Hi,

I am trying to use Vt-d to pass through an Intel 82574 NIC which is connected to the PCH. I am using qemu-kvm 12.5, Linux 2.6.29 and Intel Xeon3400 series CPU.

- I have verified Vt-d is enabled in BIOS.

- I have enabled the following in the linux config:

CONFIG_DMAR=y
CONFIG_DMAR_DEFAULT_ON=y
CONFIG_INTR_REMAP=y
CONFIG_PCI_STUB=y

- I have added intel_iommu=1 to the kernel command line

- I see the following during boot:

[ 3.150016] DMAR:Host address width 36
[ 3.160001] DMAR:DRHD (flags: 0x00000001)base: 0x00000000fed90000
[ 3.170006] DMAR:RMRR base: 0x00000000df5c1000 end: 0x00000000df5cefff
[ 3.180051] IOMMU 0xfed90000: using Queued invalidation
[ 3.190001] IOMMU: Setting identity map for device 0000:00:1d.0 [0xdf5c1000 - 0xdf5cf000]
[ 3.200032] IOMMU: Setting identity map for device 0000:00:1a.0 [0xdf5c1000 - 0xdf5cf000]
[ 3.210040] IOMMU: gfx device 0000:14:00.0 1-1 mapping
[ 3.220001] IOMMU: Setting identity map for device 0000:14:00.0 [0x0 - 0x9c000]
[ 3.230060] IOMMU: Setting identity map for device 0000:14:00.0 [0x100000 - 0xdf458000]
[ 3.453208] IOMMU: Setting identity map for device 0000:14:00.0 [0xdf620000 - 0xdf621000]
[ 3.460007] IOMMU: Setting identity map for device 0000:14:00.0 [0xdf694000 - 0xdf800000]
[ 3.470142] IOMMU: Setting identity map for device 0000:14:00.0 [0x100000000 - 0x420000000]
[ 4.218950] IOMMU: Prepare 0-16M unity mapping for LPC
[ 4.220001] IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 - 0x1000000]
[ 4.240898] PCI-DMA: Intel(R) Virtualization Technology for Directed I/O

- I use the pci-stub driver (e1000e is not in the host kernel so I don't need to unbind)

echo "8086 10d3" > /sys/bus/pci/drivers/pci-stub/new_id
echo 0000:12:00.0 > /sys/bus/pci/drivers/pci-stub/bind

I added "-pcidevice host=12:00.0" to qemu but I see no errors and I don't see the device in lspci on the geust.

Any ideas?