[Xen-devel] Failure in update_l1e()

[Jacob Gorm Hansen <jacob@xxxxxxxx>]

hi,

I am seeing occasional failures of cmpxchg_user() in update_l1e().
According to the the comments in the source, this is due to a page fault
caused by the update.

The error looks like this:

(XEN) DOM5: (file=memory.c, line=670) Failed to update 08fe6065 ->
08fe6465: saw 08fe6065
DOM5: Failed update VA mapping: 000bffff, 08fe6465, 00000002

The odd value is due to a special use of one of the AVL bits for my own
purposes.

This only happens when page_nr is 000bffff for some reason.

Any ideas what may be going wrong here?

thanks,
Jacob



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