Re: [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock

[Waiman Long]

On 02/20/2014 02:32 PM, Raghavendra K T wrote:
> On 02/20/2014 11:24 PM, Waiman Long wrote:
>
> > Now the key is how to detect if a kernel is really running in a PV
> > environment. I need to ask some virtualization experts on that.
>
> For kvm you could just follow,
> kvm_spinlock_init_jump() and KVM_FEATURE_* encoding in cpuid
> part __do_cpuid_ent().

I saw that in the arch/x86/kernel/kvm.c file. So I think I can use the 
returned value of kvm_para_available() to decide if it is running in a 
KVM guest. However, I am not so sure of what to use in xen.

-Longman
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