colo
sva/vsva & scalable iov
https://static.sched.com/hosted_files/kvmforum2018/52/kvm-forum-vSVA-yliu-jpan-jean-eric.pdf
https://lists.linuxfoundation.org/pipermail/iommu/2018-May/027595.html
https://www.slidestalk.com/u54/LinuxCon18_Share_Virtual_Address
https://lwn.net/Articles/815745/
https://patchwork.kernel.org/cover/10838859/
io_uring
https://zhuanlan.zhihu.com/p/62682475
https://www.atatech.org/articles/177993