From: Jason Wang <jasowang@redhat.com>
Date: Fri, 24 May 2019 04:12:12 -0400

This series tries to access virtqueue metadata through kernel virtual
address instead of copy_user() friends since they had too much
overheads like checks, spec barriers or even hardware feature
toggling like SMAP. This is done through setup kernel address through
direct mapping and co-opreate VM management with MMU notifiers.

Test shows about 23% improvement on TX PPS. TCP_STREAM doesn't see
obvious improvement.

I'm still waiting for some review from mst.

If I don't see any review soon I will just wipe these changes from
patchwork as it serves no purpose to just let them rot there.

Thank you.