Test: Shadow (page tables) on EPT  -- Enable EPT in L0 and disable it
in L1.  Run Kernel compile with defconfig.

Setup info:
-----------

L0:
    - 4 pCPU, 8G pMEM.
    - Version:
        $ uname -r; rpm -q qemu-kvm libvirt-daemon-kvm libguestfs
        3.12.0-0.rc3.git1.2.fc21.x86_64
        qemu-kvm-1.4.2-7.fc19.x86_64
        libvirt-daemon-kvm-1.0.5.5-1.fc19.x86_64
        libguestfs-1.22.5-1.fc19.x86_64

    - KVM parameters:
        $ cat /sys/module/kvm_intel/parameters/nested
        Y
        $ cat /sys/module/kvm_intel/parameters/enable_shadow_vmcs
        N
        $ cat /sys/module/kvm_intel/parameters/ept
        Y


L1:
    - 4 vCPU, 10G vMEM.
    - Version:
        $ uname -r; rpm -q qemu-kvm libvirt-daemon-kvm libguestfs
        3.12.0-0.rc3.git1.2.fc21.x86_64
        qemu-kvm-1.4.2-7.fc19.x86_64
        libvirt-daemon-kvm-1.0.5.5-1.fc19.x86_64
        libguestfs-1.22.5-1.fc19.x86_64

    - KVM parameters:
        $ cat /sys/module/kvm_intel/parameters/nested
        Y
        $ cat /sys/module/kvm_intel/parameters/enable_shadow_vmcs
        N
        $ cat /sys/module/kvm_intel/parameters/ept
        N


L2:

    - 3 vCPU, 3G vMEM.
    - Version:
        $ uname -r
        3.12.0-0.rc3.git1.2.fc21.x86_64


Build Kernel w/ defconfig on L2:
--------------------------------

    $ yum install git gcc -y
    $ yum-builddep kernel

    $ git clone \
      git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
    $ cd linux

    $ git describe
    v3.12-rc3-267-g6d15ee4
    $ git log | head -1
    commit 6d15ee492809d38bd62237b6d0f6a81d4dd12d15

For 20 iterations of Kernel compile in L2

    $ for i in {1..20}; do make clean; sync; \
      sudo sh -c "echo 3 > /proc/sys/vm/drop_caches" \
      time make -j2; done 2>&1 \
      | tee make-timings-20-iterations-l2-30-aug.txt


NOTES:
-----

 - "make clean" only removes files in file system, but does not clear
   memory (page-cache). To clean it: Either reboot L2 or set
   /proc/sys/vm/drop_caches as below:

     $ sync; echo 3 > /proc/sys/vm/drop_caches

 - To compile kvm.git queue on a test branch

     $ git branch -d test_nept1 origin/queue
     $ make -j6 && make bzImage && make modules 
     $ sudo make modules_install && make install