[Xen-users] Guest domain with PCI frontend disabled IRQ, backend device dies

[Itai Tavor <itai@xxxxxxxxx>]

Hi,

I'm having a problem with a guest domain which is using PCI cards.  
The symptom is that as soon as one of the cards is accessed in the  
guest, the guest's console shows "Disabled IRQ #16" and the whole  
system loses networking. Networking is restored when I shut down the  
guest.
In the guest IRQ 16 is assigned to the PCI card, but in the host it's  
assigned to the ethernet controller.
Not sure what information would be useful for diagnosing this... here  
are a few details:
AMD Athlon 64 on ASUS A8N-SLI Premium
Xen unstable from 5/19/06
Dom0 and domU systems are both Debian 3.1

Dom0 kernel commaind line:
/boot/vmlinuz-2.6-xen0 root=/dev/sdc1 ro console=tty0 max_loop=64  
pciback.hide=(05:06.0)(05:06.2)(05:07.0)(05:07.2)(05:08.0)(05:08.1) 
(00:02.0)(00:02.1) noapic
DomU config (relevant part):

pci=[
      '00:02.0',                        # USB
      '05:06.0', '05:06.2',             # DVB-T tuner 1
      '05:07.0', '05:07.2',             # DVB-T tuner 2
      '05:08.0', '05:08.1',             # Video capture
    ]
extra = "noapic acpi=off"

DomU lspci:
0000:00:02.0 USB Controller: nVidia Corporation CK804 USB Controller  
(rev a2)
0000:05:06.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI  
Video and Audio Decoder (rev 05)
0000:05:06.2 Multimedia controller: Conexant CX23880/1/2/3 PCI Video  
and Audio Decoder [MPEG Port] (rev 05)
0000:05:07.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI  
Video and Audio Decoder (rev 05)
0000:05:07.2 Multimedia controller: Conexant CX23880/1/2/3 PCI Video  
and Audio Decoder [MPEG Port] (rev 05)
0000:05:08.0 Multimedia video controller: Brooktree Corporation Bt878  
Video Capture (rev 11)
0000:05:08.1 Multimedia controller: Brooktree Corporation Bt878 Audio  
Capture (rev 11)
Dom0 /proc/interrupts:
           CPU0
  1:        269        Phys-irq  i8042
  8:          0        Phys-irq  rtc
  9:          0        Phys-irq  acpi
14:         37        Phys-irq  ide0
15:        237        Phys-irq  ide1
16:   14779398        Phys-irq  sk98lin
21:          0        Phys-irq  libata
22:      76699        Phys-irq  libata
23:    2746987        Phys-irq  libata
...

DomU /proc/interrupts:
           CPU0
16:      41475        Phys-irq  cx88[1], cx88[1]
17:          2        Phys-irq  bttv0
18:          0        Phys-irq  cx88[0], cx88[0]
20:         14        Phys-irq  ohci_hcd:usb1
256:      24879     Dynamic-irq  timer0
257:        287     Dynamic-irq  xenbus
258:        436     Dynamic-irq  xencons
259:       3547     Dynamic-irq  blkif
260:         68     Dynamic-irq  blkif
261:          1     Dynamic-irq  blkif
262:       3170     Dynamic-irq  eth0
NMI:          0
ERR:          0

Any ideas why this is happening or what I can do about it?

TIA, Itai

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