PCI Passthrough "can't reset pci device"

charhunter

New Member
Nov 12, 2012
1
0
1
Hi,

I'm trying to add two PCI DVB-C cards to a VM (TerraTec Cinergy C PCI HD CI).

Code:
08:05.0 Multimedia controller: Twinhan Technology Co. Ltd Mantis DTV PCI Bridge Controller [Ver 1.0] (rev 01)    Subsystem: TERRATEC Electronic GmbH Device 1178
    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: 32 (2000ns min, 63750ns max)
    Interrupt: pin A routed to IRQ 10
    Region 0: Memory at fbfff000 (32-bit, prefetchable) [size=4K]
    Kernel driver in use: pci-stub


08:06.0 Multimedia controller: Twinhan Technology Co. Ltd Mantis DTV PCI Bridge Controller [Ver 1.0] (rev 01)
    Subsystem: TERRATEC Electronic GmbH Device 1178
    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: 32 (2000ns min, 63750ns max)
    Interrupt: pin A routed to IRQ 11
    Region 0: Memory at fbffe000 (32-bit, prefetchable) [size=4K]
    Kernel driver in use: pci-stub

After adding them to the VM

Code:
hostpci0: 08:05.0
hostpci1: 08:06.0

I can't start the VM anymore. The Webfrontend says "TASK ERROR: can't reset pci device '08:05.0'".

Syslog says:

Code:
Nov 12 00:37:16 proxmox pvedaemon[11642]: start VM 101: UPID:proxmox:00002D7A:0020DED8:50A036AC:qmstart:101:root@pam:Nov 12 00:37:16 proxmox pvedaemon[11642]: can't reset pci device '08:05.0'
Nov 12 00:37:16 proxmox pvedaemon[11080]: <root@pam> end task UPID:proxmox:00002D7A:0020DED8:50A036AC:qmstart:101:root@pam: can't reset pci device '08:05.0'

PCI Passthrough is working in another VM with a NIC.

Thanks in advance


My System:
Proxmox 2.2-24
Asrock 890FX Deluxe3
AMD Athlon II 240e
 

ringerl

New Member
Nov 24, 2013
15
0
1
Having the same issue here with a lynx point sata hba in ahci mode. I tried to hotadd the device with

device_add pci-assign,host=01:00.0,id=mydevice

which seemingly worked fine after doing all the unbinding in /sys/bus/pci/*

Is there some problem with the unbinding process in proxmox?
 

ringerl

New Member
Nov 24, 2013
15
0
1
First I just tried to add the device like that:

Code:
qm> device_add pci-assign,host=01:00.0,id=mydevice
PCI region 5 at address 0xf7c10000 has size 0x200, which is not a multiple of 4K.  You might experience some performance hit due to that.
Failed to assign device "mydevice" : Device or resource busy
*** The driver 'ahci' is occupying your device 0000:01:00.0.
***
*** You can try the following commands to free it:
***
*** $ echo "1b21 0612" > /sys/bus/pci/drivers/pci-stub/new_id
*** $ echo "0000:01:00.0" > /sys/bus/pci/drivers/ahci/unbind
*** $ echo "0000:01:00.0" > /sys/bus/pci/drivers/pci-stub/bind
*** $ echo "1b21 0612" > /sys/bus/pci/drivers/pci-stub/remove_id
***
Device 'kvm-pci-assign' could not be initialized
qm>

Ran the unbinding/binding commands as suggested:

Code:
root@proxmox:~# echo "1b21 0612" > /sys/bus/pci/drivers/pci-stub/new_id
root@proxmox:~# echo "0000:01:00.0" > /sys/bus/pci/drivers/ahci/unbind
root@proxmox:~# echo "0000:01:00.0" > /sys/bus/pci/drivers/pci-stub/bind
root@proxmox:~# echo "1b21 0612" > /sys/bus/pci/drivers/pci-stub/remove_id

And tried again and voilà:

Code:
qm> device_add pci-assign,host=01:00.0,id=mydevice
PCI region 5 at address 0xf7c10000 has size 0x200, which is not a multiple of 4K.  You might experience some performance hit due to that.
Host-side INTx sharing not supported, using MSI instead
Some devices do not work properly in this mode.
qm>
 
Last edited:

ringerl

New Member
Nov 24, 2013
15
0
1
Could someone from the dev team look into this issue? Obviously something is wrong with the way this is handled automatically in Proxmox - manually passthrough works just fine.
 

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