>>> On 06.09.15 at 22:05, <wei.l...@citrix.com> wrote: > The original implementation of populate_pfns didn't consider the same > pfn can be present multiple times in the array. The mechanism to prevent > populating the same pfn multiple times only worked if the recurring pfn > appeared in different batches. > > This bug is discovered by Linux 4.1 32 bit kernel save / restore test, > which has several ptes pointing to same pfn, which results in an array > containing recurring pfn.
Since you must have debugged this, and since the bisector appears to have fingered a patch of mine on the Linux side which triggered this, would you mind explaining this a little more? In particular I'm worried that this may point out some other bug in Linux, as in the context of the change there - dealing with the 1:1 mapping - I can't see a legitimate reason for multiple PTEs to reference the same PFN. Thanks, Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
