[Xen-users] Possible problem with PAE?

["Mike Levenhagen" <mjleven@xxxxxxxxxx>]

I'm porting an OS to XEN 3.0 that uses PAE mode.
It maps both virtual address space 0x00000000 and 0xC0000000 to the  
same physical address space, hence pgd slot 0 and pgd slot 3 point to  
the same middle page directory. It appears that XEN does not support  
this situation. The XEN error message I get when I try to pin the pgd is
(XEN) DOM154: (file=mm.c, line=905) Failure in alloc_l3_table: entry 3
(XEN) DOM154: (file=mm.c, line=1550) Error while validating mfn d2a9  
(pfn 10) for type 67ff0000: caf=80000003 taf=67ff0001
(XEN) DOM154: (file=mm.c, line=1780) Error while pinning mfn d2a9

If I set pgd slot 0 to 0 the pin succeeds.

Does XEN support this "duplicate" mapping?
Is this the right place to ask this question?

Michael Levenhagen
Sandia National Labs.





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