From 763c906b0ee964e4b5c529a4ee171723339644cc Mon Sep 17 00:00:00 2001 From: "Dr. David Alan Gilbert" Date: Thu, 5 Nov 2015 18:11:00 +0000 Subject: Add qemu_savevm_state_complete_postcopy Add qemu_savevm_state_complete_postcopy to complement qemu_savevm_state_complete_precopy together with a new save_live_complete_postcopy method on devices. The save_live_complete_precopy method is called on all devices during a precopy migration, and all non-postcopy devices during a postcopy migration at the transition. The save_live_complete_postcopy method is called at the end of postcopy for all postcopiable devices. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Juan Quintela Reviewed-by: Amit Shah Signed-off-by: Juan Quintela --- migration/ram.c | 1 + migration/savevm.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 48 insertions(+), 2 deletions(-) (limited to 'migration') diff --git a/migration/ram.c b/migration/ram.c index 0e53325..4053ca1 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1704,6 +1704,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) static SaveVMHandlers savevm_ram_handlers = { .save_live_setup = ram_save_setup, .save_live_iterate = ram_save_iterate, + .save_live_complete_postcopy = ram_save_complete, .save_live_complete_precopy = ram_save_complete, .save_live_pending = ram_save_pending, .load_state = ram_load, diff --git a/migration/savevm.c b/migration/savevm.c index be61eb1..8e11877 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -978,19 +978,61 @@ static bool should_send_vmdesc(void) return !machine->suppress_vmdesc && !in_postcopy; } +/* + * Calls the save_live_complete_postcopy methods + * causing the last few pages to be sent immediately and doing any associated + * cleanup. + * Note postcopy also calls qemu_savevm_state_complete_precopy to complete + * all the other devices, but that happens at the point we switch to postcopy. + */ +void qemu_savevm_state_complete_postcopy(QEMUFile *f) +{ + SaveStateEntry *se; + int ret; + + QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { + if (!se->ops || !se->ops->save_live_complete_postcopy) { + continue; + } + if (se->ops && se->ops->is_active) { + if (!se->ops->is_active(se->opaque)) { + continue; + } + } + trace_savevm_section_start(se->idstr, se->section_id); + /* Section type */ + qemu_put_byte(f, QEMU_VM_SECTION_END); + qemu_put_be32(f, se->section_id); + + ret = se->ops->save_live_complete_postcopy(f, se->opaque); + trace_savevm_section_end(se->idstr, se->section_id, ret); + save_section_footer(f, se); + if (ret < 0) { + qemu_file_set_error(f, ret); + return; + } + } + + qemu_put_byte(f, QEMU_VM_EOF); + qemu_fflush(f); +} + void qemu_savevm_state_complete_precopy(QEMUFile *f) { QJSON *vmdesc; int vmdesc_len; SaveStateEntry *se; int ret; + bool in_postcopy = migration_in_postcopy(migrate_get_current()); trace_savevm_state_complete_precopy(); cpu_synchronize_all_states(); QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { - if (!se->ops || !se->ops->save_live_complete_precopy) { + if (!se->ops || + (in_postcopy && se->ops->save_live_complete_postcopy) || + !se->ops->save_live_complete_precopy) { continue; } if (se->ops && se->ops->is_active) { @@ -1039,7 +1081,10 @@ void qemu_savevm_state_complete_precopy(QEMUFile *f) save_section_footer(f, se); } - qemu_put_byte(f, QEMU_VM_EOF); + if (!in_postcopy) { + /* Postcopy stream will still be going */ + qemu_put_byte(f, QEMU_VM_EOF); + } json_end_array(vmdesc); qjson_finish(vmdesc); -- cgit v1.1