Howdy, this series moves incoming migration to a coroutine, so that the monitor remains usable. I did this is as a step towards implementing an NBD server inside QEMU (which needs to configured and/or to serve requests during migration), but I think it is useful in general.
Coroutines work very simply by making the file descriptor non-blocking. On EAGAIN you call qemu_coroutine_yield(); when the file descriptor becomes readable, you call qemu_coroutine_enter(). This is mostly an RFC on the approach. Still, it mostly consists of cleanups and the first 3 patches could be applied right away. What needs some refinement is the hideous passing of file descriptors in patch 4 and especially the last patch. Paolo Bonzini (6): migration: clean up server sockets and handlers before invoking process_incoming_migration migration: close socket QEMUFile from socket_close migration: move qemu_fclose to process_incoming_migration migration: remove iohandlers before closing the file migration: handle EAGAIN while reading QEMUFile migration: move process_incoming_migration to a coroutine migration-exec.c | 3 +-- migration-fd.c | 3 +-- migration-tcp.c | 12 ++++++------ migration-unix.c | 12 ++++++------ migration.c | 23 +++++++++++++++++++++-- migration.h | 2 +- savevm.c | 34 ++++++++++++++++++++++++++++------ 7 file modificati, 64 inserzioni(+), 25 rimozioni(-) -- 1.7.11.2
