Re: [Xen-devel] how can I find code of hypercall?

[leilei175 <leilei175@xxxxxxxxx>]

Hi, keir and Jayaraman,
Thanks for your explanation

Keir Fraser wrote:
> On 11/03/2009 10:08, "Jayaraman, Bhaskar" <Bhaskar.Jayaraman@xxxxxxx> wrote:
>
>   
> > I've done this on an HVM. For Intel, you can go to platform-pci and dump the
> > hypercall page on the console 4 bytes at a time. Each 4 byte value on the
> > hypercall page constitutes an Intel x86 instruction, and you should find
> > something like this: -
> > 0xc1010f00 
> > 0xccccccc3 
> >     
> You know x86 instructions are not fixed-length, right? Actually the
> instruction sequence is:
>  0xb8 <imm32>   : mov imm32,%eax (5-byte instruction)
>  0x0f 0x01 0xc1 : vmcall (3-byte instruction)
>  0xc3           : ret (1-byte instruction)
>
> See xen/arch/x86/hvm/vmx/vmx.c:vmx_init_hypercall_page().
>
>  -- Keir
>
>
>
>   

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