linux-kernel - Re: [PATCH v6 08/12] Handle async PF in a guest.

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Date:	Thu, 07 Oct 2010 13:48:17 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Gleb Natapov <gleb@...hat.com>, 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,
	cl@...ux-foundation.org, mtosatti@...hat.com
Subject: Re: [PATCH v6 08/12] Handle async PF in a guest.

On 10/07/2010 01:18 PM, Avi Kivity wrote:
> On 10/07/2010 07:14 PM, Gleb Natapov wrote:

>> Host side keeps track of outstanding apfs and will not send apf for the
>> same phys address twice. It will halt vcpu instead.
>
> What about different pages, running the scheduler code?
>
> Oh, and we'll run the scheduler recursively.

When preempt is disabled in the guest, it will not invoke
the "reschedule for apf" code, but it will simply turn
into a normal page fault.

Last I looked, the scheduler code disabled preempt (for
obvious reasons).

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