Oracle® Linux

KVM User's Guide

F29966-15July 2021

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Table of ContentsPreface .............................................................................................................................................. v1 About Oracle Linux KVM ................................................................................................................. 1

1.1 Description of the Oracle Linux KVM Feature ........................................................................ 11.2 Guest Operating System Requirements ................................................................................. 11.3 System Requirements ........................................................................................................... 21.4 About Virtualization Packages ............................................................................................... 3

2 Installing KVM User Space Packages .............................................................................................. 52.1 Configuring Yum Repositories and ULN Channels ................................................................. 5

2.1.1 Oracle Linux 7 ........................................................................................................... 52.1.2 Oracle Linux 8 ........................................................................................................... 7

2.2 Installing Virtualization Packages .......................................................................................... 92.2.1 Installing Virtualization Packages During an Oracle Linux System Installation ................ 92.2.2 Installing Virtualization Packages on an Existing System ............................................ 102.2.3 Upgrading Virtualization Packages ............................................................................ 102.2.4 Switching Application Streams on Oracle Linux 8 ...................................................... 11

2.3 Validating the Host System ................................................................................................. 123 KVM Usage .................................................................................................................................. 13

3.1 Checking the libvirt Daemon Status ..................................................................................... 133.2 Base Operations ................................................................................................................. 14

3.2.1 Creating a New Virtual Machine ............................................................................... 143.2.2 Starting and Stopping Virtual Machines ..................................................................... 143.2.3 Deleting a Virtual Machine ....................................................................................... 15

3.3 Configuring a Virtual Machine with a Virtual Trusted Platform Module .................................... 163.4 Working With Storage for KVM Guests ................................................................................ 17

3.4.1 Storage Pools .......................................................................................................... 173.4.2 Storage Volumes ..................................................................................................... 193.4.3 Managing Virtual Disks ............................................................................................ 20

3.5 Working With Memory and CPU Allocation .......................................................................... 223.5.1 Configuring Virtual CPU Count ................................................................................. 223.5.2 Configuring Memory Allocation ................................................................................. 23

3.6 Setting up Networking for KVM Guests ................................................................................ 253.6.1 Setting up and Managing Virtual Networks ................................................................ 253.6.2 Adding or Removing a vNIC ..................................................................................... 263.6.3 Bridged and Direct vNICs ......................................................................................... 283.6.4 Interface Bonding for Bridged Networks .................................................................... 29

3.7 Cloning Virtual Machines .................................................................................................... 303.7.1 Preparing a Virtual Machine for Cloning .................................................................... 303.7.2 Cloning a Virtual Machine by Using the virt-clone Command ...................................... 323.7.3 Cloning a Virtual Machine by Using Virtual Machine Manager .................................... 32

4 Known Issues for Oracle Linux KVM .............................................................................................. 354.1 Upgrading From QEMU 3.10 to Version 4.2.1 Can Prevent Existing KVM Guests FromStarting on Oracle Linux 7 ........................................................................................................ 354.2 QEMU Does Not Support Video Device Error on Oracle KVM Stack ...................................... 35

5 Oracle VirtIO Drivers for Microsoft Windows ................................................................................... 375.1 What's New ........................................................................................................................ 375.2 Supported Releases, Operating Systems, and Configuration Limits ....................................... 37

5.2.1 Supported Environments .......................................................................................... 385.2.2 Supported Guest Operating Systems ........................................................................ 385.2.3 Microsoft Windows Compatibility Signing ................................................................... 39

5.3 Downloading the Oracle VirtIO Drivers for Microsoft Windows ............................................... 405.4 Installing the Oracle VirtIO Drivers for Microsoft Windows ..................................................... 40

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Oracle® Linux

5.4.1 Installing the Oracle VirtIO Drivers for Microsoft Windows on Existing MicrosoftWindows Guests .............................................................................................................. 415.4.2 Installing the Oracle VirtIO Drivers for Microsoft Windows During Microsoft WindowsGuest Installation .............................................................................................................. 435.4.3 Optional Configuration Changes ............................................................................... 44

5.5 Upgrading the Oracle VirtIO Drivers for Microsoft Windows ................................................... 455.6 Silently Installing or Upgrading the Oracle VirtIO Drivers for Microsoft Windows ...................... 465.7 Uninstalling the Oracle VirtIO Drivers for Microsoft Windows ................................................. 475.8 Known Limitations and Workarounds ................................................................................... 48

5.8.1 Security Alert for Unsigned Drivers ........................................................................... 485.8.2 Found New Hardware Wizard Displayed ................................................................... 505.8.3 Microsoft Windows Server 2012 Data Center Guests With Failover Clustering CannotGet IP Address ................................................................................................................ 50

iv

PrefaceOracle® Linux: KVM User's Guide provides information about how to install, configure, and use the OracleLinux KVM packages to run guest system on top of a bare metal Oracle Linux system. This documentationprovides information on using KVM on a standalone platform in an unmanaged environment. Typicalusage in this mode is for development and testing purposes, although production level deployments aresupported. Oracle recommends that customers use Oracle Linux Virtualization Manager for more complexdeployments of a managed KVM infrastructure.

AudienceThis document is intended for administrators who need to configure and use KVM on Oracle Linuxsystems. It is assumed that readers are familiar with and have a general understanding of Linux systemadministration.

Related DocumentsThe documentation for this product is available at:

https://docs.oracle.com/en/operating-systems/oracle-linux/.

Oracle recommends that you review related documentation at:

https://docs.oracle.com/en/virtualization/oracle-linux-virtualization-manager/

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Diversity and InclusionOracle is fully committed to diversity and inclusion. Oracle respects and values having a diverse workforcethat increases thought leadership and innovation. As part of our initiative to build a more inclusive culture

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Diversity and Inclusion

that positively impacts our employees, customers, and partners, we are working to remove insensitiveterms from our products and documentation. We are also mindful of the necessity to maintain compatibilitywith our customers' existing technologies and the need to ensure continuity of service as Oracle's offeringsand industry standards evolve. Because of these technical constraints, our effort to remove insensitiveterms is ongoing and will take time and external cooperation.

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Chapter 1 About Oracle Linux KVM

Table of Contents1.1 Description of the Oracle Linux KVM Feature ................................................................................ 11.2 Guest Operating System Requirements ......................................................................................... 11.3 System Requirements ................................................................................................................... 21.4 About Virtualization Packages ....................................................................................................... 3

This chapter provides a high-level overview of the Kernel-based Virtual Machine (KVM) feature on OracleLinux, the user space tools that are available for installing and managing a standalone instance of KVM,and the differences between KVM usage in this mode and usage within a managed environment providedby Oracle Linux Virtualization Manager.

1.1 Description of the Oracle Linux KVM FeatureThe KVM feature provides a set of modules that enable you to use the Oracle Linux kernel as a hypervisor.KVM supports both x86_64 and aarch64 processor architectures and is supported on Oracle Linux 7 andOracle Linux 8 systems using either RHCK or any UEK release since Unbreakable Enterprise KernelRelease 4.

By default, KVM is built into the Unbreakable Enterprise Kernel (UEK) release. KVM features are activelydeveloped and might vary depending on platform and kernel release. If you are using UnbreakableEnterprise Kernel you should refer to the release notes for the kernel release that you are currently usingto obtain information about features and any known issues or limitations that may apply. See UnbreakableEnterprise Kernel Documentation for more information.

For enterprise or clustered KVM deployments on Oracle Linux, consider using Oracle Linux VirtualizationManager which is a server virtualization management platform. Through its Administration or VM portals,you can configure, monitor, and manage an Oracle Linux KVM environment, including hosts, virtualmachines, storage, networks, and users. Oracle Linux Virtualization Manager also provides a REST APIfor managing your Oracle Linux KVM infrastructure, allowing you to integrate Oracle Linux VirtualizationManager with other management systems or to automate repetitive tasks with scripts. Find out more athttps://docs.oracle.com/en/virtualization/oracle-linux-virtualization-manager/.

1.2 Guest Operating System RequirementsThe following guest operating systems can be used when installed within a standalone instance of KVM.

Linux Guest Operating Systems

Table 1.1

Linux Operating System 32-bit Architecture 64-bit Architecture

Oracle Linux 6 Yes* Yes

Oracle Linux 7 Not available Yes

Oracle Linux 8 Not available Yes

Red Hat Enterprise Linux 6 Yes* Yes

Red Hat Enterprise Linux 7 Not available Yes

Red Hat Enterprise Linux 8 Not available Yes

1

Microsoft Windows Guest Operating Systems

Linux Operating System 32-bit Architecture 64-bit Architecture

CentOS 6 Yes* Yes

CentOS 7 Not available Yes

CentOS 8 Not available Yes

SUSE Linux Enterprise Server 12 SP5 Not available Yes

SUSE Linux Enterprise Server 15 SP1 Not available Yes

Ubuntu 16.04 Not available Yes

Ubuntu 18.04 Not available Yes

Ubuntu 20.04 Not available Yes

Important

* cloud-init is unavailable for 32-bit architectures

You can download Oracle Linux ISO images and disk images from Oracle Software Delivery Cloud: https://edelivery.oracle.com/linux.

Microsoft Windows Guest Operating SystemsTable 1.2

Microsoft Windows Operating System 32-bit Architecture 64-bit Architecture

Microsoft Windows Server 2019 Not available Yes

Microsoft Windows Server 2016 Not available Yes

Microsoft Windows Server 2012 R2 Not available Yes

Microsoft Windows Server 2012 Not available Yes

Microsoft Windows Server 2008 R2 SP1 Not available Yes

Microsoft Windows Server 2008 SP1 Yes Yes

Microsoft Windows 10 Yes Yes

Microsoft Windows 8.1 Yes Yes

Microsoft Windows 8 Yes Yes

Microsoft Windows 7 SP1 Yes Yes

Note

Oracle recommends that you install the Oracle VirtIO Drivers for Microsoft Windowsin Windows virtual machines for improved performance for network and block (disk)devices and to resolve common issues. The drivers are paravirtualized drivers forMicrosoft Windows guests running on Oracle Linux KVM hypervisors.

For instructions on how to obtain and install the drivers, see Chapter 5, Oracle VirtIO Drivers for MicrosoftWindows.

1.3 System RequirementsAlthough most systems running Oracle Linux 7 or Oracle Linux 8 are capable of using KVM, there aresome general hardware requirements and guidelines that you should follow to run a guest on a hostsystem.

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About Virtualization Packages

• Bare metal host. KVM is supported when it is run on a bare metal host. Nested virtualizationscenarios are not supported for KVM.

• CPU. The host system CPU must have virtualization features Intel (VT-x) or AMD (AMD-V) enabled.If these are not available, you should check that virtualization is enabled in the system firmware BIOS orUEFI. There should be at least one processor core or thread available for each virtual machine that youintend to run on the system, and at least one processor core or thread should be available for the hostoperating system.

• Memory. A minimum of 2 GB RAM must be available to the host operating system. RAM required foreach virtual machine should be physically available for each virtual machine that you configure and run.

• Storage. The minimum disk space, usually 6 GB, required for the host operating system should bemet. Each virtual machine requires it's own storage for the guest operating system and for swap usage.You should cater to around 6 GB, at minimum, per virtual machine that you intend to create, but youshould consider the purpose of the virtual machine and scale accordingly.

1.4 About Virtualization Packages

Oracle Linux provides several virtualization packages that enable you work with KVM. You can installvirtualization packages from the Oracle Linux yum server or from the Unbreakable Linux Network (ULN).Packages are provided from various upstream projects, including:

• https://www.linux-kvm.org/page/Main_Page

• https://libvirt.org/

• https://www.qemu.org/

In most cases, the following packages are the minimally required for a virtualization host:

• libvirt: This package provides an interface to KVM, as well as the libvirtd daemon for managingguest virtual machines.

• qemu-kvm: This package installs the QEMU emulator that performs hardware virtualization so thatguests can access host CPU and other resources.

• virt-install: This package provides command line utilities for creating and provisioning guest virtualmachines.

• virt-viewer: This package provides a graphical utility that can be loaded into a desktop environmentto access the graphical console of a guest virtual machine.

As an alternative to installing virtualization packages individually, you can install virtualization packagegroups.

The Virtualization Host package group contains the minimum set of packages that are requiredfor a virtualization host. If your Oracle Linux system includes a GUI environment, you can also choose toinstall the Virtualization Client package group.

3

4

Chapter 2 Installing KVM User Space Packages

Table of Contents2.1 Configuring Yum Repositories and ULN Channels ......................................................................... 5

2.1.1 Oracle Linux 7 ................................................................................................................... 52.1.2 Oracle Linux 8 ................................................................................................................... 7

2.2 Installing Virtualization Packages .................................................................................................. 92.2.1 Installing Virtualization Packages During an Oracle Linux System Installation ........................ 92.2.2 Installing Virtualization Packages on an Existing System .................................................... 102.2.3 Upgrading Virtualization Packages .................................................................................... 102.2.4 Switching Application Streams on Oracle Linux 8 .............................................................. 11

2.3 Validating the Host System ......................................................................................................... 12

This chapter describes how to configure the appropriate ULN channels or yum repositories, and how toinstall user space tools to manage a standalone instance of KVM. A final check is performed to validatewhether the system is capable of hosting guest virtual machines.

2.1 Configuring Yum Repositories and ULN Channels

Virtualization packages and their dependencies are available in a variety of locations on the Oracle Linuxyum server and on the Unbreakable Linux Network (ULN), depending on Oracle Linux release, the systemarchitecture and use case or support requirements.

2.1.1 Oracle Linux 7

Due to the availability of several very different kernel versions and the requirement for more recentversions of user space tools that may break compatibility with RHCK, there are several different yumrepositories or ULN channels across the different supported architectures for Oracle Linux 7. Packages inthe different channels have different use cases and have different levels of support. This section describesthe available yum repositories and ULN channels for each architecture.

Repositories and Channels That Are Available for x86_64 Platforms

Location Description

Yum repository:

ol7_latest

ULN channel:

ol7_x86_64_latest

The virtualization packages that are provided in this repositoryor ULN channel maximize compatibility with RHCK and withRedHat Enterprise Linux. Packages from this repository orULN channel are fully supported for all kernels.

Yum repository:

ol7_kvm_utils

ULN channel:

ol7_x86_64_kvm_utils

The virtualization packages that are provided in this repositoryor ULN channel take advantage of newer features andfunctionality available in upstream packages. These packagesare also engineered to work with KVM features that areenabled in the latest releases of UEK. If you install thesepackages, you must also install the latest version of either UEKR4 or UEK R5.

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Oracle Linux 7

Location DescriptionNote

The ol7_kvm_utils andol7_x86_64_kvm_utils channelsdistribute 64-bit packages only. If youmanually installed any 32-bit packages,for example, libvirt-client, Yumupdates from these channels will fail.To use the ol7_kvm_utils andol7_x86_64_kvm_utils channels,you must first remove any 32-bitversions of the packages distributedby these channels that are installed onyour system.

You may choose to configure on-premises virtualizationthe same way that you configure systems on Oracle CloudInfrastructure or other Oracle products that use KVM. OracleLinux provides specific virtualization packages in this channelto assist with the configuration.

Packages in this channel are delivered with limited support.Limited support coverage is only available for packages thatare tested on Oracle Linux 7 with UEK. The following are thelimitations and requirements:

• A minimum of Oracle Linux 7.4 is required.

• A minimum of Unbreakable Enterprise Kernel Release 4 isrequired.

• Guest operating systems, as supported on Oracle CloudInfrastructure and described at https://docs.oracle.com/iaas/Content/Compute/References/images.htm.

• KVM guests boot by using iSCSI, VirtIO, VirtIO-SCSI or IDEdevice emulation.

Yum repository:

ol7_developer

ULN channel:

ol7_x86_64_developer

Yum repository:

ol7_developer_kvm_utils

ULN channel:

ol7_x86_64_developer_kvm_utils

The virtualization packages that are provided in theserepositories or ULN channels take advantage of newerfeatures and functionality that is available upstream, but areunsupported and are made available for developer use only.

If you are using the Oracle Linux yum server, you canconfigure these repositories by installing the oraclelinux-developer-release-el7 package and then enabling theserepositories by editing the repository files or by using yum-config-manager.

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Oracle Linux 8

Repositories and Channels That Are Available for aarch64 Platforms

Yum Repositories ULN Channels Description

ol7_latest ol7_aarch64_latest The virtualization packages that are provided inthis repository or ULN channel include the latestvirtualization packages, which are available andfully supported on Unbreakable Enterprise KernelRelease 5.

ol7_developer ol7_aarch64_developer The virtualization packages that are provided inthis repository or ULN channel take advantageof newer features and functionality, wh8ich areavailable upstream, but are unsupported and aremade available for developer use only.

Caution

Virtualization packages may also be available in the ol7_developer_EPEL yumrepository or the ol7_arch_developer_EPEL ULN channel. These packagesare unsupported and contain features that might never be tested on Oracle Linuxand may conflict with virtualization packages from other channels. If you intend touse packages from any of the repositories or channels that are previously listed,first uninstall any virtualization packages that installed from this repository. You canalso disable this repository or channel or set exclusions to prevent virtualizationpackages from being installed from this repository.

Depending on your use case and support requirements, you must enable the repository or ULN channelthat you require before installing the virtualization packages from that repository or ULN channel.

If you are using ULN, follow these steps to ensure that the system is registered with ULN and that theappropriate channel is enabled:

1. Log in to https://linux.oracle.com with your ULN user name and password.

2. On the Systems tab, from the list of registered systems, select the link name for the specified system.

3. On the System Details page, select Manage Subscriptions.

4. On the System Summary page, from the list of available channels, select each of the requiredchannels, then click the right arrow to move each channel to the list of subscribed channels.

5. Select Save Subscriptions.

If you are using the Oracle Linux yum server, you can either edit the repository configuration files in /etc/yum.repos.d/ directly; or alternatively, if you have the yum-utils package installed, you can use theyum-config-manager command, for example:

sudo yum-config-manager --enable ol7_kvm_utils ol7_UEKR6

If you want to prevent yum from installing the package versions from a particular repository, you can setan exclude option on these packages for that repository. For instance, to prevent yum from installing thevirtualization packages in the ol7_developer_EPEL repository, use the following command:

sudo yum-config-manager --setopt="ol7_developer_EPEL.exclude=libvirt* qemu*" --save

2.1.2 Oracle Linux 8

The number of options available on Oracle Linux 8 are significantly reduced as the available kernels arenewer and there are less options to select from.

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Oracle Linux 8

Repositories and Channels That Are Available for Oracle Linux 8

Yum Repositories ULN Channels Description

ol8_appstream ol8_x86_64_appstream

ol8_aarch64_appstream

The virtualization packages that are providedin this repository or ULN channel maximizecompatibility with RHCK and with RedHatEnterprise Linux. Packages from thisrepository or ULN channel are fully supportedfor all kernels.

Packages released in this repository or ULNchannel are released as part of the defaultDNF module: virt

ol8_kvm_appstream ol8_x86_64_kvm_appstream

ol8_aarch64_kvm_appstream

The virtualization packages that are providedin this repository or ULN channel takeadvantage of newer features and functionalityavailable in upstream packages. Thesepackages are also engineered to workwith KVM features that are enabled in thelatest releases of UEK. If you install thesepackages, you must also install the latestversion of UEK R6 to use these features.

The Oracle KVM stack packages releasedin this repository or ULN channel areavailable as a separate DNF module stream:virt:kvm_utils.

See Section 2.2.4, “Switching ApplicationStreams on Oracle Linux 8” for moreinformation.

Since the Application Stream repository or channel is required for system software on Oracle Linux 8, it isenabled by default on any Oracle Linux 8 system.

If you intend to use the virt:kvm_utils application stream for improved functionality and integrationwith newer features released within UEK, you must subscribe to the ol8_kvm_appstream yum repositoryor ol8_base_arch_kvm_utils ULN channel.

If you are using ULN, you can check that the system is registered with ULN and that the appropriatechannel is enabled:

1. Log in to https://linux.oracle.com with your ULN user name and password.

2. On the Systems tab, from the list of registered systems, select the link name for the specified system.

3. On the System Details page, select Manage Subscriptions.

4. On the System Summary page, from the list of available channels, select each of the requiredchannels, then click the right arrow to move each channel to the list of subscribed channels.

5. Select Save Subscriptions.

If you are using the Oracle Linux yum server, make sure that you have installed the most recent version ofthe oraclelinux-release-el8 package and enable the required repositories. For example:

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Installing Virtualization Packages

sudo dnf install -y oraclelinux-release-el8sudo dnf config-manager --enable ol8_appstream ol8_kvm_appstream

2.2 Installing Virtualization Packages

Virtualization packages provide an interface to the KVM hypervisor, as well as user-space tools.

2.2.1 Installing Virtualization Packages During an Oracle Linux SystemInstallation

You can use the following procedures to install virtualization packages during system installation. TheAnaconda installation program can be used to install a single virtualization host. You can use a kickstart fileto install virtualization hosts over the network.

Note that installation of virtualization software during system install defaults to a KVM stack mostcompatible with RHCK. If you wish to use an alternate KVM stack you may need to perform steps to addother yum or dnf configuration and if you are running Oracle Linux 8 you may need to select an alternateapplication stream for the installation.

2.2.1.1 Using the Installation Program to Install Virtualization Hosts

The following steps describe how to install a virtualization host with the Oracle Linux graphical installationprogram:

1. Boot the Oracle Linux installation media and proceed to the Software Selection screen.

2. Select one of the following virtualization host types:

Minimum Virtualization Host (Available on Oracle Linux 7 and Oracle Linux 8)

a. Select Virtualization Host in the Base Environment section.

b. Select Virtualization Host in the Add-ons for SelectedEnvironment section.

Virtualization Host with GUI (Available only on Oracle Linux 7)

a. Select Server with GUI in the Base Environment section.

b. Select the following package groups in the Add-ons forSelected Environment section:

• Virtualization Client

• Virtualization Hypervisor

• Virtualization Tools

3. Follow the prompts to complete the installation.

2.2.1.2 Using a Kickstart File to Install Virtualization Hosts

You can install virtualization hosts by specifying individual packages or package groups in the %packagessection of a kickstart file.

Specify virtualization packages individually, as in the following example:

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Installing Virtualization Packages on an Existing System

%packageslibvirtqemu-kvmvirt-install

Specify the appropriate package groups for the installation type in the %packages section of the kickstartfile by using the @GroupID format:

Minimum Virtualization Host %packages@virtualization-hypervisor@virtualization-tools# The following group is optional. Uncomment line to include...:#@virtualization-platform

Virtualization Host with GUI %packages@virtualization-hypervisor@virtualization-client@virtualization-platform@virtualization-tools

2.2.2 Installing Virtualization Packages on an Existing System

1. Log in as the root user on the target Oracle Linux system.

2. Ensure that your system has the appropriate Yum repository or ULN channel enabled for thevirtualization package versions that you wish to install. See Section 2.1, “Configuring Yum Repositoriesand ULN Channels” for more information.

3. Update the system so that it has the most recent packages available.

• If you are using Oracle Linux 7, run the yum update command.

• If you are using Oracle Linux 8, run the dnf update command.

4. Install virtualization packages on the system.

• If you are using Oracle Linux 7 run the following commands to install the base virtualization packagesand additional utilities:

sudo yum groupinstall "Virtualization Host"sudo yum install qemu-kvm virt-install virt-viewer

• If you are using Oracle Linux 8 run the following commands to install the base virtualization packagesand additional utilities:

sudo dnf module install virtsudo dnf install virt-install virt-viewer

See also Section 2.2.4, “Switching Application Streams on Oracle Linux 8”.

2.2.3 Upgrading Virtualization Packages

Virtualization packages are updated by using the standard yum update or dnf updatecommand.Note that if you want to change the versions of the virtualization packages to match the versions that areshipped in a particular yum repository or ULN channel, you might need to specify the channel or repositoryfrom or to which you are installing packages. For example, you would update to the latest supportedvirtualization packages that are available in the ol7_kvm_utils repository as follows:

sudo yum --disablerepo="*" --enablerepo="ol7_kvm_utils" update

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Switching Application Streams on Oracle Linux 8

If you want to downgrade packages to a version in an alternate repository or channel, for example, todowngrade from the virtualization packages in the ol7_kvm_utils repository to the version of the samepackages in the ol7_latest repository, you must first remove the existing packages before installing thepackages from the alternate repository:

sudo yum remove libvirt* qemu* virt-installsudo yum --disablerepo="*" --enablerepo="ol7_latest" install libvirt qemu-kvm virt-install

2.2.4 Switching Application Streams on Oracle Linux 8

Virtualization packages on Oracle Linux 8 are released as a DNF module: virt. The default stream in themodule contains packages that are capable of working with both RHCK and UEK. Alternate versions of thepackages that are capable of taking advantage of features supported only in UEK are available within aseparate application stream: virt:kvm_utils.

For more information about DNF modules and application streams, see Oracle® Linux 8: ManagingSoftware on Oracle Linux.

Switching to the Oracle KVM Stack

On an existing Oracle Linux 8 system, you can switch from the default KVM stack to the Oracle KVM stackin the virt:kvm_utils stream by performing the following steps:

• Remove any packages from the existing default virt stream:

sudo dnf module remove virt -y —all

• Reset the virt module state so that it is neither enabled nor disabled:

sudo dnf module reset virt -y

• Enable the virt:kvm_utils module and stream:

sudo dnf module enable virt:kvm_utils -y

• Perform any necessary package upgrade or downgrade operations to handle dependencies for theenabled module and stream:

sudo dnf --allowerasing distro-sync

• Install the base packages from the virt:kvm_utils stream:

sudo dnf module install virt:kvm_utils -y

Warning

Pre-existing guests that were created using the default KVM stack are notcompatible and do not start using the Oracle KVM stack.

Note that although you are able to switch to the Oracle KVM stack and install the packages while usingRHCK, the stack is not compatible. You must be running a current version of UEK to use this software.

Switching to the Default KVM Stack

On an existing Oracle Linux 8 system, you can switch from the Oracle KVM stack to the default KVM stackby performing the following steps:

• Remove any packages from the existing Oracle virt:kvm_utils stream:

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Validating the Host System

sudo dnf module remove virt:kvm_utils -y --all

• Reset the virt module state so that it is neither enabled nor disabled:

sudo dnf module reset virt -y

• Enable the virt module and stream:

sudo dnf module enable virt -y

• Perform any necessary package upgrade or downgrade operations to handle dependencies for theenabled module and stream:

sudo dnf --allowerasing distro-sync

• Install the base packages from the virt stream:

sudo dnf module install virt -y

Warning

Pre-existing guests that were created using the Oracle KVM stack are notcompatible and do not start using the default KVM stack.

2.3 Validating the Host System

The libvirt tools provide a validation utility that checks whether a system is capable of functioning correctlyas a virtualization host. The utility can check for several virtualization functionality, but KVM functionality iscovered specifically by testing the qemu virtualization type.

To test whether a system can act as a KVM host, run the following command:

sudo virt-host-validate qemu

If all of the checks return a PASS value, the system can host guest virtual machines. If any of the tests fail,a reason is provided and information is displayed on how to resolve the issue if such an option is available.

Note

If the following message is displayed, the system is not capable of functioning as aKVM host:

QEMU: Checking for hardware virtualization: FAIL (Only emulated CPUs are available, performance will be significantly limited)

In the event that this message is displayed, attempts to create or start a virtualmachine on the host are likely to fail.

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Chapter 3 KVM Usage

Table of Contents3.1 Checking the libvirt Daemon Status ............................................................................................. 133.2 Base Operations ......................................................................................................................... 14

3.2.1 Creating a New Virtual Machine ....................................................................................... 143.2.2 Starting and Stopping Virtual Machines ............................................................................. 143.2.3 Deleting a Virtual Machine ............................................................................................... 15

3.3 Configuring a Virtual Machine with a Virtual Trusted Platform Module ............................................ 163.4 Working With Storage for KVM Guests ........................................................................................ 17

3.4.1 Storage Pools .................................................................................................................. 173.4.2 Storage Volumes ............................................................................................................. 193.4.3 Managing Virtual Disks .................................................................................................... 20

3.5 Working With Memory and CPU Allocation .................................................................................. 223.5.1 Configuring Virtual CPU Count ......................................................................................... 223.5.2 Configuring Memory Allocation ......................................................................................... 23

3.6 Setting up Networking for KVM Guests ........................................................................................ 253.6.1 Setting up and Managing Virtual Networks ........................................................................ 253.6.2 Adding or Removing a vNIC ............................................................................................. 263.6.3 Bridged and Direct vNICs ................................................................................................. 283.6.4 Interface Bonding for Bridged Networks ............................................................................ 29

3.7 Cloning Virtual Machines ............................................................................................................ 303.7.1 Preparing a Virtual Machine for Cloning ............................................................................ 303.7.2 Cloning a Virtual Machine by Using the virt-clone Command .............................................. 323.7.3 Cloning a Virtual Machine by Using Virtual Machine Manager ............................................ 32

Several tools exist for administering the libvirt interface with KVM. In most cases, a variety of differenttools are capable of performing the same operation. This document focuses on the tools that you canuse from the command line. However, if you are using a desktop environment, you might consider usinga graphical user interface (GUI) such as the Virtual Machine Manager, to create and manage virtualmachines (VMs). For more information about Virtual Machine Manager, see https://virt-manager.org/.

3.1 Checking the libvirt Daemon Status

To check the status of the libvirt daemon, run the following command on the virtualization host:

sudo systemctl status libvirtd

The output should indicate that the libvirtd daemon is running, as shown in the following exampleoutput:

* libvirtd.service - Virtualization daemon Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled) Active: active (running) since time_stamp; xh ago

If the daemon is not running, start it by running the following command:

sudo systemctl start libvirtd

After you verify that the libvirtd service is running, you can start provisioning guest systems.

13

Base Operations

3.2 Base Operations

In this section base operations are described including creating, starting and stopping, and deleting virtualmachines.

3.2.1 Creating a New Virtual Machine

The virt-install command is the most commonly used command-line tool for creating and settingup new virtual machines. This utility has many options to allow you to customize your virtual machine andcontrol how it is created. For complete documentation on this tool, view the VIRT-INSTALL(1) manualpage; or, for a quick list of options, you can run the virt-install --help command.

The following example, illustrates the creation of a simple virtual machine and assumes that virt-vieweris installed and available to load the installer in a graphical environment:

virt-install --name guest-ol8 --memory 2048 --vcpus 2 \--disk size=8 --location OracleLinux-R8.iso --os-variant ol8.0

The following are detailed descriptions of each of the options that are specified in the example:

• --name is used to specify a name for the virtual machine. This is registered as a domain within libvirt.

• --memory is used to specify the RAM available to the virtual machine and is specified in MB.

• --vcpus is used to specify the number of virtual CPUs that should be available to the virtual machine.

• --disk is used to specify hard disk parameters. In this case, only the size is specified in GB. If a pathis not specified the disk image is created as a qcow file automatically. If virt-install is run as root,the disk image is created in /var/lib/libvirt/images/ and is named using the name specified forthe virtual machine at install. If virt-install is run as an ordinary user, the disk image is created in$HOME/.local/share/libvirt/images/.

• --location is used to provide the path to the installation media. This can be an ISO file, or anexpanded installation resource hosted at a local path or remotely on an HTTP or NFS server.

• --os-variant is an optional specification but provides some default parameters for each virtualmachine that can help improve performance for a specific operating system or distribution. For acomplete list of options available, run osinfo-query os.

When the command is run, the virtual machine is created and automatically started to boot using theinstall media specified in the location parameter. If you have the virt-viewer package installed andthe command has been run in a terminal within a desktop environment, the graphical console is openedautomatically and you can proceed with the guest operating system installation within the console.

3.2.2 Starting and Stopping Virtual Machines

After a virtual machine is created within KVM, it is registered as a domain within libvirt and you are able tomanage it using the virsh command. To obtain a complete list of all registered domains and their status,run the following command:

virsh list --all

Output:

Id Name State---------------------------------------------------- 1 guest-ol8 running

14

Deleting a Virtual Machine

Use the virsh help command to view available options and syntax. For example, to find out more aboutthe options available to listings of virtual machines, run virsh help list. This command shows optionsto view listings of virtual machines that are stopped or paused or that are currently active.

To start a virtual machine, run the following command:

virsh start guest-ol8

Output:

Domain guest-ol8 started

To gracefully shutdown a virtual machine, run the following command:

virsh shutdown guest-ol8

Output:

Domain guest-ol8 is being shutdown

To reboot a virtual machine, run the following command:

virsh reboot guest-ol8

Output:

Domain guest-ol8 is being rebooted

To suspend a virtual machine, run the following command:

virsh suspend guest-ol8

Output:

Domain guest-ol8 suspended

To resume a suspended virtual machine, run the following command:

virsh resume guest-ol8

Output:

Domain guest-ol8 resumed

To forcefully stop a virtual machine, run the following command:

virsh destroy guest-ol8

Output:

Domain guest-ol8 destroyed

3.2.3 Deleting a Virtual Machine

The following steps can be followed to remove a virtual machine from a system:

1. If you are unsure of where the disk for the virtual machine is located, obtain this information before youremove the virtual machine, so that you can find it later and remove it manually. You can do this bydumping information about the virtual machine and checking for the source files. For example, run:

virsh dumpxml --domain guest-ol8 | grep 'source file'

Output:

15

Configuring a Virtual Machine with a Virtual Trusted Platform Module

<source file='/home/testuser/.local/share/libvirt/images/guest-ol8-1.qcow2'/>

2. Shutdown the virtual machine, if possible. For example, run:

virsh shutdown guest-ol8

If the virtual machine can't be shutdown gracefully you can force it to stop by running:

virsh destroy guest-ol8

3. To delete the virtual machine, run:

virsh undefine guest-ol8

This step removes all configuration information about the virtual machine from libvirt. Storage artifactssuch as virtual disks are left intact. If you need to remove these as well, you can delete them manuallyfrom their location returned in the first step in this procedure. For example, you could run:

rm /home/testuser/.local/share/libvirt/images/guest-ol8-1.qcow2

Note that it is not possible to delete a virtual machine if it has snapshots. You should remove anysnapshots using the virsh snapshot-delete command before attempting to remove a virtual machinethat has any snapshots defined.

3.3 Configuring a Virtual Machine with a Virtual Trusted PlatformModule

A virtual Trusted Platform Module (vTPM) is a software-based representation of a physical TrustedPlatform Module 2.0 chip. A vTPM acts as any other virtual device and provides security-related functionssuch as random number generation, attestation, key generation. When added to a virtual machine, avTPM enables the guest operating system to create and store keys that are private and not exposed to theguest operating system. This means that if a virtual machine is compromised, the risk of its secrets beingcompromised is greatly reduced because the keys can be used only by the guest operating system forencryption or signing.

You can add a vTPM to an existing Oracle Linux 7 KVM virtual machine. When you configure a vTPM, thevirtual machine files are encrypted but not the disks. Although, you can choose to add encryption explicitlyfor the virtual machine and its disks.

Note

Virtual Trusted Platform Modules are only available on Oracle Linux 7 KVM guests.

To provide a vTPM to an existing Oracle Linux 7 KVM virtual machine, follow the steps below.

1. Install the vTPM packages:

yum -y install swtpm libtpms swtpm-tools

2. Create a socket for the vTPM device:

swtpm socket --tpmstate dir=/path/to/file --ctrl type=unixio,path=/path/to/file/filename

3. Shutdown the KVM virtual machine.

4. Modify the KVM virtual machine's XML to include the TPM, as shown in the tpm section in the followingexample:

16

Working With Storage for KVM Guests

<devices> ... </input> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <tpm model='tpm-crb'> <backend type='emulator' version='2.0'/> </tpm> <graphics type='vnc' port='-1' autoport='yes'> <listen type='address'/> </graphics> ...</devices>

5. Start the KVM virtual machine.

3.4 Working With Storage for KVM GuestsLibvirt handles a variety of different storage mechanisms that an administrator can configure for use byvirtual machines. These mechanisms are organized into different pools or units. By default, libvirt usesdirectory-based storage pools for the creation of new disks, but pools can be configured for differentstorage types including physical disk, NFS and iSCSI.

Depending on the storage pool type that is configured, different storage volumes can be made availableto your virtual machines to be used as block devices. In some cases, such as when using iSCSI pools,volumes do not need to be defined as the LUNs for the iSCSI target are automatically presented to thevirtual machine.

Note that you do not need to specifically define different storage pools and volumes to use libvirt withKVM. These tools are used to help administrators manage how storage is used and consumed by virtualmachines as they need it. It is perfectly acceptable to use the default directory-based storage and takeadvantage of manually mounted storage at the default locations.

Oracle recommends using Oracle Linux Virtualization Manager to easily manage and configure complexstorage requirements for KVM environments.

3.4.1 Storage Pools

Storage pools provide logical groupings of storage types that are available to host the volumes that canbe used as virtual disks by a set of virtual machines. A wide variety of different storage types are provided.Local storage can be used in the form of directory based storage pools, file system storage and disk basedstorage. Other storage types such as NFS and iSCSI provide standard network based storage, while RBDand Gluster types provide support for distributed storage mechanisms. More information is provided athttps://libvirt.org/storage.html.

Storage pools help to abstract underlying storage resources from the virtual machine configurations. Thisis particularly useful if you suspect that resources such as virtual disks may change physical location ormedia type. This becomes even more important when using network based storage and target paths, DNSor IP addressing may change over time. By abstracting this configuration information, an administrator canmanage resources in a consolidated way without needing to update multiple virtual machine configurations.

You can create transient storage pools that are available until the host reboots, or you can definepersistent storage pools that are restored after a reboot.

Transient storage pools are started automatically as soon as they are created and the volumes that arewithin them are made available to virtual machines immediately, however any configuration informationabout a transient storage pool is lost after the pool is stopped, the host reboots or if the libvirtd service is

17

Storage Pools

restarted. The storage itself is unaffected, but virtual machines configured to use resources in a transientstorage pool lose access to these resources. Transient storage pools are created using the virsh pool-create command.

For most use cases, you should consider creating persistent storage pools. Persistent storage pools aredefined as a configuration entry that is stored within /etc/libvirt. Persistent storage pools can bestopped and started and can be configured to start when the host system boots. This can be useful aslibvirt can take care of automatically mounting and enabling access to network based resources. Persistentstorage pools are created using the virsh pool-define command, and usually need to be started afterthey have been created before you are able to use them.

The following examples show how you can set up directory based storage, and perform basic operationson it.

To create a directory-based storage pool named pool_dir at /share/storage_pool on the hostsystem, run:

virsh pool-define-as pool_dir dir --target /share/storage_pool

You can verify that the pool was created by running:

virsh pool-list --all

To start the storage pool and make it accessible to any virtual machines, run:

virsh pool-start pool_dir

If you require the storage pool to start at boot, run:

virsh pool-autostart pool_dir

To stop the storage pool, run:

virsh pool-stop pool_dir

To remove the storage pool configuration completely, run:

virsh pool-undefine pool_dir

Other storage pool types can be easily created using the same virsh pool-define-as command.Options that are used with this command depend on the storage type that you select when you create yourstorage pool. For example, to create file system based storage, that mounts a formatted block device, /dev/sdc1, at the mount point /share/storage_mount, you can run:

virsh pool-create-as pool_fs fs --source-path /dev/sdc1 --target /share/storage_mount

Similarly, you can easily add an NFS share as a storage pool. For example, run:

virsh pool-create-as pool_nfs netfs --source-path /ISO --source-host nfs.example.com \--target /share/storage_nfs

It is also possible to create an XML file representation of the storage pool configuration and load theconfiguration information from file using the virsh pool-define command. For example, you couldcreate a storage pool for a Gluster volume by creating an XML file named gluster_pool.xml with thefollowing content:

<pool type='gluster'> <name>pool_gluster</name> <source>

18

Storage Volumes

<host name='192.0.2.1'/> <dir path='/'/> <name>gluster-vol1</name> </source></pool>

This example assumes that a Gluster server is already configured and running on a host with IP address192.0.2.1 and that a volume named gluster-vol1 is exported. Note that the glusterfs-fusepackage must be installed on the host and you should verify that you are able to mount the Gluster volumebefore attempting to use it with libvirt.

Run the following command to load the configuration information from the gluster_pool.xml file intolibvirt.

virsh pool-define gluster_pool.xml

Note that Oracle recommends using Oracle Linux Virtualization Manager when attempting to use complexnetwork based storage such as Gluster.

For more information on the XML format for a storage pool definition, see https://libvirt.org/formatstorage.html#StoragePool.

3.4.2 Storage Volumes

Storage volumes are created within a storage pool and represent the virtual disks that can be loaded asblock devices within one or more virtual machines. Some storage pool types do not need storage volumesto be created individually as the storage mechanism may present these to as block devices already. Forexample, iSCSI storage pools present the individual LUNs for an iSCSI target as separate block devices.

In some cases, such as when using directory or file system based storage pools, storage volumes areindividually created for use as virtual disks. In these cases, several disk image formats are supportedalthough some formats, such as qcow2, may require additional tools such as qemu-img for creation.

For disk based pools, standard partition type labels are used to represent individual volumes; while forpools based on the logical volume manager, the volumes themselves are presented individually within thepool.

Depending on the storage pool type, you can create new storage volumes using the virsh vol-createcommand. This command expects you to provide an XML file representation of the volume parameters.For example, to create a new volume in storage pool named pooldiryou could create an XML file,volume1.xml, with the required parameters and run:

virsh vol-create pooldir volume1.xml

The XML for a volume may depend on the pool type and the volume being created, but in the case of asparsely allocated 10 GB image in qcow2 format, the XML may look similar to the following:

<volume> <name>volume1</name> <allocation>0</allocation> <capacity unit="G">10</capacity> <target> <path>/home/testuser/.local/share/libvirt/images/volume1.qcow2</path> <permissions> <owner>107</owner> <group>107</group> <mode>0744</mode> <label>virt_image_t</label> </permissions> </target>

19

Managing Virtual Disks

</volume>

For more information, see https://libvirt.org/formatstorage.html#StorageVol.

You can use the virsh vol-create-as command to create a volume directly by passing command linearguments to it directly. Many of the available options, such as the allocation or format have default valueset, so you can typically just specify the name of the storage pool where the volume should be created, thename of the volume and the capacity that you require. For example, run the command:

virsh vol-create-as --pool pooldir --name volume1 --capacity 10G

Note that storage volumes can be sparsely allocated by setting the allocation value for the initial size ofthe volume to a value lower than the capacity of the volume. The allocation indicates the initial or currentphysical size of the volume, while the capacity indicates the size of the virtual disk as it is presented to thevirtual machine. Sparse allocation is frequently used to over-subscribe physical disk space where virtualmachines may ultimately require more disk space than is initially available. For a non-sparsely allocatedvolume, the allocation matches or exceeds the capacity of the volume. Exceeding the capacity of the diskprovides space for metadata, if required.

You can use the virsh vol-info command to view information about a volume to determine its type,capacity, and allocation. For example:

virsh vol-info --pool pooldir volume1

Output:

Name: volume1Type: fileCapacity: 9.31 GiBAllocation: 8.00 GiB

You can clone a storage volume using the virsh vol-clone command. This command simply takes thename of the original volume and the name of the cloned volume as a parameter and the clone is created inthe same storage pool with identical parameters. For example:

virsh vol-clone --pool pooldir volume1 volume1-clone

Note that you can use the --pool option if you have volumes with matching names in different pools onthe same system and you need to specify which pool the operation should take place in.

You can delete a storage volume by running the virsh vol-delete command. For example, to deletethe volume named volume1 in the storage pool named pooldir, run the following command:

virsh vol-delete volume1 --pool pooldir

As long as a storage volume is not being used by a virtual machine, you can resize it using the virshvol-resize command. For example:

virsh vol-resize --pool pooldir volume1 15G

It is generally not advisable to reduce the size of an existing volume, as this can risk destroying data.However, if you attempt to resize a volume to reduce it, you must specify the --shrink option with thenew size value.

3.4.3 Managing Virtual Disks

Virtual disks are attached to virtual machines, usually as block devices based on disk images stored atsome or other path. Virtual disks can be defined for a virtual machine when it is created, or can be added

20

Managing Virtual Disks

to an existing virtual machine. The command line tools available for the purpose of managing virtual disksare not completely consistent in terms of their handling of storage volumes and storage pools.

3.4.3.1 Adding or Removing a Virtual Disk

Storage volumes can be attached to a virtual machine as a virtual disk when the virtual machine is created.The virt-install command allows you to specify the volume or storage pool directly for any use ofthe --disk option. For example, to use an existing volume when creating a virtual machine, using virt-install, specify the disk as follows:

virt-install --name guest --disk vol=storage_pool1/volume1.qcow2...

You can equally use virt-install to create a virtual disk as a volume within an existing storage poolautomatically at install. For example, to create a new disk image as a volume within the storage poolnamed storage_pool1:

virt-install --name guest --disk pool=storage_pool1 size=10...

Tools to attach a volume to an existing virtual machine are limited and it is generally recommended thatyou use a GUI tool like virt-manager or cockpit to assist with this. If you expect that you may need towork with volumes a lot, consider using Oracle Linux Virtualization Manager.

You can use the virsh attach-disk command to attach a disk image to an existing virtual machine.This command requires that you provide the path to the disk image when you attach it to the virtualmachine. If the disk image is a volume, you can obtain it's correct path by running the virsh vol-listcommand first.

virsh vol-list storage_pool_1

Output:

Name Path -------------------------------------------------------------------- volume1 /share/disk-images/volume1.qcow2

Attach the disk image within the existing virtual machine configuration so that it is persistent and attachesitself on each subsequent restart of the virtual machine:

virsh attach-disk --config --domain guest1 --source /share/disk-images/volume1.qcow2 --target sdb1

Note that you can use the --live option with this command to temporarily attach a disk image to arunning virtual machine; or you can use the --persistent option to attach a disk image to a runningvirtual machine and also update it's configuration so that the disk is attached on each subsequent restart.

3.4.3.2 Removing a Virtual Disk

You can remove a virtual disk from a virtual machine using the virsh detach-disk command. Forexample, to remove the disk at the target sdb1 from the configuration for the virtual machine namedguest1, you could run:

virsh detach-disk --config guest1 sdb1

Note that you can use the --live option with this command to temporarily detach a disk image from arunning virtual machine; or you can use the --persistent option to detach a disk image from a runningvirtual machine and also update it's configuration so that the disk is permanently detached from the virtualmachine on subsequent restarts.

21

Working With Memory and CPU Allocation

Where disks are attached as block devices within a guest virtual machine, you can obtain a listing of theblock devices attached to a guest so that you are able to identify the disk target that is associated with aparticular source image file, by running the virsh domblklist command. For example, run:

virsh domblklist guest1

Detaching a virtual disk from the virtual machine does note delete the disk image file or volume from thehost system. If you need to delete a virtual disk, you can either manually delete the source image file ordelete the volume from the host.

3.4.3.3 Extending a Virtual Disk

You can effectively extend a virtual disk image by using the virsh blockresize command while thevirtual machine is running. For example, to increase the size of the disk image at the source location /share/disk-images/volume1.qcow2 on the running virtual machine named guest1 to 20GB, run:

virsh blockresize guest1 /share/disk-images/volume1.qcow2 20GB

You can check that the resize has worked by checking the block device information for the running virtualmachine, using the virsh domblkinfo command. For example to list all block devices attached toguest1 in human readable format:

virsh domblkinfo guest1 --all --human

The virsh blockresize command allows you to scale up a disk on a live virtual machine, but it doesnot guarantee that the virtual machine is able to immediately identify that the additional disk resource isavailable. For some guest operating systems, restarting the virtual machine may be required before theguest is capable of identifying the additional resources available.

Individual partitions and file systems on the block device are not scaled using this command. You need toperform these operations manually from withing the guest, as required.

3.5 Working With Memory and CPU Allocation

You can configure how many virtual CPUs are active and how much memory is available for a given virtualmachine. These configuration changes can be made on a running virtual machine (hot plugging or hotunplugging) or can be stored in the virtual machine XML configuration file. Note that changes can belimited by the virtual machine host, the hypervisor, or by the original virtual machine description.

3.5.1 Configuring Virtual CPU Count

Optimizing vCPUs can impact the resource efficiency of your virtual machines. One way to optimize is toadjust how many vCPUs are assigned to a virtual machine. Hot plugging or hot unplugging vCPUs is whenyou configure vCPU count on a running virtual machine.

You can change the number of virtual CPUs that are active in a guest virtual machine using the virshsetvcpus command. By default, virsh setvcpus works on running guest virtual machines. If you wantto change the virtual CPU count for a stopped virtual machine, you add the --config option.

For example, run the following command to set the number of virtual CPUs on a running virtual machine:

virsh setvcpus domain-name, id, or uuid count-value --live

Note that the count value cannot exceed the number of CPUs assigned to the guest virtual machine. Thecount value also might be limited by the host, hypervisor, or from the original description of the guest virtualmachine.

22

Configuring Memory Allocation

The following command options are available:

• domain

A string value representing the virtual machine name, ID or UUID.

• count

A number value representing the number of virtual CPUs.

• --maximum

Controls the maximum number of virtual CPUs that can be hot-plugged the next time the guest virtualmachine is booted. Therefore, it can only be used with the --config flag.

• --config

Changes the stored XML configuration for the guest virtual machine and takes effect when the guest isstarted.

• --live

The guest virtual machine must be running and the change takes place immediately, thus hot plugging avCPU.

• --current

Affects the current guest virtual machine.

• --guest

Modifies the CPU state in the current guest virtual machine.

• --hotpluggable

Configures the vCPUs so they can be hot unplugged.

You can use the --config and --live options together if supported by the hypervisor.

If you do not specify --config, --live, or --current, the --live option is assumed. So, if you do notselect an option and the guest virtual machine is not running, the command fails. In addition, if no optionsare specified, it is up to the hypervisor whether the --config option is also assumed. This determineswhether the XML configuration is adjusted to make the change persistent.

3.5.2 Configuring Memory Allocation

To improve the performance of a virtual machine, you can assign additional host RAM to the virtualmachine. You can also decrease the amount of allocated memory to free up the resource for other virtualmachines or tasks. Hot plugging or hot unplugging memory is when you configure memory size on arunning virtual machine.

You use the virsh setmem command to change the available memory for a virtual machine. If you wantto change the maximum memory that can be allocated, use the virsh setmaxmem command.

To change a virtual machine's memory allocation, run:

virsh setmem domain-name, id, or uuid --kilobytes size

23

Configuring Memory Allocation

You must specify the size as a scaled integer in kibibytes and the new value cannot exceed the amountyou specified for the virtual machine. Values lower than 64 MB are unlikely to work with most virtualmachine operating systems. A higher maximum memory value does not affect active virtual machines. Ifthe new value is lower than the available memory, it shrinks possibly causing the virtual machine to crash.

The following command options are available:

• domain

A string value representing the virtual machine name, ID or UUID.

• size

A number value representing the new memory size, as a scaled integer. The default unit is KiB, but youcan select from other valid memory units:

• b or bytes for bytes

• KB for kilobytes (103 or blocks of 1,000 bytes)

• k or KiB for kibibytes (210 or blocks of 1024 bytes)

• MB for megabytes (106 or blocks of 1,000,000 bytes)

• M or MiB for mebibytes (220 or blocks of 1,048,576 bytes)

• GB for gigabytes (109 or blocks of 1,000,000,000 bytes)

• G or GiB for gibibytes (230 or blocks of 1,073,741,824 bytes)

• TB for terabytes (1012 or blocks of 1,000,000,000,000 bytes)

• T or TiB for tebibytes (240 or blocks of 1,099,511,627,776 bytes)

• --config

Changes the stored XML configuration for the guest virtual machine and takes effect when the guest isstarted.

• --live

The guest virtual machine must be running and the change takes place immediately, thus hot pluggingmemory.

• --current

Affects the memory on the current guest virtual machine.

To set the maximum memory that can be allocated to a virtual machine, run:

virsh setmaxmem domain-name_id_or_uuid size --current

You must specify the size as a scaled integer in kibibytes unless you also specify a supported memoryunit, which are the same as for the virsh setmem command.

All other options for virsh setmaxmem are the same as for virsh setmem with one caveat. If youspecify the --live option be aware that not all hypervisors allow live changes of the maximum memorylimit.

24

Setting up Networking for KVM Guests

3.6 Setting up Networking for KVM Guests

KVM provides tools to add or remove vNICs of different types and to facilitate complex networkingarchitectures. Networking in KVM is achieved by creating virtual Network Interface Cards (vNICs) on theguest virtual machine. vNICS are mapped to the host system's own network infrastructure, by connectingto a virtual network running on the host itself; by directly using a physical interface on the host; through theuse of Single Root I/O Virtualization (SR-IOV) capabilities on a PCIe device; or by use of a network bridgethat allows the vNIC to share a physical network interface on the host.

In most cases, vNICs are defined when the virtual machine is first created, however the libvirt API allowsfor vNICs of different types to be added or removed from virtual machines as required and also facilitateshot plugging to allow you to perform these actions on a running virtual machine to avoid downtime.

Networking with KVM can be complex as it can involve components that are configured directly on the hostitself, configuration for the virtual machine within libvirt and also configuration for the network within therunning guest operating system. As a result, for many development and testing environments, it is oftensufficient to configure each vNIC to use the virtual networking provided by libvirt. This driver is usedto create a virtual network that uses Network Address Translation (NAT) to allow virtual machines to gainaccess to external resources. This approach is simple to configure and often facilitates similar networkaccess already configured on the host system.

Where virtual machines may need to belong to specific subnetworks, a bridged network can be used.Network bridges use virtual interfaces that are mapped to and share a physical interface on the host. In thisconfiguration, network traffic from a virtual machine behaves like it is coming from an independent systemon the same physical network as the host system. Depending on the tools used, this may require somemanual changes to the host network configuration before it can be set up for a virtual machine.

Networking for virtual machines can also be configured to directly use a physical interface on the hostsystem. This can provide network behavior similar to using a bridged network interface in that the vNICbehaves as if it is connected to the physical network directly. Direct connections tend to use the macvtapdriver to extend physical network interfaces to provide a range of functionality that can also provide avirtual bridge that behaves similarly to a bridged network but which is easier to configure and maintain andwhich offers improved performance.

KVM is able to use SR-IOV for passthrough networking where a PCIe interface supports this functionality.The SR-IOV hardware must be properly set up and configured on the host system before you are able toattach the device to a virtual machine and configure the network to use this device.

Where network configuration is likely to be complex, Oracle recommends using Oracle Linux VirtualizationManager. Simple networking configurations and operations are described here to facilitate the majority ofbasic deployment scenarios.

3.6.1 Setting up and Managing Virtual Networks

If you are considering using virtual networking with NAT for your virtual machine networking requirements,you can use the default virtual network that is set up by libvirt for virtual machines or you can create andmanage different virtual networks within KVM for the purpose of grouping virtual machines on their ownsubnetworks.

Use the following command to list all virtual networks that are configured on the host:

virsh net-list --all

Output:

25

Adding or Removing a vNIC

Name State Autostart Persistent---------------------------------------------------------- default active yes yes

You can find out more about a network using the virsh net-info command. For example, to find outabout the default network, run:

virsh net-info default

Output:

Name: defaultUUID: 16318035-eed4-45b6-99f8-02f1ed0661d9Active: yesPersistent: yesAutostart: yesBridge: virbr0

Note that the virtual network uses a network bridge, called virbr0. This is not to be confused withtraditional bridged networking. The virtual bridge is not connected to a physical interface and relies onNAT and IP forwarding to connect virtual machines to the physical network beyond. Libvirt also handlesIP address assignment for virtual machines using DHCP. The default network is typically in the range192.168.122.1/24. To see the full configuration information about a network, use the virsh net-dumpxml command:

virsh net-dumpxml default

Output:

<network> <name>default</name> <uuid>16318035-eed4-45b6-99f8-02f1ed0661d9</uuid> <forward mode='nat'> <nat> <port start='1024' end='65535'/> </nat> </forward> <bridge name='virbr0' stp='on' delay='0'/> <mac address='52:54:00:82:75:1d'/> <ip address='192.168.122.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.122.2' end='192.168.122.254'/> </dhcp> </ip></network>

3.6.2 Adding or Removing a vNIC

You can use the virsh attach-interface command to add a new vNIC to an existing virtual machine.This command can be used to create a vNIC on a virtual machine that uses any of the networking typesthat KVM is capable of supporting.

virsh attach-interface --domain guest --type network --source default --config

You must specify the following parameters with this command:

• --domain

The virtual machine name, ID or UUID.

• --type

26

Adding or Removing a vNIC

The type of networking that the vNIC should use. Available options include:

• network for a libvirt virtual network using NAT

• bridge for a bridge device on the host

• direct for a direct mapping to one of the host's network interfaces or bridges

• hostdev for a passthrough connection using a PCI device on the host.

• --source

The source that should be used for the network type specified. These vary depending on the type:

• for a network, specify the name of the virtual network

• for a bridge specify the name of the bridge device

• for a direct connection specify the name of the host's interface or bridge

• for a hostdev connection specify the PCI address of the host's interface formatted asdomain:bus:slot.function.

• --config

Changes the stored XML configuration for the guest virtual machine and takes effect when the guest isstarted.

• --live

The guest virtual machine must be running and the change takes place immediately, thus hot pluggingthe vNIC.

• --current

Affects the current guest virtual machine.

Additional options are available to further customize the interface, such as setting the MAC address orconfiguring the target macvtap device when using some of the alternate network types. You can alsouse --model option to change the model of network interface that is presented to the virtual machine. Bydefault, the virtio model is used, but alternate models, such as e1000 or rtl8139 are available, Runvirsh help attach-interface for more information, or refer to the VIRSH(1) man page.

Remove a vNIC from a virtual machine using the virsh detach-interface command. For example, run:

virsh detach-interface --domain guest --type network --mac 52:54:00:41:6a:65 --config

Note that the domain or virtual machine name and type are required parameters. If the virtual machinehas more than one vNIC attached, you must specify the mac parameter to provide the MAC address of thevNIC that you wish to remove. You can obtain this value by listing the vNICs that are currently attached toa virtual machine. For example, you can run:

virsh domiflist guest

Output:

Interface Type Source Model MAC-------------------------------------------------------

27

Bridged and Direct vNICs

vnet0 network default virtio 52:54:00:8c:d2:44vnet1 network default virtio 52:54:00:41:6a:65

3.6.3 Bridged and Direct vNICs

Bridged vNICs are simple to configure and allow a virtual machine's network to act independently to thehost's network configuration by sharing the same physical network interface to connect to the existingnetwork infrastructure. This can reduce complexity and is relatively easy to manage.

Traditional network bridging using linux bridges is supported using the bridge type when attaching aninterface. The virsh iface-bridge command can be used to create a bridge on the host system and add aphysical interface to it. For example, to create a bridge named vmbridge1 with the Ethernet port namedenp0s31f6 attached, you can run:

virsh iface-bridge vmbridge1 enp0s31f6

Once the bridge is created, you can attach it using the virsh attach-interface command asdescribed in Section 3.6.2, “Adding or Removing a vNIC”.

There are several issues that you may need to be aware of when using traditional linux bridged networkingfor KVM guests. For instance, it is not simple to set up a bridge on a wireless interface due to the numberof addresses available in 802.11 frames. Furthermore, the complexity of the code to handle softwarebridges can result in reduced throughput, increased latency and additional configuration complexity. Themain advantage that this approach offers, is that it allows the host system to communicate across thenetwork stack directly with any guests configured to use bridged networking.

Most of the issues related to using traditional linux bridges can be easily overcome by using the macvtapdriver which simplifies virtualized bridge network significantly. For most bridged network configurations inKVM, this is the preferred approach because it offers better performance and it is easier to configure. Themacvtap driver is used when the network type is set to direct.

The macvtap driver creates endpoint devices that follow the tun/tap ioctl interface model to extend anexisting network interface so that KVM can use it to connect to the physical network interface directly tosupport different network functions. These functions can be controlled by setting a different mode for theinterface. The following modes are available:

• vepa (Virtual Ethernet Port Aggregator) is the default mode and forces all data from a vNIC out of thephysical interface to a network switch. If the switch supports hairpin mode, different vNICs connectedto the same physical interface are able to communicate via the switch. Many switches currently do notsupport hairpin mode, which means that virtual machines with direct connection interfaces running inVEPA mode are unable to communicate, but can connect to the external network via the switch.

• bridge mode connects all vNICS directly to each other so that traffic between virtual machines usingthe same physical interface is not sent out to the switch and is facilitated directly. This is the mostuseful option when using switches that do not support hairpin mode, and when you need maximumperformance for communications between virtual machines. It is important to note that when configuredin this mode, unlike a traditional software bridge, the host is unable to use this interface to communicatedirectly with the virtual machine.

• private mode behaves like a VEPA mode vNIC in the absence of a switch supporting hairpin mode.However, even if the switch does support hairpin mode, two virtual machines connected to the samephysical interface are unable to communicate with each other. This option has limited use cases.

• passthrough mode attaches a physical interface device or an SR-IOV Virtual Function (VF) directly tothe vNIC without losing the migration capability. All packets are sent directly to the configured networkdevice. There is a one-to-one mapping between network devices and virtual machines when configured

28

Interface Bonding for Bridged Networks

in passthrough mode because a network device cannot be shared between virtual machines in thisconfiguration.

Unfortunately, the virsh attach-interface command does not allow you to specify the differentmodes available when attaching a direct type interface that uses the macvtap driver and defaultsto vepa mode . The graphical virt-manager utility makes setting up bridged networks using macvtapsignificantly easier and provides options for each different mode.

Nonetheless, it is not very difficult to change the configuration of a virtual machine by editing the XMLdefinition for it directly. The following steps can be followed to configure a bridged network using themacvtap driver on an existing virtual machine:

1. Attach a direct type interface to the virtual machine using the virsh attach-interfacecommand and specify the source for the physical interface that should be used for the bridge. In thisexample, the virtual machine is called guest1 and the physical network interface on the host is awireless interface called wlp4s0:

virsh attach-interface --domain guest1 --type direct --source wlp4s0 --config

2. Dump the XML for the virtual machine configuration and copy it to a file that you can edit:

virsh dumpxml guest1 > /tmp/guest1.xml

3. Edit the XML for the virtual machine to change the vepa mode interface to use bridged mode. If thereare many interfaces connected to the virtual machine, or you wish to review your changes, you can dothis in a text editor. If you are happy to make this change globally, run:

sed -i "s/mode='vepa'/mode='bridge'/g" /tmp/guest1.xml

4. Remove the existing configuration for this virtual machine and replace it with the modified configurationin the XML file:

virsh undefine guest1virsh define /tmp/guest1.xml

5. Restart the virtual machine for the changes to take affect. The direct interface is attached in bridgemode and is persistent and automatically started when the virtual machine boots.

3.6.4 Interface Bonding for Bridged Networks

The use of bonded interfaces for higher throughput is common where hosts may run several concurrentvirtual machines that are providing multiple services at once. Where a single physical interface may haveprovided sufficient bandwidth for applications hosted on a physical server, the increase in network trafficwhen running multiple virtual machines can have a negative impact on network performance where asingle physical interface is shared. By using bonded interfaces, the throughput capability for your virtualmachines can be increased significantly and you are able to also take advantage of the high availabilityfeatures that come with a network bond.

Since the physical network interfaces that a virtual machine may use are located on the host and not onthe virtual machine, setting up any form of bonded networking for greater throughput or for high availability,must be configured on the host system, itself. This approach allows you to configure network bonds on thehost and then to attach a virtual network interface, using a network bridge, directly to the bonded networkon the host.

Network bonding of physical interfaces for Oracle Linux 7 is described in Oracle® Linux 7: Setting UpNetworking. For Oracle Linux 8, see Oracle® Linux 8: Setting Up Networking. To achieve HA networkingfor you virtual machines, you should configure a network bond on the host system first.

29

Cloning Virtual Machines

When the bond is configured, you should configure your virtual machine networks to use the bondedinterface when you create a network bridge. This can be done using either the bridge type interface orusing a direct interface configured to use the macvtap driver's bridge mode. The bond interface canbe used instead of a physical network interface when configuring a virtual network interface.

3.7 Cloning Virtual Machines

You can use two types of virtual machine instances to create copies of virtual machines:

• Clone

A clone is an instance of a single virtual machine. You can use a clone to set up a network of identicalvirtual machines which you can optionally distribute to other destinations.

• Template

A template is an instance of a virtual machine that you can use as the cloning source. You can use atemplate to create multiple clones and optionally make modifications to each clone.

The difference between clones and templates is how they are used. For the created clone to work properly,ensure that you remove information and modify configurations unique to the virtual machine that is beingcloned before cloning. This information and configurations differs based on how you will use the clones, forexample:

• anything assigned to the virtual machine such as the number of Network Interface Cards (NICs) andtheir MAC addresses.

• anything configured within the virtual machine such as SSH keys.

• anything configured by an application installed on the virtual machine such as activation codes andregistration information.

You must remove some of the information and configurations from within the virtual machine. Otherinformation and configurations must be removed from the virtual machine using the virtualizationenvironment.

3.7.1 Preparing a Virtual Machine for Cloning

Before cloning a virtual machine, you must prepare it by running the virt-sysprep utility on its diskimage or by completing the following steps.

Note

For more information on how to use the virt-sysprep utility to prepare a virtualmachine and understand the available options, see https://libguestfs.org/virt-sysprep.1.html.

1. Build the virtual machine that you want to use for the clone or template.

a. Install any needed software.

b. Configure any non-unique operating system and application settings.

2. Remove any persistent or unique network configuration details.

a. Run the following command to remove any persistent udev rules:

30

Preparing a Virtual Machine for Cloning

rm -f /etc/udev/rules.d/70-persistent-net.rules

Note

If you do not remove the udev rules, the name of the first NIC might beeth1instead of eth0.

b. Modify /etc/sysconfig/network-scripts/ifcfg-eth[x] to remove the HWADDR and staticlines as well as any other unique or non-desired settings, such as UUID, for example:

DEVICE=eth[x]BOOTPROTO=noneONBOOT=yes

#NETWORK=10.0.1.0 <- REMOVE#NETMASK=255.255.255.0 <- REMOVE#IPADDR=10.0.1.20 <- REMOVE#HWADDR=xx:xx:xx:xx:xx <- REMOVE#USERCTL=no <- REMOVE

After modification, your file should not include a HWADDR entry or any unique information, and at aminimum include the following lines:

DEVICE=eth[x]ONBOOT=yes

Important

You must remove the HWADDR entry because if its address does not matchthe new guest's MAC address, the ifcfg is ignored.

c. If you have /etc/sysconfig/networking/profiles/default/ifcfg-eth[x] and /etc/sysconfig/networking/devices/ifcfg-eth[x] files, ensure they have the same content asthe /etc/sysconfig/network-scripts/ifcfg-eth[x] file.

Note

Ensure that any additional unique information is removed from the ifcfgfiles.

3. If the guest virtual machine from which you want to create a clone is registered with ULN, you must de-register it. For more information, see the Unbreakable Linux Network User's Guide for Oracle Linux 6and Oracle Linux 7.

4. Run the following command to remove any sshd public/private key pairs:

rm -rf /etc/ssh/ssh_host_*

Note

Removing ssh keys prevents problems with ssh clients not trusting these hosts.

5. Remove any other application-specific identifiers or configurations that might cause conflicts if runningon multiple machines.

6. Configure the virtual machine to run the relevant configuration wizards the next time it boots.

• For Oracle Linux 6 and below, run the following command to create an empty file on the root filesystem called .unconfigured:

31

Cloning a Virtual Machine by Using the virt-clone Command

touch /.unconfigured

• For Oracle Linux 7, run the following commands to enable the first boot and initial-setup wizards:

sed -ie 's/RUN_FIRSTBOOT=NO/RUN_FIRSTBOOT=YES/' /etc/sysconfig/firstbootsystemctl enable firstboot-graphicalsystemctl enable initial-setup-graphical

Note

The wizards that run on the next boot depend on the configurations that havebeen removed from the virtual machine. Also, on the first boot of the clone werecommend that you change the hostname.

Important

Before proceeding with cloning, shut down the virtual machine. You can clone avirtual machine using virt-clone or virt-manager.

3.7.2 Cloning a Virtual Machine by Using the virt-clone Command

You can use virt-clone to clone virtual machines from the command line; however, you need rootprivileges for virt-clone to complete successfully. The virt-clone command provides a number ofoptions that can be passed on the command line, which include general, storage configuration, networkingconfiguration, and other miscellaneous options. Only the --original is required.

Run virt-clone --help to see a complete list of options, or refer to the VIRT-CLONE(1) man page.

Run the following command to clone a virtual machine on the default connection, automatically generatinga new name and disk clone path:

virt-clone --original vm-name --auto-clone

Run the following command to clone a virtual machine with multiple disks:

virt-clone --connect qemu:///system --original vm-name --name vm-clone-name \--file /var/lib/libvirt/images/vm-clone-name.img --file /var/lib/libvirt/images/vm-clone-data.img

3.7.3 Cloning a Virtual Machine by Using Virtual Machine Manager

Complete the following steps to clone a guest virtual machine using Virtual Machine Manager.

1. Start Virtual Machine Manager in one of the following ways:

• Launch Virtual Machine Manager from the System Tools menu.

• Run the virt-manager command as root.

2. From the list of guest virtual machines, right-click the guest virtual machine you want to clone and clickClone.

The Clone Virtual Machine window opens.

3. In the Name field, change the name of the clone or accept the default name.

4. To change the Networking information, click Details. Then, enter a new MAC address for the cloneand click OK.

32

Cloning a Virtual Machine by Using Virtual Machine Manager

5. For each disk in the cloned guest virtual machine, select one of the following options:

• Clone this disk - The disk is cloned for the cloned guest virtual machine.

• Share disk with guest-virtual-machine-name - The disk is shared by the guest virtualmachine to be cloned and its clone.

• Details - Opens the Change storage path window if you want to select a new path for the disk.

6. Click Clone.

33

34

Chapter 4 Known Issues for Oracle Linux KVM

Table of Contents4.1 Upgrading From QEMU 3.10 to Version 4.2.1 Can Prevent Existing KVM Guests From Starting onOracle Linux 7 ................................................................................................................................. 354.2 QEMU Does Not Support Video Device Error on Oracle KVM Stack .............................................. 35

This chapter provides information about known issues for Oracle Linux KVM. If a workaround is available,that information is also provided.

4.1 Upgrading From QEMU 3.10 to Version 4.2.1 Can PreventExisting KVM Guests From Starting on Oracle Linux 7

Attempting to upgrade a KVM host from QEMU version 3.10 to version 4.2.1 results in a libvirt servererror that can prevent existing KVM guests from starting on an Oracle Linux 7 host.

An error similar to the following is displayed:

Upgrade qemu-3.1.0-7.el7.x86_64 to qemu-4.2.1-4.el7.x86_64, kvm can not bestarted, got below libvirt service error:

Dec 21 15:10:48 ca-ex05db01.us.oracle.com libvirtd[23588]: Unable to readfrom monitor: Connection reset by peerDec 21 15:10:48 ca-ex05db01.us.oracle.com libvirtd[23588]: internal error:qemu unexpectedly closed the monitor: 2020-12-21T23:10:48.306929Zqemu-system-x86_64: We need to set caching-mode=on for intel-iommu to enabledevice assignment with IOMMU protection.Dec 21 15:10:52 ca-ex05db01.us.oracle.com libvirtd[23588]: internal error:Failed to autostart VM 'ca-ex05db01vm01.us.oracle.com': internal error: qemuunexpectedly closed the monitor: 2020-12-21T23:10:48.306929Zqemu-system-x86_64: We need to set caching-mode=on for intel-iommu to enabledevice assignment with IOMMU protection.Dec 21 15:10:52 ca-ex05db01.us.oracle.com libvirtd[23588]: nl_recv returnedwith error: No buffer space available

To work around this issue so that KVM guests can run the updated qemu version, edit the XML file ofeach KVM guest, adding the caching_mode='on' parameter to the iommu section for each driver sub-element, as shown in the following example:

<iommu model='intel'> <driver aw_bits='48' caching_mode='on'/> </iommu>

(Bug ID 32312933)

4.2 QEMU Does Not Support Video Device Error on Oracle KVMStack

When using the Oracle KVM Stack in the virt:uek stream, virt-manager may fail to create a virtualmachine and returns the following error:

libvirt.libvirtError: unsupported configuration: this QEMU does not support'qxl' video device

The default video emulator used by virt-manager is not available in the Oracle KVM stack.

35

QEMU Does Not Support Video Device Error on Oracle KVM Stack

To work around this issue, run virt-manager with the --nographics option.

(Bug ID 32801350)

36

Chapter 5 Oracle VirtIO Drivers for Microsoft Windows

Table of Contents5.1 What's New ................................................................................................................................ 375.2 Supported Releases, Operating Systems, and Configuration Limits ............................................... 37

5.2.1 Supported Environments .................................................................................................. 385.2.2 Supported Guest Operating Systems ................................................................................ 385.2.3 Microsoft Windows Compatibility Signing .......................................................................... 39

5.3 Downloading the Oracle VirtIO Drivers for Microsoft Windows ....................................................... 405.4 Installing the Oracle VirtIO Drivers for Microsoft Windows ............................................................. 40

5.4.1 Installing the Oracle VirtIO Drivers for Microsoft Windows on Existing Microsoft WindowsGuests ..................................................................................................................................... 415.4.2 Installing the Oracle VirtIO Drivers for Microsoft Windows During Microsoft Windows GuestInstallation ................................................................................................................................ 435.4.3 Optional Configuration Changes ....................................................................................... 44

5.5 Upgrading the Oracle VirtIO Drivers for Microsoft Windows .......................................................... 455.6 Silently Installing or Upgrading the Oracle VirtIO Drivers for Microsoft Windows ............................. 465.7 Uninstalling the Oracle VirtIO Drivers for Microsoft Windows ......................................................... 475.8 Known Limitations and Workarounds ........................................................................................... 48

5.8.1 Security Alert for Unsigned Drivers ................................................................................... 485.8.2 Found New Hardware Wizard Displayed ........................................................................... 505.8.3 Microsoft Windows Server 2012 Data Center Guests With Failover Clustering Cannot GetIP Address ............................................................................................................................... 50

The Oracle VirtIO Drivers for Microsoft Windows are paravirtualized drivers for Microsoft Windows gueststhat are running on KVM hypervisors; these drivers improve performance for network and block (disk)devices on Microsoft Windows guests and resolve common issues.

The following instructions describe how to install, use, and troubleshoot the Oracle VirtIO Drivers forMicrosoft Windows. Note that these instructions are intended for users and administrators of gueststhat are running the Microsoft Windows operating system in virtualized environments, where KVM is thehypervisor.

5.1 What's New

Included in release 1.1.7 of the Oracle VirtIO Drivers for Microsoft Windows is an update for the pvpanicdriver to enable better support for both modes of operation to inform the host of a panic or crash dumpbeing performed in a Windows virtual machine. The pvpanic driver triggers the event to notify the hostwhen the Windows guest crashes. Depending on the QEMU version installed on the host and the Windowssystem version, either PVPANIC_PANICKED or PVPANIC_CRASHLOADED is sent.

Release 1.1.7 also includes a fix to the installer to fully remove older versions of the Oracle VirtIO Driversfor Microsoft Windows drivers.

5.2 Supported Releases, Operating Systems, and ConfigurationLimits

The following information pertains to the Oracle Linux and Oracle Cloud Infrastructure releases that aresupported with the Oracle VirtIO Drivers for Microsoft Windows, in addition to the supported operatingsystems for each version of the Oracle VirtIO Drivers for Microsoft Windows.

37

Supported Environments

Information about Microsoft Windows compatibility signing and details on tested and recommendedconfiguration limits for the Oracle VirtIO Drivers for Microsoft Windows is also provided.

5.2.1 Supported Environments

The following environments and platforms provide support for the Oracle VirtIO Drivers for MicrosoftWindows Release 1.1.7:

• Oracle Cloud Infrastructure

• Oracle Linux 7

5.2.2 Supported Guest Operating Systems

The following table lists the supported Microsoft Windows operating systems for the Oracle VirtIO Driversfor Microsoft Windows.

Table 5.1 Microsoft Windows Supported Guest Operating Systems

Guest Operating System with Oracle VirtIO Drivers for MicrosoftWindows Installed

64-bit 32-bit

Microsoft Windows Server 2019 Yes N/A

Microsoft Windows Server 2016 Yes N/A

Microsoft Windows Server 2012 R2 Yes N/A

Microsoft Windows Server 2012 Yes N/A

Microsoft Windows Server 2008 R2 SP1

Note

This operating system is supported only whenthe following Microsoft hotfixes are applied:

• https://support.microsoft.com/en-us/help/983554

• https://support.microsoft.com/en-us/help/2957775

• https://support.microsoft.com/en-us/help/4474419

Yes N/A

Microsoft Windows Server 2008 SP2

Note

This operating system is supported only whenthe following Microsoft hotfixes are applied:

• https://support.microsoft.com/en-us/help/983554

• https://support.microsoft.com/en-us/help/4474419

Yes Yes

Microsoft Windows Server 2003 R2 SP2 Yes Yes

38

Microsoft Windows Compatibility Signing

Guest Operating System with Oracle VirtIO Drivers for MicrosoftWindows Installed

64-bit 32-bit

Microsoft Windows 10 Yes Yes

Microsoft Windows 8.1 Yes Yes

Microsoft Windows 8 Yes Yes

Microsoft Windows 7 SP1 Yes Yes

Microsoft Windows Vista SP2 Yes Yes

Note

For information about the supported Microsoft Windows operating systems forthe Oracle VirtIO Drivers for Microsoft Windows in the Oracle Cloud Infrastructureenvironment, see https://docs.oracle.com/en-us/iaas/Content/Compute/References/bringyourownimage.htm.

Virtual Machine Configuration

Virtual machine configuration for the Oracle VirtIO Drivers for Microsoft Windows complies with shapeconfigurations for virtual machines in the Oracle Cloud Infrastructure environment. For more information,see: https://www.oracle.com/cloud/compute/virtual-machines/.

5.2.3 Microsoft Windows Compatibility Signing

The following table shows the Microsoft Windows operating systems for which the Oracle VirtIO Drivers forMicrosoft Windows have been signed and certified. Oracle has also tested the drivers to ensure they workas expected. Additional information on the certifications can be found at the Windows Server Catalog.

Table 5.2 Microsoft Windows Compatibility Signing

Guest Operating System Signed and Certified by Microsoft Tested by Oracle toOperate Successfully

Microsoft Windows Server 2019 Yes Yes

Microsoft Windows Server 2016 Yes Yes

Microsoft Windows Server 2012 R2 Yes Yes

Microsoft Windows Server 2012 Yes Yes

Microsoft Windows Server 2008 R2SP1

Yes Yes

Microsoft Windows Server 2008 SP2(32- and 64-bit)

Yes

Important

All binariesare signedby Microsoftexcept for thepvpanic driverbinaries.

Yes

Microsoft Windows Server 2003 R2SP2

No Yes

Microsoft Windows 10 No Yes

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Downloading the Oracle VirtIO Drivers for Microsoft Windows

Guest Operating System Signed and Certified by Microsoft Tested by Oracle toOperate Successfully

Microsoft Windows 8.1 No Yes

Microsoft Windows 8 No Yes

Microsoft Windows 7 SP1 No Yes

Microsoft Windows Vista SP2 No Yes

Note

A security alert occurs during installation on a Windows operating system for whichOracle VirtIO Drivers for Microsoft Windows are not signed.

5.3 Downloading the Oracle VirtIO Drivers for Microsoft Windows

Before you can install the Oracle VirtIO Drivers for Microsoft Windows you must download them fromOracle Software Delivery Cloud or My Oracle Support (MOS).

To download the Oracle VirtIO Drivers for Microsoft Windows from Oracle Software Delivery Cloud:

1. Navigate to https://edelivery.oracle.com and log in.

2. Search for Oracle Linux.

3. Select DLP: Oracle Linux 7.9.0.0.0 (Oracle Linux).

4. Click Continue.

5. In the Platforms / Languages column, select x86 64 bit in the drop-down list and then click Continue.

6. Review and accept the Oracle License Agreement and then click Continue.

7. Click the V1009702-01.zip file name, Oracle VirtIO Drivers for Microsoft Windows, Version1.1.7, 67.90 MB, and save it to your system.

To download the Oracle VirtIO Drivers for Microsoft Windows from MOS:

1. From the MOS home page, click the Patches & Updates tab.

2. From the Patch Search options, in the Patch Name or Number field enter 27637937 and then clickSearch.

3. From the search results table, click the 27637937 Patch Name that corresponds to the Oracle VirtIODrivers for Microsoft Windows, Version 1.1.7.

4. From the Patch Details page, click Download.

The File Download window opens.

5. Click the p27637937_79000_MSWIN-x86-64.zip file and save it to your system.

5.4 Installing the Oracle VirtIO Drivers for Microsoft Windows

Installing the Oracle VirtIO Drivers for Microsoft Windows involves configuring Microsoft Windows policies,running the installation program, and then verifying the installation.

40

Installing the Oracle VirtIO Drivers for Microsoft Windows on Existing Microsoft Windows Guests

5.4.1 Installing the Oracle VirtIO Drivers for Microsoft Windows on ExistingMicrosoft Windows Guests

To install the Oracle VirtIO Drivers for Microsoft Windows on existing Microsoft Windows guests, performthe following procedures.

5.4.1.1 Configuring Policies for Device Installation

Configure Microsoft Windows policies to allow the installation of the Oracle VirtIO Drivers for MicrosoftWindows, if these policies are not already configured. This task prevents the following error from occurringduring an installation:

The installation of this device is forbidden by system policy. Contact your system administrator.

To configure policies for installation:

1. Open the Microsoft Windows virtual machine on which you want to install the Oracle VirtIO Drivers forMicrosoft Windows.

2. From the Start menu, select Run.

3. Enter gpedit.msc and then click OK.

The Local Group Policy Editor is displayed.

4. From the Console Tree, display the list of device installation restrictions (Device InstallationRestrictions) as follows:

a. Expand Computer Configuration, and then expand Administrative Templates.

b. Expand System, and then expand Device Installation.

c. Select Device Installation Restrictions.

5. Edit the policy settings so that no device installation restrictions are configured.

Alternatively, review each policy setting to determine the correct configuration for your business needs.

6. Close the Local Group Policy Editor.

7. Restart the Microsoft Windows virtual machine.

When you are finished configuring the policy settings for device installation, you can proceed with theinstallation of the Oracle VirtIO Drivers for Microsoft Windows.

5.4.1.2 Installing Oracle VirtIO Drivers for Microsoft Windows

Before You Begin. Do the following before you start the installation process:

• Obtain the Oracle VirtIO Drivers for Microsoft Windows from Oracle Software Delivery Cloud or MOS.See Section 5.3, “Downloading the Oracle VirtIO Drivers for Microsoft Windows”.

• Review the list of supported Microsoft Windows operating systems and any prerequisite hotfixes. SeeSection 5.2.2, “Supported Guest Operating Systems”.

• Configure system policies to allow the installation. See Section 5.4.1.1, “Configuring Policies for DeviceInstallation”.

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Installing the Oracle VirtIO Drivers for Microsoft Windows on Existing Microsoft Windows Guests

Note

If you are migrating Windows guests from Oracle Cloud Infrastructure Classicto Oracle Cloud Infrastructure, the installer copies the Oracle VirtIO Drivers forMicrosoft Windows files, installs the drivers on the guest, and configures the guestto support migration from Oracle Cloud Infrastructure Classic to Oracle CloudInfrastructure.

You can install the Oracle VirtIO Drivers for Microsoft Windows by using the GUI installation program or byperforming a silent installation. Use the graphical installation program if you are installing a single instanceof the Oracle VirtIO Drivers for Microsoft Windows. If you plan to silently install multiple instances of theOracle VirtIO Drivers for Microsoft Windows, you must run the GUI installation program in a command-linewindow on at least one Microsoft Windows guest to create a response file. You can then use the responsefile to perform all of the subsequent installations silently.

To install the Oracle VirtIO Drivers for Microsoft Windows:

1. Copy the Oracle VirtIO Drivers for Microsoft Windows installation program Setup.exe to the guest.

2. Start the installation by running Setup.exe in one of the following ways:

• To perform a single installation, double-click Setup.exe to start the Oracle VirtIO Drivers forMicrosoft Windows installer.

• To record a response file for automated installations on multiple systems:

a. Open a command line window.

b. Navigate to the directory where the Setup.exe file is located.

c. Run Setup.exe -r to start the Oracle VirtIO Drivers for Microsoft Windows installer and createa response file for silent installations.

3. If prompted, select Yes in the User Account Control dialog to allow the Oracle VirtIO Drivers forMicrosoft Windows installer to proceed.

The Welcome window is displayed.

4. Click Next.

The Start to install Oracle VirtIO Drivers for Microsoft Windows Release 1.1.7 window is displayedwith information about your selection.

5. Click Install to start the installation.

The installer copies the Oracle VirtIO Drivers for Microsoft Windows files and installs the drivers on theguest.

6. Once the installation completes, click Finish.

The virtual machine is restarted.

Note

If you are migrating Windows guests from Oracle Cloud Infrastructure Classicto Oracle Cloud Infrastructure, shut down the Windows guest VM in the OracleCloud Infrastructure Classic environment and then start the Windows guest VMin the Oracle Cloud Infrastructure environment.

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Installing the Oracle VirtIO Drivers for Microsoft Windows During Microsoft Windows Guest Installation

The Oracle VirtIO Drivers for Microsoft Windows are installed in the following directories:

• On 32-bit systems: C:\Program Files\Oracle Corporation\Oracle Windows VirtIODrivers

• On 64-bit systems: C:\Program Files (x86)\Oracle Corporation\Oracle WindowsVirtIO Drivers

If you used the -r option in the command line, the installation program creates a response file in the C:\Windows directory. You then use the response file, setup.iss, to perform silent installations on otherMicrosoft Windows guests. See Section 5.6, “Silently Installing or Upgrading the Oracle VirtIO Drivers forMicrosoft Windows”.

5.4.2 Installing the Oracle VirtIO Drivers for Microsoft Windows DuringMicrosoft Windows Guest Installation

Before You Begin. Do the following before you start the installation process:

• Obtain the Oracle VirtIO Drivers for Microsoft Windows from Oracle Software Delivery Cloud or MOS.See Section 5.3, “Downloading the Oracle VirtIO Drivers for Microsoft Windows”.

• Review the list of supported Microsoft Windows operating systems and any prerequisite hotfixes. SeeSection 5.2.2, “Supported Guest Operating Systems”.

To install the Oracle VirtIO Drivers for Microsoft Windows during the installation of a Microsoft Windowsguest, do the following:

1. Create the virtual machine, but do not start it.

2. Attach the Oracle VirtIO Drivers for Microsoft Windows ISO file to the virtual machine as an emulatedIDE device. You can find the winvirtio.iso file in the Oracle VirtIO Drivers for Microsoft Windowszip file you downloaded.

Ensure that the Microsoft Windows installation ISO is attached to the virtual machine as the first IDEdevice. The Oracle VirtIO Drivers for Microsoft Windows ISO file should be the second IDE device.

3. Start the virtual machine and begin the Microsoft Windows installation process.

4. When the disk or partition screen displays, follow the prompts to browse and load drivers.

5. Navigate to the appropriate driver location on the Oracle VirtIO Drivers for Microsoft Windows ISO fileand then select them.

The contents of the Oracle VirtIO Drivers for Microsoft Windows ISO file are as follows:

autorun.inf # File that automatically runs the installation program.Setup.exe # The main graphical installation program.NetKVM # Directory that contains the license file for NetKVM drivers.pvpanic # Directory that contains the license file for pvpanic drivers.vioscsi # Directory that contains the license file for vioscsi drivers.vioserial # Directory that contains the license file for vioserial drivers.viostore # Directory that contains the license file for viostore drivers.vio # Base directory for drivers.

vio/Win10 # Drivers for Windows 10, Windows Server 2016, and Windows Server 2019.vio/Win10/amd64 # 64-bit drivers.vio/Win10/i386 # 32-bit drivers. {only Windows 10)

vio/Win8.1 # Drivers for Windows 8.1 and Windows Server 2012 R2.

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Optional Configuration Changes

vio/Win8.1/amd64 # 64-bit drivers.vio/Win8.1/i386 # 32-bit drivers. (only Windows 8.1)

vio/Win8 # Drivers for Windows 8 and Windows Server 2012.vio/Win8/amd64 # 64-bit drivers.vio/Win8/i386 # 32-bit drivers. (only Windows 8)

vio/Win7 # Drivers for Windows 7 and Windows Server 2008 R2.vio/Win7/amd64 # 64-bit drivers.vio/Win7/i386 # 32-bit drivers.

vio/Wlh # Drivers for Windows Vista and Windows Server 2008 (Longhorn).vio/Wlh/amd64 # 64-bit drivers.vio/Wlh/i386 # 32-bit drivers.

vio/Wnet # Drivers for Windows Server 2003 R2.vio/Wnet/amd64 # 64-bit drivers.vio/Wnet/i386 # 32-bit drivers.

6. Repeat the preceding step to install additional drivers as necessary and then continue with theMicrosoft Windows installation process.

After you install the Microsoft Windows guest, you must configure Microsoft Windows policies. SeeSection 5.2.2, “Supported Guest Operating Systems”.

5.4.3 Optional Configuration Changes

This section describes optional changes that can be made to the configuration after installation iscomplete.

Note

The optional configuration changes are only relevant if you completed a Defaulttype of installation, are running Oracle Linux, and have control of the host system. Ifyou have completed a Custom installation and migrated your VM from the OCI-C toOracle Cloud Infrastructure environment, you do not have access to the host.

The changes that are described here require that the host system is running the latest supportedvirtualization packages, which are available in the ol7_kvm_utils Yum repository on the Oracle Linuxyum server or in the ol7_x86_64_kvm_utils or ol7_aarch64_kvm_utils channels on ULN.

If you have not already done so, enable the appropriate channel or repository and install the packagesfrom this location before proceeding. See Section 2.1, “Configuring Yum Repositories and ULN Channels”for more information. If you perform an upgrade of the virtualization packages, you might need to restartany running virtual machines for the changes to take effect.

5.4.3.1 Configuring Block Drivers

The Oracle VirtIO Drivers for Microsoft Windows provide block drivers that improve disk performance onMicrosoft Windows guests. However, guests do not automatically start by using the Oracle VirtIO Driversfor Microsoft Windows storage drivers after installation. As a result, guests cannot use the paravirtualizedstorage drivers for boot disks. You must configure each guest to use paravirtualized storage drivers insteadof emulated disks after installation.

To configure block drivers after installation:

1. Ensure you have installed the Oracle VirtIO Drivers for Microsoft Windows.

2. Stop the guest if it is running.

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Upgrading the Oracle VirtIO Drivers for Microsoft Windows

3. Create a new temporary image that you can add to the guest as a second disk. For example, run:

sudo qemu-img create -f qcow2 disk_name.qcow2 1G

4. Add the disk you created to the guest.

5. Specify virtio as the bus type for the disk you added and then start the guest. Microsoft Windows willlocate the disk drivers and complete the installation at this point.

6. Change the bus type for the boot disk to virtio and then start the guest.

Microsoft Windows then installs the Oracle VirtIO Drivers for Microsoft Windows block driver on theboot disk.

7. Detach the temporary disk from the guest.

5.4.3.2 Setting the MTU Size for Virtual Machines

The Oracle VirtIO Drivers for Microsoft Windows override the maximum transmission unit (MTU) settingsin the virtual network adapters for Microsoft Windows guests. After you have successfully installed andverified the Oracle VirtIO Drivers for Microsoft Windows, set the MTU for each guest as follows:

1. Open the Microsoft Windows virtual machine.

2. Open the control panel, then locate and open the Device Manager window.

3. Expand Network adapters and select the appropriate Oracle VirtIO Ethernet Adapter.

4. Right-click the adapter, select Properties, and then select the Advanced tab.

5. Select the MTU property and set the value as appropriate.

6. Click OK to save your changes.

5.5 Upgrading the Oracle VirtIO Drivers for Microsoft Windows

You can upgrade an existing installation of the Oracle VirtIO Drivers for Microsoft Windows by using theGUI installation program or by performing a silent upgrade. Use the graphical installation program if youare upgrading a single instance of the Oracle VirtIO Drivers for Microsoft Windows. If you plan to silentlyupgrade multiple instances of the Oracle VirtIO Drivers for Microsoft Windows, you must run the graphicalinstallation program in a command-line window on at least one Microsoft Windows guest to create aresponse file. You can then use the response file to perform all subsequent upgrades silently.

To upgrade the Oracle VirtIO Drivers for Microsoft Windows:

1. Copy the Oracle VirtIO Drivers for Microsoft Windows installation program, Setup.exe, to the guest.

2. Do one of the following:

• Double click Setup.exe to begin the upgrade.

• Open a command line window and then do the following:

a. Navigate to the directory where the Setup.exe file is located.

b. Run the Setup.exe -r command to begin the upgrade and create a response file for silentinstallations.

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Silently Installing or Upgrading the Oracle VirtIO Drivers for Microsoft Windows

3. If prompted, select Yes in the User Account Control dialog to allow the Oracle VirtIO Drivers forMicrosoft Windows installer to proceed.

Figure 5.1 Oracle VirtIO Drivers for Microsoft Windows user account control dialog

The initial upgrade window is displayed.

4. Click Next to start the upgrade.

The installation program then copies new versions of the Oracle VirtIO Drivers for Microsoft Windows tothe system and updates the installed drivers. The Update Complete window is displayed.

5. Click Yes, I want to restart the system now and then click Finish to restart the virtual machine.

If you used the -r option in the command line, the installation program creates a response file in the C:\Windows directory. You then use the response file, setup.iss, to perform silent upgrades on otherMicrosoft Windows guests. See Section 5.6, “Silently Installing or Upgrading the Oracle VirtIO Drivers forMicrosoft Windows”.

5.6 Silently Installing or Upgrading the Oracle VirtIO Drivers forMicrosoft Windows

You can use a response file that you create with the graphical installation program to silently install orupgrade the Oracle VirtIO Drivers for Microsoft Windows. The response file provides the prompts thatthe installation program requires to successfully install or upgrade the Oracle VirtIO Drivers for MicrosoftWindows.

Important

• Oracle VirtIO Drivers for Microsoft Windows must be signed by Microsoft toperform a silent installation or upgrade. See Section 5.2.3, “Microsoft WindowsCompatibility Signing”.

• You can perform a silent installation or upgrade only on 64-bit versions ofMicrosoft Windows later than Windows Vista. You cannot perform a silentinstallation or upgrade on any 32-bit version of Microsoft Windows or MicrosoftWindows 2003 (32-bit or 64-bit).

To install or upgrade the Oracle VirtIO Drivers for Microsoft Windows silently:

46

Uninstalling the Oracle VirtIO Drivers for Microsoft Windows

1. Complete at least one installation or upgrade of the Oracle VirtIO Drivers for Microsoft Windows byusing the GUI installation program to create a response file. See Section 5.4.1.2, “Installing OracleVirtIO Drivers for Microsoft Windows” or Section 5.5, “Upgrading the Oracle VirtIO Drivers for MicrosoftWindows”.

2. Locate the response file, setup.iss, in the C:\Windows directory on the file system of the computerwhere you ran the graphical installation program.

3. Copy setup.iss to the same directory as the Oracle VirtIO Drivers for Microsoft Windows installationprogram. Alternatively you can specify the location of the response file at the command line.

4. Open a command-line window.

5. Run the Setup.exe -s command to silently install or upgrade the Oracle VirtIO Drivers for MicrosoftWindows with the response file.

You can include the following options at the command line:

• -f1c:path\to\setup.iss to specify the location of setup.iss.

For example, Setup.exe -s -f1c:\Users\Username\setup.iss.

• -f2c:path\to\setup.log to specify the location of setup.log. By default, log filesare written to the C:\Windows directory, for example, Setup.exe -s -f2c:\Users\Username\setup.log.

5.7 Uninstalling the Oracle VirtIO Drivers for Microsoft Windows

You can uninstall the Oracle VirtIO Drivers for Microsoft Windows through the Microsoft Windows controlpanel or by running the installation program that you used to install the Oracle VirtIO Drivers for MicrosoftWindows.

To uninstall through the Microsoft Windows control panel:

1. Open the control panel and navigate to the Uninstall or change a program section.

Note that the name of this section might be different, depending on your version of Microsoft Windows.

2. Locate, then select the Oracle VirtIO Drivers for Microsoft Windows.

3. Right-click the Uninstall option.

The installation program starts and prompts you to confirm the uninstallation.

4. Select Yes when prompted to remove the application.

The installation program removes the Oracle VirtIO Drivers for Microsoft Windows and deletes thebinaries from your system.

5. When prompted, select Yes, restart the system and then click Finish to complete the uninstallation.

To uninstall with the installation program:

1. Double click Setup.exe to start the Oracle VirtIO Drivers for Microsoft Windows installer.

The installation program starts and prompts you to modify the current installation.

47

Known Limitations and Workarounds

Figure 5.2 Remove Installation

2. Select Remove and then click Next.

3. Select Yes from the pop-up dialog.

The installation program removes the Oracle VirtIO Drivers for Microsoft Windows and deletes thebinaries from your system.

4. When prompted, select Yes, restart the system and then click Finish to complete the uninstallation.

5.8 Known Limitations and Workarounds

The following are known limitations and workarounds.

5.8.1 Security Alert for Unsigned Drivers

The Oracle VirtIO Drivers for Microsoft Windows have not been signed by Microsoft for 32-bit MicrosoftWindows operating systems or Microsoft Windows Server 2003.

Security Alert on 32-bit Microsoft Windows Operating Systems

On 32-bit Microsoft Windows operating systems, the installer displays security alerts such as the followingfor each driver:

48

Security Alert for Unsigned Drivers

Figure 5.3 Windows Security Alert

To continue with the installation, select Install.

Security Alert on Microsoft Windows Server 2003 and Microsoft Windows Server 2008 SP2

On Microsoft Windows Server 2003 and Microsoft Windows Server 2008 SP2 (32- and 64-bit), the installerdisplays a security alert similar to the following:

The driver software you are installing has not been properly signed with Authenticode Technology. Therefore, Windows cannot tell if the software has been modified since it was published. The publisher's identity cannot be verified because of a problem: Authenticode signature not found.

Do you still want to install this software?

The following image is an example of the security alert on Microsoft Windows.

Figure 5.4 Security Alert for Driver Installation

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Found New Hardware Wizard Displayed

To continue the installation, click Yes. Then, click Continue Anyway when the installer displays amessage similar to the following:

The software you are installing has not passed Windows Logo testing to verifyits compatibility with this version of Windows.

Continuing your installation of this software may impair or destabilize the correctoperation of your system either immediately or in the future. Microsoft stronglyrecommends that you stop this installation now and contact the software vendorfor software that has passed Windows Logo testing.

The following image is an example of the preceding security alert.

Figure 5.5 Continue Software Installation

5.8.2 Found New Hardware Wizard Displayed

During the installation or uninstallation of the Oracle VirtIO Drivers for Microsoft Windows, the Found NewHardware wizard is displayed during the installation/uninstallation, and when the guest restarts. This onlyoccurs on a guest with Microsoft Windows Server 2003 (32- or 64-bit) installed.

Workaround: Click Cancel to ignore the message and close the dialog box.

5.8.3 Microsoft Windows Server 2012 Data Center Guests With FailoverClustering Cannot Get IP Address

A Microsoft Windows Server 2012 data center guest may fail to get an IP address from a DHCP server orencounter a UDP connection failure after installing the Windows Server Failover Clustering feature andrestarting the guest.

Note

This issue does not apply to Microsoft Windows Server 2012 R2. The issue affectsonly Microsoft Windows Server 2012.

Workaround:

• Install the following hotfix to correct this issue: https://support.microsoft.com/en-us/help/3062586.

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Microsoft Windows Server 2012 Data Center Guests With Failover Clustering Cannot Get IP Address

• If you experience further Windows Server Failover Clustering failures with Microsoft Windows Server2012, see Recommended hotfixes and updates for Windows Server 2012-based clusters on MicrosoftSupport at: https://support.microsoft.com/en-us/help/2784261.

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