Re: [Xen-devel] [PATCH v7 06/11] pvqspinlock, x86: Allow unfair queue spinlock in a KVM guest

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

Il 20/03/2014 23:29, H. Peter Anvin ha scritto:
> > No!  Please do what I asked you to do.  You are not handling Hyper-V or
> > VMWare.  Just use X86_FEATURE_HYPERVISOR and it will cover all
> > hypervisors that actually follow Intel's guidelines.
>
> And for those that don't, we should turn on X86_FEATURE_HYPERVISOR in
> the Linux enumeration code as we do for other features we detect
> independently.
Yeah, but all the hypervisors we detect right now are fine.  Not 
surprising, since Microsoft won't certify Windows on your hypervisor 
unless you set the bit, and KVM/Xen/VMware are all certified (Hyper-V 
does not go through the same certification, but sets it anyway).
I got a second-hand report that VirtualBox doesn't set it---and I 
haven't verified that yet---but we don't even try to detect vbox right now.
Paolo

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