Re: [Xen-devel] How can i get VA from a pfn in HVM guest

To:	胡少龙 <sunofblack@xxxxxxxx>
Subject:	Re: [Xen-devel] How can i get VA from a pfn in HVM guest
From:	Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date:	Thu, 05 Aug 2010 23:07:31 -0700
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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 iuse 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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Re: [Xen-devel] How can i get VA from a pfn in HVM guest