linux-kernel - Re: [PATCH v3 04/12] Add "handle page fault" PV helper.

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Message-ID: <4B573AEF.9010007@redhat.com>
Date:	Wed, 20 Jan 2010 12:18:39 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Gleb Natapov <gleb@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>, kvm@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de, cl@...ux-foundation.org
Subject: Re: [PATCH v3 04/12] Add "handle page fault" PV helper.

On 01/20/2010 07:00 AM, Avi Kivity wrote:
> On 01/20/2010 12:02 PM, Gleb Natapov wrote:
>>
>> I can inject the event as HW interrupt on vector greater then 32 but not
>> go through APIC so EOI will not be required. This sounds
>> non-architectural
>> and I am not sure kernel has entry point code for this kind of event, it
>> has one for exception and one for interrupts that goes through __do_IRQ()
>> which assumes that interrupts should be ACKed.
>
> Further, we start to interact with the TPR; Linux doesn't use the TPR or
> cr8 but if it does one day we don't want it interfering with apf.

That's not an issue is it?  The guest will tell the host what
vector to use for pseudo page faults.

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