xen-detect.c question.

xen-detect.c question.

[정희동]

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Hello, I have a question about xen-detect.c (which is posted
http://lists.xensource.com/archives/html/xen-changelog/2007-02/msg00075.html
 here)

It says that by running this program xen PV and HVM can be detected.

First of all, is it true that it can detect HVM (hardware support Xen)?
Can anyone confirm this?

If it is true then can anyone explain me how this can detect xen?

Thank you in advance.

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Re: xen-detect.c question.

[Akio Takebe]

Hi,

정희동 wrote:
> Hello, I have a question about xen-detect.c (which is posted
> http://lists.xensource.com/archives/html/xen-changelog/2007-02/msg00075.html
>  here)
> 
> It says that by running this program xen PV and HVM can be detected.
> 
> First of all, is it true that it can detect HVM (hardware support Xen)?
> Can anyone confirm this?
> 
Yes, you should also confirm it.

> If it is true then can anyone explain me how this can detect xen?
> 
See the following thread.
http://thread.gmane.org/gmane.comp.emulators.kvm.devel/22643

Best Regards,

Akio Takebe

Re: xen-detect.c question.

[정희동]

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Hello,

Thank you so much for the reply =)

I will confirm it myself soon.

2009/5/26 Akio Takebe <takebe_akio@jp.fujitsu.com>

> Hi,
>
> 정희동 wrote:
>
>> Hello, I have a question about xen-detect.c (which is posted
>>
>> http://lists.xensource.com/archives/html/xen-changelog/2007-02/msg00075.html
>>  here)
>>
>> It says that by running this program xen PV and HVM can be detected.
>>
>> First of all, is it true that it can detect HVM (hardware support Xen)?
>> Can anyone confirm this?
>>
>>  Yes, you should also confirm it.
>
>  If it is true then can anyone explain me how this can detect xen?
>>
>>  See the following thread.
> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/22643
>
> Best Regards,
>
> Akio Takebe
>

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Re: xen-detect.c question.

[Dulloor]

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Wrt xen implementation, you can take a look at the function
cpuid_hypervisor_leaves.
The min leaf for xen (MSR base address) is 0x40000000.

Btw, I don't follow the special handling of viridian domains in
cpuid_hypervisor_leaves, when its taken care of in cpuid_viridian_leaves
(both called from hvm_cpuid). Is it dead code ?

-dulloor

***CL final (Barca vs Man-U) - 2:30 PM (EST)***


2009/5/26 정희동 <heedongj@gmail.com>

> Hello,
>
> Thank you so much for the reply =)
>
> I will confirm it myself soon.
>
> 2009/5/26 Akio Takebe <takebe_akio@jp.fujitsu.com>
>
>> Hi,
>>
>> 정희동 wrote:
>>
>>> Hello, I have a question about xen-detect.c (which is posted
>>>
>>> http://lists.xensource.com/archives/html/xen-changelog/2007-02/msg00075.html
>>>  here)
>>>
>>> It says that by running this program xen PV and HVM can be detected.
>>>
>>> First of all, is it true that it can detect HVM (hardware support Xen)?
>>> Can anyone confirm this?
>>>
>>>  Yes, you should also confirm it.
>>
>>  If it is true then can anyone explain me how this can detect xen?
>>>
>>>  See the following thread.
>> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/22643
>>
>> Best Regards,
>>
>> Akio Takebe
>>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
>

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Re: xen-detect.c question.

[Tim Deegan]

At 23:45 +0100 on 26 May (1243381500), Dulloor wrote:
> Wrt xen implementation, you can take a look at the function cpuid_hypervisor_leaves.
> The min leaf for xen (MSR base address) is 0x40000000.
> 
> Btw, I don't follow the special handling of viridian domains in cpuid_hypervisor_leaves, when its taken care of in cpuid_viridian_leaves (both called from hvm_cpuid). Is it dead code ?
> 

Viridian's CPUID leaves live at the same place as Xen's do (the idea
being, that's where you look to find out which hypervisor is running).
When we expose both interfaces, we need to move the Xen ones to a
different set of leaves.  When PV-on-HVM drivers find a hypervisor at
0x40000000 that isn't the one they were expecting, they should keep
looking at 0x100 increments until they find either the one they want or
zero.

Cheers,

Tim.

> -dulloor
> 
> ***CL final (Barca vs Man-U) - 2:30 PM (EST)***
> 
> 
> 2009/5/26 ?????? <heedongj@gmail.com<mailto:heedongj@gmail.com>>
> Hello,
> 
> Thank you so much for the reply =)
> 
> I will confirm it myself soon.
> 
> 2009/5/26 Akio Takebe <takebe_akio@jp.fujitsu.com<mailto:takebe_akio@jp.fujitsu.com>>
> 
> Hi,
> 
> 
> ?????? wrote:
> Hello, I have a question about xen-detect.c (which is posted
> http://lists.xensource.com/archives/html/xen-changelog/2007-02/msg00075.html
>  here)
> 
> It says that by running this program xen PV and HVM can be detected.
> 
> First of all, is it true that it can detect HVM (hardware support Xen)?
> Can anyone confirm this?
> 
> Yes, you should also confirm it.
> 
> 
> If it is true then can anyone explain me how this can detect xen?
> 
> See the following thread.
> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/22643
> 
> Best Regards,
> 
> Akio Takebe
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com<mailto:Xen-devel@lists.xensource.com>
> http://lists.xensource.com/xen-devel
> 
> 

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-- 
Tim Deegan <Tim.Deegan@citrix.com>
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]