CS695 Virtualization and Cloud Computing HW1

Add MIT license and CONTRIBUTORS file

The 64bit mode requires also EFER_LMA flag in sregs->efer.

Avoid C11 features to prevent gcc warnings

Build guest code with -fno-pic

Use the C guest code in 32-bit modes

Add port I/O hypercall example.

Replace 64-bits asm with a small C guest kernel.

Remove GDT

Enter long mode directly, not via ia32e compatibility mode

Set CR0.PG in host code to enter paged mode directly

Fix LVM -> KVM typo in README.

Add support for 64-bit mode

Give names to cr0, cr4 and PDE bits

Renamings