Questions tagged [virtio]

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QEMU vmvga + Windows - Which driver to use?

I am trying to find a driver for Windows 7/8/10 to use the "vmvga" display driver with QEMU+KVM. For Linux, this driver is available by default, and for OSX there's VmsVGA2, but where can I find the ...
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How to automate windows installation with Virtio driver?

I thought about using autounattend.xml to do this, how should I approach this? Specifically for Windows server 2019. My problem is that I would have to do something like this: select the folder ...
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1answer
42 views

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 ...
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46 views

Proxmox/KVM Bridged networking breaking ssh connection

I'm running into an issue with Proxmox/KVM. I have setup a second bridge (vmbr1) that covers the IP space 172.16.1.0/24. I have assigned 172.16.1.1 to vmbr1. The vmbr1 is setup according to this. I ...
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1answer
371 views

(QEMU) Setup Windows 10 VM on a thinly-provisioned LVM device with discards (a.k.a. trim)

I'm trying to set up a Windows 10 VM using QEMU and I want to use a thinly-provisioned LVM volume and be able to "retrim" the drive in Windows. I created the device with: -drive index=0,media=disk,...
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125 views

Using SR-IOV with virtio passthrough mode on KVM for CSR1000v

I have been struggling for a few days on this and thought its best to look out for someone who has already done this. I am trying to bring up a CSR1000v on KVM in Centos 7 using virt-manager GUI tool ...
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118 views

KVM - Modify from IDE to VirtIO

I imported a CentOS 7 guest from XenServer to KVM. After importing it into KVM the disk bus in use is the IDE. I need to change the disk bus from IDE to VirtIO because VirtIO has better performance. ...
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324 views

Imbalanced IRQs on virtio devices

I noticed in the top on my linux server that one cpu had far more number of software interrupts than all other 7 cores. Digging further, I noticed that this core is pinned to a particular irq which ...
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0answers
366 views

Is it possible to set an IO scheduler in KVM Guest with VirtIO?

Is it possible to set an IO scheduler in a KVM Guest with VirtIO? With the following command i don't get any options to choose cat /sys/block/vda/queue/schedule none Kerneloption are set: root@...
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1k views

libvirt cannot boot windows-uefi guest with virtio storage

i have hyper-v gen2 win-guest and need to migrate on kvm with libvirt. I convert one guest from vhdx to qcow2 with qemu-img, start it with qemu-system and hda-drive, install virtio drivers. After that ...
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2answers
5k views

qemu-kvm reclamation of memory from low-use guests

Is there a way to transparently reclaim, or prevent usage of, memory from a qemu-kvm guest? Scenario A: A guest uses 8GB of RAM during peak hours, it returns back to 4GB of usage at night, but the ...
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1k views

Unidentified network with VIRTIO NIC Drivers after system reboot

I have KVM with VIRTIO network interface. It runs under Windows Server 2012 R2 so I installed RedHat network virtio drivers. It runs properly but after system reboot internet connection is lost. ...
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1answer
387 views

windows guest OS over kvm hypervisor does not preserve disk status after attaching network interface

I have openstack based cloud environment. I have kvm/qemu based hypervisors. I created Windows guest OS vm on one of the hypervisors. And I attached volume(vhd) to vm. I changed disk status to online ...
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1answer
288 views

How to get a virtio disk to show up - kernel config

I'm trying to set up a Gentoo guest on a virtio drive. When I boot the VM using an ubuntu livecd, I do have a /dev/vda on which I installed the system using LVM. I compiled a 4.9.16-gentoo kernel ...
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1answer
128 views

Why is posix.lstat taking such a long time? (duplicity backing up of 9p virtio filesystem)

I have a filesystem mounted with 9p virtio through KVM, and am backing it up using duplicity to a remote SSH server. I' m trying to speed up the backup process, which seems unreasonably slow to me. ...
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1answer
818 views

Change Boot drive in SeaBios

I need to copy my KVM machine for further update. BUT our provider don't provide opportunity to copy a whole machine, just a hard drive. (virtio drive vda/vdb etc) So, I made a new clean machine, ...
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1answer
542 views

RHEL 7.2 - cannot find attached vda disk during install via Mirantis Open Stack

In trying to install RHEL 7 from an ISO (instead of deploying from an existing KVM image) in Mirantis Open Stack, I run into Anaconda not being able to find the attached disk - and so installation ...
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567 views

Weird performace with VirtIO adapter in Linux Guest

I have been battling an extremely odd behavior with the VirtIO adapter for Linux KVM guests. First, my set up: KVM host is a CentOS 6.8 box. Guests are running CentOS 7. The adapters were originally ...
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470 views

kvm virtualized Windows get low disk performances

Disclaimer This is indeed a continuation of this thread. I've opened a new question as the target has slowly shifted, therefore I think was good to open a new post. I will merge back if required. ...
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0answers
495 views

kvm virtio disk performance scales badly with iozone workload

I'm conducting a number of tests in order understand why some of our workloads generate a really poor "user experience" with db related activities. We have a dl160g9 server with a B140i controller (4 ...
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1answer
121 views

How to make data up to date on a shareable disk connected to KVM guest?

I have 2 KVM guests running. One guest (let's call it the writing guest) writes to a virtio hdd (it's a lvm logical volume) periodically. Another guest (reading guest) reads from this disk (it's ...
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699 views

KVM/libvirt: Using virtio disk driver in Debian installer

I try to install Debian in a KVM-based VM using the virtio disk driver/bus and virt-install to run the installer. However, it seems that the installer lacks the virtio driver. Once I switch to bus=...
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576 views

Hardware raid, LVM and KVM cache policy

I have a question about right cache policy for KVM using LVM and hardware raid-controller. So from the bottom: 1. We have LSI RAID controller 9260, 512Mb cache and BBU. Later we also will have ...
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3answers
17k views

Get link speed of an virtio-net network adapter

I have an linux vm running on kvm with virtio-net, and I want to check the link speed. How can I do that? What I tried so far: # ethtool eth0 Settings for eth0: Link detected: yes It seems that ...
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727 views

How to switch in ws2012 from an IDE disk to a Virtio disk?

I am running Windows server 2012 in a virtual machine under Debian Jessie. I tried to follow the Red Hat tutorial in order to switch on the Virtio drivers: 1) I downloaded from Debian the virtio ...
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3answers
29k views

Install windows 2012 R2 over KVM-virtualizaton

I'm trying to install Windows Server 2012 R2 over linux KVM-virtualization. The installation process stops and requires drivers to continue. I'm trying with virtio drivers from fedora but doesn't ...
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1answer
2k views

kvm/qemu host windows guest BSOD about driver_irql_not_less_or_equal for viostore.sys

I have a KVM/Qemu host running 4 Windows Server 2012 guests and after upgrading the host from Ubuntu 12.04 to 14.04 I get blue screens with a bug check string of "driver_irql_not_less_or_equal" that ...
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1answer
3k views

How to migrate from ide to virtio in RHEL 6.5 KVM guest with LVMs

I want to migrate a IDE-using, LVM-based KVM guest running RHEL 6.5. I found this steps in this page: 1) Run virsh edit . From there, edit the config file and adjust all lines of <target ...
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2answers
7k views

Windows Server 2012 R2 doesn't find virtio drivers when installing on KVM

I'm trying to install Windows Server 2012 R2 on a Debian KVM host, but it does not seem to find the drivers. The guest has two drives attached: an install disk and the latest Windows virtio drivers ...
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1answer
443 views

KVM Aggregate Throughput Limited at 1Gb - Virtio Queues Limiting Factor?

I have a KVM host with three NICs and can't get traffic between guests (in same subnet) above 1gbps aggregate. Is this by design and the only way to achieve >1gbps to use multiqueue support? So far, ...
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1answer
3k views

Installing VirtIO drivers on Win7

Context: I am attempting to convince a 64bit Win7 VirtualBox image to run under OpenStack, and Windows isn't my usual platform. Installing the Virtio drivers hasn't been going well. Thus far, what has ...
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3answers
17k views

windows 7 as kvm guest installation with virtio drivers - detected virtio scsi disk shows wrong capacity

I am trying to install windows 7 64bit as a kvm guest. I read here that I should install the virtio scsi driver during installation. I use virt-install to start my installation from the command line ...
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1answer
19k views

Poor network performance with KVM (virtio drivers) - Update: with vhost_net

I've set up several KVM based networks before, and never encountered this issue, can't for the life of me think what I'd have set up differently previously. Setup Basically, Ive got and entirely ...
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0answers
1k views

Ubuntu 14.04 KVM Host - Only network device pcnet working

I've installed a KVM host on Ubuntu 14.04. I've added a networking bridge as br0 and also added the p4p1 network adapter to it. My problem is now that only the "pcnet" networking guest driver is ...
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2answers
14k views

Can I have virtio-win package on CentOS?

In "Red Hat Enterprise Linux 6. Virtualization Host Configuration and Guest Installation Guide" in chapter 10.1 "Installing the KVM Windows para-virtualized drivers" it says: The virtio-win package ...
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1answer
2k views

Migrate CentOS VM using LVM on IDE to run with VirtIO

I'm trying to migrate existing IDE-using, LVM-based CentOS 5.2 VMs to use virtio. The symptom is a kernel panic upon boot when the system can't find any volume groups. Does anyone know how to make ...
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1answer
2k views

Why is there a socket interface on the host and a character device interface on the guest for virtio-serial?

I am trying to establish a communication channel between the host and one of its guest virtual machine using kvm as a hypervisor. For this, I am using virtio-serial. To create the virtual machine, I ...
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1answer
921 views

KVM Win 7 Pro + RH virtio net driver

Host: Debian 7.2 x64. Guest Win 7 Pro 32-bit. Virtio disk drivers work flawlessly, but there's a problem with virtio net (netkvm something) drivers. Virtio drivers come from virtio-win-0.1-74.iso. ...
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4answers
6k views

How to efficiently share host's folder with KVM guests?

I am configuring the service which stores plenty of files uploaded by nginx in /srv/storage dir on host system. These files are processed by worker KVM guests which may create new files or assign ...
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1answer
3k views

FreeBSD, VirtIO, and Virtualbox

I have no experience with VirtIO drivers, and am trying to figure out if it's possible to use them on this server. The server is a FreeBSD 8.2-RELEASE host and ZFS file system, with a Virtual Box-...
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2answers
15k views

Am I using virtio for my KVM guest?

In one of my KVM guest, when I typed the following command, I get the following /sbin/lsmod | grep vi virtio_balloon 3692 0 So does it mean I am using virtio? Update: When I type cat "...
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2answers
3k views

Scanning for new disks attached using virtio?

I can successfully attach disks to a running KVM instance using virsh attach-disk... virsh attach-disk node-1 /dev/vg_lunsr/lun1 vdb Disk attached successfully ...but these new devices aren't seen ...