[dpdk-dev] DMAR fault
Paul Barrette
paul.barrette at windriver.com
Tue Aug 13 00:22:06 CEST 2013
On 08/12/2013 06:07 PM, jinho hwang wrote:
>
> On Mon, Aug 12, 2013 at 4:28 PM, Paul Barrette
> <paul.barrette at windriver.com <mailto:paul.barrette at windriver.com>> wrote:
>
>
> On 08/12/2013 04:19 PM, jinho hwang wrote:
>> Hi All,
>>
>> I am using iommu to receive packets both from hypervisor and from
>> VM. KVM is used for the virtualization. However, after I deliver
>> the kernel options (iommu and pci realloc), I can not receive
>> packets in hypervisor, but VF works fine in VM. When I tried to
>> receive packets in hypervisor, dmesg shows the following:
>>
>> ixgbe 0000:03:00.1: complete
>> ixgbe 0000:03:00.1: PCI INT A disabled
>> igb_uio 0000:03:00.1: PCI INT A -> GSI 38 (level, low) -> IRQ 38
>> igb_uio 0000:03:00.1: setting latency timer to 64
>> igb_uio 0000:03:00.1: irq 87 for MSI/MSI-X
>> uio device registered with irq 57
>> DRHD: handling fault status reg 2
>> DMAR:[DMA Read] Request device [03:00.1] fault addr *b9d0f000*
>> DMAR:[fault reason 02] Present bit in context entry is clear
>>
>> 03:00.1 Ethernet controller: Intel Corporation 82599EB 10 Gigabit
>> Dual Port Backplane Connection (rev 01)
>> Subsystem: Intel Corporation Ethernet X520 10GbE Dual
>> Port KX4-KR Mezz
>> 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 38
>> Region 0: Memory at *d9400000* (64-bit, prefetchable)
>> [size=4M]
>> Region 2: I/O ports at ece0 [size=32]
>> Region 4: Memory at d9bfc000 (64-bit, prefetchable)
>> [size=16K]
>> Expansion ROM at <ignored> [disabled]
>> Capabilities: <access denied>
>> Kernel driver in use: igb_uio
>> Kernel modules: ixgbe
>>
>> We can see those addresses are not matched. So the kernel got
>> fault. I am wondering why this happens?
> I have seen this happen when VT-d is enabled in the bios. If you
> are using dpdk 1.4, add "iommu=pt" to your boot line. Without it,
> no packets are received.
>
> Pb
>
>>
>> One suspicion for this is BIOS. I am currently using BIOS version
>> 3.0, but the latest is 6.3.0. Does this affect the matter?
>>
>> Any help appreciated!
>>
>> Jinho
>>
>
>
> Paul,
>
> thanks. I tried your suggestion, but it works like no iommu command in
> boot line. I passed intel_iommu=pt, and receive packets from
> hypervisor. However, when I started VM with "-device
> pci-assign,host=01:00.0", it shows the following message:
>
> qemu-system-x86_64: -device pci-assign,host=03:10.0: No IOMMU found.
> Unable to assign device "(null)"
> qemu-system-x86_64: -device pci-assign,host=03:10.0: Device
> initialization failed.
> qemu-system-x86_64: -device pci-assign,host=03:10.0: Device
> 'kvm-pci-assign' could not be initialized
>
> The device is detached from kernel, and move to pci-stub. dmesg does
> not show any DMAR fault message anymore.
>
> Any idea?
>
> Jinho
Jinho,
you need to specify both
" intel_iommu=on iommu=pt"
Pb
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