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.

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QEMU / KVM - Dedicated 802.1q VLAN for each VM - Communication only via router

I have a Linux firewall router (dedicated machine) with multiple ethN interfaces (my "big firewall"). All forwarded traffic is filtered by a set of iptables rules (default policy DROP). ...
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Can I customize all my operating systems that I will install on kvm/qemu with Virt-customize?

For my private cloud provider, I want to create a virtual machine from the operating system iso I want using kvm/qemu (since I was looking for an alternative to cloud-init, I chose to customize it ...
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How to enable nested virtualization in order to use VirtualBox inside of a KVM virtual machine?

We have a KVM hypervisor (L0, AMD, Kernel: Linux level0kvmhypervisor 4.19.0-12-amd64 #1 SMP Debian 4.19.152-1 (2020-10-18) x86_64 GNU/Linux), which runs a virtual machine that I would like to use as a ...
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What is the difference between “Kernel messages” and “Messages from the init system and the system logger”

In this blog, it gives a Recommended serial kernel parameters, PCs with video card. console=tty0 console=ttyS0,9600n8 It says Kernel messages will appear on both the first virtual terminal and the ...
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How to change Libvirt Job type from 'Cancelled' to 'None'?

After I abort a live migrate, the Job type has changed to 'Cancelled', which makes me unable to migrate again. So,If some libvirt api (or QMP) can help me to change the Job type from 'Cancelled' to '...
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How to get a proper prefix length from DHCPv6 server?

I have two virtual machines with Ubuntu Server 20.04. One of these virtual machines is a DHCPv6 server, and the other one is a client. I am able to set an IPv6 address on the client, but I cannot ping ...
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Is it possible to have both static and dynamic IPv6 addresses on one interface?

I have two Qemu virtual machines with Ubuntu Server. I would like one of them to be a DHCP server. On the second one, I would like to have two IPv6 addresses. One should be static, and the other one ...
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Cannot ping to/from IPv6 address obtained from DHCPv6 server

I have two Qemu virtual machines with Ubuntu Server 20.04. I would like one of them to be a DHCPv6 Server. I am able to get IPv6 address on the client from the server, but I cannot ping to and from ...
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Cannot virsh start my VM after a reboot of physical machine..error only a single IDE controller is supported?

I have a VM running under kvm (it is a .img file), the server it runs on crashed hard and restarted and finally got things up... I think I goofed and ran yum install -y qemu-kvm Which I am sure ...
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KVM Port Forwarding Port 53 to Guest via NAT - Temporary failure in name resolution

I'm trying to forward port 53 from the host to one of my KVM virtual machine guests on the virtbr0 interface (which uses NAT). The guest VM is going to run a customized DNS server. However, after ...
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IBRS suffix of CPU models in QEMU

What is the difference between the IBRS suffix and no-suffix CPU models in QEMU? Which one should I choose?
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KVM host crashes after starting application in guest

We ordered a new dedicated server yesterday and I moved some KVM guest machines from the old KVM host to the new server, which will be our new KVM host. The old KVM host is Intel based and the new one ...
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Is my KVM VM thin provisioned?

I was reading another post here Use Thin LVM Volume for KVM VM trying to understand whether or not KVM is capable of creating thin provisioned VMs. The post from about 8 months ago has both the OP ...
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Broken USB Forwarding for Dexcom G6 via libvirt qemu kvm

I'm attempting to forward a USB device over from my Linux host (Fedora) to a Windows 10 guest. The device seems to be forwarded, however, Windows cannot use it correctly. Additionally, I've tested ...
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Arch Linux - KVM - Sharing SSD and HDD between Arch and it's VMs

I'm relatively new to linux and I'm trying to build an Arch linux that will have a gaming VM. I have 2 disks: a 500GB SSD and a 2TB HDD. I've settled on a LVM with a swapfile and extra space for ...

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