linux-kernel - Re: [Xen-devel] Re: [GIT PATCH v2 0/14] xen: events: cleanups + ween off nr

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Message-ID: <20110311003841.GA3063@dumpdata.com>
Date:	Thu, 10 Mar 2011 19:38:41 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [Xen-devel] Re: [GIT PATCH v2 0/14] xen: events: cleanups +
 ween off nr_irqs

> I am having difficulties with passthrough of an USB device. Somehow the
> irq count is not going up at all (both in dom0 and domU) and it looks to
> be doing just simple polling. I've rebased the xen-pciback to be on top
> of your changes and apply cleanly. The whole lot is now in #master

I think your patchset breaks the 'xc_physdev_map_pirq' call. Looks like
libxl_pci.c reads from /sys/bus/pci/devices/<BDF>/irq to figure out what value
to pass. With these patches we wouldn't neccessarily pass in the right
PIRQ value. Any ideas?

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