problem with vmwrite instruction

[fanwenyi0529]

Hello,

I am writing a code with intel vmx architecture(for vm purpose),here are my troubles:

I use asm and cpp to write my code, for convinient purpose, I writethis code to call by cpp:

__VMWRITE64_ proc Field:qword,pData:qword

push r10

mov r10,qword ptr[rdx]

xor rax,rax

mov eax,ecx

VMWRITE rax,r10

pop r10

jc error

jz error

jmp endok

error:

xor rax,rax

ret

endok:

mov rax,1

ret

__VMWRITE64_ endp

and this is the caller:

re = __VMWRITE64(VMX_VMCS16_HOST_FIELD_CS, (u64*)&cs);

that code sometimes works well,but sometimes it cause BSOD on my Windows 7 X64, the CS selector of my OS is always 0x10,I am frustrated, because that BSOD do not have anyregular patterns.My cpu is core i3 2100 ,could you help me?

Thanks.

[fanwenyi0529]

Problem resolved. i3 2100 has 4 logic processor,my code works in PASSIVE_LEVEL,sometimes it may be interrupted and scheduled to another processor after VMXON,but the processor have changed on is not in VMX operation,so it cause #UD.

When I Raise the IRQL to DISPATCH_LEVL,my code can't be scheduled,that code works well now.