Hello I've been working on live migration for ARM-KVM, and noticed problem completing migration with huge 2nd stage tables. Aafter write protecting the VM, for write fault 512 page bits are set in dirty_bitmap[] to take into account future writes to huge page.The pmd is write protected again when QEMU reads the dirty log, and the cycle repeats. With this not even a idle 32MB VM completes live migration. If QEMU uses THPs, and 2nd stage tables use pte's, then there is no problem, live migration is quick. I'm assumung QEMU and Guest huge pages with 2nd stage page table pte's should work fine too. I'm wondering how this has been solved (for any architecture)? - Mario -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
