Access violation - code c0000005

[kouzhudong]

2: kd> g
22:34:38.582	DBG	#2	    4	 8920	System         	Log thread started (TID= 00000000000022D8).
22:34:50.316	INF	#0	    4	  572	System         	Log has been initialized.
22:34:50.316	DBG	#2	    4	  572	System         	Info= FFFFF805BB36C090, Buffer= FFFF9E0C2E302000 FFFF9E0C2E334000, File= \SystemRoot\HyperPlatform.log
22:34:50.316	DBG	#2	    4	  572	System         	Found a hard coded PTE_BASE at fffff803635ca382
22:34:50.316	DBG	#2	    4	  572	System         	PXE at ffff81c0e0703000, PPE at ffff81c0e0600000, PDE at ffff81c0c0000000, PTE at ffff818000000000
22:34:50.316	DBG	#2	    4	  572	System         	Physical Memory Range: 0000000000002000 - 00000000000a0000
22:34:50.316	DBG	#2	    4	  572	System         	Physical Memory Range: 0000000000100000 - 000000000db83000
22:34:50.316	DBG	#2	    4	  572	System         	Physical Memory Range: 000000000db84000 - 000000000eaf0000
22:34:50.316	DBG	#2	    4	  572	System         	Physical Memory Range: 000000000eb18000 - 000000000fb6f000
22:34:50.316	DBG	#2	    4	  572	System         	Physical Memory Range: 000000000fbff000 - 00000000c0000000
22:34:50.316	DBG	#2	    4	  572	System         	Physical Memory Range: 0000000100000000 - 0000000180000000
22:34:50.316	DBG	#2	    4	  572	System         	Physical Memory Total: 5241748 KB
22:34:50.316	DBG	#2	    4	  572	System         	shared_data           = FFFF9E0C29CD9720
22:34:50.316	DBG	#2	    4	  572	System         	MTRR Default=0, VariableCount=8, FixedSupported=1, FixedEnabled=1
22:34:50.316	INF	#0	    4	  572	System         	Initializing VMX for the processor 0.
Access violation - code c0000005 (!!! second chance !!!)
HyperPlatform!EptpConstructTables+0x13f:
fffff805`bb36197f 48833800        cmp     qword ptr [rax],0
0: kd> g
Access violation - code c0000005 (!!! second chance !!!)
HyperPlatform!EptpConstructTables+0x13f:
fffff805`bb36197f 48833800        cmp     qword ptr [rax],0
0: kd> g
Access violation - code c0000005 (!!! second chance !!!)
HyperPlatform!EptpConstructTables+0x13f:
fffff805`bb36197f 48833800        cmp     qword ptr [rax],0
0: kd> kv
 # Child-SP          RetAddr           : Args to Child                                                           : Call Site
00 ffff998a`74189c90 fffff805`bb36194d : 00000000`00000000 ffff81c0`00000003 00000000`00002000 00000000`00000000 : HyperPlatform!EptpConstructTables+0x13f [D:\code\Windows\vt\HyperPlatform\HyperPlatform\ept.cpp @ 511] 
01 ffff998a`74189d30 fffff805`bb37627f : ffff9e0c`2ce7c000 00000000`00000004 00000000`00002000 00000000`00000000 : HyperPlatform!EptpConstructTables+0x10d [D:\code\Windows\vt\HyperPlatform\HyperPlatform\ept.cpp @ 503] 
02 ffff998a`74189dd0 fffff805`bb378612 : 00000000`00000200 00000000`00000028 00000000`50707948 00000000`00000000 : HyperPlatform!EptInitialization+0x20f [D:\code\Windows\vt\HyperPlatform\HyperPlatform\ept.cpp @ 435] 
03 ffff998a`74189e80 fffff805`bb361033 : ffff998a`74189f20 fffff805`bb361057 ffff9e0c`29cd9720 00000000`00000000 : HyperPlatform!VmpInitializeVm+0xa2 [D:\code\Windows\vt\HyperPlatform\HyperPlatform\vm.cpp @ 379] 
04 ffff998a`74189f00 ffff998a`74189f20 : fffff805`bb361057 ffff9e0c`29cd9720 00000000`00000000 ffffe18f`017a51d0 : HyperPlatform!AsmInitializeVm+0x33 [D:\code\Windows\vt\HyperPlatform\HyperPlatform\Arch\x64\x64.asm @ 114] 
05 ffff998a`74189f08 fffff805`bb361057 : ffff9e0c`29cd9720 00000000`00000000 ffffe18f`017a51d0 ffff9e0c`2e60ee30 : 0xffff998a`74189f20
06 ffff998a`74189f10 ffff9e0c`29cd9720 : 00000000`00000000 ffffe18f`017a51d0 ffff9e0c`2e60ee30 00000000`00000002 : HyperPlatform!AsmInitializeVm+0x57 [D:\code\Windows\vt\HyperPlatform\HyperPlatform\Arch\x64\x64.asm @ 124] 
07 ffff998a`74189f18 00000000`00000000 : ffffe18f`017a51d0 ffff9e0c`2e60ee30 00000000`00000002 ffffffff`80002f44 : 0xffff9e0c`29cd9720
0: kd> vertarget 
Windows 10 Kernel Version 22621 MP (4 procs) Free x64
Built by: 22621.1.amd64fre.ni_release.220506-1250
Machine Name:
Kernel base = 0xfffff803`6321a000 PsLoadedModuleList = 0xfffff803`63e2d4f0
Debug session time: Tue Jan 21 22:34:50.316 2025 (UTC + 8:00)
System Uptime: 0 days 0:01:13.898
0: kd> lmvm HyperPlatform
Browse full module list
start             end                 module name
fffff805`bb360000 fffff805`bb37e000   HyperPlatform   (private pdb symbols)  D:\code\Windows\vt\HyperPlatform\x64\Debug\HyperPlatform.pdb
    Loaded symbol image file: HyperPlatform.sys
    Image path: HyperPlatform.sys
    Image name: HyperPlatform.sys
    Browse all global symbols  functions  data
    Timestamp:        Tue Jan 21 22:31:35 2025 (678FAFC7)
    CheckSum:         00019276
    ImageSize:        0001E000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4
    Information from resource tables:

this is the code(I didn't modify a single byte of the code):

    case 3: {
      // table == PDPT (1 GB)
      const auto ppe_index = EptpAddressToPpeIndex(physical_address);
      const auto ept_pdpt_entry = &table[ppe_index];
      if (!ept_pdpt_entry->all) {
        const auto ept_pdt = EptpAllocateEptEntry(ept_data);
        if (!ept_pdt) {
          return nullptr;
        }
        EptpInitTableEntry(ept_pdpt_entry, table_level, UtilPaFromVa(ept_pdt));
      }
      return EptpConstructTables(static_cast<EptCommonEntry *>(
              UtilVaFromPfn(ept_pdpt_entry->fields.physial_address)),
          table_level - 1, physical_address, ept_data);
    }

[kouzhudong]

0: kd> !cpuinfo 
CP  F/M/S Manufacturer  MHz PRCB Signature    MSR 8B Signature Features
 0  6,140,1 GenuineIntel 2803 0000008600000000 >0000008600000000<3d1b3dff
 1  6,140,1 GenuineIntel 2803 0000008600000000                   3d1b3dff
 2  6,140,1 GenuineIntel 2803 0000008600000000                   3d1b3dff
 3  6,140,1 GenuineIntel 2803 0000008600000000                   3d1b3dff
                      Cached Update Signature 0000008600000000
                     Initial Update Signature 0000008600000000

[kouzhudong]