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 ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
> 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?Most likely the page that you are trying to modify is mapped read-only. Any PTE linear address passed to update_va_mapping() /must/ be writeable, or teh update will fail. -- Keir ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel