From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [RFC PATCH] PCI: Introduce INTx check & mask API
Date: Tue, 05 Jun 2012 11:39:42 +1000
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References: <4FBDE6D6.80700@ozlabs.ru> <4FBE2349.6040800@siemens.com>
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Cc: kvm@vger.kernel.org, Alexey Kardashevskiy <aik@ozlabs.ru>,
	qemu-devel@nongnu.org, Alex Graf <agraf@suse.de>,
	Alex Williamson <alex.williamson@redhat.com>,
	David Gibson <david@gibson.dropbear.id.au>
To: Jan Kiszka <jan.kiszka@siemens.com>
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On Thu, 2012-05-24 at 09:02 -0300, Jan Kiszka wrote:
> 
> Since PCI 2.3, this bit is mandatory, and it should be independent of
> the masking bit. The question is, if your device is supposed to support
> 2.3, thus is just buggy, 

It's a PCI Express device :-)

> or if our detection algorithm is unreliable. It
> basically builds on the assumption that, if we can flip the mask bit,
> the feature should be present. I guess that is the best we can do. Maybe
> we can augment this with a blacklist of devices that "support" flipping
> without actually providing the feature.

Cheers,
Ben.