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- > SERR- 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 [disabled] > Capabilities: > 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 >