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

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

Are you sure you weren't passing a domain "physical" address rather than a 
real "machine" address?

Cheers,
Mark

On Thursday 12 May 2005 16:45, Sai Suresh wrote:
> 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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