vt-d posted interrupts support

Rakesh_B_ — Wed, 18 Mar 2015 13:35:33 GMT

Hello,

I have the S2600CP server board with cpu "Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz" which supports for APICv, I had patched the linux kernel source 3.18.0 to support vt-d posted interrupts on direct assigned devices, Given in lkml "http://thread.gmane.org/gmane.linux.kernel.iommu/7708".

I had checked the vt-d specification document[1] that describes "Remapping hardware support for interrupt-posting capability is reported through the Posted Interrupt Support (PI) field in the Capability register (CAP_REG)", In which it returns as the posted interrupt is not supported. The assigning the ixgbe network device is been done via VFIO assignment method.

[1] http://www.intel.com/content/www/us/en/intelligent-systems/intel-technology/vt-directed-io-spec.html

Does the above hardware support vt-d posted interrupt for direct assigned device assignment or it requires any hardware to do this.

Thanks

Rakesh

Hi,

Quoc-Thai_L_Intel — Tue, 21 Apr 2015 04:29:48 GMT

Hi,

The key is to get the correct combination of motherboard, chipset, CPU, and software for Intel(R) VT-d to work. Here is another thread discussing about it that may provide some information for you: https://software.intel.com/en-us/forums/topic/473597?language=es

-Thai

topic vt-d posted interrupts support in Software Archive

vt-d posted interrupts support

Hi,