Re: how can i tell if a running kernel has KVM functionality?

[Matthias Kaehlcke <matthias@xxxxxxxxxxxx>]

hi robert,

El Sat, Apr 04, 2009 at 08:02:29AM -0400 Robert P. J. Day ha dit:

>   is there an easy way to tell if a running kernel has KVM
> functionality?  from "make menuconfig", we can see the KVM tristate
> selections under "Virtualization:"
> 
>   --- Virtualization
>   <M>   Kernel-based Virtual Machine (KVM) support
>   < >     KVM for Intel processors support (NEW)
>   < >     KVM for AMD processors support (NEW)
> 
> so if i have no access to the corresponding config file, how can i
> tell if a kernel has any or all of the above?
> 
>   first, i know that if you choose to build all of the above as
> modules, you'll get kvm.ko, kvm-intel.ko and kvm-amd.ko, so i can
> check the modules.  but if any of that has been built into the kernel,
> is there a way to tell?  something under /proc, perhaps?

kvm_init() registers the device class 'kvm':
http://lxr.linux.no/linux+v2.6.29/virt/kvm/kvm_main.c#L2289

i guess it is called at system initialization when kvm support has
been built into the kernel. if that is the case you could check for
the existence of /sys/class/kvm

-- 
Matthias Kaehlcke
Embedded Linux Engineer
Barcelona

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