bitsvisor

Kernel Module that enables Linux to act as a VMM. Leverges x86's VT-x to support virtualization. The motivation behind the project is to learn about virtualization and how hypervisors work by building a minimal hypervisor. The code in the project is inspired from KVM and an online tutorial. Learning experience from the project till now:

• Inline assembly (importance of extended assembly, which resulted in a stackoverflow question)
• How to access registers (such as CR4) using inline assembly.
• VT-x instructions, MSRs and how to access them.
• How to allocate kernel memory and importance of __pa() (virtual to physical address translation in kernel)

Features

Not much yet. Can enter VMX mode and return from it as of now.

TODO

• Using vmread and vmwrite, set different control fields in VMCS for:

  -> VM-entry

  -> VM-execution

  -> VM-exit

• Initialize guest and the host state area in VCMS:

  -> define functions for accessing CR3 and CR4 registers.

  -> set various segment registers values.