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[Xen-users] Centos 5.5 Xen not showing vmx flag!!!

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  • From: Periko Support <pheriko.support@xxxxxxxxx>
  • Date: Thu, 2 Sep 2010 14:46:39 -0700
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Hi people.

Hope some could help answering this thread.

I have a new server supermicro X8DTE/X8DT6 with CPU Intel E5620 which Intel say that has support for virtualization.

The BIOS have this 2 options, just one was disable by default.

Intel Virtualization Tech Enable Yes.
North bridge Chipset -> Intel VT-d enable.

I have enable this 2 settings and follow the instructions to make this change available.

I have install Xen and reboot my server, I have been reading about Xen, normally went u have a server where u want to virtualize u want to have all the features available, well I try to see if my server have the right flags for the Intel 'vmx' but I don't see that flag:

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 44
model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz
stepping : 2
cpu MHz : 1600.000
cache size : 12288 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc ida arat pni est ssse3 cx16 sse4_1 sse4_2 popcnt lahf_lm
bogomips : 5987.47
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

This server have 24GB ram, now let me show u dmidecode:

Now, running dmidecode I have other info:
Processor Information
Socket Designation: CPU 2
Type: Central Processor
Family: Xeon
Manufacturer: Intel
ID: C2 06 02 00 FF FB EB BF
Signature: Type 0, Family 6, Model 44, Stepping 2

VME (Virtual mode extension)
PAE (Physical address extension)

I just put here the part that took my attention.

Now let me show u hypervisor capabilities:


cat /sys/hypervisor/properties/capabilities
xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
This a new field for me, does this mean that my server have the capabilities but I cannot use them?

I a little confuse because I don't see the Quote:

Thanks for your time.

P.S. Xen 3.0.3.x
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