From 08614f34977a18fdc06c56f4e12b6cf47c06da57 Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Wed, 2 May 2018 18:47:33 +0800 Subject: migration: setup ramstate for resume After we updated the dirty bitmaps of ramblocks, we also need to update the critical fields in RAMState to make sure it is ready for a resume. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Peter Xu Message-Id: <20180502104740.12123-18-peterx@redhat.com> Signed-off-by: Juan Quintela --- migration/ram.c | 45 ++++++++++++++++++++++++++++++++++++++++++++- migration/trace-events | 1 + 2 files changed, 45 insertions(+), 1 deletion(-) diff --git a/migration/ram.c b/migration/ram.c index b16eabc..5bcbf7a 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2491,6 +2491,41 @@ static int ram_init_all(RAMState **rsp) return 0; } +static void ram_state_resume_prepare(RAMState *rs, QEMUFile *out) +{ + RAMBlock *block; + uint64_t pages = 0; + + /* + * Postcopy is not using xbzrle/compression, so no need for that. + * Also, since source are already halted, we don't need to care + * about dirty page logging as well. + */ + + RAMBLOCK_FOREACH(block) { + pages += bitmap_count_one(block->bmap, + block->used_length >> TARGET_PAGE_BITS); + } + + /* This may not be aligned with current bitmaps. Recalculate. */ + rs->migration_dirty_pages = pages; + + rs->last_seen_block = NULL; + rs->last_sent_block = NULL; + rs->last_page = 0; + rs->last_version = ram_list.version; + /* + * Disable the bulk stage, otherwise we'll resend the whole RAM no + * matter what we have sent. + */ + rs->ram_bulk_stage = false; + + /* Update RAMState cache of output QEMUFile */ + rs->f = out; + + trace_ram_state_resume_prepare(pages); +} + /* * Each of ram_save_setup, ram_save_iterate and ram_save_complete has * long-running RCU critical section. When rcu-reclaims in the code @@ -3486,8 +3521,16 @@ out: static int ram_resume_prepare(MigrationState *s, void *opaque) { RAMState *rs = *(RAMState **)opaque; + int ret; - return ram_dirty_bitmap_sync_all(s, rs); + ret = ram_dirty_bitmap_sync_all(s, rs); + if (ret) { + return ret; + } + + ram_state_resume_prepare(rs, s->to_dst_file); + + return 0; } static SaveVMHandlers savevm_ram_handlers = { diff --git a/migration/trace-events b/migration/trace-events index 53243e1..3c798dd 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -88,6 +88,7 @@ ram_dirty_bitmap_reload_complete(char *str) "%s" ram_dirty_bitmap_sync_start(void) "" ram_dirty_bitmap_sync_wait(void) "" ram_dirty_bitmap_sync_complete(void) "" +ram_state_resume_prepare(uint64_t v) "%" PRId64 # migration/migration.c await_return_path_close_on_source_close(void) "" -- cgit v1.1