linux-kernel - Re: [PATCH v6 06/12] Add PV MSR to enable asynchronous page faults delivery.

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Message-ID: <20101007175943.GH2397@redhat.com>
Date:	Thu, 7 Oct 2010 19:59:43 +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 06/12] Add PV MSR to enable asynchronous page faults
 delivery.

On Thu, Oct 07, 2010 at 02:58:26PM +0200, Avi Kivity wrote:
>  On 10/04/2010 05:56 PM, Gleb Natapov wrote:
> >+
> >+	Physical address points to 32 bit memory location that will be written
> >+	to by the hypervisor at the time of asynchronous page fault injection to
> >+	indicate type of asynchronous page fault. Value of 1 means that the page
> >+	referred to by the page fault is not present. Value 2 means that the
> >+	page is now available.
> 
> "The must not enable interrupts before the reason is read, or it may
> be overwritten by another apf".
> 
> Document the fact that disabling interrupts disables APFs.
> 
> How does the guest distinguish betweem APFs and ordinary page faults?
> 
> What's the role of cr2?
> 
> When disabling APF, all pending APFs are flushed and may or may not
> get a completion.
> 
> Is a "page available" notification guaranteed to arrive on the same
> vcpu that took the "page not present" fault?
> 
You mean documentation is lacking? :)

--
			Gleb.
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