Hello, 
    since an upgrade from Debian lenny, which was running on our
    Dell-Server since 2009, we are now having problems with the
    Passthrough of an PCI-USB-Controller which shares its IRQ 11 with 2
    other PCI-Devices. 
     
    A PCI-Device whichs IRQ 35 is not shared can be attached to the
    guest and works perfectly. This new behavior with the IRQ-shared
    USB-Controller has begun after the update of DomO and DomU to Debian
    squeeze/stable. The former configuration was: 
     
    DomO: 
    Kernel: 2.6.26-2-xen-amd64 (2.6.26-26lenny1) 
    Xen-Hypervisor: 3.2-1-amd64  (3.2.1-2) 
     
    DomU: 
    Kernel: linux-image-2.6.26-2-xen-686 (2.6.26-26lenny3) 
     
    Running DomU with the the old 2.6.26 Kernel doesn't solve the
    problem. Running DomO with the old configuration would be a greater
    downgrade because of incompatibilities between drbd-modules and
    drbd-userlevel tools, which needs old lenny archives. 
     
    The actual Xen running now is from Debian's stable squeeze
    release with DomO and DomU Kernel 2.6.32-5-xen: 
     
    DomO: 
    #uname -a 
    Linux arche1 2.6.32-5-xen-amd64 #1 SMP Tue Jun 14 12:46:30
        UTC 2011 x86_64 GNU/Linux 
     
    #cat /proc/cmdline 
    placeholder root=UUID=6361b25e-fde8-4e33-9599-7fd807fefe4d
        ro xen-pciback.hide=(00:03.0) 
     
    DomU: 
    #uname -a 
    Linux slspaddev 2.6.32-5-xen-686 #1 SMP Mon Jun 13 09:07:50
        UTC 2011 i686 GNU/Linux 
     
    #cat /proc/cmdline 
    root=/dev/xvda1 ro console=tty0 iommu=soft swiotlb=force 
     
    DomO: 
    #xm info 
    host                   : arche1 
      release                : 2.6.32-5-xen-amd64 
      version                : #1 SMP Tue Jun 14 12:46:30 UTC 2011 
      machine                : x86_64 
      nr_cpus                : 8 
      nr_nodes               : 2 
      cores_per_socket       : 4 
      threads_per_core       : 1 
      cpu_mhz                : 2294 
      hw_caps                :
      178bf3ff:efd3fbff:00000000:00001310:00802001:00000000:000037ff:00000000 
      virt_caps              : hvm 
      total_memory           : 16378 
      free_memory            : 1358 
      node_to_cpu            : node0:0,2,4,6 
                               node1:1,3,5,7 
      node_to_memory         : node0:488 
                               node1:869 
      node_to_dma32_mem      : node0:3 
                               node1:0 
      max_node_id            : 1 
      xen_major              : 4 
      xen_minor              : 0 
      xen_extra              : .1 
      xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p
      hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64  
      xen_scheduler          : credit 
      xen_pagesize           : 4096 
      platform_params        : virt_start=0xffff800000000000 
      xen_changeset          : unavailable 
      xen_commandline        : placeholder 
      cc_compiler            : gcc version 4.4.5 (Debian 4.4.5-10)  
      cc_compile_by          : waldi 
      cc_compile_domain      : debian.org 
      cc_compile_date        : Wed Jan 12 14:04:06 UTC 2011 
      xend_config_format     : 4 
     
     
    #xm dmesg 
    (XEN) Xen version 4.0.1 (Debian 4.0.1-2) (waldi@xxxxxxxxxx) (gcc
      version 4.4.5 (Debian 4.4.5-10) ) Wed Jan 12 14:04:06 UTC 2011 
      (XEN) Bootloader: GRUB 1.98+20100804-14 
      (XEN) Command line: placeholder 
      (XEN) Video information: 
      (XEN)  VGA is text mode 80x25, font 8x16 
      (XEN)  VBE/DDC methods: none; EDID transfer time: 2 seconds 
      (XEN)  EDID info not retrieved because no DDC retrieval method
      detected 
      (XEN) Disc information: 
      (XEN)  Found 1 MBR signatures 
      (XEN)  Found 1 EDD information structures 
      (XEN) Xen-e820 RAM map: 
      (XEN)  0000000000000000 - 00000000000a0000 (usable) 
      (XEN)  0000000000100000 - 00000000bfac0000 (usable) 
      (XEN)  00000000bfac0000 - 00000000bfad6000 (reserved) 
      (XEN)  00000000bfad6000 - 00000000bfaf5c00 (ACPI data) 
      (XEN)  00000000bfaf5c00 - 00000000c0000000 (reserved) 
      (XEN)  00000000f0000000 - 00000000f8000000 (reserved) 
      (XEN)  00000000fe000000 - 0000000100000000 (reserved) 
      (XEN)  0000000100000000 - 0000000440000000 (usable) 
      (XEN) ACPI: RSDP 000F2210, 0024 (r2 DELL  ) 
      (XEN) ACPI: XSDT 000F228C, 008C (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: FACP BFAF1BD8, 00F4 (r3 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: DSDT BFAD6000, 476A (r1 DELL   PE_SC3          1 INTL
      20050624) 
      (XEN) ACPI: FACS BFAF4400, 0040 
      (XEN) ACPI: APIC BFAF1878, 00A0 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: SPCR BFAF191C, 0050 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: HPET BFAF1970, 0038 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: MCFG BFAF19AC, 003C (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: SLIC BFAF19EC, 0024 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: ERST BFADA8EC, 0210 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: HEST BFADAAFC, 027C (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: BERT BFADA76C, 0030 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: EINJ BFADA79C, 0150 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: SRAT 000FC144, 0150 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: SSDT BFAF4800, 10F4 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: TCPA BFAF1B70, 0064 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) System RAM: 16378MB (16771456kB) 
      (XEN) Domain heap initialised DMA width 31 bits 
      (XEN) Processor #0 0:4 APIC version 16 
      (XEN) Processor #4 0:4 APIC version 16 
      (XEN) Processor #1 0:4 APIC version 16 
      (XEN) Processor #5 0:4 APIC version 16 
      (XEN) Processor #2 0:4 APIC version 16 
      (XEN) Processor #6 0:4 APIC version 16 
      (XEN) Processor #3 0:4 APIC version 16 
      (XEN) Processor #7 0:4 APIC version 16 
      (XEN) IOAPIC[0]: apic_id 8, version 17, address 0xfec00000, GSI
      0-15 
      (XEN) IOAPIC[1]: apic_id 9, version 17, address 0xfec01000, GSI
      32-47 
      (XEN) IOAPIC[2]: apic_id 10, version 17, address 0xfec02000, GSI
      64-79 
      (XEN) Enabling APIC mode:  Flat.  Using 3 I/O APICs 
      (XEN) Using scheduler: SMP Credit Scheduler (credit) 
      (XEN) Detected 2294.328 MHz processor. 
      (XEN) Initing memory sharing. 
      (XEN) HVM: ASIDs enabled. 
      (XEN) HVM: SVM enabled 
      (XEN) HVM: Hardware Assisted Paging detected. 
      (XEN) AMD-Vi: IOMMU not found! 
      (XEN) I/O virtualisation disabled 
      (XEN) Total of 8 processors activated. 
      (XEN) ENABLING IO-APIC IRQs 
      (XEN)  -> Using new ACK method 
      (XEN) TSC is reliable, synchronization unnecessary 
      (XEN) Platform timer appears to have unexpectedly wrapped 1 times. 
      (XEN) Platform timer is 14.318MHz HPET 
      (XEN) Allocated console ring of 16 KiB. 
      (XEN) Brought up 8 CPUs 
      (XEN) *** LOADING DOMAIN 0 *** 
      (XEN)  Xen  kernel: 64-bit, lsb, compat32 
      (XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 ->
      0x16ba000 
      (XEN) PHYSICAL MEMORY ARRANGEMENT: 
      (XEN)  Dom0 alloc.:   0000000230000000->0000000238000000
      (4080652 pages to be allocated) 
      (XEN) VIRTUAL MEMORY ARRANGEMENT: 
      (XEN)  Loaded kernel: ffffffff81000000->ffffffff816ba000 
      (XEN)  Init. ramdisk: ffffffff816ba000->ffffffff832d7200 
      (XEN)  Phys-Mach map: ffffffff832d8000->ffffffff8523a060 
      (XEN)  Start info:    ffffffff8523b000->ffffffff8523b4b4 
      (XEN)  Page tables:   ffffffff8523c000->ffffffff85269000 
      (XEN)  Boot stack:    ffffffff85269000->ffffffff8526a000 
      (XEN)  TOTAL:         ffffffff80000000->ffffffff85400000 
      (XEN)  ENTRY ADDRESS: ffffffff81509200 
      (XEN) Dom0 has maximum 8 VCPUs 
      (XEN) Scrubbing Free RAM: .done. 
      (XEN) Xen trace buffers: disabled 
      (XEN) Std. Loglevel: Errors and warnings 
      (XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings) 
      (XEN) Xen is relinquishing VGA console. 
      (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to
      switch input to Xen) 
      (XEN) Freed 176kB init memory. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010004 from
      0000995d:bf92b427 to 00000000:00000000. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010000 from
      00000306:851554ec to 00000000:00430076. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
     
    (the guest DomU is running at this moment, but the PCI-Device is not
    attached yet. The upper output of "xm dmesg" does not change between
    xen with no running guest 
    and starting a single guest) 
     
    As you can see from the DomO's Kernel-parameter "xen-pciback.hide=(00:03.0)"
    the PCI Device to be passed through has the ID 00:03.0 . 
    An extract from # lspci -vv on DomO shows this Device with the
    others sharing IRQ 11: 
     
    DomO: 
    # lspci -vv 
    ... 
    00:03.0 USB Controller: Broadcom BCM5785 [HT1000] USB (rev 01)
      (prog-if 10 [OHCI]) 
              Subsystem: Dell PowerEdge 2970 HT1000 USB Controller 
              Control: I/O- Mem- BusMaster- SpecCycle- MemWINV-
      VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- 
              Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
      >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
              Interrupt: pin A routed to IRQ 11 
              Region 0: Memory at ee4ed000 (32-bit, non-prefetchable)
      [disabled] [size=4K] 
              Region 1: I/O ports at b000 [disabled] [size=256] 
              Capabilities: [dc] Power Management version 2 
                      Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
      PME(D0-,D1-,D2-,D3hot-,D3cold-) 
                      Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0
      PME- 
                      Bridge: PM- B3+ 
              Kernel driver in use: pciback 
       
      00:03.1 USB Controller: Broadcom BCM5785 [HT1000] USB (rev 01)
      (prog-if 10 [OHCI]) 
              Subsystem: Dell PowerEdge 2970 HT1000 USB Controller 
              Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+
      VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx- 
              Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
      >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
              Latency: 64, Cache Line Size: 64 bytes 
              Interrupt: pin A routed to IRQ 11 
              Region 0: Memory at ee4ee000 (32-bit, non-prefetchable)
      [size=4K] 
              Region 1: I/O ports at b400 [size=256] 
              Capabilities: [dc] Power Management version 2 
                      Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
      PME(D0-,D1-,D2-,D3hot-,D3cold-) 
                      Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0
      PME- 
                      Bridge: PM- B3+ 
              Kernel driver in use: ohci_hcd 
       
      00:03.2 USB Controller: Broadcom BCM5785 [HT1000] USB (rev 01)
      (prog-if 20 [EHCI]) 
              Subsystem: Dell PowerEdge 2970 HT1000 USB Controller 
              Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+
      VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx- 
              Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
      >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
              Latency: 64, Cache Line Size: 64 bytes 
              Interrupt: pin A routed to IRQ 11 
              Region 0: Memory at ee4ef000 (32-bit, non-prefetchable)
      [size=4K] 
              Region 1: I/O ports at b800 [size=256] 
              Capabilities: [dc] Power Management version 2 
                      Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
      PME(D0+,D1+,D2+,D3hot+,D3cold-) 
                      Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0
      PME- 
                      Bridge: PM- B3+ 
              Kernel driver in use: ehci_hcd 
    ... 
     
    The PCI-Device with the unshared IRQ 35 works after attaching it to
    a guest and looks like this in lspci -vv: 
     
    ... 
      0c:00.0 SCSI storage controller: LSI Logic / Symbios Logic
      SAS1068E PCI-Express Fusion-MPT SAS (rev 08) 
          Subsystem: Hewlett-Packard Company SC44Ge Host Bus Adapter 
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
      ParErr- Stepping- SERR- FastB2B- DisINTx- 
          Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast
      >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
          Latency: 0, Cache Line Size: 64 bytes 
          Interrupt: pin A routed to IRQ 35 
          Region 0: I/O ports at cc00 [size=256] 
          Region 1: Memory at ee3ec000 (64-bit, non-prefetchable)
      [size=16K] 
          Region 3: Memory at ee3f0000 (64-bit, non-prefetchable)
      [size=64K] 
          Expansion ROM at ee000000 [disabled] [size=2M] 
          Capabilities: [50] Power Management version 2 
              Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
      PME(D0-,D1-,D2-,D3hot-,D3cold-) 
              Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- 
          Capabilities: [68] Express (v1) Endpoint, MSI 00 
              DevCap:    MaxPayload 4096 bytes, PhantFunc 0, Latency L0s
      <64ns, L1 <1us 
                  ExtTag+ AttnBtn- AttnInd- PwrInd- RBE- FLReset- 
              DevCtl:    Report errors: Correctable- Non-Fatal- Fatal+
      Unsupported- 
                  RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ 
                  MaxPayload 512 bytes, MaxReadReq 512 bytes 
              DevSta:    CorrErr- UncorrErr- FatalErr- UnsuppReq-
      AuxPwr- TransPend- 
              LnkCap:    Port #0, Speed 2.5GT/s, Width x8, ASPM L0s L1,
      Latency L0 <64ns, L1 <1us 
                  ClockPM- Surprise- LLActRep- BwNot- 
              LnkCtl:    ASPM Disabled; RCB 64 bytes Disabled- Retrain-
      CommClk- 
                  ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- 
              LnkSta:    Speed 2.5GT/s, Width x8, TrErr- Train- SlotClk-
      DLActive- BWMgmt- ABWMgmt- 
          Capabilities: [98] MSI: Enable- Count=1/1 Maskable- 64bit+ 
              Address: 0000000000000000  Data: 0000 
          Capabilities: [b0] MSI-X: Enable- Count=1 Masked- 
              Vector table: BAR=1 offset=00002000 
              PBA: BAR=1 offset=00003000 
          Capabilities: [100 v1] Advanced Error Reporting 
              UESta:    DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt-
      UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- 
              UEMsk:    DLP- SDES- TLP- FCP- CmpltTO+ CmpltAbrt+
      UnxCmplt+ RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol- 
              UESvrt:    DLP+ SDES- TLP+ FCP+ CmpltTO- CmpltAbrt-
      UnxCmplt- RxOF+ MalfTLP+ ECRC+ UnsupReq- ACSViol- 
              CESta:    RxErr- BadTLP- BadDLLP- Rollover- Timeout-
      NonFatalErr- 
              CEMsk:    RxErr- BadTLP+ BadDLLP+ Rollover+ Timeout+
      NonFatalErr- 
              AERCap:    First Error Pointer: 00, GenCap+ CGenEn-
      ChkCap+ ChkEn- 
          Kernel driver in use: pciback 
      ... 
     
    I added this SAS-Controller manually after booting to the pciback
    slots for demonstration. Its not part of the DomO's xen-pciback.hide
    Kernel-parameter. 
     
    The interrupts on DomO are as follows. No PCI Device is attached to
    the already running guest domU yet. 
     
    DomO: 
    # cat /proc/interrupts 
                CPU0       CPU1       CPU2       CPU3      
      CPU4       CPU5       CPU6       CPU7        
         1:          2          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  i8042 
         8:          0          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  rtc0 
         9:          0          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  acpi 
        10:         94          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  sata_svw 
        11:         93          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge 
      ehci_hcd:usb1, ohci_hcd:usb2 
        12:          4          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  i8042 
        35:         66          0          0          0         
      0          0          0          0  xen-pirq-ioapic-level 
        37:      51283          0          0          0         
      0          0          0          0  xen-pirq-ioapic-level  megasas 
      2237:        471          0          0          0         
      0          0          0          0   xen-dyn-event     vif1.0 
      2238:        106          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2239:        217          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2240:       2749          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2241:      16647          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2242:       2408          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2243:          1          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:qemu-dm 
      2244:     612700          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:qemu-dm 
      2245:        154          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:qemu-dm 
      2246:        593          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:xenstored 
      2247:          0          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:xenstored 
      2248:       1406          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:xenstored 
      2249:      10065          0          0          0         
      0          0          0          0  xen-pirq-msi       peth0 
      2250:      90713          0          0          0         
      0          0          0          0  xen-pirq-msi       eth1 
      2252:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      mce 
      2257:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2258:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2259:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2260:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2261:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2262:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      pcpu 
      2263:       2605          0          0          0         
      0          0          0          0   xen-dyn-event     xenbus 
      2264:          0          0          0          0         
      0          0          0        846  xen-percpu-ipi      
      callfuncsingle7 
      2265:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug7 
      2266:          0          0          0          0         
      0          0          0         74  xen-percpu-ipi       callfunc7 
      2267:          0          0          0          0         
      0          0          0      17429  xen-percpu-ipi       resched7 
      2268:          0          0          0          0         
      0          0          0       7268  xen-percpu-virq      timer7 
      2269:          0          0          0          0         
      0          0       1250          0  xen-percpu-ipi      
      callfuncsingle6 
      2270:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug6 
      2271:          0          0          0          0         
      0          0         93          0  xen-percpu-ipi       callfunc6 
      2272:          0          0          0          0         
      0          0       4901          0  xen-percpu-ipi       resched6 
      2273:          0          0          0          0         
      0          0      35074          0  xen-percpu-virq      timer6 
      2274:          0          0          0          0          0      
      2892          0          0  xen-percpu-ipi       callfuncsingle5 
      2275:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug5 
      2276:          0          0          0          0         
      0         93          0          0  xen-percpu-ipi       callfunc5 
      2277:          0          0          0          0          0     
      19826          0          0  xen-percpu-ipi       resched5 
      2278:          0          0          0          0          0      
      6993          0          0  xen-percpu-virq      timer5 
      2279:          0          0          0          0      
      3615          0          0          0  xen-percpu-ipi      
      callfuncsingle4 
      2280:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug4 
      2281:          0          0          0          0       
      104          0          0          0  xen-percpu-ipi      
      callfunc4 
      2282:          0          0          0          0     
      20926          0          0          0  xen-percpu-ipi      
      resched4 
      2283:          0          0          0          0      
      9741          0          0          0  xen-percpu-virq      timer4 
      2284:          0          0          0       1327         
      0          0          0          0  xen-percpu-ipi      
      callfuncsingle3 
      2285:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug3 
      2286:          0          0          0         92         
      0          0          0          0  xen-percpu-ipi       callfunc3 
      2287:          0          0          0      17738         
      0          0          0          0  xen-percpu-ipi       resched3 
      2288:          0          0          0      12742         
      0          0          0          0  xen-percpu-virq      timer3 
      2289:          0          0       3016          0         
      0          0          0          0  xen-percpu-ipi      
      callfuncsingle2 
      2290:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug2 
      2291:          0          0         95          0         
      0          0          0          0  xen-percpu-ipi       callfunc2 
      2292:          0          0      20282          0         
      0          0          0          0  xen-percpu-ipi       resched2 
      2293:          0          0      20647          0         
      0          0          0          0  xen-percpu-virq      timer2 
      2294:          0       4890          0          0         
      0          0          0          0  xen-percpu-ipi      
      callfuncsingle1 
      2295:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug1 
      2296:          0         81          0          0         
      0          0          0          0  xen-percpu-ipi       callfunc1 
      2297:          0      24716          0          0         
      0          0          0          0  xen-percpu-ipi       resched1 
      2298:          0      21358          0          0         
      0          0          0          0  xen-percpu-virq      timer1 
      2299:        257          0          0          0         
      0          0          0          0  xen-percpu-ipi      
      callfuncsingle0 
      2300:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug0 
      2301:         89          0          0          0         
      0          0          0          0  xen-percpu-ipi       callfunc0 
      2302:      25100          0          0          0         
      0          0          0          0  xen-percpu-ipi       resched0 
      2303:     291909          0          0          0         
      0          0          0          0  xen-percpu-virq      timer0 
       NMI:          0          0          0          0         
      0          0          0          0   Non-maskable interrupts 
       LOC:          0          0          0          0         
      0          0          0          0   Local timer interrupts 
       SPU:          0          0          0          0         
      0          0          0          0   Spurious interrupts 
       PMI:          0          0          0          0         
      0          0          0          0   Performance monitoring
      interrupts 
       PND:          0          0          0          0         
      0          0          0          0   Performance pending work 
       RES:      25100      24716      20282      17738      20927     
      19826       4901      17429   Rescheduling interrupts 
       CAL:        346       4971       3111       1419       3719      
      2985       1343        920   Function call interrupts 
       TLB:          0          0          0          0         
      0          0          0          0   TLB shootdowns 
       TRM:          0          0          0          0         
      0          0          0          0   Thermal event interrupts 
       THR:          0          0          0          0         
      0          0          0          0   Threshold APIC interrupts 
       MCE:          0          0          0          0         
      0          0          0          0   Machine check exceptions 
       MCP:         12         12         12         12        
      12         12         12         12   Machine check polls 
       ERR:          0 
       MIS:          0 
     
    Now I'm attaching the USB-Controller to the guest. The device is
    available for xen: 
    DomO: 
    # xm pci-list-assignable 
    0000:00:03.0 
    0000:0c:00.0 
     
    # xm pci-attach slspaddev 0000:00:03.0 
     
    dmesg says now: 
     
    DomO: 
     
    [ 3859.997973] pciback: vpci: 0000:00:03.0: assign
          to virtual slot 0 
          [ 3860.004621]   alloc irq_desc for 2236 on node -1 
          [ 3860.004630]   alloc kstat_irqs on node -1 
          [ 3860.180173] pciback 0000:00:03.0: enabling device (0000
          -> 0003) 
          [ 3860.180240] xen: registering gsi 11 triggering 0 polarity 1 
          [ 3860.180249] xen_allocate_pirq: returning irq 11 for gsi 11 
          [ 3860.180296] xen: --> irq=11 
          [ 3860.180307] Already setup the GSI :11 
          [ 3860.180352] pciback 0000:00:03.0: PCI INT A ->
          Link[LK01] -> GSI 11 (level, low) -> IRQ 11 
          [ 3860.375909] pciback[0000:00:03.0] IRQ line is not shared
          with other domains. Turning ISR off 
          [ 3862.938422] irq 11: nobody cared (try booting with the
          "irqpoll" option) 
          [ 3862.938464] Pid: 0, comm: swapper Tainted: G        W 
          2.6.32-5-xen-amd64 #1 
          [ 3862.938503] Call Trace: 
          [ 3862.938532]  <IRQ>  [<ffffffff811fa808>] ?
          pciback_guest_interrupt+0x14/0x6c 
          [ 3862.938583]  [<ffffffff81096b3d>] ?
          __report_bad_irq+0x30/0x7d 
          [ 3862.938620]  [<ffffffff81096c8f>] ?
          note_interrupt+0x105/0x16e 
          [ 3862.938658]  [<ffffffff81097396>] ?
          handle_level_irq+0x80/0xc3 
          [ 3862.938696]  [<ffffffff811f1e0e>] ?
          __xen_evtchn_do_upcall+0xe1/0x175 
          [ 3862.938735]  [<ffffffff811f245c>] ?
          xen_evtchn_do_upcall+0x2e/0x42 
          [ 3862.938774]  [<ffffffff81012cfe>] ?
          xen_do_hypervisor_callback+0x1e/0x30 
          [ 3862.938811]  <EOI>  [<ffffffff810093aa>] ?
          hypercall_page+0x3aa/0x1001 
          [ 3862.938853]  [<ffffffff810093aa>] ?
          hypercall_page+0x3aa/0x1001 
          [ 3862.938891]  [<ffffffff8100e6a7>] ?
          xen_safe_halt+0xc/0x15 
          [ 3862.938927]  [<ffffffff8100bfc7>] ?
          xen_idle+0x37/0x40 
          [ 3862.938964]  [<ffffffff81010eb1>] ?
          cpu_idle+0xa2/0xda 
          [ 3862.939001]  [<ffffffff81509cdd>] ?
          start_kernel+0x3dc/0x3e8 
          [ 3862.939038]  [<ffffffff8150bc93>] ?
          xen_start_kernel+0x586/0x58a 
          [ 3862.939073] handlers: 
          [ 3862.939101] [<ffffffffa001e864>]
          (usb_hcd_irq+0x0/0x7e [usbcore]) 
          [ 3862.939162] [<ffffffffa001e864>]
          (usb_hcd_irq+0x0/0x7e [usbcore]) 
          [ 3862.939206] [<ffffffff811fa7f4>]
          (pciback_guest_interrupt+0x0/0x6c) 
          [ 3862.939248] Disabling IRQ #11 
     
     
    # xm debug-keys i 
    # xm dmesg 
     
    (XEN) Xen version 4.0.1 (Debian 4.0.1-2) (waldi@xxxxxxxxxx) (gcc
      version 4.4.5 (Debian 4.4.5-10) ) Wed Jan 12 14:04:06 UTC 2011 
      (XEN) Bootloader: GRUB 1.98+20100804-14 
      (XEN) Command line: placeholder 
      (XEN) Video information: 
      (XEN)  VGA is text mode 80x25, font 8x16 
      (XEN)  VBE/DDC methods: none; EDID transfer time: 2 seconds 
      (XEN)  EDID info not retrieved because no DDC retrieval method
      detected 
      (XEN) Disc information: 
      (XEN)  Found 1 MBR signatures 
      (XEN)  Found 1 EDD information structures 
      (XEN) Xen-e820 RAM map: 
      (XEN)  0000000000000000 - 00000000000a0000 (usable) 
      (XEN)  0000000000100000 - 00000000bfac0000 (usable) 
      (XEN)  00000000bfac0000 - 00000000bfad6000 (reserved) 
      (XEN)  00000000bfad6000 - 00000000bfaf5c00 (ACPI data) 
      (XEN)  00000000bfaf5c00 - 00000000c0000000 (reserved) 
      (XEN)  00000000f0000000 - 00000000f8000000 (reserved) 
      (XEN)  00000000fe000000 - 0000000100000000 (reserved) 
      (XEN)  0000000100000000 - 0000000440000000 (usable) 
      (XEN) ACPI: RSDP 000F2210, 0024 (r2 DELL  ) 
      (XEN) ACPI: XSDT 000F228C, 008C (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: FACP BFAF1BD8, 00F4 (r3 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: DSDT BFAD6000, 476A (r1 DELL   PE_SC3          1 INTL
      20050624) 
      (XEN) ACPI: FACS BFAF4400, 0040 
      (XEN) ACPI: APIC BFAF1878, 00A0 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: SPCR BFAF191C, 0050 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: HPET BFAF1970, 0038 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: MCFG BFAF19AC, 003C (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: SLIC BFAF19EC, 0024 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: ERST BFADA8EC, 0210 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: HEST BFADAAFC, 027C (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: BERT BFADA76C, 0030 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: EINJ BFADA79C, 0150 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: SRAT 000FC144, 0150 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: SSDT BFAF4800, 10F4 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) ACPI: TCPA BFAF1B70, 0064 (r1 DELL   PE_SC3          1
      DELL        1) 
      (XEN) System RAM: 16378MB (16771456kB) 
      (XEN) Domain heap initialised DMA width 31 bits 
      (XEN) Processor #0 0:4 APIC version 16 
      (XEN) Processor #4 0:4 APIC version 16 
      (XEN) Processor #1 0:4 APIC version 16 
      (XEN) Processor #5 0:4 APIC version 16 
      (XEN) Processor #2 0:4 APIC version 16 
      (XEN) Processor #6 0:4 APIC version 16 
      (XEN) Processor #3 0:4 APIC version 16 
      (XEN) Processor #7 0:4 APIC version 16 
      (XEN) IOAPIC[0]: apic_id 8, version 17, address 0xfec00000, GSI
      0-15 
      (XEN) IOAPIC[1]: apic_id 9, version 17, address 0xfec01000, GSI
      32-47 
      (XEN) IOAPIC[2]: apic_id 10, version 17, address 0xfec02000, GSI
      64-79 
      (XEN) Enabling APIC mode:  Flat.  Using 3 I/O APICs 
      (XEN) Using scheduler: SMP Credit Scheduler (credit) 
      (XEN) Detected 2294.317 MHz processor. 
      (XEN) Initing memory sharing. 
      (XEN) HVM: ASIDs enabled. 
      (XEN) HVM: SVM enabled 
      (XEN) HVM: Hardware Assisted Paging detected. 
      (XEN) AMD-Vi: IOMMU not found! 
      (XEN) I/O virtualisation disabled 
      (XEN) Total of 8 processors activated. 
      (XEN) ENABLING IO-APIC IRQs 
      (XEN)  -> Using new ACK method 
      (XEN) TSC is reliable, synchronization unnecessary 
      (XEN) Platform timer is 14.318MHz HPET 
      (XEN) Allocated console ring of 16 KiB. 
      (XEN) Brought up 8 CPUs 
      (XEN) *** LOADING DOMAIN 0 *** 
      (XEN)  Xen  kernel: 64-bit, lsb, compat32 
      (XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 ->
      0x16ba000 
      (XEN) PHYSICAL MEMORY ARRANGEMENT: 
      (XEN)  Dom0 alloc.:   0000000230000000->0000000238000000
      (4080652 pages to be allocated) 
      (XEN) VIRTUAL MEMORY ARRANGEMENT: 
      (XEN)  Loaded kernel: ffffffff81000000->ffffffff816ba000 
      (XEN)  Init. ramdisk: ffffffff816ba000->ffffffff832d7200 
      (XEN)  Phys-Mach map: ffffffff832d8000->ffffffff8523a060 
      (XEN)  Start info:    ffffffff8523b000->ffffffff8523b4b4 
      (XEN)  Page tables:   ffffffff8523c000->ffffffff85269000 
      (XEN)  Boot stack:    ffffffff85269000->ffffffff8526a000 
      (XEN)  TOTAL:         ffffffff80000000->ffffffff85400000 
      (XEN)  ENTRY ADDRESS: ffffffff81509200 
      (XEN) Dom0 has maximum 8 VCPUs 
      (XEN) Scrubbing Free RAM: .done. 
      (XEN) Xen trace buffers: disabled 
      (XEN) Std. Loglevel: Errors and warnings 
      (XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings) 
      (XEN) Xen is relinquishing VGA console. 
      (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to
      switch input to Xen) 
      (XEN) Freed 176kB init memory. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010004 from
      0000995d:bf92b427 to 00000000:00000000. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010000 from
      00000307:c50514ec to 00000000:00430076. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) traps.c:2308:d0 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
      (XEN) Guest interrupt information: 
      (XEN)    IRQ:   0 affinity:ffffffff,ffffffff,ffffffff,ffffffff
      vec:f0 type=IO-APIC-edge    status=00000000 mapped, unbound 
      (XEN)    IRQ:   1 affinity:00000000,00000000,00000000,00000001
      vec:28 type=IO-APIC-edge    status=00000014 in-flight=0
      domain-list=0:  1(----), 
      (XEN)    IRQ:   2 affinity:ffffffff,ffffffff,ffffffff,ffffffff
      vec:e2 type=XT-PIC          status=00000000 mapped, unbound 
      (XEN)    IRQ:   3 affinity:00000000,00000000,00000000,000000ff
      vec:30 type=IO-APIC-edge    status=00000002 mapped, unbound 
      (XEN)    IRQ:   4 affinity:00000000,00000000,00000000,000000ff
      vec:38 type=IO-APIC-edge    status=00000002 mapped, unbound 
      (XEN)    IRQ:   5 affinity:00000000,00000000,00000000,00000001
      vec:40 type=IO-APIC-edge    status=00000002 mapped, unbound 
      (XEN)    IRQ:   6 affinity:00000000,00000000,00000000,00000001
      vec:48 type=IO-APIC-edge    status=00000002 mapped, unbound 
      (XEN)    IRQ:   7 affinity:00000000,00000000,00000000,00000001
      vec:50 type=IO-APIC-edge    status=00000002 mapped, unbound 
      (XEN)    IRQ:   8 affinity:00000000,00000000,00000000,00000001
      vec:58 type=IO-APIC-edge    status=00000010 in-flight=0
      domain-list=0:  8(----), 
      (XEN)    IRQ:   9 affinity:00000000,00000000,00000000,00000001
      vec:60 type=IO-APIC-edge    status=00000010 in-flight=0
      domain-list=0:  9(----), 
      (XEN)    IRQ:  10 affinity:00000000,00000000,00000000,00000001
      vec:68 type=IO-APIC-level   status=00000010 in-flight=0
      domain-list=0: 10(----), 
      (XEN)    IRQ:  11 affinity:00000000,00000000,00000000,00000001
      vec:70 type=IO-APIC-level   status=00000010 in-flight=0
      domain-list=0: 11(----), 
      (XEN)    IRQ:  12 affinity:00000000,00000000,00000000,00000001
      vec:78 type=IO-APIC-edge    status=00000014 in-flight=0
      domain-list=0: 12(----), 
      (XEN)    IRQ:  13 affinity:00000000,00000000,00000000,000000ff
      vec:88 type=IO-APIC-edge    status=00000002 mapped, unbound 
      (XEN)    IRQ:  14 affinity:00000000,00000000,00000000,00000001
      vec:90 type=IO-APIC-edge    status=00000002 mapped, unbound 
      (XEN)    IRQ:  15 affinity:00000000,00000000,00000000,00000001
      vec:98 type=IO-APIC-edge    status=00000002 mapped, unbound 
      (XEN)    IRQ:  32 affinity:00000000,00000000,00000000,000000ff
      vec:a0 type=IO-APIC-level   status=00000002 mapped, unbound 
      (XEN)    IRQ:  33 affinity:00000000,00000000,00000000,000000ff
      vec:a8 type=IO-APIC-level   status=00000002 mapped, unbound 
      (XEN)    IRQ:  35 affinity:00000000,00000000,00000000,00000001
      vec:b8 type=IO-APIC-level   status=00000002 mapped, unbound 
      (XEN)    IRQ:  36 affinity:00000000,00000000,00000000,000000ff
      vec:c0 type=IO-APIC-level   status=00000002 mapped, unbound 
      (XEN)    IRQ:  37 affinity:00000000,00000000,00000000,00000001
      vec:b0 type=IO-APIC-level   status=00000010 in-flight=0
      domain-list=0: 37(----), 
      (XEN)    IRQ:  39 affinity:00000000,00000000,00000000,000000ff
      vec:51 type=IO-APIC-level   status=00000002 mapped, unbound 
      (XEN)    IRQ:  79 affinity:00000000,00000000,00000000,00000001
      vec:c8 type=PCI-MSI         status=00000010 in-flight=0
      domain-list=0:334(----), 
      (XEN)    IRQ:  80 affinity:00000000,00000000,00000000,00000001
      vec:d0 type=PCI-MSI         status=00000010 in-flight=0
      domain-list=0:333(----), 
      (XEN)    IRQ:  81 affinity:00000000,00000000,00000000,00000001
      vec:d8 type=PCI-MSI         status=00000010 in-flight=0
      domain-list=0:332(----), 
      (XEN)    IRQ:  82 affinity:00000000,00000000,00000000,00000001
      vec:21 type=PCI-MSI         status=00000010 in-flight=0
      domain-list=0:331(----), 
      (XEN)    IRQ:  83 affinity:00000000,00000000,00000000,00000001
      vec:29 type=PCI-MSI         status=00000010 in-flight=0
      domain-list=0:330(----), 
      (XEN)    IRQ:  84 affinity:ffffffff,ffffffff,ffffffff,ffffffff
      vec:31 type=PCI-MSI         status=00000002 mapped, unbound 
      (XEN)    IRQ:  85 affinity:ffffffff,ffffffff,ffffffff,ffffffff
      vec:39 type=PCI-MSI         status=00000002 mapped, unbound 
      (XEN)    IRQ:  86 affinity:ffffffff,ffffffff,ffffffff,ffffffff
      vec:41 type=PCI-MSI         status=00000002 mapped, unbound 
      (XEN)    IRQ:  87 affinity:ffffffff,ffffffff,ffffffff,ffffffff
      vec:49 type=PCI-MSI         status=00000002 mapped, unbound 
      (XEN)    IRQ:  88 affinity:00000000,00000000,00000000,00000001
      vec:59 type=PCI-MSI         status=00000010 in-flight=0
      domain-list=0:325(----), 
      (XEN)    IRQ:  89 affinity:00000000,00000000,00000000,00000001
      vec:69 type=PCI-MSI         status=00000010 in-flight=0
      domain-list=0:324(----), 
      (XEN) IO-APIC interrupt information: 
      (XEN)     IRQ  0 Vec240: 
      (XEN)       Apic 0x00, Pin  2: vector=240, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:255 
      (XEN)     IRQ  1 Vec 40: 
      (XEN)       Apic 0x00, Pin  1: vector=40, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:1 
      (XEN)     IRQ  3 Vec 48: 
      (XEN)       Apic 0x00, Pin  3: vector=48, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=1, dest_id:255 
      (XEN)     IRQ  4 Vec 56: 
      (XEN)       Apic 0x00, Pin  4: vector=56, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=1, dest_id:255 
      (XEN)     IRQ  5 Vec 64: 
      (XEN)       Apic 0x00, Pin  5: vector=64, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:1 
      (XEN)     IRQ  6 Vec 72: 
      (XEN)       Apic 0x00, Pin  6: vector=72, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:1 
      (XEN)     IRQ  7 Vec 80: 
      (XEN)       Apic 0x00, Pin  7: vector=80, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:1 
      (XEN)     IRQ  8 Vec 88: 
      (XEN)       Apic 0x00, Pin  8: vector=88, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:1 
      (XEN)     IRQ  9 Vec 96: 
      (XEN)       Apic 0x00, Pin  9: vector=96, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:1 
      (XEN)     IRQ 10 Vec104: 
      (XEN)       Apic 0x00, Pin 10: vector=104, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=1, irr=0,
      trigger=level, mask=0, dest_id:1 
      (XEN)     IRQ 11 Vec112: 
      (XEN)       Apic 0x00, Pin 11: vector=112, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=1, irr=0,
      trigger=level, mask=0, dest_id:1 
      (XEN)     IRQ 12 Vec120: 
      (XEN)       Apic 0x00, Pin 12: vector=120, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:1 
      (XEN)     IRQ 13 Vec136: 
      (XEN)       Apic 0x00, Pin 13: vector=136, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=1, dest_id:255 
      (XEN)     IRQ 14 Vec144: 
      (XEN)       Apic 0x00, Pin 14: vector=144, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:1 
      (XEN)     IRQ 15 Vec152: 
      (XEN)       Apic 0x00, Pin 15: vector=152, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=0, irr=0,
      trigger=edge, mask=0, dest_id:1 
      (XEN)     IRQ 32 Vec160: 
      (XEN)       Apic 0x01, Pin  0: vector=160, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=1, irr=0,
      trigger=level, mask=1, dest_id:255 
      (XEN)     IRQ 33 Vec168: 
      (XEN)       Apic 0x01, Pin  1: vector=168, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=1, irr=0,
      trigger=level, mask=1, dest_id:255 
      (XEN)     IRQ 35 Vec184: 
      (XEN)       Apic 0x01, Pin  3: vector=184, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=1, irr=0,
      trigger=level, mask=1, dest_id:1 
      (XEN)     IRQ 36 Vec192: 
      (XEN)       Apic 0x01, Pin  4: vector=192, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=1, irr=0,
      trigger=level, mask=1, dest_id:255 
      (XEN)     IRQ 37 Vec176: 
      (XEN)       Apic 0x01, Pin  5: vector=176, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=1, irr=0,
      trigger=level, mask=0, dest_id:1 
      (XEN)     IRQ 39 Vec 81: 
      (XEN)       Apic 0x01, Pin  7: vector=81, delivery_mode=1,
      dest_mode=logical, delivery_status=0, polarity=1, irr=0,
      trigger=level, mask=1, dest_id:255 
      (XEN) traps.c:2308:d1 Domain attempted WRMSR 00000000c0010048 from
      00000000:00780000 to 00000000:00780400. 
     
    A bit strange is the difference between the triggers of IRQ 11
    (level in xm dmesg, egde in /proc/interrupts): 
     
    in xm dmesg: 
    (XEN) Guest interrupt information: 
    (XEN)    IRQ:  11 affinity:00000000,00000000,00000000,00000001
      vec:70 type=IO-APIC-level   status=00000010 in-flight=0
      domain-list=0: 11(----), 
     
    an the line in /proc/interrupts 
                CPU0       CPU1       CPU2       CPU3      
      CPU4       CPU5       CPU6       CPU7        
      11:     200093          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge 
      ehci_hcd:usb1, ohci_hcd:usb2, pciback[0000:00:03.0] 
     
     
    while the triggers for IRQ 35 of the working SAS-Controllers look
    like: 
    in xen dmesg 
    (XEN) Guest interrupt information: 
    (XEN)    IRQ:  35 affinity:00000000,00000000,00000000,00000001
      vec:b8 type=IO-APIC-level   status=00000002 mapped, unbound 
     
    in /proc/interrupts: 
                CPU0       CPU1       CPU2       CPU3      
      CPU4       CPU5       CPU6       CPU7     
      35:         66          0          0          0         
      0          0          0          0  xen-pirq-ioapic-level 
     
    The complete output of /proc/interrupts on DomO follows.. 
     
    DomU: 
     
      [ 2663.759919] pcifront pci-0: Installing PCI frontend 
      [ 2663.768458] pcifront pci-0: Creating PCI Frontend Bus 0000:00 
      [ 2663.776434] pci 0000:00:00.0: reg 10 32bit mmio:
      [0xee4ed000-0xee4edfff] 
      [ 2663.776506] pci 0000:00:00.0: reg 14 io port: [0xb000-0xb0ff] 
      [ 2663.780015] pcifront pci-0: claiming resource 0000:00:00.0/0 
      [ 2663.780015] pcifront pci-0: claiming resource 0000:00:00.0/1 
      [ 2663.905701] usbcore: registered new interface driver usbfs 
      [ 2663.909503] usbcore: registered new interface driver hub 
      [ 2663.911769] usbcore: registered new device driver usb 
      [ 2663.920062] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI)
      Driver 
      [ 2663.927460] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI)
      Driver 
      [ 2663.929648] ohci_hcd 0000:00:00.0: enabling device (0000 ->
      0003) 
      [ 2663.931861] ohci_hcd 0000:00:00.0: Xen PCI enabling IRQ: 11 
      [ 2663.933399] xen_allocate_pirq: returning irq 11 for gsi 11 
      [ 2663.933399] ohci_hcd 0000:00:00.0: OHCI Host Controller 
      [ 2663.933399] ohci_hcd 0000:00:00.0: new USB bus registered,
      assigned bus number 1 
      [ 2663.933399] ohci_hcd 0000:00:00.0: irq 11, io mem 0xee4ed000 
      [ 2663.988136] usb usb1: New USB device found, idVendor=1d6b,
      idProduct=0001 
      [ 2663.992012] usb usb1: New USB device strings: Mfr=3, Product=2,
      SerialNumber=1 
      [ 2663.992012] usb usb1: Product: OHCI Host Controller 
      [ 2663.992012] usb usb1: Manufacturer: Linux 2.6.32-5-xen-686
      ohci_hcd 
      [ 2663.992012] usb usb1: SerialNumber: 0000:00:00.0 
      [ 2664.009170] usb usb1: configuration #1 chosen from 1 choice 
      [ 2664.010739] hub 1-0:1.0: USB hub found 
      [ 2664.012304] hub 1-0:1.0: 2 ports detected 
      [ 2664.520092] usb 1-2: new full speed USB device using ohci_hcd
      and address 2 
      [ 2669.524083] ohci_hcd 0000:00:00.0: Unlink after no-IRQ? 
      Controller is probably using the wrong IRQ. 
     
    The interrupts are now as followed: 
     
    Dom0: 
     
                CPU0       CPU1       CPU2       CPU3      
      CPU4       CPU5       CPU6       CPU7        
         1:          2          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  i8042 
         8:          0          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  rtc0 
         9:          0          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  acpi 
        10:         94          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  sata_svw 
        11:     200093          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge 
      ehci_hcd:usb1, ohci_hcd:usb2, pciback[0000:00:03.0] 
        12:          4          0          0          0         
      0          0          0          0  xen-pirq-ioapic-edge  i8042 
        35:         66          0          0          0         
      0          0          0          0  xen-pirq-ioapic-level  
        37:      57333          0          0          0         
      0          0          0          0  xen-pirq-ioapic-level  megasas 
      2236:        392          0          0          0         
      0          0          0          0   xen-dyn-event     pciback 
      2237:        555          0          0          0         
      0          0          0          0   xen-dyn-event     vif1.0 
      2238:        106          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2239:        217          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2240:       2793          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2241:      16658          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2242:       2444          0          0          0         
      0          0          0          0   xen-dyn-event    
      blkif-backend 
      2243:          1          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:qemu-dm 
      2244:     622308          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:qemu-dm 
      2245:        290          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:qemu-dm 
      2246:        652          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:xenstored 
      2247:          0          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:xenstored 
      2248:       1548          0          0          0         
      0          0          0          0   xen-dyn-event    
      evtchn:xenstored 
      2249:      13089          0          0          0         
      0          0          0          0  xen-pirq-msi       peth0 
      2250:     106066          0          0          0         
      0          0          0          0  xen-pirq-msi       eth1 
      2252:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      mce 
      2257:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2258:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2259:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2260:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2261:          0          0          0          0         
      0          0          0          0  xen-pirq-msi       aerdrv 
      2262:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      pcpu 
      2263:       2921          0          0          0         
      0          0          0          0   xen-dyn-event     xenbus 
      2264:          0          0          0          0         
      0          0          0       1390  xen-percpu-ipi      
      callfuncsingle7 
      2265:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug7 
      2266:          0          0          0          0         
      0          0          0         74  xen-percpu-ipi       callfunc7 
      2267:          0          0          0          0         
      0          0          0      22812  xen-percpu-ipi       resched7 
      2268:          0          0          0          0         
      0          0          0      10217  xen-percpu-virq      timer7 
      2269:          0          0          0          0         
      0          0       1445          0  xen-percpu-ipi      
      callfuncsingle6 
      2270:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug6 
      2271:          0          0          0          0         
      0          0         94          0  xen-percpu-ipi       callfunc6 
      2272:          0          0          0          0         
      0          0       6297          0  xen-percpu-ipi       resched6 
      2273:          0          0          0          0         
      0          0      45737          0  xen-percpu-virq      timer6 
      2274:          0          0          0          0          0      
      3544          0          0  xen-percpu-ipi       callfuncsingle5 
      2275:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug5 
      2276:          0          0          0          0         
      0         93          0          0  xen-percpu-ipi       callfunc5 
      2277:          0          0          0          0          0     
      25613          0          0  xen-percpu-ipi       resched5 
      2278:          0          0          0          0          0     
      21708          0          0  xen-percpu-virq      timer5 
      2279:          0          0          0          0      
      4048          0          0          0  xen-percpu-ipi      
      callfuncsingle4 
      2280:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug4 
      2281:          0          0          0          0       
      105          0          0          0  xen-percpu-ipi      
      callfunc4 
      2282:          0          0          0          0     
      26843          0          0          0  xen-percpu-ipi      
      resched4 
      2283:          0          0          0          0     
      22882          0          0          0  xen-percpu-virq     
      timer4 
      2284:          0          0          0       1545         
      0          0          0          0  xen-percpu-ipi      
      callfuncsingle3 
      2285:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug3 
      2286:          0          0          0         92         
      0          0          0          0  xen-percpu-ipi       callfunc3 
      2287:          0          0          0      23187         
      0          0          0          0  xen-percpu-ipi       resched3 
      2288:          0          0          0      14847         
      0          0          0          0  xen-percpu-virq      timer3 
      2289:          0          0       3351          0         
      0          0          0          0  xen-percpu-ipi      
      callfuncsingle2 
      2290:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug2 
      2291:          0          0         97          0         
      0          0          0          0  xen-percpu-ipi       callfunc2 
      2292:          0          0      25053          0         
      0          0          0          0  xen-percpu-ipi       resched2 
      2293:          0          0      29537          0         
      0          0          0          0  xen-percpu-virq      timer2 
      2294:          0       6800          0          0         
      0          0          0          0  xen-percpu-ipi      
      callfuncsingle1 
      2295:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug1 
      2296:          0         83          0          0         
      0          0          0          0  xen-percpu-ipi       callfunc1 
      2297:          0      31821          0          0         
      0          0          0          0  xen-percpu-ipi       resched1 
      2298:          0      30837          0          0         
      0          0          0          0  xen-percpu-virq      timer1 
      2299:        264          0          0          0         
      0          0          0          0  xen-percpu-ipi      
      callfuncsingle0 
      2300:          0          0          0          0         
      0          0          0          0  xen-percpu-virq      debug0 
      2301:         89          0          0          0         
      0          0          0          0  xen-percpu-ipi       callfunc0 
      2302:      32037          0          0          0         
      0          0          0          0  xen-percpu-ipi       resched0 
      2303:     367301          0          0          0         
      0          0          0          0  xen-percpu-virq      timer0 
       NMI:          0          0          0          0         
      0          0          0          0   Non-maskable interrupts 
       LOC:          0          0          0          0         
      0          0          0          0   Local timer interrupts 
       SPU:          0          0          0          0         
      0          0          0          0   Spurious interrupts 
       PMI:          0          0          0          0         
      0          0          0          0   Performance monitoring
      interrupts 
       PND:          0          0          0          0         
      0          0          0          0   Performance pending work 
       RES:      32037      31821      25053      23187      26844     
      25613       6297      22812   Rescheduling interrupts 
       CAL:        353       6883       3448       1637       4153      
      3637       1539       1464   Function call interrupts 
       TLB:          0          0          0          0         
      0          0          0          0   TLB shootdowns 
       TRM:          0          0          0          0         
      0          0          0          0   Thermal event interrupts 
       THR:          0          0          0          0         
      0          0          0          0   Threshold APIC interrupts 
       MCE:          0          0          0          0         
      0          0          0          0   Machine check exceptions 
       MCP:         15         15         15         15        
      15         15         15         15   Machine check polls 
       ERR:          0 
       MIS:          0 
     
     
    DomU: 
     
                CPU0        
        11:          0  xen-pirq-xt-pic    ohci_hcd:usb1 
      1520:          2   xen-dyn-event     pcifront 
      1521:       5345   xen-dyn-event     eth0 
      1522:        132   xen-dyn-event     blkif 
      1523:        525   xen-dyn-event     blkif 
      1524:       5766   xen-dyn-event     blkif 
      1525:      17698   xen-dyn-event     blkif 
      1526:       3013   xen-dyn-event     blkif 
      1527:          0   xen-dyn-event     vkbd 
      1528:         23   xen-dyn-event     hvc_console 
      1529:     609264   xen-dyn-event     vfb 
      1530:       1042   xen-dyn-event     xenbus 
      1531:          0  xen-percpu-ipi       callfuncsingle0 
      1532:          0  xen-percpu-virq      debug0 
      1533:          0  xen-percpu-ipi       callfunc0 
      1534:          0  xen-percpu-ipi       resched0 
      1535:      32229  xen-percpu-virq      timer0 
       NMI:          0   Non-maskable interrupts 
       LOC:          0   Local timer interrupts 
       SPU:          0   Spurious interrupts 
       PMI:          0   Performance monitoring interrupts 
       PND:          0   Performance pending work 
       RES:          0   Rescheduling interrupts 
       CAL:          0   Function call interrupts 
       TLB:          0   TLB shootdowns 
       TRM:          0   Thermal event interrupts 
       THR:          0   Threshold APIC interrupts 
       MCE:          0   Machine check exceptions 
       MCP:          0   Machine check polls 
       ERR:          0 
       MIS:          0 
     
     
    The USB-Controller is visible on DomU: 
     
    DomU: 
    # lspci -vv 
     
    00:00.0 USB Controller: Broadcom BCM5785 [HT1000] USB (rev 01)
      (prog-if 10 [OHCI]) 
          Subsystem: Dell PowerEdge 2970 HT1000 USB Controller 
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
      ParErr- Stepping- SERR- FastB2B- DisINTx- 
          Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
      >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx+ 
          Latency: 64, Cache Line Size: 64 bytes 
          Interrupt: pin A routed to IRQ 11 
          Region 0: Memory at ee4ed000 (32-bit, non-prefetchable)
      [size=4K] 
          Region 1: I/O ports at b000 [size=256] 
          Capabilities: [dc] Power Management version 2 
              Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
      PME(D0-,D1-,D2-,D3hot-,D3cold-) 
              Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- 
              Bridge: PM- B3+ 
          Kernel driver in use: ohci_hcd 
     
    but lsusb stalls and produces messages: 
     
    [ 2880.040113] INFO: task khubd:1651 blocked for more than 120
      seconds. 
      [ 2880.044042] "echo 0 >
      /proc/sys/kernel/hung_task_timeout_secs" disables this message. 
      [ 2880.044042] khubd         D e0c53005     0  1651      2
      0x00000000 
      [ 2880.044042]  de8ba200 00000246 e0c4655d e0c53005 e0c92818
      c145ee20 c145ee20 c145a354 
      [ 2880.044042]  de8ba3bc c2f34e20 00000000 c21f02e8 00000000
      e0c92a2c c21fa400 c233c100 
      [ 2880.044042]  fffffffe de8ba3bc 00090af7 00000000 c233c100
      00000000 df9c7e3c e0c563c4 
      [ 2880.044042] Call Trace: 
      [ 2880.044042]  [<e0c4655d>] ?
      usb_hcd_check_unlink_urb+0x65/0x81 [usbcore] 
      [ 2880.044042]  [<e0c47f23>] ? usb_kill_urb+0x84/0xa0
      [usbcore] 
      [ 2880.044042]  [<c104b65a>] ?
      autoremove_wake_function+0x0/0x2d 
      [ 2880.044042]  [<e0c48f4c>] ? usb_start_wait_urb+0x62/0x92
      [usbcore] 
      [ 2880.044042]  [<e0c48389>] ? usb_init_urb+0x1a/0x26
      [usbcore] 
      [ 2880.044042]  [<e0c49187>] ? usb_control_msg+0xf7/0x111
      [usbcore] 
      [ 2880.044042]  [<c128dac3>] ? printk+0xe/0x13 
      [ 2880.044042]  [<e0c43c46>] ? hub_port_init+0x2cd/0x650
      [usbcore] 
      [ 2880.044042]  [<c1006764>] ? check_events+0x8/0xc 
      [ 2880.044042]  [<e0c45b1e>] ? hub_thread+0x825/0xe77
      [usbcore] 
      [ 2880.044042]  [<c10345f2>] ? try_to_wake_up+0x2a7/0x2b3 
      [ 2880.044042]  [<c104b65a>] ?
      autoremove_wake_function+0x0/0x2d 
      [ 2880.044042]  [<e0c452f9>] ? hub_thread+0x0/0xe77
      [usbcore] 
      [ 2880.044042]  [<c104b428>] ? kthread+0x61/0x66 
      [ 2880.044042]  [<c104b3c7>] ? kthread+0x0/0x66 
      [ 2880.044042]  [<c1009ae7>] ? kernel_thread_helper+0x7/0x10 
      [ 3000.040096] INFO: task khubd:1651 blocked for more than 120
      seconds. 
      [ 3000.044032] "echo 0 >
      /proc/sys/kernel/hung_task_timeout_secs" disables this message. 
      [ 3000.044032] khubd         D e0c53005     0  1651      2
      0x00000000 
      [ 3000.044032]  de8ba200 00000246 e0c4655d e0c53005 e0c92818
      c145ee20 c145ee20 c145a354 
      [ 3000.044032]  de8ba3bc c2f34e20 00000000 c21f02e8 00000000
      e0c92a2c c21fa400 c233c100 
      [ 3000.044032]  fffffffe de8ba3bc 00090af7 00000000 c233c100
      00000000 df9c7e3c e0c563c4 
      [ 3000.044032] Call Trace: 
      [ 3000.044032]  [<e0c4655d>] ?
      usb_hcd_check_unlink_urb+0x65/0x81 [usbcore] 
      [ 3000.044032]  [<e0c47f23>] ? usb_kill_urb+0x84/0xa0
      [usbcore] 
      [ 3000.044032]  [<c104b65a>] ?
      autoremove_wake_function+0x0/0x2d 
      [ 3000.044032]  [<e0c48f4c>] ? usb_start_wait_urb+0x62/0x92
      [usbcore] 
      [ 3000.044032]  [<e0c48389>] ? usb_init_urb+0x1a/0x26
      [usbcore] 
      [ 3000.044032]  [<e0c49187>] ? usb_control_msg+0xf7/0x111
      [usbcore] 
      [ 3000.044032]  [<c128dac3>] ? printk+0xe/0x13 
      [ 3000.044032]  [<e0c43c46>] ? hub_port_init+0x2cd/0x650
      [usbcore] 
      [ 3000.044032]  [<c1006764>] ? check_events+0x8/0xc 
      [ 3000.044032]  [<e0c45b1e>] ? hub_thread+0x825/0xe77
      [usbcore] 
      [ 3000.044032]  [<c10345f2>] ? try_to_wake_up+0x2a7/0x2b3 
      [ 3000.044032]  [<c104b65a>] ?
      autoremove_wake_function+0x0/0x2d 
      [ 3000.044032]  [<e0c452f9>] ? hub_thread+0x0/0xe77
      [usbcore] 
      [ 3000.044032]  [<c104b428>] ? kthread+0x61/0x66 
      [ 3000.044032]  [<c104b3c7>] ? kthread+0x0/0x66 
      [ 3000.044032]  [<c1009ae7>] ? kernel_thread_helper+0x7/0x10 
      [ 3120.040097] INFO: task khubd:1651 blocked for more than 120
      seconds. 
      [ 3120.043975] "echo 0 >
      /proc/sys/kernel/hung_task_timeout_secs" disables this message. 
      [ 3120.044033] khubd         D e0c53005     0  1651      2
      0x00000000 
      [ 3120.044033]  de8ba200 00000246 e0c4655d e0c53005 e0c92818
      c145ee20 c145ee20 c145a354 
      [ 3120.044033]  de8ba3bc c2f34e20 00000000 c21f02e8 00000000
      e0c92a2c c21fa400 c233c100 
      [ 3120.044033]  fffffffe de8ba3bc 00090af7 00000000 c233c100
      00000000 df9c7e3c e0c563c4 
      [ 3120.044033] Call Trace: 
      [ 3120.044033]  [<e0c4655d>] ?
      usb_hcd_check_unlink_urb+0x65/0x81 [usbcore] 
      [ 3120.044033]  [<e0c47f23>] ? usb_kill_urb+0x84/0xa0
      [usbcore] 
      [ 3120.044033]  [<c104b65a>] ?
      autoremove_wake_function+0x0/0x2d 
      [ 3120.044033]  [<e0c48f4c>] ? usb_start_wait_urb+0x62/0x92
      [usbcore] 
      [ 3120.044033]  [<e0c48389>] ? usb_init_urb+0x1a/0x26
      [usbcore] 
      [ 3120.044033]  [<e0c49187>] ? usb_control_msg+0xf7/0x111
      [usbcore] 
      [ 3120.044033]  [<c128dac3>] ? printk+0xe/0x13 
      [ 3120.044033]  [<e0c43c46>] ? hub_port_init+0x2cd/0x650
      [usbcore] 
      [ 3120.044033]  [<c1006764>] ? check_events+0x8/0xc 
      [ 3120.044033]  [<e0c45b1e>] ? hub_thread+0x825/0xe77
      [usbcore] 
      [ 3120.044033]  [<c10345f2>] ? try_to_wake_up+0x2a7/0x2b3 
      [ 3120.044033]  [<c104b65a>] ?
      autoremove_wake_function+0x0/0x2d 
      [ 3120.044033]  [<e0c452f9>] ? hub_thread+0x0/0xe77
      [usbcore] 
      [ 3120.044033]  [<c104b428>] ? kthread+0x61/0x66 
      [ 3120.044033]  [<c104b3c7>] ? kthread+0x0/0x66 
      [ 3120.044033]  [<c1009ae7>] ? kernel_thread_helper+0x7/0x10 
      [ 3240.040101] INFO: task khubd:1651 blocked for more than 120
      seconds. 
      [ 3240.043989] "echo 0 >
      /proc/sys/kernel/hung_task_timeout_secs" disables this message. 
      [ 3240.044035] khubd         D e0c53005     0  1651      2
      0x00000000 
      [ 3240.044035]  de8ba200 00000246 e0c4655d e0c53005 e0c92818
      c145ee20 c145ee20 c145a354 
      [ 3240.044035]  de8ba3bc c2f34e20 00000000 c21f02e8 00000000
      e0c92a2c c21fa400 c233c100 
      [ 3240.044035]  fffffffe de8ba3bc 00090af7 00000000 c233c100
      00000000 df9c7e3c e0c563c4 
      [ 3240.044035] Call Trace: 
      [ 3240.044035]  [<e0c4655d>] ?
      usb_hcd_check_unlink_urb+0x65/0x81 [usbcore] 
      [ 3240.044035]  [<e0c47f23>] ? usb_kill_urb+0x84/0xa0
      [usbcore] 
      [ 3240.044035]  [<c104b65a>] ?
      autoremove_wake_function+0x0/0x2d 
      [ 3240.044035]  [<e0c48f4c>] ? usb_start_wait_urb+0x62/0x92
      [usbcore] 
      [ 3240.044035]  [<e0c48389>] ? usb_init_urb+0x1a/0x26
      [usbcore] 
      [ 3240.044035]  [<e0c49187>] ? usb_control_msg+0xf7/0x111
      [usbcore] 
      [ 3240.044035]  [<c128dac3>] ? printk+0xe/0x13 
      [ 3240.044035]  [<e0c43c46>] ? hub_port_init+0x2cd/0x650
      [usbcore] 
      [ 3240.044035]  [<c1006764>] ? check_events+0x8/0xc 
      [ 3240.044035]  [<e0c45b1e>] ? hub_thread+0x825/0xe77
      [usbcore] 
      [ 3240.044035]  [<c10345f2>] ? try_to_wake_up+0x2a7/0x2b3 
      [ 3240.044035]  [<c104b65a>] ?
      autoremove_wake_function+0x0/0x2d 
      [ 3240.044035]  [<e0c452f9>] ? hub_thread+0x0/0xe77
      [usbcore] 
      [ 3240.044035]  [<c104b428>] ? kthread+0x61/0x66 
      [ 3240.044035]  [<c104b3c7>] ? kthread+0x0/0x66 
      [ 3240.044035]  [<c1009ae7>] ? kernel_thread_helper+0x7/0x10 
      [ 3360.040100] INFO: task khubd:1651 blocked for more than 120
      seconds. 
      [ 3360.043981] "echo 0 >
      /proc/sys/kernel/hung_task_timeout_secs" disables this message. 
    ... 
     
    After attaching the SAS-Controller, the domU's dmesg looks as
    followed: 
     
    [   92.562729] pcifront pci-0: Installing PCI frontend 
      [   92.571091] pcifront pci-0: Creating PCI Frontend Bus 0000:00 
      [   92.579904] pci 0000:00:00.0: reg 10 io port: [0xcc00-0xccff] 
      [   92.580028] pci 0000:00:00.0: reg 14 64bit mmio:
      [0xee3ec000-0xee3effff] 
      [   92.580149] pci 0000:00:00.0: reg 1c 64bit mmio:
      [0xee3f0000-0xee3fffff] 
      [   92.580268] pci 0000:00:00.0: reg 30 32bit mmio pref:
      [0xee000000-0xee1fffff] 
      [   92.580568] pci 0000:00:00.0: supports D1 D2 
      [   92.582496] pcifront pci-0: claiming resource 0000:00:00.0/0 
      [   92.582496] pcifront pci-0: claiming resource 0000:00:00.0/1 
      [   92.582496] pcifront pci-0: claiming resource 0000:00:00.0/3 
      [   92.582496] pcifront pci-0: claiming resource 0000:00:00.0/6 
      [   92.711562] SCSI subsystem initialized 
      [   92.761565] Fusion MPT base driver 3.04.12 
      [   92.764008] Copyright (c) 1999-2008 LSI Corporation 
      [   92.788484] Fusion MPT SAS Host driver 3.04.12 
      [   92.790749] mptsas 0000:00:00.0: enabling device (0000 ->
      0002) 
      [   92.792004] mptsas 0000:00:00.0: Xen PCI enabling IRQ: 35 
      [   92.795412] mptbase: ioc0: Initiating bringup 
     
    DomU's /proc/interrupts: 
     
                 CPU0        
        11:          0  xen-pirq-xt-pic    ohci_hcd:usb1 
        35:         66  xen-pirq-pcifront  ioc0 
      1520:          1   xen-dyn-event     pcifront 
      1521:        552   xen-dyn-event     eth0 
      1522:        122   xen-dyn-event     blkif 
      1523:        457   xen-dyn-event     blkif 
      1524:       1235   xen-dyn-event     blkif 
      1525:       1345   xen-dyn-event     blkif 
      1526:       1104   xen-dyn-event     blkif 
      1527:          0   xen-dyn-event     vkbd 
      1528:         28   xen-dyn-event     hvc_console 
      1529:     612765   xen-dyn-event     vfb 
      1530:       1155   xen-dyn-event     xenbus 
      1531:          0  xen-percpu-ipi       callfuncsingle0 
      1532:          0  xen-percpu-virq      debug0 
      1533:          0  xen-percpu-ipi       callfunc0 
      1534:          0  xen-percpu-ipi       resched0 
      1535:       8548  xen-percpu-virq      timer0 
       NMI:          0   Non-maskable interrupts 
       LOC:          0   Local timer interrupts 
       SPU:          0   Spurious interrupts 
       PMI:          0   Performance monitoring interrupts 
       PND:          0   Performance pending work 
       RES:          0   Rescheduling interrupts 
       CAL:          0   Function call interrupts 
       TLB:          0   TLB shootdowns 
       TRM:          0   Thermal event interrupts 
       THR:          0   Threshold APIC interrupts 
       MCE:          0   Machine check exceptions 
       MCP:          0   Machine check polls 
       ERR:          0 
       MIS:          0 
     
     
    There is also a difference between the kinds of interrups between
    IRQ 11 and IRQ 35. 
     
    Does someone have an idea how to fix this? 
     
    Kind regards, 
    Michael 
     
     
  
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