147 lines
8.0 KiB
XML
147 lines
8.0 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0"
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xml:id="section_kvm_enable">
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<title>Enable KVM</title>
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<para>The following sections outline how to enable KVM based
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hardware virtualisation on different architectures
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and platforms. To perform these steps, you must be logged
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in as the <systemitem>root</systemitem> user.</para>
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<section xml:id="x86_based_systems">
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<title>For x86 based systems</title>
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<procedure>
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<step>
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<para>To determine whether the <literal>svm</literal> or
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<literal>vmx</literal> CPU extensions are present,
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run this command:</para>
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<screen><prompt>#</prompt> <userinput>grep -E 'svm|vmx' /proc/cpuinfo</userinput></screen>
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<para>This command generates output if the CPU is
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capable of hardware-virtualization. Even if output is
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shown, you might still need to enable virtualization
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in the system BIOS for full support.</para>
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<para>If no output appears, consult your system
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documentation to ensure that your CPU and motherboard
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support hardware virtualization. Verify that any
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relevant hardware virtualization options are enabled
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in the system BIOS.</para>
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<para>The BIOS for each manufacturer is different. If you
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must enable virtualization in the BIOS, look for an
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option containing the words
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<literal>virtualization</literal>,
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<literal>VT</literal>, <literal>VMX</literal>, or
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<literal>SVM</literal>.</para>
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</step>
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<step>
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<para>To list the loaded kernel modules and verify that
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the <literal>kvm</literal> modules are loaded, run
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this command:</para>
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<screen><prompt>#</prompt> <userinput>lsmod | grep kvm</userinput></screen>
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<para>If the output includes
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<systemitem>kvm_intel</systemitem> or
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<systemitem>kvm_amd</systemitem>, the
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<systemitem>kvm</systemitem> hardware
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virtualization modules are loaded and your kernel
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meets the module requirements for OpenStack
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Compute.</para>
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<para>If the output does not show that the
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<literal>kvm</literal> module is loaded, run this
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command to load it:</para>
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<screen><prompt>#</prompt> <userinput>modprobe -a kvm</userinput></screen>
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<para>Run the command for your CPU. For Intel, run this
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command:</para>
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<screen><prompt>#</prompt> <userinput>modprobe -a kvm-intel</userinput></screen>
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<para>For AMD, run this command:</para>
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<screen><prompt>#</prompt> <userinput>modprobe -a kvm-amd</userinput></screen>
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<para>Because a KVM installation can change user group
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membership, you might need to log in again for changes
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to take effect.</para>
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<para>If the kernel modules do not load automatically, use
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the procedures listed in these subsections.</para>
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</step>
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</procedure>
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<para>If the checks indicate that required hardware virtualization
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support or kernel modules are disabled or unavailable, you
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must either enable this support on the system or find a system
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with this support.</para>
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<note>
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<para>Some systems require that you enable VT support in the
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system BIOS. If you believe your processor supports
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hardware acceleration but the previous command did not
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produce output, reboot your machine, enter the system
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BIOS, and enable the VT option.</para>
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</note>
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<para>If KVM acceleration is not supported, configure Compute to
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use a different hypervisor, such as <link
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xlink:href="http://docs.openstack.org/trunk/config-reference/content/qemu.html"
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>QEMU</link> or <link
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xlink:href="http://docs.openstack.org/trunk/config-reference/content/xen_libvirt.html"
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>Xen</link>.</para>
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<para>These procedures help you load the kernel modules for
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Intel-based and AMD-based processors if they do not load
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automatically during KVM installation.</para>
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<section xml:id="kvm-intel">
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<title>Intel-based processors</title>
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<para>If your compute host is Intel-based, run these commands
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as root to load the kernel modules:</para>
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<screen><prompt>#</prompt> <userinput>modprobe kvm</userinput>
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<prompt>#</prompt> <userinput>modprobe kvm-intel</userinput></screen>
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<para>Add these lines to the <filename>/etc/modules</filename>
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file so that these modules load on reboot:</para>
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<programlisting>kvm
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kvm-intel</programlisting>
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</section>
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<section xml:id="kvm-amd">
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<title>AMD-based processors</title>
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<para>If your compute host is AMD-based, run these commands as
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root to load the kernel modules:</para>
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<screen><prompt>#</prompt> <userinput>modprobe kvm</userinput>
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<prompt>#</prompt> <userinput>modprobe kvm-amd</userinput></screen>
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<para>Add these lines to <filename>/etc/modules</filename>
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file so that these modules load on reboot:</para>
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<programlisting>kvm
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kvm-amd</programlisting>
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</section>
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</section>
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<section xml:id="kvm-on-POWER">
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<title>For POWER based systems</title>
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<para>KVM as a hypervisor is supported on POWER system's PowerNV
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platform.</para>
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<procedure>
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<step>
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<para>To determine if your POWER platform
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supports KVM based virtualization run the
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following command:</para>
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<screen><prompt>#</prompt><userinput>cat /proc/cpuinfo | grep PowerNV</userinput></screen>
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<para>If the previous command generates the following output,
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then CPU supports KVM based virtualization</para>
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<screen><computeroutput>platform: PowerNV</computeroutput></screen>
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<para>If no output is displayed, then your POWER platform does not
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support KVM based hardware virtualization.</para>
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</step>
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<step>
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<para>To list the loaded kernel modules and verify that
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the <literal>kvm</literal> modules are loaded, run
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the following command:</para>
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<screen><prompt>#</prompt> <userinput>lsmod | grep kvm</userinput></screen>
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<para>If the output includes
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<systemitem>kvm_hv</systemitem>, the
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<systemitem>kvm</systemitem> hardware
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virtualization modules are loaded and your kernel
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meets the module requirements for OpenStack Compute.</para>
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<para>If the output does not show that the
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<literal>kvm</literal> module is loaded, run the
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following command to load it:</para>
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<screen><prompt>#</prompt> <userinput>modprobe -a kvm</userinput></screen>
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<para>For PowerNV platform, run the following command:</para>
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<screen><prompt>#</prompt> <userinput>modprobe -a kvm-hv</userinput></screen>
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<para>Because a KVM installation can change user group
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membership, you might need to log in again for changes
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to take effect.</para>
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</step>
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</procedure>
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</section>
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</section>
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