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KVM autotest and virt-test are the former names of a set of virtualization tests that include KVM and other virtualization backe These are the current community projects that have come from a long heritage, including virt-test and KVM-Autotest.

...VT adds support for Virtualization testing, including KVM. These come from a long heritage, including virt-test and KVM-Autotest.

KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualiz ...l module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko.

* Do not pin perf_events. Schedule them as a group and scale PM counter value. ...control MSR_CORE_PERF_GLOBAL_CTRL if there is no guest monitoring event on a host.

This is a possibly incomplete list of KVM features, together with their status. Feel As a guideline, there is a feature description template in [[FeatureDescription/Template|here]]

== Submitting a bug report == When submitting a bug report, make sure to provide the following information:

...way to do guest networking is by setting up a bridge. However, if you use a wireless card, are frequently switching network interfaces or using VPN, or ...are around: either built in to the kernel or loadable. If you are running a plain distribution kernel, you should have all of these around without doin

Nested guests are KVM guests run in a KVM guest. As of Feb 2018 this feature is considered working but experiment * "L1" – a VM running on L0; also called the "guest hypervisor" — as it ''itself'' i

The initialization of a kvm.

It offer the possibility to manage a qemu guest via commandline. The reason to build was to have a simple tool to manage my own qemu guest.

...des information about the design of Device IOTLB for vhost-net to provides a secure and efficient environment for dpdk like program in guest. ...ve translation result could be cached in a vhost device specific IOTLB for a while to speed up the future translation in the future.

There are a variety of sources of kvm kernel modules. Which ones to use depend on whet ...and userspace; these are either installed by default or require installing a kvm package. For someone looking for stability, these are the best choice.

* create a vlan device on the guest virtio-net device * There's a patch [http://thread.gmane.org/gmane.comp.emulators.qemu/37714/focus=37719]

...drive, because it is simply faster. This small how-to is about how to make a disk para-virtualized and boot from it. # create a disk and install os to it by appending "-hda <your_disk_image>" to your vir

We invite you to lead part of the discussion by submitting a speaking people actually use our software. We will reserve a few slots for end

Modern processors come with a wide variety of performance enhancing features such as streaming instructio ...its cpu features unchanged. This is great for compatibility but comes at a performance cost.

|works / not working / working with a few problems '''Status''': works / not working / working with a few problems

* A VT capable Intel processor, or an SVM capable AMD processor On a debian etch system you can install the prerequisites with:

If you are interested in organizing such a group time event, please add they managed to achieve during their time in a quick "results" session.

A functional KVM system consists of three main components: KVM requires a few kernel modules in order to support full virtualization. Most distributi

...command line options, QMP, etc.). Use the source of this page to populate a new one for the new feature, and then add the info. ..., any tips on helping to narrow down the problems to this subsystem? e.g. A minimal command line that reproduces is always helpful.

* [http://www.linuxplanet.com/linuxplanet/reports/6503/1/ Linux as a hypervisor] at Linux Planet * [[Memory|How KVM deals with memory]] - a look inside how KVM interacts with the Linux VM.

...code is available through a git tree (like the kernel itself). To create a repository using git, type [http://git.kernel.org/?p=virt/kvm/kvm.git;a=summary]

...To share host files w/ the guest, we use 9p over virtio in conjunction w/ a filesystem device exporting the portion of the host filesystem that we'd li ...eate a 9pvirtio device exposing the mount_tag <code>hostshare</code> (just a name to identify the mount point). That device is coupled to an fsdev name

The Mac Pro is a great home server machine - twin quad core Xeons, plenty of memory capabili It would seem that there is a special set of registers on Intel processors called the MSR (manufacturs sp

If you are interested in organizing such a group time event, please add * Inflation semantics: Should a host be able to target free pages specifically?

...back. Naturally, a 64-bit guest can only be migrated to a 64-bit host, but a 32-bit guest can be migrated at will. ...s NX-supporting hosts. To disable NX for a given guest, start it with such a parameter: -cpu qemu64,-nx

CPU hotplug is a controverse feature. It exists on qemu-kvm for it should involve a windows-specific driver (to be written)

...rvisor part, especially how to unplug, re-plug the SR-IOV device still has a lot of open questions. ...are two ways of orchestrating datapath switching in case of (for example) a migration.

...San Diego, CA, August 29-31. The Virtualization Micro Conference included a number of presentations relevant for KVM.

...development project from 2013 that was never completed. It is left here as a historical record. The feature described does not exist in any currently sh ...size is greater than what the host has physically available. For example, a 2G host running two VMs each with 2G would be over-committed.

* [[NetConsole| set up a network console]] * [[HowToConfigScript|Configuration Script for KVM]] - a complete management utility, configuration file format, and init script.

If you are interested in organizing such a group time event, please add '''Summary:''' Doing a better job of mitigating speculative-execution-based attacks

** When the installer asks you to select a drive, load the virtio driver (viostor) The solution is to reinstall the MBR. Here is a tutorial for doing this: http://www.sevenforums.com/tutorials/20864-mbr-res

...lease see [http://git.kernel.org/?p=virt/kvm/kvm-guest-drivers-windows.git;a=blob_plain;f=vioserial/app/device.cpp;hb=48b3a3f78fe4711d1561b32c9a1c0ca647 * Only one open allowed at a time for a port.

You'll see a normal SDL window pop up, and if you poke inside the guest you'll find that ...use SPICE. We need to enable the spice server in qemu-kvm. We also need a client to view the guest. So first be sure the client is installed:

...Since iperf is a SW packet generator and normal process shall it be, this a reasonable number. === Assign the VF to a guest ===

* The idea behind it is to have a common framework for hypervisors for IO virtualization

* '''Insufficient PCI window size'''<br>This is a fixable SeaBIOS limitation. Patches are currently under development by [htt ...ers are known to be affected by this, but probably only during early boot. A workaround could be identity mapping, i.e. locating the memory BARs in the

KSM is a memory-saving de-duplication feature, that merges anonymous (private) pages |how many pages changing too fast to be placed in a tree

...can either add these to your distro's module list to load on boot, or run a command like this. The QEMU monitor has a new command, '''pci_add''', which is used to hotadd the pci devices.

The vmglext module for Xorg is not compiled, but comes as a 32-bit binary in the download. This will not work for 64-bit unless you pa ...'''make''' and '''make install-guest'''. Requires sudo to install (if in a system path) and to change ldconfig to look for VMGL loadable modules.

...written a utility called '''kvmctl''' to manage KVM-based VMs, along with a configuration file format, and other associated utilities. Feel free to us A couple of assumptions are made for this work:

Save the following as a .reg file and you can apply the changes by running the file on windows. The wsh tag is a legacy option and no longer has any effect. The default setting for forcews

This is a template page used to help documenting the features and supply the full inf

* In order to assign devices in KVM, you'll need a system which supports VT-d, not to be confused with the VT-x support of you ...there has been some success passing through a secondary Radeon HD 5850 as a VM's secondary display.

* Experience in Developing a Driver for a Complex New Hardware Device on Qemu/KVM - Knut Omang ([https://www.youtube. ...ayer Primitives - Kashyap Chamarthy ([http://www.linux-kvm.org/images/8/85/A-Practical-Look-at-QEMU-Block-Layer-Primitives.pdf slides])

* You want a simple way for your virtual machine to access to the host, to the internet * You are ready to take a huge performance hit.

* Add a read-only memory type. ...rop large ptes when write protecting; just write protect them. When taking a write fault, either drop the large pte, or convert it to small ptes and wri

* Painting a Picture of the KVM Use-cases in the Container World - Fabian Deutsch, Red H * Contributor Q&A Panel - Moderated by Stefan Hajnoczi, Red Hat ([https://www.youtube.com/wat