* [dpdk-users] Mellanox mlx5 PMD: is IOMMU used?
@ 2018-02-08 3:03 Andrew Theurer
2018-02-08 6:22 ` Shahaf Shuler
0 siblings, 1 reply; 2+ messages in thread
From: Andrew Theurer @ 2018-02-08 3:03 UTC (permalink / raw)
To: users
My understanding is that the vfio-pci kernel module cannot be loaded for
Mellanox adapters, and the mlx5_core must stay loaded in the kernel. Does
that mean there is no IOMMU used?
Thanks,
-Andrew
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [dpdk-users] Mellanox mlx5 PMD: is IOMMU used?
2018-02-08 3:03 [dpdk-users] Mellanox mlx5 PMD: is IOMMU used? Andrew Theurer
@ 2018-02-08 6:22 ` Shahaf Shuler
0 siblings, 0 replies; 2+ messages in thread
From: Shahaf Shuler @ 2018-02-08 6:22 UTC (permalink / raw)
To: Andrew Theurer, users
Hi Andrew
Thursday, February 8, 2018 5:03 AM, Andrew Theurer:
> My understanding is that the vfio-pci kernel module cannot be loaded for
> Mellanox adapters, and the mlx5_core must stay loaded in the kernel. Does
> that mean there is no IOMMU used?
Yes, the chip set IOMMU is not being used. it can be used, but this is not a strict requirement to enforce memory protection.
Memory protection and isolation are enforced by the kernel driver and the device.
Mellanox devices has translation engine from VA->PA for registered addresses.
The PMD is working with VA, and registering them to the device through mlx5_core which enforce the protection, pin the memory (If needed) and provide the PA to the device.
>
> Thanks,
>
> -Andrew
^ permalink raw reply [flat|nested] 2+ messages in thread
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