vfio-pci: dvb-s2 pcie card stopped working after a short time

[Wolfgang Nothdurft <wolfgang@linux-dude.de>]

Hi,

I'm using kvm + libvirt + pci pass-through (vfio-pci) for virtualizing 
my mythtv server.

     <hostdev mode='subsystem' type='pci' managed='yes'>
       <driver name='vfio'/>
       <source>
         <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
       </source>
       <address type='pci' domain='0x0000' bus='0x02' slot='0x03' 
function='0x0'/>
     </hostdev>


I had no problems with my previous dvb cards at least no big known problems.

With my new dvb-s2 card (DVBSky S952 V3), the card stopped working after 
recording 1 or 2 hour.

After than the dvbstream from the card is broken and I have to reload 
the driver.

MythTV Log shows:

Apr  7 19:19:10 mythtv mythlogserver: mythbackend[2087]: E DVBRead 
recorders/dtvrecorder.cpp:855 (FindH264Keyframes) DTVRec[1]: PES start 
code not found in TS packet with PUSI set
Apr  7 19:19:12 mythtv mythlogserver: mythbackend[2087]: E DVBRead 
mpeg/mpegstreamdata.cpp:364 (AssemblePSIP) 
MPEGStream[1](0x7f9bd412b898): Error: offset>181, pes length & current 
cannot be queried

On the kvm host the card works properly. With my old cards I got these 
problems sporadically, so this was not a big deal for me.
But now it is unusable.

/proc/interrupts and lspci -vv from the kvmhost:

  29:    1061275    1065204    1060158    1066001   PCI-MSI-edge 
SMI_PCIE

01:00.0 Multimedia video controller: Spin Master Ltd. Device 3038 (rev 01)
         Subsystem: DVBSky Device 0552
         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: 32 bytes
         Interrupt: pin A routed to IRQ 29
         Region 0: Memory at d0100000 (32-bit, non-prefetchable) [size=4K]
         Capabilities: [40] Power Management version 3
                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
         Capabilities: [50] MSI: Enable+ Count=1/16 Maskable- 64bit+
                 Address: 00000000fee0f00c  Data: 4127
         Capabilities: [70] Express (v1) Endpoint, MSI 00
                 DevCap: MaxPayload 256 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 128 bytes, MaxReadReq 512 bytes
                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- 
AuxPwr- TransPend-
                 LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s, 
Latency L0 unlimited, L1 unlimited
                         ClockPM- Surprise- LLActRep- BwNot-
                 LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- 
CommClk+
                         ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                 LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ 
DLActive- BWMgmt- ABWMgmt-
         Kernel driver in use: SMI PCIe driver
         Kernel modules: smipcie


/proc/interrupts from kvmhost when the vm is started:

  29:          0          0          0          0   PCI-MSI-edge 
vfio-msi[0](0000:01:00.0)

/proc/interrupts and lspci -vv from the vm

  25:          0          0   PCI-MSI-edge      SMI_PCIE


02:03.0 Multimedia video controller: Spin Master Ltd. Device 3038 (rev 01)
         Subsystem: DVBSky Device 0552
         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: 32 bytes
         Interrupt: pin A routed to IRQ 25
         Region 0: Memory at fe660000 (32-bit, non-prefetchable) [size=4K]
         Capabilities: [40] Power Management version 3
                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
         Capabilities: [50] MSI: Enable+ Count=1/16 Maskable- 64bit+
                 Address: 00000000fee0300c  Data: 41a1
         Capabilities: [70] Express (v1) Endpoint, MSI 00
                 DevCap: MaxPayload 256 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 128 bytes, MaxReadReq 512 bytes
                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- 
AuxPwr- TransPend-
                 LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s, 
Latency L0 unlimited, L1 unlimited
                         ClockPM- Surprise- LLActRep- BwNot-
                 LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- 
CommClk+
                         ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                 LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ 
DLActive- BWMgmt- ABWMgmt-
         Kernel driver in use: SMI PCIe driver
         Kernel modules: smipcie

I have tried several things, all with the same result.

* Swapping PCIe Port
* using kvm-based-passthrough instead of vfio-pci
* starting qemu direct and using bus=pcie.0 ( -device 
vfio-pci,host=01:00.0,id=hostdev0,bus=pcie.0,addr=0x3)


Board: Supermicro C2SBC-Q
dvb-s2: DVBSky S952 V3
System: Gentoo
Kernel: 3.19.0-gentoo (on both host and vm)
qemu: 2.1.2
libvirt: 1.2.10

Is there anything I can do to find and solve this problem?
Or is this simply a bad combination of hardware components and I will 
stuck here?

Thanks
Wolfgang