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Date: Mon, 17 Jan 2011 17:00:57 +0100
From: Alexander Graf <agraf@suse.de>
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Subject: [Qemu-devel] Re: [PATCH 8/8] ahci: fix !msi interrupts
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Joerg Roedel <Joerg.Roedel@amd.com>, Sebastian Herbszt <herbszt@gmx.de>, qemu-devel Developers <qemu-devel@nongnu.org>, Gerd Hoffmann <kraxel@redhat.com>

Jan Kiszka wrote:
> On 2010-12-20 22:13, Alexander Graf wrote:
>   
>> When not using MSI, receiving an interrupt while the interrupt line is active
>> pulses the interrupt line. Without this, guests don't realize that a new
>> interrupt occured.
>>     
>
> This doesn't look OK. The device model should look at the currently used
> mode and switch between edge and level triggering accordingly. As it
> appears like this is what it already does, this change may just paper
> over the real issue.
>   

Well, I have this internal abstraction to make edge and level triggered
interrupt triggering easier. irq_lower is a simple nop for the edge case.


Alex