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Posts published in “CPU”

Hypervisor From Scratch – Part 6: Virtualizing An Already Running System

Sina Karvandi 10

Introduction Hello and welcome to the 6th part of the tutorial Hypervisor From Scratch. In this part, I try to give you an idea of how to virtualize an already running system using Hypervisor. Like other parts, this part is really dependent to the previous parts so make sure to read them first. Overview In the 6th part, we’ll see how we can virtualize our currently running system by configuring VMCS, then we use monitoring features to detect execution of…

Call Gates’ Ring Transitioning in IA-32 Mode

Sina Karvandi 0

Have you ever thought how transitions between different rings performed? Well, SYSENTER & SYSCALL used in modern OSs for transitioning between ring 3 to ring 0 but if there are other rings, then what’s Intel solution for entering them? The answer is call gates. The rest of this topic described how to use call gates in modern processors. 80386 and its successors have 4 levels protections which isolate and protect user programs from each other and the operating system. It…

Hypervisor From Scratch – Part 5: Setting up VMCS & Running Guest Code

Sina Karvandi 10

Introduction Hello and welcome back to the fifth part of the “Hypervisor From Scratch” tutorial series. Today we will be configuring our previously allocated Virtual Machine Control Structure (VMCS) and in the last, we execute VMLAUNCH and enter to our hardware-virtualized world! Before reading the rest of this part, you have to read the previous parts as they are really dependent. The full source code of this tutorial is available on GitHub : [https://github.com/SinaKarvandi/Hypervisor-From-Scratch] Most of this topic derived from…

Hypervisor From Scratch – Part 4: Address Translation Using Extended Page Table (EPT)

Sina Karvandi 0

Hello guys! Welcome to the fourth part of the “Hypervisor From Scratch”. This part is primarily about translating guest address through Extended Page Table (EPT) and its implementation. We also see how shadow tables work and other cool stuff. First of all, make sure to read the earlier parts before reading this topic as these parts are really dependent on each other also you should have a basic understanding of paging mechanism and how page tables work. A good article is…

Hypervisor From Scratch – Part 3: Setting up Our First Virtual Machine

Sina Karvandi 1

Introduction This is the third part of the tutorial “Hypervisor From Scratch“. You may have noticed that the previous parts have steadily been getting more complicated. This part should teach you how to get started with creating your own VMM, we go to demonstrate how to interact with the VMM from Windows User-mode (IOCTL Dispatcher), then we solve the problems with the affinity and running code in a special core. Finally, we get familiar with initializing VMXON Regions and VMCS…