problem with vmwrite instruction

fanwenyi0529 — Wed, 28 Dec 2011 14:42:57 GMT

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.

problem with vmwrite instruction

fanwenyi0529 — Sun, 01 Jan 2012 01:17:51 GMT

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.

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problem with vmwrite instruction

problem with vmwrite instruction