[x86] Initial implemenation of VM framework.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Enable log levels in VM prints

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] MMU Initialization for guest.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Initialize VCPU capabilities for guest for AMD Proc.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Add support to create one guest.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Added bootcmd for loading guest0

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Added generic exception handlers for unhandled exceptions

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Removed opcode macros for vmxxx instructions

Since GCC 4.x supports these opcodes directly, there is
no need to define the opcodes. Use the instructions
directly.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Guest VCPU trampoline code to boot in guest.

Guest VCPU cannot run at the PC specified in DTS. The
VCPU has to first populate VMCB correctly can call
vmload/vmrun subsequently to switch to guest mode. For
all this it needs to run VMM code.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Minor fix in VM_LOG macro.

The print was stringifying the format string
again to pring double quotes in output. Now fixed.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Minor compilation warning fix.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Fixed the svm run function

Assembler used to clobber the rAX register
as part of calling svm_launch. Now passing
VMCB as part of argument to svm_launch (in rdi).
svm_launch loads rAX with value in rdi before
calling vmload/vmrun.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Fix the offsets of segments in VMCB.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Add handle for triple fault in guest.

o As part of triple fault handling in a vcpu,
  the guest related to vcpu is halted.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Removed unused vmdb file and its references.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Add intercept types and enable them

o Added all the intercept type definitions.
o Enabled almost all of them for now to verify the
  custom firmware.
o With this the paged real mode page faults are
  being correctly intercepted and given to VMM.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Point VM reset vector to base of BIOS area.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>