linux-kernel - Re: [PATCH 02/11] Add "handle page fault" PV helper.

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Message-ID: <4AEF6CC3.4000508@redhat.com>
Date:	Mon, 02 Nov 2009 18:35:31 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, Gleb Natapov <gleb@...hat.com>,
	kvm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 02/11] Add "handle page fault" PV helper.

On 11/02/2009 02:33 PM, Avi Kivity wrote:
> On 11/02/2009 09:03 PM, Rik van Riel wrote:
>>> This patch is not acceptable unless it's done cleaner. Currently we
>>> already have 3 callbacks in do_page_fault() (kmemcheck, mmiotrace,
>>> notifier), and this adds a fourth one.
>>
>>
>> There's another alternative - add our own exception vector
>> for async page faults. Not sure if that is warranted though,
>> especially if we already have other callbacks in do_page_fault()
>> and we can consolidate them.
>>
>
> We can't add an exception vector since all the existing ones are either
> taken or reserved.

I believe some are reserved for operating system use.

That means the guest can pick one and tell the host to use
that one to notify it.

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