Just some basics about KVM

Update: you can fine more info here https://gdoc.pub/doc/e/2PACX-1vSsskD0A2XgHoZhaYLAkS7lmCOrfxkGXk1WTovWEAyeoELVdBjrE-NzD8h-NvJfKhxMpUg2aXzaD-XG.

Resources

• Intel Virtualisation: How VT-x, KVM and QEMU Work Together

Hacking Notes

If you are hacking some low-level stuff that is running as a VM, pay close attention if KVM is involved. I started this note because I spent sometime twisting page_fault IDT entry, but it turns out KVM uses async_page_fault. Oh, well.

• KVM page fault entry (arch/x86/entry/entry_64.S)
  • It is idtentry async_page_fault do_async_page_fault has_error_code=1
  • ..not idtentry page_fault do_page_fault has_error_code=1

More on Virturlization

Well. I swear I want to learn more about Virturlization..

• Intel SDM, volume 3, Chapter 23 - Chapter 33.

–
Yizhou Shan
Created: May 20, 2019
Last Updated: Sep 11, 2019