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Xen Virtual Machine created does not use iommu

3170315Jun 16 2017 — edited Jun 19 2017

Hello,

I have an x86 machine running Oracle VM server release 3.4.3. I have enabled VT-D support in the BIOS and have "intel_iommu=on iommu=pt" in the grub.

I have created a virtual machine using xm running oracle linux 7.3 and have "intel_iommu=on iommu=force" in the VM's grub. I see nothing regarding "DMAR" or "VT-d" in dmesg. Searching for "iommu" in dmesg only shows

[ 0.000000] Intel-IOMMU: enabled

When I look at the function call stack for the ixgbe driver of an interface given to the VM, I see that "nommu_map_page" is called which means that IOMMU does not seem to be up.

Is this happening because of PCI passthrough and 1:1 mapping?

How do I force the VM use the hardware IOMMU.

Thanks,

Aadithya

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Locked on Jul 17 2017

Added on Jun 16 2017

#oracle-virtualization, #oracle-vm-server-for-x86

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