linux-kernel - Re: [PATCH v3 00/12] KVM: Add host swap event notifications for PV guest

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Date:	Wed, 6 Jan 2010 12:21:29 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Jun Koi <junkoi2004@...il.com>
Cc:	Avi Kivity <avi@...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,
	riel@...hat.com, cl@...ux-foundation.org
Subject: Re: [PATCH v3 00/12] KVM: Add host swap event notifications for PV
 guest

On Wed, Jan 06, 2010 at 07:17:30PM +0900, Jun Koi wrote:
> On Wed, Jan 6, 2010 at 1:04 AM, Avi Kivity <avi@...hat.com> wrote:
> > On 01/05/2010 05:05 PM, Jun Koi wrote:
> >>
> >> Is it true that to make this work, we will need a (PV) kernel driver
> >> for each guest OS (Windows, Linux, ...)?
> >>
> >>
> >
> > It's partially usable even without guest modifications; while servicing a
> > host page fault we can still deliver interrupts to the guest (which might
> > cause a context switch and thus further progress to be made).
> 
> Lets say, in the case the guest has no PV driver. When we find that a
> guest page is swapped out, we can send a pagefault
> to the guest to trick it to load that page in. And we dont need the
> driver at all.
> 
That's not the guest who should load the page. From guest's point of view the
page is in memory.

> Is that a reasonable solution?
> 
> Thanks,
> J

--
			Gleb.
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