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SubjectRe: [PATCH v7 06/11] pvqspinlock, x86: Allow unfair queue spinlock in a KVM guest
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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