Xen devel - Aug 2005 - RE: [Xen-bugs] [Bug 122] Dom0 fails to boot on SLES 9 machines compiledwith x86 PAE mode ON

> I think it''s probably a property of the SLES 9 compiler used 
> to compile Xen and Linux. I have two identical machines, one 
> with SLES 9 and the other with RHEL 4, and the RHEL 4 box 
> works fine. Also, I have a 3rd machine of a different model 
> loaded with SLES 9 which is also not booting with PAE
''on''.
> That points to SLES 9. 
Is it still the case with the very latest tree, i.e. where the default
build is pentiumpro rather than pentium4?

Ian

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Ian Pratt wrote:
> 
>  
>
>>I think it''s probably a property of the SLES 9 compiler used 
>>to compile Xen and Linux. I have two identical machines, one 
>>with SLES 9 and the other with RHEL 4, and the RHEL 4 box 
>>works fine. Also, I have a 3rd machine of a different model 
>>loaded with SLES 9 which is also not booting with PAE
''on''.
>>That points to SLES 9. 
>>    
>>
>
>Is it still the case with the very latest tree, i.e. where the default
>build is pentiumpro rather than pentium4?
>  
>
We haven''t tried it yet this morning. 
>Ian
>
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>
>  
>

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On Wed, 3 Aug 2005 15:40:38 +0100, Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
wrote:
>
>> I think it''s probably a property of the SLES 9 compiler used
>> to compile Xen and Linux. I have two identical machines, one
>> with SLES 9 and the other with RHEL 4, and the RHEL 4 box
>> works fine. Also, I have a 3rd machine of a different model
>> loaded with SLES 9 which is also not booting with PAE
''on''.
>> That points to SLES 9.
>
> Is it still the case with the very latest tree, i.e. where the default
> build is pentiumpro rather than pentium4?

I''m seeing this on an x440 with SLES 9, using changeset 6003.
Interestingly, I make it past this point if I specify mem=4G at boot.

The crash happens very early on when booting Xen so I don''t
think Linux can be the problem.  I tossed some printk''s into
paging_init() (that''s where the last line of output came
 from in the original boot log) to see if it dies in that function.

It seems to die somewhere in this code as I see the first printk message,
but not the last as it is about to exit:

xen/arch/x86/x86_32/mm.c, starting at line 95:
     printk("paging_init: about to allocate and map machine-to-phys
table\n");
     /*
      * Allocate and map the machine-to-phys table and create read-only mapping
      * of MPT for guest-OS use.  Without PAE we''ll end up with one 4MB
page,
      * with PAE we''ll allocate 2MB pages depending on the amount of
memory
      * installed, but at least 4MB to cover 4GB address space.  This is needed
      * to make PCI I/O memory address lookups work in guests.
      */
     if ( (mpt_size = max_page * 4) < (4*1024*1024) )
         mpt_size = 4*1024*1024;
     for ( i = 0; i < (mpt_size >> L2_PAGETABLE_SHIFT); i++ )
     {
         if ( (pg = alloc_domheap_pages(NULL, PAGETABLE_ORDER, 0)) == NULL )
             panic("Not enough memory to bootstrap Xen.\n");
         idle_pg_table_l2[l2_linear_offset(RDWR_MPT_VIRT_START) + i]            
l2e_from_page(pg, PAGE_HYPERVISOR | _PAGE_PSE);
         idle_pg_table_l2[l2_linear_offset(RO_MPT_VIRT_START) + i]             
l2e_from_page(pg, (__PAGE_HYPERVISOR | _PAGE_PSE) & ~_PAGE_RW);
     }
     memset((void *)RDWR_MPT_VIRT_START, 0x55, mpt_size);

     /* Create page tables for ioremap(). */
     for ( i = 0; i < (IOREMAP_MBYTES >> (L2_PAGETABLE_SHIFT - 20));
i++ )
     {
         ioremap_pt = alloc_xenheap_page();
         clear_page(ioremap_pt);
         idle_pg_table_l2[l2_linear_offset(IOREMAP_VIRT_START) + i]             
l2e_from_page(virt_to_page(ioremap_pt), __PAGE_HYPERVISOR);
     }

     /* Set up mapping cache for domain pages. */
     mapcache_order = get_order(MAPCACHE_MBYTES << (20 -
PAGETABLE_ORDER));
     mapcache = alloc_xenheap_pages(mapcache_order);
     memset(mapcache, 0, PAGE_SIZE << mapcache_order);
     for ( i = 0; i < (MAPCACHE_MBYTES >> (L2_PAGETABLE_SHIFT - 20));
i++ )
         idle_pg_table_l2[l2_linear_offset(MAPCACHE_VIRT_START) + i]            
l2e_from_page(virt_to_page(mapcache) + i, __PAGE_HYPERVISOR);

    printk("paging_init: exiting function\n");
}
 


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On 3 Aug 2005, at 16:01, Natasha Jarymowycz wrote:
> I''m seeing this on an x440 with SLES 9, using changeset 6003.
> Interestingly, I make it past this point if I specify mem=4G at boot.
>
> The crash happens very early on when booting Xen so I don''t
> think Linux can be the problem.  I tossed some printk''s into
> paging_init() (that''s where the last line of output came
> from in the original boot log) to see if it dies in that function.
>
> It seems to die somewhere in this code as I see the first printk 
> message,
> but not the last as it is about to exit:
I strongly doubt anyone has tested PAE Xen on a >4GB machine. You are 
trailblazing. ;-)

I think Gerd''s test box isn''t even SMP.

We have a 8GB box we could do some testing on...

  -- Keir


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Keir Fraser <Keir.Fraser@cl.cam.ac.uk> writes:
> I strongly doubt anyone has tested PAE Xen on a >4GB machine. You are
> trailblazing. ;-)
> 
> I think Gerd''s test box isn''t even SMP.
It''s hyperthreaded, so it''s SMP, but has 1GB only.

I''ll look at the 4GB issues soon, I''ve got access to a big
machine
with >4GB of memory in the suse hw labs, busy setting it up right now.
Stay tuned, most likely some patches show up on the list next days ;)

  Gerd

-- 
panic("it works"); /* avoid being flooded with debug messages */

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On Wed, 2005-08-03 at 16:09 +0100, Keir Fraser wrote:
> On 3 Aug 2005, at 16:01, Natasha Jarymowycz wrote:
> 
> > I''m seeing this on an x440 with SLES 9, using changeset 6003.
> > Interestingly, I make it past this point if I specify mem=4G at boot.
> >
> > The crash happens very early on when booting Xen so I don''t
> > think Linux can be the problem.  I tossed some printk''s into
> > paging_init() (that''s where the last line of output came
> > from in the original boot log) to see if it dies in that function.
> >
> > It seems to die somewhere in this code as I see the first printk 
> > message,
> > but not the last as it is about to exit:
> 
> I strongly doubt anyone has tested PAE Xen on a >4GB machine. You are 
> trailblazing. ;-)
Not true, just not successfully yet.  I have a 4G and a 6G box I''m
testing PAE with right now, blocked on bug 135 though.

-- 
Thanks,
Paul Larson
plars@linuxtestproject.org
http://www.linuxtestproject.org


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