Re: [Xen-users] Re: [Xen-devel] Xen - Guest memory allocation

["Grzegorz Miłoś" <gm281@xxxxxxxxx>]

> Hi,
>
>              if I use the following inside the populate_physmap() inside
> xen/common/memory.c,
>
> unsigned long maddr_pci = 0xdf000000;       //since I know the machine
> address of the mememory behind my pci device <xm dmesg>
>
> static void populate_physmap(struct memop_args *a)
> {
>         /******
>
>              for(i=a->nr_done; i<a->nr_extents; i++)
>              {
>                           /*************
>                  &nb sp;    if(d->is_privilaged)
>
>               page = alloc_domheap_pages(d, a->extent_order, a->memflags |
> MEMF_node(node));
>         else
>          {
>               page = maddr_to_page(maddr_pci);

This is going to assign DomU IO pages _only_.

>               maddr_pci = ((maddr + PAGE_SIZE-1) &PAGE_MASK);

What is maddr here? Did you mean maddr_pci? Also, (page_aligned_x +
PAGE_SIZE - 1) & PAGE_MASK = page_aligned_x, in other words you are
stuck on the same page.

>
> `  &nbsp ;                         }
>                    /***************
>                 }
>         printk("a->nr_done: %lx", a->nr_done);
>    }
>
> The printk says "a->nr_done: 2000" when 'xm dmesg' is used (which is correct
> since I allocated 32MB for DomU = 8192 pages = 0x2000)
>
> but exits with the following error:
>
> & n bsp;            'dmesg' says : Using config file
> "/home/guest/Guest.conf".
>                        Error: (1, 'Internal error', 'xc_dom_boot_domU_map:
> failed to mmap domU pages 0x200+0x2e3 [xenctl, rc=-1]\n'
>
>              'xm dmesg' says: <G><1>mm.c:671:d0 Non-privileged (1) attempt
> to map I/O space 000df1ff

Dom0 tried map DomU memory in order to load the kernel + other boot
info. This fails because you've only allocated IO pages to DomU.

Cheers
Gr(z)egor(z)

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel