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Re: [Xen-devel] accessing domain's page contents from hypervisor

To: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] accessing domain's page contents from hypervisor
From: Sai Suresh <saisuresh@xxxxxxxxx>
Date: Thu, 12 May 2005 10:45:18 -0500
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Reply-to: Sai Suresh <saisuresh@xxxxxxxxx>
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Actually, I was passing the machine address in that variable :) I was using the code to debug, and didnt bother to change the variable name. Its type is unsigned long. It seems to contain a valid machine address, as it fell in the range between alloc_start and alloc_end that is allocated to a domain.



On 5/12/05, Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx> wrote:

> I was trying to read the contents of a domain's L1 page table
> page from hypervisor.
> The system reboots whenever I dereference the contents of a page.
> I use the map_domain_mem and unmap_domain_mem functions
> before and after I dereference it.
> Any suggestions on the possible reasons would be really helpful.

map_domain_mem takes a machine address

Ian

> /*----------------------code---start------------------------------*/
>     unsigned long * pg;
>     int i;
>     list_for_each_entry(page, &d->page_list, list)
>     {
>         if ( (page->u.inuse.type_info & PGT_type_mask) ==
> PGT_l1_page_table){
>
>             pg = (unsigned long *) map_domain_mem(domain_id);
>              for(i=0; i<1024; i++) {
>                 if( ( pg != NULL) &&  (pg[i] & 0x00000041) )
>                 count++;
>               }
>          }
>          unmap_domain_mem(pg);
>      }
> /*----------------------code---end------------------------------*/
>
>

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