From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sai Suresh <saisuresh@gmail.com>
Subject: accessing domain's page contents from hypervisor
Date: Thu, 12 May 2005 03:59:43 -0500
Message-ID: <b3acd0760505120159701df3dd@mail.gmail.com>
Reply-To: Sai Suresh <saisuresh@gmail.com>
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Hi,

I was trying to read the contents of a domain's L1 page table page from=20
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=
=20
dereference it.
Any suggestions on the possible reasons would be really helpful.

Thanks,
Sai


/*----------------------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) =3D=3D PGT_l1_page_table){

pg =3D (unsigned long *) map_domain_mem(domain_id);
for(i=3D0; i<1024; i++) {
if( ( pg !=3D NULL) && (pg[i] & 0x00000041) )
count++;
}
}
unmap_domain_mem(pg);
}
/*----------------------code---end------------------------------*/

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Hi,<br>
<br>
I was trying to read the contents of a domain's L1 page table page from hyp=
ervisor.<br>
The system reboots whenever I dereference the contents of a page.<br>
I use the map_domain_mem and unmap_domain_mem functions before and after I =
dereference it.<br>
Any suggestions on the possible reasons would be really helpful.<br>
<br>
Thanks,<br>
Sai<br>
<br>
<br>
/*----------------------code---start------------------------------*/<br>
&nbsp;&nbsp;&nbsp; unsigned long * pg;<br>
&nbsp;&nbsp;&nbsp; int i;<br>
&nbsp;&nbsp;&nbsp; list_for_each_entry(page, &amp;d-&gt;page_list, list)<br=
>
&nbsp;&nbsp;&nbsp; {<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if ( (page-&gt;u.inuse.type_info=
 &amp; PGT_type_mask) =3D=3D PGT_l1_page_table){<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pg =3D (=
unsigned long *) map_domain_mem(domain_id);<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fo=
r(i=3D0; i&lt;1024; i++) {<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;
if( ( pg !=3D NULL) &amp;&amp;&nbsp; (pg[i] &amp; 0x00000041) )<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; count++;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; }<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unmap_domain_mem(pg);<br>
&nbsp;&nbsp;&nbsp;&nbsp; }<br>
/*----------------------code---end------------------------------*/<br>

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