Improve AIX Support

[Dylan-M]

Implement additional AIX support

I have very little Golang experience.
So... please point out anything I'm doing wrong from Golang perspective
Also anything I can do to improve efficiency of some of the things I had to do as loops to pick something out of several lines.
Or really, anything else. I don't take offense, unless you're rude about it. Constructive criticism is always welcome.

This should now support all packages except process, which I don't have the time to develop (process is very in-depth)

Added:

• CPU Package: Support for percpu
• CPU Package: Support additional fields
• Host Package: Add AIX support
• Disk Package: Add support for nocgo

Partially addresses #1490

[Dylan-M]

@shirou If you're at all concerned about AIX support, I'm willing to be a code owner for the AIX portions only to help alleviate that. Alternatively, I can help you get set up with an emulated AIX system to work from.

[shirou]

Thank you for your contribution! I haven't actually run it, but it looks fine at first glance, with some nit comments. If there are any issues on AIX, someone will likely open an issue for it. This is how we've handled other architectures in the past.

Unrelated to this PR, but for my future reference, could you let me know the best way to set up an AIX emulation environment? Would QEMU be a good option?

[shirou]

Do those required need to be added to the go.mod file?

[Dylan-M]

You'll likely know better than I do. I simply rand go mod tidy and went with what go itself says.

[Dylan-M]

I tried removing them, and running go mod tidy again. It readded them. So golang thinks they need to be there.

[shirou]

I know the 1.15 is too old, but should it be updated in this PR?

[Dylan-M]

It is required for the code in this PR to actually function, so in my opinion yes. I will however defer it to another PR if you think that best.

[Dylan-M]

Unrelated to this PR, but for my future reference, could you let me know the best way to set up an AIX emulation environment? Would QEMU be a good option?

Yes, but not using libvirt (virsh or the gui virt-manager). I scoured the internet, and played around a lot, to get this to work. It is a combination of other peoples' work, and my own knowledge. I only have it working for AIX 7.2 at this time, still working on 7.3.

# AIX 7.2 PowerPC "POWER9"
sudo qemu-system-ppc64 -M pseries,ic-mode=xics -cpu POWER9 \
  -smp 4,sockets=4,cores=2,threads=2,maxcpus=16 \
  -m 4096 \
  -name aix_7200-04-02-2027 \
  -netdev bridge,id=net0,br=virbr0 \
  -device spapr-vlan,netdev=net0,mac=52:54:00:49:53:14 \
  -device virtio-scsi,id=scsi0 \
  -drive file=/var/lib/libvirt/images/aix7.2-ppc64.qcow2,if=none,id=drive-scsi0-0-0-0,format=qcow2,cache=none \
  -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=1 \
  -drive file=/path/to/iso/aix/7.2/aix_7200-04-02-2027_1of2_072020.iso,format=raw,media=cdrom,cache=unsafe

You can edit the cpu line, I've had it working with just smp 1 and memory of -m 2048.

EDIT: This was the command I used to create my disk image:
sudo qemu-img create -f qcow2 /var/lib/libvirt/images/aix7.2-ppc64.qcow2 50G

Would you also be interested in my little test/sample program that I used to actually test this manually? I can dump it into a gist.

[Dylan-M]

Here is the test program gist

https://gist.github.com/Dylan-M/3dd22484c7fa30e6826ede5566e291eb

[shirou]

Thank you for your great contribution! Unfortunately, I haven't had the time to test this PR with QEMU, but it seems unlikely there will be any issues. If there are any problems, someone will probably create an issue. Additionally, gopsutil depends on sys/unix, which specifies Go 1.18, so it seems necessary to update to Go 1.18.