On 17/07/2015 02:19, Marc-André Lureau wrote: >>> >> How does vhost-user do this? I can see this patch providing enough >>> >> support for *non*live migration. However, it cannot be enough for live >>> >> migration unless I'm missing something obvious. >>> >> >>> >> Paolo >> > >> > Agree. vhost-user should mmap the log memory and mark dirty pages when send >> > or receive packets. > This is already supported by vhost-user protocol, isn't it? The > LOG_BASE/FD and vring log_guest_addr are provided. I can't find any > vhost-user backend implementing dirty bitmaps yet though, but it looks > like it should work. I suppose the backend should stop all IO after > RESET_OWNER is received.
But LOG_BASE makes little sense across processes, and LOG_FD is unused in QEMU, isn't it? So this patch is not enough to add support of live migration. Paolo
