[CentOS] Xen cpu requirements

Wed Jul 14 17:55:18 UTC 2010
Brian Mathis <brian.mathis at gmail.com>

On Wed, Jul 14, 2010 at 1:49 PM, Dominik Zyla <gavroche at gavroche.pl> wrote:
> On Wed, Jul 14, 2010 at 12:32:12PM -0500, David Dyer-Bennet wrote:
>> I'm installing Centos 5.5 on a new Dell R301 server.  I wanted to run Xen
>> and have the full virtualization possibilities (this is our development
>> support server, so it runs a few real services and is available for
>> playing with things; putting the "playing with things" functions into
>> virtual servers would protect the "few real services", and make it easier
>> to clean up afterwards).
>> I have enabled virtualization support in the BIOS.
>> /proc/cpuinfo says I have
>> model name      : Intel(R) Xeon(R) CPU           X3450  @ 2.67GHz
>> and
>> flags           : fpu tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx
>> fxsr sse sse2 ss ht syscall nx lm constant_tsc ida pni est ssse3 cx16
>> sse4_1 sse4_2 popcnt lahf_lm
>> The "vmx" flag doesn't appear to be set.
>> (I'm working from
>> <http://www.centos.org/docs/5/html/Virtualization-en-US/ch-op-sys-support.html>,
>> by the way; I note that document is from 2007 or maybe even 2006, so
>> perhaps some things aren't fully up-to-date.)
>> So, does that mean my Xeon-based server doesn't have hardware
>> virtualization assistance?
> It loks like X3450 has no VMX instructions.
> --
> Dominik Zyla

You might need to go into the BIOS and enable VT extensions.  Many
systems ship with them disabled.