Is there any accurate way to check if Qemu is using KVM modules?

Is there any accurate way to check if Qemu is using KVM modules?

[You, Yongkang]

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Hi all,

I am a newbie for KVM testing. 
Now I meet a problem in testing, that it seems there isn't a simple and effective way to judge if a Qemu is using KVM modules or doing pure Qemu operations. 

Checking how many reference of kvm.ko by lsmod is a way, but would meet trouble when creating multi KVM guest at the same time. And can not locate which one is using KVM modules. 

I also checked /sys file system, but didn't get any reference. Is it possible to expose some useful information about KVM/Qemu alive status and cpu assignment/usage information in the user space. This would be a good friend to customer and tester. :)

Best Regards,
Yongkang (Kangkang) 永康


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Re: Is there any accurate way to check if Qemu is using KVM modules?

[Avi Kivity]

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You, Yongkang wrote:
> Hi all,
>
> I am a newbie for KVM testing. 
> Now I meet a problem in testing, that it seems there isn't a simple and effective way to judge if a Qemu is using KVM modules or doing pure Qemu operations. 
>
> Checking how many reference of kvm.ko by lsmod is a way, but would meet trouble when creating multi KVM guest at the same time. And can not locate which one is using KVM modules. 
>
> I also checked /sys file system, but didn't get any reference. Is it possible to expose some useful information about KVM/Qemu alive status and cpu assignment/usage information in the user space. This would be a good friend to customer and tester. :)
>   

I believe there is an 'info kqemu' command in the qemu monitor. It would
be a good idea to implement an 'info kvm' to get such information in a
systematic way.


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error compiling committee.c: too many arguments to function



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Re: Is there any accurate way to check if Qemu is using KVM modules?

[You, Yongkang]

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>> I am a newbie for KVM testing.
>> Now I meet a problem in testing, that it seems there isn't a simple and
>effective way to judge if a Qemu is using KVM modules or doing pure Qemu
>operations.
>>
>> Checking how many reference of kvm.ko by lsmod is a way, but would meet
>trouble when creating multi KVM guest at the same time. And can not locate
>which one is using KVM modules.
>>
>> I also checked /sys file system, but didn't get any reference. Is it possible to
>expose some useful information about KVM/Qemu alive status and cpu
>assignment/usage information in the user space. This would be a good friend
>to customer and tester. :)
>>
>
>I believe there is an 'info kqemu' command in the qemu monitor. It would
>be a good idea to implement an 'info kvm' to get such information in a
>systematic way.
>
Hi Avi,

I tried 'info kqemu' in Qemu monitor. But I always got the same result: "kqemu supported : not compiled". Is it correct? 

Best Regards,
Yongkang (Kangkang) 永康


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Re: Is there any accurate way to check if Qemu is using KVM modules?

[Avi Kivity]

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You, Yongkang wrote:
>>> I am a newbie for KVM testing.
>>> Now I meet a problem in testing, that it seems there isn't a simple and
>>>       
>> effective way to judge if a Qemu is using KVM modules or doing pure Qemu
>> operations.
>>     
>>> Checking how many reference of kvm.ko by lsmod is a way, but would meet
>>>       
>> trouble when creating multi KVM guest at the same time. And can not locate
>> which one is using KVM modules.
>>     
>>> I also checked /sys file system, but didn't get any reference. Is it possible to
>>>       
>> expose some useful information about KVM/Qemu alive status and cpu
>> assignment/usage information in the user space. This would be a good friend
>> to customer and tester. :)
>>     
>> I believe there is an 'info kqemu' command in the qemu monitor. It would
>> be a good idea to implement an 'info kvm' to get such information in a
>> systematic way.
>>
>>     
> Hi Avi,
>
> I tried 'info kqemu' in Qemu monitor. But I always got the same result: "kqemu supported : not compiled". Is it correct? 
>
>   

Yes. I gave kqemu as an example (kqemu is similar to kvm, but does not
use hardware acceleration). We'll need to implement 'info kvm' in a
similar way (it would report the value of the kvm_allowed variable).


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error compiling committee.c: too many arguments to function



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