From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v7 06/11] pvqspinlock, x86: Allow unfair queue spinlock
	in a KVM guest
Date: Thu, 20 Mar 2014 15:29:28 -0700
Message-ID: <532B6BC8.8010502@zytor.com>
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Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
	Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
	Gleb Natapov <gleb@redhat.com>, Aswin Chandramouleeswaran <aswin@hp.com>,
	Andi Kleen <andi@firstfloor.org>, Michel Lespinasse <walken@google.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	linux-arch@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org,
	xen-devel@lists.xenproject.org,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Scott J Norton <scott.norton@hp.com>, Steven Rostedt <rostedt@goodmis.org>,
	Chris Wright <chrisw@sous-sol.org>, Alok Kataria <akataria@vmware.com>,
	virtualization@lists.linux-foundation.org,
	Chegu Vinod <chegu_vinod@hp.com>,
	Oleg Nesterov <oleg@redhat.com>, linux-kernel@vger.kernel.org,
	David Vrabel <david.vrabel@citrix.com>,
	Andrew Morton <akpm@linux-foundation.org>
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>
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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