linux-kernel - Re: [PATCH RFC v6 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM

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Date:	Thu, 13 Mar 2014 14:59:26 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Waiman Long <Waiman.Long@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
	Peter Zijlstra <peterz@...radead.org>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	Andi Kleen <andi@...stfloor.org>,
	Michel Lespinasse <walken@...gle.com>,
	Alok Kataria <akataria@...are.com>, linux-arch@...r.kernel.org,
	Gleb Natapov <gleb@...hat.com>, x86@...nel.org,
	xen-devel@...ts.xenproject.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Scott J Norton <scott.norton@...com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Chegu Vinod <chegu_vinod@...com>, linux-kernel@...r.kernel.org,
	David Vrabel <david.vrabel@...rix.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH RFC v6 10/11] pvqspinlock, x86: Enable qspinlock PV support
 for KVM

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

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