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Date: Thu, 13 Mar 2014 14:59:26 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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To: Waiman Long <Waiman.Long@hp.com>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.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 RFC v6 10/11] pvqspinlock, x86: Enable qspinlock PV support
 for KVM
References: <1394650498-30118-1-git-send-email-Waiman.Long@hp.com> <1394650498-30118-11-git-send-email-Waiman.Long@hp.com>
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Il 12/03/2014 19:54, Waiman Long ha scritto:
> @@ -807,8 +889,13 @@ void __init kvm_spinlock_init(void)
>  	if (!kvm_para_has_feature(KVM_FEATURE_PV_UNHALT))
>  		return;
>
> +#ifdef CONFIG_QUEUE_SPINLOCK
> +	pv_lock_ops.kick_cpu = kvm_kick_cpu_type;
> +	pv_lock_ops.hibernate = kvm_hibernate;
> +#else
>  	pv_lock_ops.lock_spinning = PV_CALLEE_SAVE(kvm_lock_spinning);
>  	pv_lock_ops.unlock_kick = kvm_unlock_kick;
> +#endif

This should also disable the unfair path.

Paolo