linux-kernel - Re: [PATCH RFC V3 2/4] kvm hypervisor : Add a hypercall to KVM hypervisor to support pv-ticketlocks

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Date:	Fri, 02 Dec 2011 17:59:16 +0530
From:	Raghavendra K T <raghukt@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Greg Kroah-Hartman <gregkh@...e.de>, KVM <kvm@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Virtualization <virtualization@...ts.linux-foundation.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Gleb Natapov <gleb@...hat.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>,
	Xen <xen-devel@...ts.xensource.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <levinsasha928@...il.com>,
	Suzuki Poulose <suzuki@...ux.vnet.ibm.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH RFC V3 2/4] kvm hypervisor : Add a hypercall to KVM hypervisor
 to support pv-ticketlocks

On 12/02/2011 01:20 AM, Raghavendra K T wrote:
>>> + struct kvm_mp_state mp_state;
>>> +
>>> + mp_state.mp_state = KVM_MP_STATE_RUNNABLE;
>>> + if (vcpu) {
>>> + vcpu->kicked = 1;
>>> + /* Ensure kicked is always set before wakeup */
>>> + barrier();
>>> + }
>>> + kvm_arch_vcpu_ioctl_set_mpstate(vcpu,&mp_state);
>>
>> This must only be called from the vcpu thread.
>
> Hmm. Okay. 'll check this.
>

Yes true. kvm_arch_vcpu_ioctl_set_mpstate itself is redundant, and will 
remove this.

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