Re: [Xen-devel] get_callback_via for Windows PV drivers

To:	James Harper <james.harper@xxxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] get_callback_via for Windows PV drivers
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Fri, 28 Sep 2007 14:05:43 +0100
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On 28/9/07 12:15, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

>> Neither of these values is determinable from the
>> interrupt vector. However, if you have probed the PCI device then you
>> probably know the (bus,dev,fn,pin) tuple, so you should probably aim
> to
>> specify that.
> 
> I can get bus, dev, and fn, but can't seem to find 'pin' from the
> information that Windows gives me... if 28 isn't the GSI, then I'll have
> to look harder for this 'pin' number in the windows structures...

Read byte 0x3d in the PCI device config space. That returns the pin index.

> What is the simplest thing I could do to get the hypervisor to trigger
> an interrupt? That would tell me for sure that it's working. I have only
> implemented a tiny bit of the event channel logic, and no xen bus stuff
> yet...

Implement a simple console driver to talk to xenconsoled, perhaps?

 -- Keir



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