linux-kernel - Re: [PATCH v6 02/12] Halt vcpu if page it tries to access is swapped out.

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Date:	Sun, 10 Oct 2010 18:17:59 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	kvm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, hpa@...or.com,
	riel@...hat.com, cl@...ux-foundation.org, mtosatti@...hat.com
Subject: Re: [PATCH v6 02/12] Halt vcpu if page it tries to access is
 swapped out.

On Sun, Oct 10, 2010 at 05:56:31PM +0200, Avi Kivity wrote:
>  On 10/10/2010 05:55 PM, Avi Kivity wrote:
> >>There is special completion that tells guest to wake all sleeping tasks
> >>on vcpu. It is delivered after migration on the destination.
> >>
> >>
> >
> >Yes, I saw.
> >
> >What if you can't deliver it?  is it possible that some other vcpu
> >will start receiving apfs that alias the old ones?  Or is the
> >broadcast global?
> >
> 
> And, is the broadcast used only for migrations?
> 
Any time apf is enabled on vcpu broadcast is sent to the vcpu. Guest should be
careful here and do not write to apf msr without a reason.

--
			Gleb.
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