On Mon, 2014-02-24 at 17:30 +0100, Laurent Dufour wrote: > In copy_oldmem_page, the current check using max_pfn and min_low_pfn to > decide if the page is backed or not, is not valid when the memory layout is > not continuous. > > This happens when running as a QEMU/KVM guest, where RTAS is mapped higher > in the memory. In that case max_pfn points to the end of RTAS, and a hole > between the end of the kdump kernel and RTAS is not backed by PTEs. As a > consequence, the kdump kernel is crashing in copy_oldmem_page when accessing > in a direct way the pages in that hole. > > This fix relies on the memblock's service memblock_is_region_memory to > check if the read page is part or not of the directly accessible memory.
Hi Laurent, This looks good to me, assuming you've tested it on a PowerVM system as well as under KVM. cheers _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
