Re: [Xen-users] VT option is on but 'VMX enabled' is not displayed in xm dmesg

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Apr 13, 2010 at 12:54:00AM +0900, dongkyu lee wrote:
>    Thank you for your interesting.
> 
>    Are the servers identical?
>    Yes, the servers are identical. (HP DL360G6)
> 
>    Do they have different CPU models?/Do they have the same BIOS/firmware
>    versions?
>    cat /proc/cpuinfo
> 
>    All devices/BIOS/firware versions included CPU must be same because they
>    are all same model.
>

Same model doesn't guarantee same CPUs :) some CPUs might have different 
stepping etc,
especially if the servers are bought at different times. Sometime even the 
servers
from the same order are made in different countries etc.

>    I checked all of them to confirm. They are identical.
> 

Ok. Good.

>    What version of Xen are you using? What version of dom0 kernel?
>    dom0 kernel : 2.6.18-164.6.1.el5xen (on CentOS 5.3)
>    Xen version : 3.4.1
>    In case xen_caps in 'xm info' shows hvm-3.0-xxx options, I think it
>    demonstrates that
>    it is VT enabled processor and VT is also enabled.

Yes, correct.

>    I am wondering if it is possible that xm info shows hvm options but xm
>    dmesg does not display VMX info or
>    something wrong with xen or VT configuration.
> 

Did you verify "xm dmesg" shows all the boot messages starting from the 
beginning, 
from boot ime? Sometimes if you get a lot of stuff to the log you don't see the 
boot time 
messages anymore..

-- Pasi

>    Thank you so much in advance
> 
>    2010/4/12 Pasi Kärkkäinen <[1]pasik@xxxxxx>
> 
>      On Mon, Apr 12, 2010 at 07:21:24PM +0900, dongkyu lee wrote:
>      >    We have 35 xen-installed servers and enabled VT to use HVM. Five of
>      these
>      >    servers do not show
>      >    any messages about vmx when 'xm dmesg | grep vmx' is entered but
>      other
>      >    thirty servers shows message correctly like below:
>      >
>      >    (XEN) VMX: Supported advanced features:
>      >    (XEN) VMX: EPT is available.
>      >    (XEN) VMX: VPID is available.
>      >    (XEN) HVM: VMX enabled
>      >
> 
>      Are the servers identical?
> 
>      Do they have different CPU models?
>      cat /proc/cpuinfo
> 
>      Do they have the same BIOS/firmware versions?
>      >    Even if five servers do not display 'vmx enabled' messages, 'xm
>      info'
>      >    command shows that
>      >    xen_caps : 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>
>      >    I have tried to create HVM serveral times on these servers and they
>      worked
>      >    perfectly.
>      >
>      >    Finally, everything is fine but no 'VMX enabled' message even if VT
>      is
>      >    enabled.
>      >    Any comments/hints would be greatly appreciated. Thank you.
> 
>      What version of Xen are you using? What version of dom0 kernel?
>      -- Pasi
> 
> References
> 
>    Visible links
>    1. mailto:pasik@xxxxxx

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