Xen devel - Aug 2010 - How can i get VA from a pfn in HVM guest

Hi,
    After i get the pfn in a hvm guest using following code, how can i use it?
Simply using __va() seems wrong, for the ( param.value << PAGE_SHIFT )
is feffc000 in my test module, using __va() will overflow.
    
    xen_hvm_param_t param; 
    param.domid = DOMID_SELF; 
    param.index = HVM_PARAM_STORE_PFN; 
    hypercall_hvm_op(HVMOP_get_param, &param);



      

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On 08/05/2010 04:39 PM, 胡少龙   wrote:
> Hi,
>     After i get the pfn in a hvm guest using following code, how can i 
> use it? Simply using __va() seems wrong, for the ( param.value << 
> PAGE_SHIFT ) is feffc000 in my test module, using __va() will overflow.
>     xen_hvm_param_t param;
>     param.domid = DOMID_SELF;
>     param.index = HVM_PARAM_STORE_PFN;
>     hypercall_hvm_op(HVMOP_get_param, &param);
>
You need to ioremap it.

     J

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