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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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qemu virtual machines slow during RAID5 check

Operating system: CentOS 7.9 (on both host and guests) Host specs: CPU - AMD EPYC 7502P 32-Core Processor RAM - 250 GB (only 22G used by all VMs) Disk - Four Samsung SSD 870 QVO 4TB, grouped in a mdadm RAID5 This system is running 12 virtual…
William Seligman
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Error starting domain: unsupported configuration: host doesn't support passthrough of host PCI devices - fedora 37

I added the section in the xml file of the VM win10 and I got the following error: Error starting domain: unsupported configuration: host doesn't support passthrough of host PCI devices when trying to start the VM I got this error Traceback (most…
jeanix46
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Windows asking me to sign in with a company email?

Windows is asking me to sign in with my company's email, problem is I don't have one and nor is the company related to me whatsoever. I am trying to run Windows LTSC on QEMU. What gives?
Anm
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"Welcome to Intellek" when trying to install Windows LTSC 2021 in Qemu

On the "Account" stage, it says "Welcome to Intellek" and prompts me to enter my email for Intellek. I do not know what that is, a search reveals it is some company? I downloaded two ISOs from the official Windows evaluation site. I do not know how…
Anm
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Cache mechanisme in kubernetes

I've got the next setup: Proxmox 7.2 CEPH 16.2.9 K3S v1.23.15+k3s1 CEPH CSI v3.7.2 CEPH using as RBD-storage for QEMU images and K8S PVC. When I do disk benchmark in QEMU I've got the next results: Name Read(MB/s) Write(MB/s) SEQ1M Q8…
chs_voks
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Libvirt IPv6 routing to nated network

I'm having trouble getting IPv6 to work for my KVM/qemu guests. I have two bridges setup, one routed (external, non libvirt) bridge for public dedicated ipv4 + ipv6 which works for both protocols. Then I have a libvirt nat bridge (with the routed…
Andrew
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Before-snapshot script hook for Windows guest on Proxmox?

I have a Proxmox server setup with a Windows 10 guest that will be running MSSQL Express. The Windows guest has QEMU guest agent installed and working. For backups, I have a separate server running Proxmox Backup, which is already scheduled to take…
Jacob Jewett
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Get network access from my virtual machine with qemu and Debian Host

I have a (hopefully) simple problem. I try to configure my host system to route network traffic through one physical network interface. Here is my setup: I have an ethernet interface (eth0) and i have a bridge already running. Important to this…
Christian Nill
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Virt-manager: unable to interact with existing vms on a server

I have 3vm's on a kvm. of recent i have been able to manage these vm's visually through virt-manager. on a windows machine i have been using mobaxterm to access the server and everything was working fine. however, after switching to linux(fedora36)…
alpha-evzone
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Trying to install RHEL 7 under QEMU s390x emulation

I'm evaluating the use of QEMU to create s390x Linux virtual machines for use in software builds. I've had some success creating machines using newer Linux distributions such as RHEL 8 and Ubuntu 20, but I really want a RHEL 7 machine. I'm on Fedora…
asboey
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Is it possible to use tcpdump directly with a virtual switch created with vde_switch

I am currently running a lab environment with qemu and a virtual switch (vde_switch). Since I am running on a Mac m1 (monterey), it was not possible to use a bridged connection (vde_switch does not have the -tap option on my Mac...). Therefore, I am…
E. Jaep
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Faulted PCI device causes system to hang, unable to reboot

I run a hypervisor with multiple PCI devices that get passed into the hosted Virtual Machines. I recently encountered an issue with one of the physical cards which caused it to stop responding, and this seems to have caused many parts of my system…
Matt Clark
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Migrate Proxmox VM with VZDump to a system with just QEmu?

So I have a VZDump of a Proxmox VM image. What I want to do is import this to QEmu. How would I go about doing this? So far the results just show me Proxmox to Proxmox and not Proxmox to QEmu.
Definity
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how can I boot from usb device in libvirt qemu machine?

I pass-through a usb device like this:
Wang
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libvirt with qemu guest, bridged networking does not work

I am trying to get a VM operational and working so my router can forward a high port to its SSH, allowing someone on the Internet to connect to the VM. I am familiar with how to make that part of it operational. I first tried bridged networking. …
elyograg
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