From e8f3735fa3aa457303534121794b0452d22d440f Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Mon, 3 Sep 2018 17:26:44 +0800 Subject: migration: handle the error condition properly ram_find_and_save_block() can return negative if any error hanppens, however, it is completely ignored in current code Signed-off-by: Xiao Guangrong Reviewed-by: Juan Quintela Message-Id: <20180903092644.25812-5-xiaoguangrong@tencent.com> Signed-off-by: Juan Quintela Signed-off-by: Dr. David Alan Gilbert --- migration/ram.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) (limited to 'migration/ram.c') diff --git a/migration/ram.c b/migration/ram.c index 0423ef0f..43360f6 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2372,7 +2372,8 @@ static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss, * * Called within an RCU critical section. * - * Returns the number of pages written where zero means no dirty pages + * Returns the number of pages written where zero means no dirty pages, + * or negative on error * * @rs: current RAM state * @last_stage: if we are at the completion stage @@ -3196,6 +3197,12 @@ static int ram_save_iterate(QEMUFile *f, void *opaque) done = 1; break; } + + if (pages < 0) { + qemu_file_set_error(f, pages); + break; + } + rs->target_page_count += pages; /* we want to check in the 1st loop, just in case it was the 1st time @@ -3238,7 +3245,7 @@ out: /** * ram_save_complete: function called to send the remaining amount of ram * - * Returns zero to indicate success + * Returns zero to indicate success or negative on error * * Called with iothread lock * @@ -3249,6 +3256,7 @@ static int ram_save_complete(QEMUFile *f, void *opaque) { RAMState **temp = opaque; RAMState *rs = *temp; + int ret = 0; rcu_read_lock(); @@ -3269,6 +3277,10 @@ static int ram_save_complete(QEMUFile *f, void *opaque) if (pages == 0) { break; } + if (pages < 0) { + ret = pages; + break; + } } flush_compressed_data(rs); @@ -3280,7 +3292,7 @@ static int ram_save_complete(QEMUFile *f, void *opaque) qemu_put_be64(f, RAM_SAVE_FLAG_EOS); qemu_fflush(f); - return 0; + return ret; } static void ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size, -- cgit v1.1