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[Xen-devel] Any available page table entry bits in Xen??

Hi, I'm working on Xen 3.2.1 and
I'd like to know if there's any available bit in page table entries, on x86_32 (no pae), especially on L1 page table entry. It seems to me that all bits are used by Xen. Xen disallows all AVAIL bits and PCD/PWT/PAT bits to their guest and use them all? I've tried PCD/PWT/AVAIL bits but I couldn't find any availables. (didn't try PAT)
Or it was my mistake?
I'd like to know exactly what bits in page table I can safely and exclusively use in Xen..
Any available bit in page table entry or ideas?
thank you in advance!!


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