[dpdk-dev] DMAR fault

[jinho hwang]

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?

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
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