diff options
Diffstat (limited to 'dump.c')
| -rw-r--r-- | dump.c | 142 |
1 files changed, 61 insertions, 81 deletions
diff --git a/dump.c b/dump.c index e56b7cfc25..97d2c8dcef 100644 --- a/dump.c +++ b/dump.c @@ -90,8 +90,6 @@ typedef struct DumpState { uint8_t *note_buf; /* buffer for notes */ size_t note_buf_offset; /* the writing place in note_buf */ uint32_t nr_cpus; /* number of guest's cpu */ - size_t page_size; /* guest's page size */ - uint32_t page_shift; /* guest's page shift */ uint64_t max_mapnr; /* the biggest guest's phys-mem's number */ size_t len_dump_bitmap; /* the size of the place used to store dump_bitmap in vmcore */ @@ -711,27 +709,25 @@ static int create_vmcore(DumpState *s) static int write_start_flat_header(int fd) { - uint8_t *buf; - MakedumpfileHeader mh; + MakedumpfileHeader *mh; int ret = 0; - memset(&mh, 0, sizeof(mh)); - strncpy(mh.signature, MAKEDUMPFILE_SIGNATURE, - strlen(MAKEDUMPFILE_SIGNATURE)); + QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER); + mh = g_malloc0(MAX_SIZE_MDF_HEADER); - mh.type = cpu_to_be64(TYPE_FLAT_HEADER); - mh.version = cpu_to_be64(VERSION_FLAT_HEADER); + memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE, + MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE)); - buf = g_malloc0(MAX_SIZE_MDF_HEADER); - memcpy(buf, &mh, sizeof(mh)); + mh->type = cpu_to_be64(TYPE_FLAT_HEADER); + mh->version = cpu_to_be64(VERSION_FLAT_HEADER); size_t written_size; - written_size = qemu_write_full(fd, buf, MAX_SIZE_MDF_HEADER); + written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER); if (written_size != MAX_SIZE_MDF_HEADER) { ret = -1; } - g_free(buf); + g_free(mh); return ret; } @@ -808,7 +804,7 @@ static int create_header32(DumpState *s) strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE)); dh->header_version = cpu_convert_to_target32(6, endian); - block_size = s->page_size; + block_size = TARGET_PAGE_SIZE; dh->block_size = cpu_convert_to_target32(block_size, endian); sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size; sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); @@ -915,7 +911,7 @@ static int create_header64(DumpState *s) strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE)); dh->header_version = cpu_convert_to_target32(6, endian); - block_size = s->page_size; + block_size = TARGET_PAGE_SIZE; dh->block_size = cpu_convert_to_target32(block_size, endian); sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size; sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); @@ -1004,7 +1000,7 @@ out: static int write_dump_header(DumpState *s) { - if (s->dump_info.d_machine == EM_386) { + if (s->dump_info.d_class == ELFCLASS32) { return create_header32(s); } else { return create_header64(s); @@ -1086,9 +1082,9 @@ static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, if (!block) { block = QTAILQ_FIRST(&s->guest_phys_blocks.head); *blockptr = block; - assert(block->target_start % s->page_size == 0); - assert(block->target_end % s->page_size == 0); - *pfnptr = paddr_to_pfn(block->target_start, s->page_shift); + assert((block->target_start & ~TARGET_PAGE_MASK) == 0); + assert((block->target_end & ~TARGET_PAGE_MASK) == 0); + *pfnptr = paddr_to_pfn(block->target_start); if (bufptr) { *bufptr = block->host_addr; } @@ -1096,10 +1092,10 @@ static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, } *pfnptr = *pfnptr + 1; - addr = pfn_to_paddr(*pfnptr, s->page_shift); + addr = pfn_to_paddr(*pfnptr); if ((addr >= block->target_start) && - (addr + s->page_size <= block->target_end)) { + (addr + TARGET_PAGE_SIZE <= block->target_end)) { buf = block->host_addr + (addr - block->target_start); } else { /* the next page is in the next block */ @@ -1108,9 +1104,9 @@ static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, if (!block) { return false; } - assert(block->target_start % s->page_size == 0); - assert(block->target_end % s->page_size == 0); - *pfnptr = paddr_to_pfn(block->target_start, s->page_shift); + assert((block->target_start & ~TARGET_PAGE_MASK) == 0); + assert((block->target_end & ~TARGET_PAGE_MASK) == 0); + *pfnptr = paddr_to_pfn(block->target_start); buf = block->host_addr; } @@ -1224,42 +1220,24 @@ static void free_data_cache(DataCache *data_cache) static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress) { - size_t len_buf_out_zlib, len_buf_out_lzo, len_buf_out_snappy; - size_t len_buf_out; - - /* init buf_out */ - len_buf_out_zlib = len_buf_out_lzo = len_buf_out_snappy = 0; - - /* buf size for zlib */ - len_buf_out_zlib = compressBound(page_size); - - /* buf size for lzo */ -#ifdef CONFIG_LZO - if (flag_compress & DUMP_DH_COMPRESSED_LZO) { - if (lzo_init() != LZO_E_OK) { - /* return 0 to indicate lzo is unavailable */ - return 0; - } - } - - /* - * LZO will expand incompressible data by a little amount. please check the - * following URL to see the expansion calculation: - * http://www.oberhumer.com/opensource/lzo/lzofaq.php - */ - len_buf_out_lzo = page_size + page_size / 16 + 64 + 3; -#endif + switch (flag_compress) { + case DUMP_DH_COMPRESSED_ZLIB: + return compressBound(page_size); + + case DUMP_DH_COMPRESSED_LZO: + /* + * LZO will expand incompressible data by a little amount. Please check + * the following URL to see the expansion calculation: + * http://www.oberhumer.com/opensource/lzo/lzofaq.php + */ + return page_size + page_size / 16 + 64 + 3; #ifdef CONFIG_SNAPPY - /* buf size for snappy */ - len_buf_out_snappy = snappy_max_compressed_length(page_size); + case DUMP_DH_COMPRESSED_SNAPPY: + return snappy_max_compressed_length(page_size); #endif - - /* get the biggest that can store all kinds of compressed page */ - len_buf_out = MAX(len_buf_out_zlib, - MAX(len_buf_out_lzo, len_buf_out_snappy)); - - return len_buf_out; + } + return 0; } /* @@ -1294,11 +1272,8 @@ static int write_dump_pages(DumpState *s) prepare_data_cache(&page_data, s, offset_data); /* prepare buffer to store compressed data */ - len_buf_out = get_len_buf_out(s->page_size, s->flag_compress); - if (len_buf_out == 0) { - dump_error(s, "dump: failed to get length of output buffer.\n"); - goto out; - } + len_buf_out = get_len_buf_out(TARGET_PAGE_SIZE, s->flag_compress); + assert(len_buf_out != 0); #ifdef CONFIG_LZO wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); @@ -1310,19 +1285,19 @@ static int write_dump_pages(DumpState *s) * init zero page's page_desc and page_data, because every zero page * uses the same page_data */ - pd_zero.size = cpu_convert_to_target32(s->page_size, endian); + pd_zero.size = cpu_convert_to_target32(TARGET_PAGE_SIZE, endian); pd_zero.flags = cpu_convert_to_target32(0, endian); pd_zero.offset = cpu_convert_to_target64(offset_data, endian); pd_zero.page_flags = cpu_convert_to_target64(0, endian); - buf = g_malloc0(s->page_size); - ret = write_cache(&page_data, buf, s->page_size, false); + buf = g_malloc0(TARGET_PAGE_SIZE); + ret = write_cache(&page_data, buf, TARGET_PAGE_SIZE, false); g_free(buf); if (ret < 0) { dump_error(s, "dump: failed to write page data(zero page).\n"); goto out; } - offset_data += s->page_size; + offset_data += TARGET_PAGE_SIZE; /* * dump memory to vmcore page by page. zero page will all be resided in the @@ -1330,7 +1305,7 @@ static int write_dump_pages(DumpState *s) */ while (get_next_page(&block_iter, &pfn_iter, &buf, s)) { /* check zero page */ - if (is_zero_page(buf, s->page_size)) { + if (is_zero_page(buf, TARGET_PAGE_SIZE)) { ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), false); if (ret < 0) { @@ -1351,8 +1326,9 @@ static int write_dump_pages(DumpState *s) */ size_out = len_buf_out; if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) && - (compress2(buf_out, (uLongf *)&size_out, buf, s->page_size, - Z_BEST_SPEED) == Z_OK) && (size_out < s->page_size)) { + (compress2(buf_out, (uLongf *)&size_out, buf, + TARGET_PAGE_SIZE, Z_BEST_SPEED) == Z_OK) && + (size_out < TARGET_PAGE_SIZE)) { pd.flags = cpu_convert_to_target32(DUMP_DH_COMPRESSED_ZLIB, endian); pd.size = cpu_convert_to_target32(size_out, endian); @@ -1364,9 +1340,9 @@ static int write_dump_pages(DumpState *s) } #ifdef CONFIG_LZO } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && - (lzo1x_1_compress(buf, s->page_size, buf_out, + (lzo1x_1_compress(buf, TARGET_PAGE_SIZE, buf_out, (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && - (size_out < s->page_size)) { + (size_out < TARGET_PAGE_SIZE)) { pd.flags = cpu_convert_to_target32(DUMP_DH_COMPRESSED_LZO, endian); pd.size = cpu_convert_to_target32(size_out, endian); @@ -1379,9 +1355,9 @@ static int write_dump_pages(DumpState *s) #endif #ifdef CONFIG_SNAPPY } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && - (snappy_compress((char *)buf, s->page_size, + (snappy_compress((char *)buf, TARGET_PAGE_SIZE, (char *)buf_out, &size_out) == SNAPPY_OK) && - (size_out < s->page_size)) { + (size_out < TARGET_PAGE_SIZE)) { pd.flags = cpu_convert_to_target32( DUMP_DH_COMPRESSED_SNAPPY, endian); pd.size = cpu_convert_to_target32(size_out, endian); @@ -1395,13 +1371,13 @@ static int write_dump_pages(DumpState *s) } else { /* * fall back to save in plaintext, size_out should be - * assigned to s->page_size + * assigned TARGET_PAGE_SIZE */ pd.flags = cpu_convert_to_target32(0, endian); - size_out = s->page_size; + size_out = TARGET_PAGE_SIZE; pd.size = cpu_convert_to_target32(size_out, endian); - ret = write_cache(&page_data, buf, s->page_size, false); + ret = write_cache(&page_data, buf, TARGET_PAGE_SIZE, false); if (ret < 0) { dump_error(s, "dump: failed to write page data.\n"); goto out; @@ -1536,7 +1512,7 @@ static void get_max_mapnr(DumpState *s) GuestPhysBlock *last_block; last_block = QTAILQ_LAST(&s->guest_phys_blocks.head, GuestPhysBlockHead); - s->max_mapnr = paddr_to_pfn(last_block->target_end, s->page_shift); + s->max_mapnr = paddr_to_pfn(last_block->target_end); } static int dump_init(DumpState *s, int fd, bool has_format, @@ -1613,14 +1589,12 @@ static int dump_init(DumpState *s, int fd, bool has_format, } s->nr_cpus = nr_cpus; - s->page_size = TARGET_PAGE_SIZE; - s->page_shift = ffs(s->page_size) - 1; get_max_mapnr(s); uint64_t tmp; - tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), s->page_size); - s->len_dump_bitmap = tmp * s->page_size; + tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), TARGET_PAGE_SIZE); + s->len_dump_bitmap = tmp * TARGET_PAGE_SIZE; /* init for kdump-compressed format */ if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { @@ -1630,6 +1604,12 @@ static int dump_init(DumpState *s, int fd, bool has_format, break; case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO: +#ifdef CONFIG_LZO + if (lzo_init() != LZO_E_OK) { + error_setg(errp, "failed to initialize the LZO library"); + goto cleanup; + } +#endif s->flag_compress = DUMP_DH_COMPRESSED_LZO; break; |