linux-kernel - Re: [PATCH v4 11/12] Let host know whether the guest can handle async PF in non-userspace context.

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Message-ID: <4C3553E2.7020607@redhat.com>
Date:	Thu, 08 Jul 2010 00:28:18 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	kvm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, avi@...hat.com, mingo@...e.hu,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, hpa@...or.com,
	cl@...ux-foundation.org, mtosatti@...hat.com
Subject: Re: [PATCH v4 11/12] Let host know whether the guest can handle async
 PF in non-userspace context.

On 07/06/2010 12:24 PM, Gleb Natapov wrote:
> If guest can detect that it runs in non-preemptable context it can
> handle async PFs at any time, so let host know that it can send async
> PF even if guest cpu is not in userspace.

The code looks correct.  One question though - is there a
reason to implement the userspace-only async PF path at
all, since the handling of async PF in non-userspace context
is introduced simultaneously?

> Signed-off-by: Gleb Natapov<gleb@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

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