Zachary Amsden wrote: > Found this looping Ubuntu installs with VMI. > > If unlucky enough to hit a vmalloc sync fault during a lazy mode > operation (from an IRQ handler for a module which was not yet > populated in current page directory, or from inside copy_one_pte, > which touches swap_map, and hit in an unused 4M region), the required > PDE update would never get flushed, causing an infinite page fault loop. Ah, good catch. > This bug affects any paravirt-ops backend which uses lazy updates, I > believe that makes it a bug in Xen, VMI and lguest. It only happens > on LOWMEM kernels. No, under Xen the kernel/hypervisor PMD is not shared between processes, so this is still used when PAE is enabled. J _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization