Re: [Xen-devel] evtchn_upcall_mask for PV-on-HVM

To:	"Tian, Kevin" <kevin.tian@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] evtchn_upcall_mask for PV-on-HVM
From:	Keir Fraser <keir@xxxxxxxxxxxxx>
Date:	Thu, 30 Nov 2006 09:09:04 +0000
Cc:	"Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>
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On 30/11/06 07:05, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:

> Anyway, we'd like to know whether this is a real bug. If yes, it may
> have some impact on performance, and then people may clear the
> evtchn_upcall_mask either at domain creation time or at callback_irq
> setting time. In any case, this field does nothing for HVM domain since
> the latter already has 'rflags.if' for same purpose.

Local_events_need_delivery() should check for pending APIC/PIC interrupts on
HVM. That'll fix the block() wakeup-waiting race too.

 -- Keir


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