CMPE 283 Assignment 3

Perfromed the step to generate the rsa key-pair

Question 1:

Successfully generated the kernel and installed crucial kernel modules within the VM. Conducted thorough research on CPUID instructions and CPU leaf nodes, pinpointing specific modifications needed for assignment completion. Implemented the necessary changes in the cpuid.c and vmx.c files to align with project requirements. Updated the README.md with comprehensive details and crafted documentation for future reference.

Achieved the creation of the kernel and proceeded to install vital kernel modules within the VM. Developed a solid understanding of the assignment's code, followed by the installation of the nested VM and comprehensive testing through CPUID.

The output is in this repository

Question 2: (Steps used to complete the assignment)

Run this code in the VM

git clone https://github.com/manikantanynala97/linux.git

Get the correct Linux version

ls /boot/

Copy the config file to root directory

cp /boot/config-5.11.0-1029-gcp .config

sudo apt install make

make oldconfig

Install all the required libraries

sudo apt install gcc
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install bison
sudo apt-get install qemu-kvm qemu virt-manager virt-viewer libvirt-daemon

Make the modules parallely using 8 cores in our machine Update the cpuid.c and vmx.c files and make the modules

cd arch
cd x86
cd kvm
vi cpuid.c
vi vmx/vmx.c
cd ..
make modules
sudo make -j 8 modules
sudo make install

Create a user-data file and save the nested VM login config

#cloud-config
chpasswd: { expire: False }
ssh_pwauth: True

Download and Install the nested VM

wget https://cloud-images.ubuntu.com/bionic/current/bionic-server-cloudimg-amd64.img
sudo virt-customize -a bionic-server-cloudimg-amd64.img --root-password password:newpass
sudo virt-customize -a bionic-server-cloudimg-amd64.img --uninstall cloud-init
cloud-localds user-data.img user-data
sudo qemu-system-x86_64 -enable-kvm -hda bionic-server-cloudimg-amd64.img -drive "file=user-data.img,format=raw" -m 512 -curses -nographic

username: root

password: newpass

Inside the Nested VM Install cpuid to test

sudo apt-get update
sudo apt-get install cpuid

Test using CPUID

cpuid -l 0x4FFFFFFD
cpuid -l 0x4FFFFFFC

Question 3:

Comment on the frequency of exits – does the number of exits increase at a stable rate? Or are there more exits performed during certain VM operations? Approximately how many exits does a full VM boot entail?

The number of exits increases at a stable rates as these exits are called fairly regularly

Question 4:

Of the exit types defined in the SDM, which are the most frequent? Least ?

Most frequent exit is Exit #30 - IO_INSTRUCTION

Least frequest exit is Exit #0 - EXCEPTION_NMI