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Date: Thu, 20 Mar 2014 15:29:28 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Paolo Bonzini <pbonzini@redhat.com>, Waiman Long <Waiman.Long@hp.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>, Peter Zijlstra <peterz@infradead.org>
CC: Jeremy Fitzhardinge <jeremy@goop.org>,
        Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
        kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
        Andi Kleen <andi@firstfloor.org>,
        Michel Lespinasse <walken@google.com>,
        Alok Kataria <akataria@vmware.com>, linux-arch@vger.kernel.org,
        Gleb Natapov <gleb@redhat.com>, x86@kernel.org,
        xen-devel@lists.xenproject.org,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Scott J Norton <scott.norton@hp.com>,
        Rusty Russell <rusty@rustcorp.com.au>,
        Steven Rostedt <rostedt@goodmis.org>,
        Chris Wright <chrisw@sous-sol.org>, Oleg Nesterov <oleg@redhat.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Aswin Chandramouleeswaran <aswin@hp.com>,
        Chegu Vinod <chegu_vinod@hp.com>, linux-kernel@vger.kernel.org,
        David Vrabel <david.vrabel@citrix.com>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v7 06/11] pvqspinlock, x86: Allow unfair queue spinlock
 in a KVM guest
References: <1395260049-30839-1-git-send-email-Waiman.Long@hp.com> <1395260049-30839-7-git-send-email-Waiman.Long@hp.com> <532B6543.7050707@redhat.com>
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On 03/20/2014 03:01 PM, Paolo Bonzini wrote:
> 
> 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.

	-hpa