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Re: [Xen-devel] Question about evtchn_callback reentry

To: "Xu, Anthony" <anthony.xu@xxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Question about evtchn_callback reentry
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Wed, 20 Dec 2006 08:31:10 +0000
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On 20/12/06 3:03 am, "Xu, Anthony" <anthony.xu@xxxxxxxxx> wrote:

>> Okay, so I remember now that of course the APIC divides these into 16
>> priority levels so that does rather restrict the maximum nesting.
>> I'll be happy to consider adding prioritisation (or just complete
>> disallow of nesting) for 3.0.5.
> Hi Keir,
> I did a experiment,
> If we completely disallow of nesting.
> Even dom0 can't boot.
> I suspected timer interrupt is blocked by other events.

How did you implement nesting avoidance? It'll be a bit subtle to get right.

 -- Keir

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