> Which kvm/qemu-kvm version?  Newer ones will verify that you actually have 
> VT-d fully enabled.
kvm module version is :kvm-83-105.el5_4.13 (from modinfo)

> Can you do 'dmesg | grep -e DMAR -e IOMMU' in the host and then we can verify 
> that the IOMMU is functioning.
dmesg output:
ACPI: DMAR (v001    AMI  OEMDMAR 0x00000001 MSFT 0x00000097) @ 
0x00000000bf79e0c0
DMAR:Host address width 40
DMAR:DRHD (flags: 0x00000001)base: 0x00000000fbffe000
DMAR:RMRR base: 0x00000000000ec000 end: 0x00000000000effff
DMAR:RMRR base: 0x00000000bf7ec000 end: 0x00000000bf7fffff
DMAR:Unknown DMAR structure type

> You may need to configure VT-d support in your kernel, or manually enable it 
> on the kernel commandline (intel_iommu=on).  Oh...I see,
> RHEL5.4 host, yeah, you need intel_iommu=on.

That did not help.

Thanks,
Yevgeny--
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