diff options
Diffstat (limited to 'migration')
| -rw-r--r-- | migration/qemu-file.c | 4 | ||||
| -rw-r--r-- | migration/ram.c | 56 |
2 files changed, 41 insertions, 19 deletions
diff --git a/migration/qemu-file.c b/migration/qemu-file.c index bafe3a0c0d..0463f4c321 100644 --- a/migration/qemu-file.c +++ b/migration/qemu-file.c @@ -710,9 +710,9 @@ ssize_t qemu_put_compression_data(QEMUFile *f, z_stream *stream, blen = qemu_compress_data(stream, f->buf + f->buf_index + sizeof(int32_t), blen, p, size); if (blen < 0) { - error_report("Compress Failed!"); - return 0; + return -1; } + qemu_put_be32(f, blen); if (f->ops->writev_buffer) { add_to_iovec(f, f->buf + f->buf_index, blen, false); diff --git a/migration/ram.c b/migration/ram.c index fb24b2f32f..72cb8dfb66 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -269,7 +269,10 @@ struct CompressParam { QemuCond cond; RAMBlock *block; ram_addr_t offset; + + /* internally used fields */ z_stream stream; + uint8_t *originbuf; }; typedef struct CompressParam CompressParam; @@ -296,13 +299,14 @@ static QemuCond comp_done_cond; /* The empty QEMUFileOps will be used by file in CompressParam */ static const QEMUFileOps empty_ops = { }; +static QEMUFile *decomp_file; static DecompressParam *decomp_param; static QemuThread *decompress_threads; static QemuMutex decomp_done_lock; static QemuCond decomp_done_cond; static int do_compress_ram_page(QEMUFile *f, z_stream *stream, RAMBlock *block, - ram_addr_t offset); + ram_addr_t offset, uint8_t *source_buf); static void *do_data_compress(void *opaque) { @@ -318,7 +322,8 @@ static void *do_data_compress(void *opaque) param->block = NULL; qemu_mutex_unlock(¶m->mutex); - do_compress_ram_page(param->file, ¶m->stream, block, offset); + do_compress_ram_page(param->file, ¶m->stream, block, offset, + param->originbuf); qemu_mutex_lock(&comp_done_lock); param->done = true; @@ -370,6 +375,7 @@ static void compress_threads_save_cleanup(void) qemu_mutex_destroy(&comp_param[i].mutex); qemu_cond_destroy(&comp_param[i].cond); deflateEnd(&comp_param[i].stream); + g_free(comp_param[i].originbuf); qemu_fclose(comp_param[i].file); comp_param[i].file = NULL; } @@ -394,8 +400,14 @@ static int compress_threads_save_setup(void) qemu_cond_init(&comp_done_cond); qemu_mutex_init(&comp_done_lock); for (i = 0; i < thread_count; i++) { + comp_param[i].originbuf = g_try_malloc(TARGET_PAGE_SIZE); + if (!comp_param[i].originbuf) { + goto exit; + } + if (deflateInit(&comp_param[i].stream, migrate_compress_level()) != Z_OK) { + g_free(comp_param[i].originbuf); goto exit; } @@ -1053,7 +1065,7 @@ static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage) } static int do_compress_ram_page(QEMUFile *f, z_stream *stream, RAMBlock *block, - ram_addr_t offset) + ram_addr_t offset, uint8_t *source_buf) { RAMState *rs = ram_state; int bytes_sent, blen; @@ -1061,7 +1073,14 @@ static int do_compress_ram_page(QEMUFile *f, z_stream *stream, RAMBlock *block, bytes_sent = save_page_header(rs, f, block, offset | RAM_SAVE_FLAG_COMPRESS_PAGE); - blen = qemu_put_compression_data(f, stream, p, TARGET_PAGE_SIZE); + + /* + * copy it to a internal buffer to avoid it being modified by VM + * so that we can catch up the error during compression and + * decompression + */ + memcpy(source_buf, p, TARGET_PAGE_SIZE); + blen = qemu_put_compression_data(f, stream, source_buf, TARGET_PAGE_SIZE); if (blen < 0) { bytes_sent = 0; qemu_file_set_error(migrate_get_current()->to_dst_file, blen); @@ -2555,7 +2574,7 @@ static void *do_data_decompress(void *opaque) DecompressParam *param = opaque; unsigned long pagesize; uint8_t *des; - int len; + int len, ret; qemu_mutex_lock(¶m->mutex); while (!param->quit) { @@ -2566,13 +2585,13 @@ static void *do_data_decompress(void *opaque) qemu_mutex_unlock(¶m->mutex); pagesize = TARGET_PAGE_SIZE; - /* qemu_uncompress_data() will return failed in some case, - * especially when the page is dirtied when doing the compression, - * it's not a problem because the dirty page will be retransferred - * and uncompress() won't break the data in other pages. - */ - qemu_uncompress_data(¶m->stream, des, pagesize, param->compbuf, - len); + + ret = qemu_uncompress_data(¶m->stream, des, pagesize, + param->compbuf, len); + if (ret < 0) { + error_report("decompress data failed"); + qemu_file_set_error(decomp_file, ret); + } qemu_mutex_lock(&decomp_done_lock); param->done = true; @@ -2589,12 +2608,12 @@ static void *do_data_decompress(void *opaque) return NULL; } -static void wait_for_decompress_done(void) +static int wait_for_decompress_done(void) { int idx, thread_count; if (!migrate_use_compression()) { - return; + return 0; } thread_count = migrate_decompress_threads(); @@ -2605,6 +2624,7 @@ static void wait_for_decompress_done(void) } } qemu_mutex_unlock(&decomp_done_lock); + return qemu_file_get_error(decomp_file); } static void compress_threads_load_cleanup(void) @@ -2645,9 +2665,10 @@ static void compress_threads_load_cleanup(void) g_free(decomp_param); decompress_threads = NULL; decomp_param = NULL; + decomp_file = NULL; } -static int compress_threads_load_setup(void) +static int compress_threads_load_setup(QEMUFile *f) { int i, thread_count; @@ -2660,6 +2681,7 @@ static int compress_threads_load_setup(void) decomp_param = g_new0(DecompressParam, thread_count); qemu_mutex_init(&decomp_done_lock); qemu_cond_init(&decomp_done_cond); + decomp_file = f; for (i = 0; i < thread_count; i++) { if (inflateInit(&decomp_param[i].stream) != Z_OK) { goto exit; @@ -2719,7 +2741,7 @@ static void decompress_data_with_multi_threads(QEMUFile *f, */ static int ram_load_setup(QEMUFile *f, void *opaque) { - if (compress_threads_load_setup()) { + if (compress_threads_load_setup(f)) { return -1; } @@ -3074,7 +3096,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) } } - wait_for_decompress_done(); + ret |= wait_for_decompress_done(); rcu_read_unlock(); trace_ram_load_complete(ret, seq_iter); return ret; |