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

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Message-ID: <4EDF6049.2030204@redhat.com>
Date:	Wed, 07 Dec 2011 14:47:05 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Raghavendra K T <raghukt@...ux.vnet.ibm.com>,
	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>,
	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>
Subject: Re: [PATCH RFC V3 2/4] kvm hypervisor : Add a hypercall to KVM hypervisor
 to support pv-ticketlocks

On 12/07/2011 02:33 PM, Marcelo Tosatti wrote:
> > 
> > Also Avi pointed that, logically kvm_arch_vcpu_ioctl_set_mpstate should
> > be called only in vcpu thread, so after further debugging, I noticed
> > that,  setting vcpuN->mp_state = KVM_MP_STATE_RUNNABLE; is not
> > necessary.
> > I 'll remove that in the next patch. Thanks for pointing.
>
> In fact you don't need kvm_arch_vcpu_ioctl_set_mpstate either, only the
> new "kicked" flag.

If we have a kicked flag, it becomes necessary to live migrate it.

Maybe we can change KVM_GET_MP_STATE to fold the kicked flag into the mp
state (converting HALTED into RUNNABLE).

Also I think we can keep the kicked flag in vcpu->requests, no need for
new storage.

-- 
error compiling committee.c: too many arguments to function

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