vm14hw2

Virtual Machine Homework 2, Spring 2014

Overview

• Topic: a study of system virtual machine

• Team

  • b00902064 Hao-En Sung @ ntu csie
  • b00902107 Shu-Hung You @ ntu csie

• Abstract

  Our code can be found at https://github.com/suhorng/vm14hw2

  We studied the same ISA system virtual machine on a simulated ARM Cortex A15x1 platform. We built one host VM which ran one or more guest VMs, traced the hypervisor traps in the kvm module. We also ran serveral benchmarks on multiple guest VMs to observe the loadings.

• Source File Structure

  • README.md: some notes and explanation of the repo.
  • report.pdf: our study report
  • linuv-kvm: our full source code; build kernel image here.
  • fs/: where we put our host_disk.img; absent on the repo.
    • fs/host_utils/: the scripts we put on the host VM to help manipulating traces, launch the guest VM, etc.
  • boot/: our params file; the other .dtb files are not pushed
  • report/: the source of our report

• Virtual Machines' Screenshot

  

Homework Notes

Important Files & Directories

• arch/arm/kvm/

  • arm.c: int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
  • handle_exit.c: int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
  • trace.h

• arch/arm/include/asm/

  • kvm_asm.h

• include/include/

  • kvm_host.h: kvm_guest_exit(void)
  • context_tracking.h: guest_exit(void)

• virt/kvm/

  • kvm_main.c: int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)

Some random notes

kvm_arch_vcpu_ioctl_run

while (ret > 0) ... 迴圈的方式讓 CPU 一直 run, 除非 interrupt/trap 才離開 kvm_guest_enter();

ivm_timer_sync_hwstate kvm_vgic_sync_hwstate handle_exit => switch (exception_index) ....

arch/arm/kvm

trace.h