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

[Mark Adams <mark@campbell-lange.net>]

> > > > > >>>> 
> > > > > >>>> (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 kernels)
> > > > or pciback.hide (for older kernels) to "hide" the devices away from the
> > > > Linux Dom0 kernel?
> > > 
> > > using xen-pciback.hide as its a pvops kernel (debian squeeze
> > > 2.6.32-5-27)
> > 
> > Ok. Then it might be worth looking in when this happens. I think
> > there is an argument on the Xen hyperisor line to include the time-stamp, but
> > I don't remember it :-(
> > 

I've got a test setup in place now, and am trying to reproduce this.
I've not connected up serial as yet, but can see the following logs in
the qemu-dm log file when I get the "MSI is already in use" errors
above. Note also that this error -always- shows for the first specified
device in the pci= field, and not the 2nd.

pt_msixctrl_reg_write: guest enabling MSI-X, disable MSI-INTx translation
pci_intx: intx=1
pt_msix_update_one: Update msix entry 0 with pirq 4d gvec 59
pt_msix_update_one: Update msix entry 1 with pirq 4c gvec 61
pt_msix_update_one: Update msix entry 2 with pirq 4b gvec 69
pt_msixctrl_reg_write: guest enabling MSI-X, disable MSI-INTx translation
pci_intx: intx=2

I have also seen the following log just once, not sure if it's related:

(XEN) domctl.c:811:d0 XEN_DOMCTL_test_assign_device: 2:0.0 already assigned, or non-existent

Does this help at all with debugging my issues?

Regards,
Mark