Type-2 Intel hypervisor for Windows 10 systems

Go to file

_xeroxz 0d63ad288a added idt and gdt starter code...		4 years ago
demo	idk what i added	4 years ago
README.md	Update README.md	4 years ago
VMCS-CONTROLS.md	Update VMCS.md	4 years ago
VMCS-GUEST.md	Update VMCS-GUEST.md	4 years ago
bluepill.sln	idk what i added	4 years ago
bluepill.vcxproj	added idt and gdt starter code...	4 years ago
bluepill.vcxproj.filters	added idt and gdt starter code...	4 years ago
bluepill.vcxproj.user	vmxlaunch is working... still some issues with host stack i think, need	4 years ago
drv_entry.cpp	added idt and gdt starter code...	4 years ago
exit_handler.cpp	added idt and gdt starter code...	4 years ago
gdt.cpp	added idt and gdt starter code...	4 years ago
gdt.hpp	added idt and gdt starter code...	4 years ago
hv_types.hpp	added idt and gdt starter code...	4 years ago
ia32.hpp	idk what i added	4 years ago
idt.cpp	added idt and gdt starter code...	4 years ago
idt.hpp	added idt and gdt starter code...	4 years ago
idt_handlers.asm	added idt and gdt starter code...	4 years ago
invd.asm	added idt and gdt starter code...	4 years ago
invd.hpp	added idt and gdt starter code...	4 years ago
mm.cpp	added idt and gdt starter code...	4 years ago
mm.hpp	added idt and gdt starter code...	4 years ago
segment_intrin.asm	getting rekted by vmxerror 7 (invalid control fields)	4 years ago
segment_intrin.h	added idt and gdt starter code...	4 years ago
vmcs.cpp	added idt and gdt starter code...	4 years ago
vmcs.hpp	added idt and gdt starter code...	4 years ago
vmxexit_handler.asm	idk what i added	4 years ago
vmxexit_handler.h	added idt and gdt starter code...	4 years ago
vmxlaunch.cpp	added idt and gdt starter code...	4 years ago
vmxlaunch.hpp	added idt and gdt starter code...	4 years ago
vmxon.cpp	added idt and gdt starter code...	4 years ago
vmxon.hpp	init commit	4 years ago

README.md

Figure 1. First ever vmexit...

Bluepill

Bluepill is an Intel type-2 research hypervisor. This project is purely for educational purposes and is designed to run on Windows 10 systems. This project uses WDK and thus Windows Kernel functions to facilitate vmxlaunch.

VMCS

This section of the readme just contains notes and a list of things I stumbled on and took me a while to figure out and fix.

VMCS Controls

One of the mistakes I made early on was setting bits high after applying high/low MSR values. For example my xeons dont support Intel Processor Trace (Intel PT) and I was setting entry_ctls.conceal_vmx_from_pt = true after applying the MSR high/low masks. This caused vmxerror #7 (invalid vmcs controls). Now i set the bit high before i apply the high/low bit mask so if my hypervisor runs on a cpu that has Intel PT support it will be concealed from Intel PT.
My xeons also dont support xsave/xrstor and I was setting enable_xsave in secondary processor based vmexit controls after applying IA32_VMX_PROCBASED_CTLS2 high/low bitmask. Which caused vmxerror #7 (invalid vmcs controls).

Dump of VMCS control fields can be found here. This is not required, but for learning its nice to see exactly what the MSR masks are, and what VMCS field's are enabled after you apply high/low bit masks.

VMCS Guest State

After getting my first vmexit the exit reason was 0x80000021 (invalid guest state). I thought it was segmentation code since I've never done anything with segments before but after a few days of checking every single segment check in chapter 26 section 3, I continued reading the guest requirements in chapter 24 section 4, part 2 goes over non-register states and I was not setting VMCS_GUEST_ACTIVITY_STATE to zero.

Dump of VMCS guest fields can be found here.