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Removed the `auto' memory alloc and map from the
original handler. The new handler is simple for now;
it just reads the guest virtual and physical addresses
involved in the fault. The arch-indepent code will be
responsible for deciding what to do.

vmx_handle_external_intr
-- pretty much a straight copy over of the old code,
   but with comments
-- one big difference: interrupts are assumed to be
   enabled when this routine is called (I can't see
   how kvm is allowing the handling of external interrupts
   because it disables them when it enters vmx non-root.
   See the kvm code in x86.c:vcpu_enter_guest.)

lcd_arch_run:
-- disables kernel preemption while lcd is running
-- simple switch on vmx exit conditions

vmx_handle_exception_nmi
-- for nmi's and exceptions generated by lcd

vmx_handle_hard_exception
-- for `hardware exceptions': page faults, traps,
   machine checks

-- Moved some vmx-specific data structures into implementation file.
-- lcd_vmx_* => lcd_arch_*
-- updated virt/lcd/lcd-domains.c

lcd_destroy => lcd_vmx_destroy. Pretty much a straight
copy over, but removed some unneeded code.

Conditional compilation on number of autoload msr's.

Untested.

vmx_setup_vmcs ==> vmx_setup_vmcs_guest_settings and
vmx_setup_vmcs_host.

vmx_setup_vmcs_guest_settings
-- execution control (e.g., interrupt handling)
-- ept pointer
-- %cr0 and %cr4 access control

vmx_setup_vmcs_guest_regs
-- initial %cr0, %cr4
-- segmentation--bases, limits, selectors
-- guest EFER (long mode enabled, no syscall/sysret)
-- initial activity and interrupt state

vmx_setup_vmcs_host
-- control and segmentation regs
-- host EFER
-- no saving of syscall/sysret msrs since these are
   disabled in guest
-- no page attribute table

lcd_create --> lcd_vmx_create, with a lot of code
re-factored or removed for now, to keep it simple
(no gdt, idt, isr, paging bitmap, address space
init, etc.).
-- basic ept initialization
-- vmcs loading on a cpu
   -- re-factored __vmx_setup_cpu to use built-in
      segment descriptor access functions in desc.h
   -- removed host sys_enter storage, since this
      msr is disabled right now anyway
   -- more doc to understand vmcs load process

Added straight copy from old code of lcd_vmx_exit.

Shifted lcd_vmx_init and lcd_vmx_exit to
arch/x86/include/asm/lcd-vmx.h. Ideally, if we want
this to be arch-independent, probably want to change
header to asm/lcd.h, and routines to lcd_arch_init
and lcd_arch_exit, or something similar.

Two components to the lcd build now:
-- arch/x86/lcd/Makefile: for building x86 lcd code
-- virt/lcd/Makefile: for building arch-indep lcd code

Modified the build system just slightly for a cleaner
build:
-- virt/ directory treated like ipc/, usr/, etc. directories
-- added Kconfig and Makefile to virt/, mirroring drivers/
-- updated top-level Makefile to include virt/ as vmlinux
   directory / dependency, so build system will recur into
   virt/
-- updated arch/x86/Kconfig to include virt/Kconfig, so it
   will be included as a menu item
-- updated arch/x86/Kbuild to include arch/x86/lcd/

Removed old capabilities code in cap/.

Removed lcd syscall.

Temporarily turned off build for drivers/lcd.

Fixed most bugs in lcd-vmx (still need to do lcd_vmx_exit).
-- minor naming issues in lcd-vmx.h
-- straight copy over of vmx_disable_intercepts_for_msr,
   but with more doc
-- removed VMX_EPT_INDIVIDUAL_ADDR macro from vmx.h (where
   did this come from? it's not documented in the intel manual,
   nor is it used in kvm)

Added a few missing macros to arch/x86/include/vmx.h,
and RESERVED masks for easily determining which bits
in a vmx control are reserved (needed in adjust_vmx_controls).

Re-factored setup_vmcs_config and adjust_vmx_controls.
setup_vmcs_config does pretty much the same thing, but it
fails immediately if a control isn't available --
adjust_vmx_controls confirms that the exact desired
controls are available, and sets the reserved bits to
1 or 0 as needed. Cleaner comments and organization.
Re-factored the vmx basic settings to
vmcs_config_basic_settings.

Removed some of the vmx feature check code that was in
the original lcd_vmx_init, as setup_vmcs_config now does
that.

Essentially a straight copy over of:

-- __vmx_enable
-- vmx_enable
-- vmx_disable
-- vmx_free_vmxon_areas
-- __vmxon
-- __vmxoff

The only difference is I shifted tbl and cache
invalidation to vmx_enable (originally in __vmx_enable)
and added some comments.

Straight copy over of
-- vmx_alloc_vmcs
-- vmx_free_vmcs
-- invvpid, invept code, with slight renaming

Arch-dependent code will go in arch/x86/lcd, and the
header(s) will reside in arch/x86/include/asm.

For now, I have only moved some of the arch-dependent
junk that was in include/lcd/lcd.h into
arch/x86/include/asm/lcd-vmx.h.