount the iSCSI LUN as ...
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QEMU ftp connection refused on linux guest but not in windows host (qemu blocking localhost connection??)
I'm using QEMU to run debian linux on my windows machine. I setup a filezilla ftp server running on localhost in my windows. I can connect to the ftp server from my windows cmd
But i can't connect to ...
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Busybox/Qemu Networking
I made a simple Linux Distribution using Busybox that i run in Qemu.
How can i get networking to work?
My Goal is somthing like that:
I type in
wget google.com
and it saves the index.html file to the ...
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Adding a JFFS2 file system to QEMU
I am trying to set up a development environment using QEMU to emulate a Zynq UltraScale+ MPSoC ZCU102. I have a Petalinux image that I am able to run with QEMU and now I want to pass in and mount file ...
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203
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Libvirt iptable chain LIBVIRT_FWX has no effect on interface internal traffic
I created a libvirt network in open mode and added the iptable rules that would have been created for a nat mode network. My plan is to basically create a nat network but add some custom iptable rules ...
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