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Re: [Xen-users] Re: [Xen-devel] pci-passthrough in pvops causing offline

To: Mark Adams <mark@xxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Re: [Xen-devel] pci-passthrough in pvops causing offline raid
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Mon, 15 Nov 2010 12:15:44 -0500
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, "JBeulich@xxxxxxxxxx" <JBeulich@xxxxxxxxxx>
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On Sun, Nov 14, 2010 at 05:15:02PM +0000, Mark Adams wrote:
> On 12 Nov 2010, at 22:22, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
> wrote:
> > On Fri, Nov 12, 2010 at 05:10:58PM +0000, Mark Adams wrote:
> >> On Thu, Nov 11, 2010 at 02:06:58PM -0500, Konrad Rzeszutek Wilk wrote:
> >>>> I've just noticed this at the end of xm dmesg
> >>>> 
> >>>> (XEN) msi.c:715: MSI is already in use on device 02:00.0
> >>>> (XEN) msi.c:715: MSI is already in use on device 02:00.0
> >>>> (XEN) msi.c:715: MSI is already in use on device 02:00.0

Looking briefly at the code it means that somebody enabled the MSI
already on the device and did not disable them. But I wonder how
you got those in the first place. Did you use xen-pciback.hide (for PVOPS 
or pciback.hide (for older kernels) to "hide" the devices away from the
Linux Dom0 kernel?

> > I was going to look in the source today to get an idea but never got to 
> > it...
> > 
> > You might, as I mentioned in earlier emails, try to setup a serial console
> > or netconsole and log the Linux kernel output when it hangs/fails.
> > 
> can't do this unfortunately, the server
> Is in use so not able to just let it hang again... The passthrough is not in 
> use now until I think there is some possible solution to get rid of the MSI 
> conflict (when it won't hang anymore!)

Didn't you say that you had two servers and saw this problem on another
box too?

Without more details on the Xen hypervisor line or the kernel line when
the failure occurs I sadly can't help you.

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