Re: [Xen-users] How to enable VMX?

[Michael Walker <Michael.Walker@xxxxxxxxxxx>]

In order to enable VMX for use by Xen you must not only have
a VMX capable chip, you must also have a BIOS that supports
it.

If your BIOS supports it - you should have a option in the BIOS
screen which will let you 'enable' or 'disable' the feature.
Make sure it's enabled.

Also (this is the one that got me) make for my machine saving and
rebooting wasn't enough.  Once the change had been made I had
to completely power the machine down and then power it on again
before the setting would take effect.

Once it does take effect - you should no longer see the
'VMX disabled' message, but instead see a 'VMXON ...' message.


_Mike_


Guillaume Thouvenin wrote:
> Hello,
>
>  I'm trying to use the VT technology on box but when I start Xen VMX is
> disabled by Feature Control MSR as shown in the following message:
>
>
>  Xen version 3.0.2-3 (guill@xxxxxxxxxxxx) (gcc version 3.3.5 (Debian 1:3.3.5-13)) Wed May 31 16:07:00 CEST 2006 
>  Latest ChangeSet: Tue May 30 18:14:05 2006 +0100 9697:18e8e613deb9
> ...
> (XEN) Initializing CPU#0
> (XEN) Detected 3391.682 MHz processor.
> (XEN) CPU: Trace cache: 12K uops, L1 D cache: 16K
> (XEN) CPU: L2 cache: 2048K
> (XEN) CPU: Physical Processor ID: 0
> (XEN) CPU: Processor Core ID: 0
> (XEN) VMX disabled by Feature Control MSR.
> (XEN) Intel machine check architecture supported.
> (XEN) Intel machine check reporting enabled on CPU#0.
> (XEN) CPU0: Intel P4/Xeon Extended MCE MSRs (24) available
> (XEN) CPU0: Thermal monitoring handled by SMI
> (XEN) CPU0: Intel(R) Pentium(R) D CPU 3.40GHz stepping 02
> (XEN) Booting processor 1/1 eip 90000
> (XEN) Initializing CPU#1
> (XEN) CPU: Trace cache: 12K uops, L1 D cache: 16K
> (XEN) CPU: L2 cache: 2048K
> (XEN) CPU: Physical Processor ID: 0
> (XEN) CPU: Processor Core ID: 1
> (XEN) VMX disabled by Feature Control MSR.
> (XEN) Intel machine check architecture supported.
> (XEN) Intel machine check reporting enabled on CPU#1.
> (XEN) CPU1: Intel P4/Xeon Extended MCE MSRs (24) available
> (XEN) CPU1: Thermal monitoring enabled
> (XEN) CPU1: Intel(R) Pentium(R) D CPU 3.40GHz stepping 02
> (XEN) Total of 2 processors activated.
> (XEN) Testing NMI watchdog --- CPU#0 okay. CPU#1 okay.
> ...
>
>  The cpu is a pentium D dual-core and I have the following information
> about it:
>
> $ cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 6
> model name      :               Intel(R) Pentium(R) D CPU 3.40GHz
> stepping        : 2
> cpu MHz         : 3391.682
> cache size      : 2048 KB
> physical id     : 0
> siblings        : 1
> core id         : 0
> cpu cores       : 1
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 6
> wp              : yes
> flags           : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36
> clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc
> pni monitor ds_cpl vmx cid cx16 xtpr lahf_lm 
> bogomips        : 6786.28
> clflush size    : 64
> cache_alignment : 128
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
>
> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 6
> model name      :               Intel(R) Pentium(R) D CPU 3.40GHz
> stepping        : 2
> cpu MHz         : 3391.682
> cache size      : 2048 KB
> physical id     : 1
> siblings        : 1
> core id         : 0
> cpu cores       : 1
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 6
> wp              : yes
> flags           : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36
> clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc
> pni monitor ds_cpl vmx cid cx16 xtpr lahf_lm 
> bogomips        : 6786.28
> clflush size    : 64
> cache_alignment : 128
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
>
>
>  The "vmx" is present in the flags field so the processor has the VT
> technology but it seems that it's not enabled. I looked in the BIOS
> but there is nothing to enable VT. There is only something to enable the
> hyper-threading (and I think it doesn't work because I only see 2 CPUS). 
>
>  Do you know how to enable VMX feature? Is it an option during the
> compilation of Xen? or during the boot?
>
>
>
> Thanks for your help,
> Guillaume
>
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