Re: [Qemu-devel] [RFC PATCH] PCI: Introduce INTx check & mask API

[Benjamin Herrenschmidt]

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.