>>> On 17.03.16 at 15:44, <andrew.coop...@citrix.com> wrote: > On 17/03/16 14:31, Jan Beulich wrote: >> Also - do we really want to make this code dependent on >> map_pages_to_xen() not intermediately zapping the mappings >> being changed? > > Do you mean "immediately"?
No. > As far as I can tell, it is guaranteed to be safe, even when remapping > the code section. Updates to the live pagetables are using atomic > writes, and I didn't spot a point which would end up with a transient > non-present mapping. But we may, at some point and for whatever reason, come to make the function zap the mapping (i.e. clear the present bit), flush, and only the re-establish the new mapping. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
