Xen users - Apr 2010 - VT option is on but ''VMX enabled'' is not displayed in xm dmesg

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

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.


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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


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

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.
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.

Thank you so much in advance

2010/4/12 Pasi Kärkkäinen <pasik@iki.fi>
> 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
>
>

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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@iki.fi>
> 
>      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@iki.fi
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