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Re: [Xen-devel] Bug in PCI Passthrough?

To: Josef Vogt <josef.vogt@xxxxxxxxxx>
Subject: Re: [Xen-devel] Bug in PCI Passthrough?
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Sun, 1 May 2011 22:22:19 +0300
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On Tue, Apr 19, 2011 at 09:51:32PM +0200, Josef Vogt wrote:
> Hello all
> I tried to enable PCI Passthrough in my Debian Squeeze installation.  
> Unfortunately, it didnt work. The following bug showed up (excerpt from  
> dmesg):
> [ 10.148612] uhci_hcd 0000:00:14.2: PCI INT D -> Link[LNKD] -> GSI 11
> (level, low) -> IRQ 11
> [ 4.678352] Failed to setup GSI :11, err_code:-22
> [ 4.678480] dmfe 0000:00:0e.0: PCI INT A -> Link[LNKB] -> GSI 11 (level,
> low) -> IRQ 11
> [ 6.868419] Failed to setup GSI :10, err_code:-22
> Strange thing is, it worked perfectly with Debian Lenny Kernel 2.6.26 [1]
> I first thought, it was a Debian bug[2], but then I tried the vanilla  
> kernel (xen/stable-2.6.32.x from kernel.org) the bug was exactly the  
> same. See also [1] for the the exact error messages.
> I also tried to get help from xen users list [3].
> Strange side note: It seems to work with opensuse 11.2 (kernel 3.6.31)  
> and also Opensuse 11.3 (kernel 3.6.34) ??? I installed them both but 
> didnt get the above error message. The interrupts were assigned 
> correctly. So i started looking at the code, but the used code in 
> Opensuse looks quite different to the xen code in kernel.org. (I didn't 
> find xen.c, where the error message ???Failed to setup GSI??? is 
> located). Is it possible that Opensuse uses Xen source code from an older 
> branch?

Novell/SLES/Opensuse xen kernels are based on the traditional xenlinux patches,
while upstream kernel.org (and xen.git) has the new pvops-based xen support.

The traditional xenlinux patches will never be merged to upstream Linux,
so users and vendors should focus on the pvops Xen code nowadays..

-- Pasi

> I also compiled xen/next-2.6.39 (up to this commit:  
> 6f3ba85fbef08ce0d833a1943827454b3e5532b7) but then, unfortunately the  
> dom0 crashes.
> All the above together (except the dom0 crash in 2.6.39, of course)  
> let's me think, this could a bug in xen source code.
> Greetings!
> Josef
> [1] http://lists.xensource.com/archives/html/xen-users/2011-01/msg00411.html
> [2] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610832
> [3] http://lists.xensource.com/archives/html/xen-users/2011-01/msg00388.html
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