linux-kernel - Re: [PATCH v2 1/7] KVM Guest: Add VCPU running/pre-empted state for guest

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Message-ID: <87d34vsurx.fsf@abhimanyu.in.ibm.com>
Date:	Tue, 19 Jun 2012 11:33:30 +0530
From:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	peterz@...radead.org, mingo@...e.hu, avi@...hat.com,
	raghukt@...ux.vnet.ibm.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org, jeremy@...p.org,
	vatsa@...ux.vnet.ibm.com, hpa@...or.com
Subject: Re: [PATCH v2 1/7] KVM Guest: Add VCPU running/pre-empted state for guest

On Tue, 12 Jun 2012 19:43:10 -0300, Marcelo Tosatti <mtosatti@...hat.com> wrote:
> On Mon, Jun 04, 2012 at 10:36:05AM +0530, Nikunj A. Dadhania wrote:
> > The patch adds guest code for msr between guest and hypervisor. The
> > msr will export the vcpu running/pre-empted information to the guest
> > from host. This will enable guest to intelligently send ipi to running
> > vcpus and set flag for pre-empted vcpus. This will prevent waiting for
> > vcpus that are not running.
> > 
> > Suggested-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Signed-off-by: Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>

[...]

> > @@ -433,6 +464,8 @@ void __init kvm_guest_init(void)
> >  		pv_time_ops.steal_clock = kvm_steal_clock;
> >  	}
> >  
> > +	has_vcpu_state = 1;
> > +
> 
> Should be checking for a feature bit, see kvm_para_has_feature() 
> examples above in the function.
>
Sure, will take of this in my next version. 


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