HVM Loader Doesn't See the "vcpus" Parameter?

[Ahamed K, Rafiq (HP)]

Every time "hvmloader" comes up to load a VM, it shows  cpu=1 as
detected, no matter what number you give in .hvm configuration file. I
have vcpus=2 and cpus = "2-4" in my .hvm file!
 
Any idea why is this?  Or Am I missing anything?
 
I am guessing due to this I am not able to run the un-modified
"Multiprocessor" Windows.
 
Any help would be appreciated.
 
Thanks R
 
 
These are the details of my configuration
 
I am having a server with 2 dual core XEON with VT-x enabled on it.
 
Linux linux 2.6.16.13-xen #2 SMP Wed May 24 10:41:28 MDT 2006 i686 i686
i386 GNU/Linux
 
linux:~ # xm info
host                   : linux
release                : 2.6.16.13-xen
version                : #2 SMP Wed May 24 10:41:28 MDT 2006
machine                : i686
nr_cpus                : 8
nr_nodes               : 1
sockets_per_node       : 2
cores_per_socket       : 2
threads_per_core       : 2
cpu_mhz                : 2667
hw_caps                :
bfebfbff:20100000:00000000:00000180:000064bd:00000000:00000001
total_memory           : 3583
free_memory            : 2522
xen_major              : 3
xen_minor              : 0
xen_extra              : -unstable
xen_caps               : xen-3.0-x86_32 hvm-3.0-x86_32
platform_params        : virt_start=0xfc000000
xen_changeset          : Sun May 21 20:15:58 2006 +0100
10058:14717dedba02
cc_compiler            : gcc version 4.0.2 20050901 (prerelease) (SUSE
Linux)
cc_compile_by          : root
cc_compile_domain      : local
cc_compile_date        : Wed May 24 10:31:04 MDT 2006

[Richard Camp]

Hello,

If memory serves me correctly Intel's VT-X technology supports only one 
virtual cpu.  Even if you have 4 cores the guest OS will only see one of 
them.  Multiprocessor Windows would be pointless.

A modified xen guest would see multiple cpus. 

Richard

Ahamed K, Rafiq (HP) wrote:
>  Every time "hvmloader" comes up to load a VM, it shows 
> cpu=1 as 
>  detected, no matter what number you give in .hvm configuration file. I 
>  have vcpus=2 and cpus = "2-4" in my .hvm file!
>   
>  Any idea why is this?  Or Am I missing anything?
>   
>  I am guessing due to this I am not able to run the un-modified 
>  "Multiprocessor" Windows.
>   
>  Any help would be appreciated.
>   
>  Thanks R
>   
>   
>  These are the details of my configuration
>   
>  I am having a server with 2 dual core XEON with VT-x enabled on it.
>   
>  Linux linux 2.6.16.13-xen #2 SMP Wed May 24 10:41:28 MDT 2006 i686 
>  i686 i386 GNU/Linux
>   
>  linux:~ # xm info
>  host                   : linux
>  release                : 2.6.16.13-xen
>  version                : #2 SMP Wed May 24 10:41:28 MDT 2006
>  machine                : i686
>  nr_cpus                : 8
>  nr_nodes               : 1
>  sockets_per_node       : 2
>  cores_per_socket       : 2
>  threads_per_core       : 2
>  cpu_mhz                : 2667
>  hw_caps                : 
>  bfebfbff:20100000:00000000:00000180:000064bd:00000000:00000001
>  total_memory           : 3583
>  free_memory            : 2522
>  xen_major              : 3
>  xen_minor              : 0
>  xen_extra              : -unstable
>  xen_caps               : xen-3.0-x86_32 hvm-3.0-x86_32
>  platform_params        : virt_start=0xfc000000
>  xen_changeset          : Sun May 21 20:15:58 2006 +0100 10058:14717dedba02
>  cc_compiler            : gcc version 4.0.2 20050901 (prerelease) (SUSE 
>  Linux)
>  cc_compile_by          : root
>  cc_compile_domain      : local
>  cc_compile_date        : Wed May 24 10:31:04 MDT 2006
>   
>  ------------------------------------------------------------------------
>
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>  Fedora-xen(a)redhat.com
>  https://www.redhat.com/mailman/listinfo/fedora-xen
>

[Ahamed K, Rafiq (HP)]

I haven't read that anywhere. If you find a pointer, can you please
forward me?
And moreover in the latest XEN 3.0.2 they have the support for SMP
Guests. And my belief was that was for  vmx guests too?

Thanks R


-----Original Message-----
From: Richard Camp [mailto:[e-mail]] 
Sent: Wednesday, May 31, 2006 9:01 PM
To: Ahamed K, Rafiq (HP)
Cc: fedora-xen(a)redhat.com
Subject: Re: [Fedora-xen] HVM Loader Doesn't See the "vcpus" Parameter?

Hello,

If memory serves me correctly Intel's VT-X technology supports only one 
virtual cpu.  Even if you have 4 cores the guest OS will only see one of

them.  Multiprocessor Windows would be pointless.

A modified xen guest would see multiple cpus. 

Richard

Ahamed K, Rafiq (HP) wrote:
>  Every time "hvmloader" comes up to load a VM, it shows 
> cpu=1 as 
>  detected, no matter what number you give in .hvm configuration file. I 
>  have vcpus=2 and cpus = "2-4" in my .hvm file!
>   
>  Any idea why is this?  Or Am I missing anything?
>   
>  I am guessing due to this I am not able to run the un-modified 
>  "Multiprocessor" Windows.
>   
>  Any help would be appreciated.
>   
>  Thanks R
>   
>   
>  These are the details of my configuration
>   
>  I am having a server with 2 dual core XEON with VT-x enabled on it.
>   
>  Linux linux 2.6.16.13-xen #2 SMP Wed May 24 10:41:28 MDT 2006 i686 
>  i686 i386 GNU/Linux
>   
>  linux:~ # xm info
>  host                   : linux
>  release                : 2.6.16.13-xen
>  version                : #2 SMP Wed May 24 10:41:28 MDT 2006
>  machine                : i686
>  nr_cpus                : 8
>  nr_nodes               : 1
>  sockets_per_node       : 2
>  cores_per_socket       : 2
>  threads_per_core       : 2
>  cpu_mhz                : 2667
>  hw_caps                : 
>  bfebfbff:20100000:00000000:00000180:000064bd:00000000:00000001
>  total_memory           : 3583
>  free_memory            : 2522
>  xen_major              : 3
>  xen_minor              : 0
>  xen_extra              : -unstable
>  xen_caps               : xen-3.0-x86_32 hvm-3.0-x86_32
>  platform_params        : virt_start=0xfc000000
>  xen_changeset          : Sun May 21 20:15:58 2006 +0100 
10058:14717dedba02
>  cc_compiler            : gcc version 4.0.2 20050901 (prerelease)
> (SUSE 
>  Linux)
>  cc_compile_by          : root
>  cc_compile_domain      : local
>  cc_compile_date        : Wed May 24 10:31:04 MDT 2006
>   
>  
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>  Fedora-xen(a)redhat.com
>  https://www.redhat.com/mailman/listinfo/fedora-xen
>