tandasat/simplesvm

A minimalistic educational hypervisor for Windows on AMD processors.

SimpleSvm

Introduction

SimpleSvm is a minimalistic educational hypervisor for Windows on AMD processors. It aims to provide small and explanational code to use Secure Virtual Machine (SVM), the AMD version of Intel VT-x, with Nested Page Tables (NPT) from a windows driver.

SimpleSvm is inspired by SimpleVisor, an Intel x64/EM64T VT-x specific hypervisor for Windows, written by Alex Ionescu (@aionescu).

Supported Platforms

• Windows 10 x64 and Windows 7 x64
• AMD Processors with SVM and NPT support

Resources

• AMD64 Architecture Programmer’s Manual Volume 2 and 3

  • http://developer.amd.com/resources/developer-guides-manuals/

• SimpleVisor

  • http://ionescu007.github.io/SimpleVisor/

• HelloAmdHvPkg

  • https://github.com/tandasat/HelloAmdHvPkg

simplesvm's Issues

system hangs shortly after virtualizing processors

Hello, thank you for this simple repository, it is really helping me learn all about virtualization on AMD processors. I downloaded your hypervisor, and recoded many parts to gain a better understanding on how things work. Right now, I am having an issue where the entire system hangs a few seconds after vmrun. I found out that it always hangs at PAUSE instruction after sending an IPI request (KiIpiSendRequest) in an ntoskrnl function. I have attached two images below, showing exactly where it hangs inside ntoskrnl.

What could possibly be the reason behind this?

Thanks in advance.