monitoring guest sidt execution

monitoring guest sidt execution

[matteo]

Hi to all,

 I'm trying to intercept the guest "sidt" instruction execution from the
host

i've added the bit to the control structure:


 control->intercept = | (1ULL << INTERCEPT_STORE_IDTR);

 then I have defined the sidt handler to manage the STORE_IDTR action:


 [SVM_EXIT_IDTR_READ]                    = idtr_write_interception,

 So, in the idtr_write_interception handler there is the invocation of
 the "emulate_instruction(&svm->
vcpu, kvm_run, 0, 0, 0);" function.
 Following the execution flow i found that the emulation failed in the

 x86_emulate.c source file and precisely in the "if (c->d == 0) "
 conditional statement but i really don't know why it happens and how to
 fix it.

could you please give me some hints with respect to this issue?

thanks in advance,

Matteo

Re: monitoring guest sidt execution

[Avi Kivity]

On 11/15/2009 05:37 PM, matteo wrote:
> Hi to all,
>
> I'm trying to intercept the guest "sidt" instruction execution from the
> host
>
> i've added the bit to the control structure:
>
>
> control->intercept = | (1ULL << INTERCEPT_STORE_IDTR);
>
> then I have defined the sidt handler to manage the STORE_IDTR action:
>
>
> [SVM_EXIT_IDTR_READ]                    = idtr_write_interception,
>
> So, in the idtr_write_interception handler there is the invocation of
> the "emulate_instruction(&svm->
> vcpu, kvm_run, 0, 0, 0);" function.
> Following the execution flow i found that the emulation failed in the
>
> x86_emulate.c source file and precisely in the "if (c->d == 0) "
> conditional statement but i really don't know why it happens and how to
> fix it.
>
> could you please give me some hints with respect to this issue?
>

You need to fill the appropriate table entry for sidt (most likely 
group_table) and implement the opcode in the emulator.

-- 
error compiling committee.c: too many arguments to function