** Steps Used To Build And Complete This Assignment **

Prerequisites: Use virtualization enabled machine with at least 160-200 GB space.

Step 1: Get VMware Fusion setup installed.

Step 2: Then install Linux Ubuntu on VMware Fusion. Enable nested virtualization.

Step 3: Then install GitHub on a laptop.

Step 4: Clone the kernel sources from the master Linux git repository: git clone https://github.com/torvalds/linux.git

Step 5: Build the kernel, Install packages necessary to compile the Linux kernel from source:

    sudo bash apt-get install build-essential kernel-package fakeroot libncurses5-dev libssl-dev ccache bison flex libelf-dev

Step 6: Print all the system information in the following order: Kernel name, network node hostname, kernel release date, kernel version, machine hardware name, hardware platform, operating system. This can be done by running the follwo

     uname -a

Step 7: Execute the following commands sequentially one after the other

     cp /boot/config-5.9.0-generic ./.config 
     make oldconfig
     make && make modules && make install && make modules-install 
     Reboot
     uname -a (Verify that you are using the newer kernel after reboot) 

Step 8: Modify the kernel code with the assignment functionality: ◦

Step 9: After modifying the code both in cpuid.c and vmx.c do the following steps again

    make oldconfig
    make && make modules && make install && make modules-install 
    Reboot

Step 9: Now to test this change to CPUID.c create an inner VM.

Step 10: Use the following command to install KVM and supporting packages.

    sudo apt-get install qemu-kvm libvirt-bin bridge-utils virt-manager

Step 11: Verify KVM Installation using the following command. You should see an empty list of virtual machines. This indicates that everything is working correctly.

    virsh -c qemu:///system list

Step 12: Install Virt-Manager

    sudo apt-get install virt-manager

Step 13 : Open Virtual-Manager and start Virtual Machine. Now try dmesg command in the host system’s terminal.

    dmesg 

Step 15: Install CPUID by using the following command

    sudo apt-get install cupid

Step 16:CPUID gives a whole list of CPUID features of which the first one is the vendor string.

     Run CPUID-l-0x4FFFFFFF  

Ste 17 : It gives the information for eax,ebx,ecx values

    Where it gives eax =total exits :  ebx =total cycle count of hi bit value: ecx =total cycle count of low bit value

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Question : Does the number of exits increase at a stable rate ? Or are there more exits performed during certain VM operations? Answer: Number of exit will not be stable, it will increase as any interpret will occur. There will be more exit as per the operation mode or excecution.

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1. Shivam Tomar(SJSU ID: 015218203)

Build the kernal, modified cpuid.c & vmx.c files, Added nested virtualisation, Tested output

2. Srujana Koripalli(SJSU ID: 013859651)

Reasearched & build the kernal, helped with vmx.c file and output, added nested virtualisation.