Re: [Xen-ia64-devel] Memory problem with mini-os

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Lundi 02 Octobre 2006 09:35, Dietmar Hahn a écrit :
> Hi,
>
> after my vacation I switched from xen-ia64 change-set 11039 to 11635.
> And now I have a problem with my mini-os executing the efi/pal code
> (currently the getTime - function from efi). Every time the function gets
> called I get an trap 22 (Instruction access rights vector). The strange
> thing is that the trap also occurs if I don't do the mapping of the pal
> code.
> I inserted some trace messages in vcpu_itr_i() in xen to see all
> parameters. But it looks ok.
> For a test I removed the call of in ia64_itr() in efi_map_pal_code() in the
> linux code and nevertheless efi_gettimeofday() runs fine (linux as domU).
>  It seems, there is another tlb entry for this page.
> I saw that the pal/efi stuff was reorganized in the new change-set.
> Can anybody give me a hint where to look in the memory handling or do some
> trace messages! I'm currently still not familiar enough with this stuff.
Hi,

After your comments I have reorganized fw memory.
The PAL/SAL/EFI firmware is now between 0 and 4Kb.
ACPI and system tables are between 4Kb and 12Kb.
Because the size is very small there might be an entry in the TLB even without 
the itr.

I think you should start debugging gu understand where and why the fault 
occurs.  You may modify Xen to disp more details when a fault is reflected.

Tristan.

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