On 08/13/2009 09:15 AM, Michael S. Tsirkin wrote: > >> I wonder though if mmu notifiers can be used to make it transparent... >> > > Maybe they can, but that decision belongs to KVM. > Avi, what do you think? > > I don't see how mmu notifiers help. You can use mmu notifiers to sync an external mmu to the linux pagetables, but that's not the case here. I see the following options: - mprotect() guest memory, trap faults, mprotect() back Will work, but exceedingly slowly and wastefully - add a generic user visible dirty bit tracking based on linux ptes A lot of work, not sure if useful beyond kvm - implement vhost dirty bit tracking Not too difficult; not sure if it's worth the effort though - reuse the kvm dirty bitmap Not too difficult but introduces tight coupling between vhost and kvm which might slow down development - drop to userspace for live migration Reuse qemu code, lose some performance -- error compiling committee.c: too many arguments to function _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
