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1. Installing KVM with a new Red Hat Enterprise Linux installation

1. Start an interactive Red Hat Enterprise Linux installation from the Red Hat Enterprise Linux Installation CD-ROM, DVD or PXE.

2. You must enter a valid installation number when prompted to receive access to the virtualization and otherAdvanced Platform packages.

3. Complete the other steps up to the package selection step.

Select the Virtualization package group and the Customize Now radio button.

4. Select the KVM package group. Deselect the Virtualization package group. This selects the KVM hypervisor

virt-manager, libvirt and virt-viewer for installation.

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5. Customize the packages (if required)

Customize the Virtualization group if you require other virtualization packages.

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Press Close followed by Next to continue the installation.

Installing KVM packages on an existing Red Hat Enterprise Linux system

Installing the KVM hypervisor with yum

To use virtualization on Red Hat Enterprise Linux you require the kvm package. The kvm package contains the KVMkernel module providing the KVM hypervisor on the default Red Hat Enterprise Linux kernel.To install the kvm package, run:# yum install kvmNow, install additional virtualization management packages.

Recommended virtualization packages:

python-virtinstProvides the virt-install command for creating virtual machines.

libvirt

libvirt is an API library for interacting with hypervisors. libvirt uses the xm virtualization framework and thevirsh command line tool to manage and control virtual machines.

libvirt-pythonThe libvirt-python package contains a module that permits applications written in the Python programminglanguage to use the interface supplied by the libvirt API.

virt-managervirt-manager, also known as Virtual Machine Manager, provides a graphical tool for administering virtualmachines. It uses libvirt library as the management API.

Install the other recommended virtualization packages:# yum install virt-manager libvirt libvirt-python python-virtinst

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2. Install driver for Titan adapter

While installing the 2.6.18-164.el5-x86_64 (5.4 GA), make sure to select development to get the sources, lib,compiler etc. You also need to build a soft link to point to /usr/src/kernels/2.6.18-164.el5-x86_64 (5.4 GA) as thesources to this newer 2.6.18-165.el5.cdub_sriov2 rpm is not available in order to successfully compile the driver.

#insmod vxge.ko max_config_dev=4

3. Installing Red Hat Enterprise Linux as a fully virtualized guest

Open virt-manager

Start virt-manager. Launch the Virtual Machine Managerapplication from the Applications menu and SystemTools submenu. Alternatively, run the virt-manager command as root.

Select the hypervisor

Select the hypervisor. If installed, select Xen or KVM. For this example, select KVM. Note that presently KVM isnamed qemu.

Connect to a hypervisor if you have not already done so. Open the File menu and select the Add Connection...option. Refer to Section 23.1, The open connection window.Once a hypervisor connection is selected the New button becomes available. Press the New button.

Start the new virtual machine wizard

Pressing the New button starts the virtual machine creation wizard.

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Press Forward to continue.

Name the virtual machine

Provide a name for your virtualized guest. Punctuation and whitespace characters are not permitted.

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Press Forward to continue.

Choose a virtualization method

Choose the virtualization method for the virtualized guest. Note you can only select an installed virtualization method.If you selected KVM or Xen earlier (Step 4) you must use the hypervisor you selected. This example uses the KVMhypervisor.

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Press Forward to continue.

Select the installation method

For all versions of Windows you must use local install media, either an ISO image or physical optical media.PXE may be used if you have a PXE server configured for Windows network installation. PXE Windows installation isnot covered by this guide.Set OS Type to Windows and OS Variant to Microsoft Windows 2008 as shown in the screenshot.

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Press Forward to continue.

Locate installation media

Select ISO image location or CD-ROM or DVD device. This example uses an ISO file image of the Red Hat EnterpriseLinux installation DVD.

1. Press the Browse button.

2. Search to the location of the ISO file and select the ISO image. Press Open to confirm your selection.

3. The file is selected and ready to install from.

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Press Forward to continue.

Image files and SELinux

For ISO image files and guest storage images the the recommended to use the /var/lib/libvirt/images/ directory. Anyother location may require additional configuration for SELinux, refer toSection 11.1, SELinux and virtualizationfordetails.

Storage setup

Assign a physical storage device (Block device) or a file-based image (File). File-based images must be stored in the

/var/lib/libvirt/images/ directory. Assign sufficient storage for your virtualized guest. Assign sufficient space for yourvirtualized guest and any application it requires.

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Press Forward to continue.

To migrating this guest

Live and offline migrations require guests to be installed on shared network storage. For information on setting upshared storage for guests refer toChapter 9, Shared storage and virtualization.

Network setup

Select eitherVirtual network orShared physical device.The virtual network option uses Network Address Translation (NAT) to share the default network device with thevirtualized guest. Use the virtual network option for wireless networks.The shared physical device option uses a network bond to give the virtualized guest full access to a network device.

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Press Forward to continue.

Memory and CPU allocation

The Allocate memory and CPU window displays. Choose appropriate values for the virtualized CPUs and RAMallocation. These values affect the host's and guest's performance.

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Press Forward to continue.

Verify and start guest installation

Verify the configuration.

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Press Finish to start the guest installation procedure.

Installing Red Hat Enterprise Linux

Complete the Red Hat Enterprise Linux 5 installation sequence.

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Assigning passthru device to a Guest OS

VT-d support is disabled by default. To enable VT-d one must add intel_iommu=on to thekernel command line. Enabling VT-d is required to assign a host's PCI device to a KVM guest.You can add this to grub.conf.

Launch VMM

# virt-manager

In the virtual manager, select the VM to add the passthru device, right click and select open.Select the Hardware tab.

Click Add Hardware

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When you power on the VM, you can see something below in the dmesg

PCI: Enabling device 0000:02:00.3 (0000 -> 0002)

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Adding a virtual network (Bridge) in the Host for Guest OS

Launch VMM# virt-managerSelect localhost. Right click and select Details. Select Virtual Networks tab. Click on + button..The following screens will guide through the steps.

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Cloning a VM

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Sample Guest Configuration file

# cat /etc/libvirt/qemu/rhel54-vm1.xmlrhel54-vm1c52d8ece-2c1c-f8f5-4727-b951013ea8eb524288524288

1hvm

destroyrestartrestart

/usr/libexec/qemu-kvm