diff options
Diffstat (limited to 'dump.c')
| -rw-r--r-- | dump.c | 215 |
1 files changed, 160 insertions, 55 deletions
@@ -25,6 +25,7 @@ #include "sysemu/cpus.h" #include "qapi/qmp/qerror.h" #include "qmp-commands.h" +#include "qapi-event.h" #include <zlib.h> #ifdef CONFIG_LZO @@ -82,12 +83,6 @@ static int dump_cleanup(DumpState *s) return 0; } -static void dump_error(DumpState *s, const char *reason, Error **errp) -{ - dump_cleanup(s); - error_setg(errp, "%s", reason); -} - static int fd_write_vmcore(const void *buf, size_t size, void *opaque) { DumpState *s = opaque; @@ -128,7 +123,7 @@ static void write_elf64_header(DumpState *s, Error **errp) ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); if (ret < 0) { - dump_error(s, "dump: failed to write elf header", errp); + error_setg(errp, "dump: failed to write elf header"); } } @@ -159,7 +154,7 @@ static void write_elf32_header(DumpState *s, Error **errp) ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); if (ret < 0) { - dump_error(s, "dump: failed to write elf header", errp); + error_setg(errp, "dump: failed to write elf header"); } } @@ -182,7 +177,7 @@ static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); if (ret < 0) { - dump_error(s, "dump: failed to write program header table", errp); + error_setg(errp, "dump: failed to write program header table"); } } @@ -205,7 +200,7 @@ static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); if (ret < 0) { - dump_error(s, "dump: failed to write program header table", errp); + error_setg(errp, "dump: failed to write program header table"); } } @@ -225,7 +220,7 @@ static void write_elf64_note(DumpState *s, Error **errp) ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); if (ret < 0) { - dump_error(s, "dump: failed to write program header table", errp); + error_setg(errp, "dump: failed to write program header table"); } } @@ -245,7 +240,7 @@ static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, id = cpu_index(cpu); ret = cpu_write_elf64_note(f, cpu, id, s); if (ret < 0) { - dump_error(s, "dump: failed to write elf notes", errp); + error_setg(errp, "dump: failed to write elf notes"); return; } } @@ -253,7 +248,7 @@ static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, CPU_FOREACH(cpu) { ret = cpu_write_elf64_qemunote(f, cpu, s); if (ret < 0) { - dump_error(s, "dump: failed to write CPU status", errp); + error_setg(errp, "dump: failed to write CPU status"); return; } } @@ -275,7 +270,7 @@ static void write_elf32_note(DumpState *s, Error **errp) ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); if (ret < 0) { - dump_error(s, "dump: failed to write program header table", errp); + error_setg(errp, "dump: failed to write program header table"); } } @@ -290,7 +285,7 @@ static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, id = cpu_index(cpu); ret = cpu_write_elf32_note(f, cpu, id, s); if (ret < 0) { - dump_error(s, "dump: failed to write elf notes", errp); + error_setg(errp, "dump: failed to write elf notes"); return; } } @@ -298,7 +293,7 @@ static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, CPU_FOREACH(cpu) { ret = cpu_write_elf32_qemunote(f, cpu, s); if (ret < 0) { - dump_error(s, "dump: failed to write CPU status", errp); + error_setg(errp, "dump: failed to write CPU status"); return; } } @@ -326,7 +321,7 @@ static void write_elf_section(DumpState *s, int type, Error **errp) ret = fd_write_vmcore(&shdr, shdr_size, s); if (ret < 0) { - dump_error(s, "dump: failed to write section header table", errp); + error_setg(errp, "dump: failed to write section header table"); } } @@ -336,7 +331,9 @@ static void write_data(DumpState *s, void *buf, int length, Error **errp) ret = fd_write_vmcore(buf, length, s); if (ret < 0) { - dump_error(s, "dump: failed to save memory", errp); + error_setg(errp, "dump: failed to save memory"); + } else { + s->written_size += length; } } @@ -568,11 +565,6 @@ static void dump_begin(DumpState *s, Error **errp) } } -static void dump_completed(DumpState *s) -{ - dump_cleanup(s); -} - static int get_next_block(DumpState *s, GuestPhysBlock *block) { while (1) { @@ -624,8 +616,6 @@ static void dump_iterate(DumpState *s, Error **errp) } } while (!get_next_block(s, block)); - - dump_completed(s); } static void create_vmcore(DumpState *s, Error **errp) @@ -765,7 +755,7 @@ static void create_header32(DumpState *s, Error **errp) dh->status = cpu_to_dump32(s, status); if (write_buffer(s->fd, 0, dh, size) < 0) { - dump_error(s, "dump: failed to write disk dump header", errp); + error_setg(errp, "dump: failed to write disk dump header"); goto out; } @@ -784,7 +774,7 @@ static void create_header32(DumpState *s, Error **errp) if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * block_size, kh, size) < 0) { - dump_error(s, "dump: failed to write kdump sub header", errp); + error_setg(errp, "dump: failed to write kdump sub header"); goto out; } @@ -800,7 +790,7 @@ static void create_header32(DumpState *s, Error **errp) } if (write_buffer(s->fd, offset_note, s->note_buf, s->note_size) < 0) { - dump_error(s, "dump: failed to write notes", errp); + error_setg(errp, "dump: failed to write notes"); goto out; } @@ -865,7 +855,7 @@ static void create_header64(DumpState *s, Error **errp) dh->status = cpu_to_dump32(s, status); if (write_buffer(s->fd, 0, dh, size) < 0) { - dump_error(s, "dump: failed to write disk dump header", errp); + error_setg(errp, "dump: failed to write disk dump header"); goto out; } @@ -884,7 +874,7 @@ static void create_header64(DumpState *s, Error **errp) if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * block_size, kh, size) < 0) { - dump_error(s, "dump: failed to write kdump sub header", errp); + error_setg(errp, "dump: failed to write kdump sub header"); goto out; } @@ -901,7 +891,7 @@ static void create_header64(DumpState *s, Error **errp) if (write_buffer(s->fd, offset_note, s->note_buf, s->note_size) < 0) { - dump_error(s, "dump: failed to write notes", errp); + error_setg(errp, "dump: failed to write notes"); goto out; } @@ -1087,7 +1077,7 @@ static void write_dump_bitmap(DumpState *s, Error **errp) while (get_next_page(&block_iter, &pfn, NULL, s)) { ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s); if (ret < 0) { - dump_error(s, "dump: failed to set dump_bitmap", errp); + error_setg(errp, "dump: failed to set dump_bitmap"); goto out; } @@ -1104,7 +1094,7 @@ static void write_dump_bitmap(DumpState *s, Error **errp) ret = set_dump_bitmap(last_pfn, last_pfn + bits_per_buf, false, dump_bitmap_buf, s); if (ret < 0) { - dump_error(s, "dump: failed to sync dump_bitmap", errp); + error_setg(errp, "dump: failed to sync dump_bitmap"); goto out; } } @@ -1237,7 +1227,7 @@ static void write_dump_pages(DumpState *s, Error **errp) ret = write_cache(&page_data, buf, s->dump_info.page_size, false); g_free(buf); if (ret < 0) { - dump_error(s, "dump: failed to write page data (zero page)", errp); + error_setg(errp, "dump: failed to write page data (zero page)"); goto out; } @@ -1253,7 +1243,7 @@ static void write_dump_pages(DumpState *s, Error **errp) ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), false); if (ret < 0) { - dump_error(s, "dump: failed to write page desc", errp); + error_setg(errp, "dump: failed to write page desc"); goto out; } } else { @@ -1278,7 +1268,7 @@ static void write_dump_pages(DumpState *s, Error **errp) ret = write_cache(&page_data, buf_out, size_out, false); if (ret < 0) { - dump_error(s, "dump: failed to write page data", errp); + error_setg(errp, "dump: failed to write page data"); goto out; } #ifdef CONFIG_LZO @@ -1291,7 +1281,7 @@ static void write_dump_pages(DumpState *s, Error **errp) ret = write_cache(&page_data, buf_out, size_out, false); if (ret < 0) { - dump_error(s, "dump: failed to write page data", errp); + error_setg(errp, "dump: failed to write page data"); goto out; } #endif @@ -1305,7 +1295,7 @@ static void write_dump_pages(DumpState *s, Error **errp) ret = write_cache(&page_data, buf_out, size_out, false); if (ret < 0) { - dump_error(s, "dump: failed to write page data", errp); + error_setg(errp, "dump: failed to write page data"); goto out; } #endif @@ -1321,7 +1311,7 @@ static void write_dump_pages(DumpState *s, Error **errp) ret = write_cache(&page_data, buf, s->dump_info.page_size, false); if (ret < 0) { - dump_error(s, "dump: failed to write page data", errp); + error_setg(errp, "dump: failed to write page data"); goto out; } } @@ -1333,20 +1323,21 @@ static void write_dump_pages(DumpState *s, Error **errp) ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); if (ret < 0) { - dump_error(s, "dump: failed to write page desc", errp); + error_setg(errp, "dump: failed to write page desc"); goto out; } } + s->written_size += s->dump_info.page_size; } ret = write_cache(&page_desc, NULL, 0, true); if (ret < 0) { - dump_error(s, "dump: failed to sync cache for page_desc", errp); + error_setg(errp, "dump: failed to sync cache for page_desc"); goto out; } ret = write_cache(&page_data, NULL, 0, true); if (ret < 0) { - dump_error(s, "dump: failed to sync cache for page_data", errp); + error_setg(errp, "dump: failed to sync cache for page_data"); goto out; } @@ -1390,7 +1381,7 @@ static void create_kdump_vmcore(DumpState *s, Error **errp) ret = write_start_flat_header(s->fd); if (ret < 0) { - dump_error(s, "dump: failed to write start flat header", errp); + error_setg(errp, "dump: failed to write start flat header"); return; } @@ -1414,11 +1405,9 @@ static void create_kdump_vmcore(DumpState *s, Error **errp) ret = write_end_flat_header(s->fd); if (ret < 0) { - dump_error(s, "dump: failed to write end flat header", errp); + error_setg(errp, "dump: failed to write end flat header"); return; } - - dump_completed(s); } static ram_addr_t get_start_block(DumpState *s) @@ -1457,6 +1446,44 @@ static void get_max_mapnr(DumpState *s) s->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end); } +static DumpState dump_state_global = { .status = DUMP_STATUS_NONE }; + +static void dump_state_prepare(DumpState *s) +{ + /* zero the struct, setting status to active */ + *s = (DumpState) { .status = DUMP_STATUS_ACTIVE }; +} + +bool dump_in_progress(void) +{ + DumpState *state = &dump_state_global; + return (atomic_read(&state->status) == DUMP_STATUS_ACTIVE); +} + +/* calculate total size of memory to be dumped (taking filter into + * acoount.) */ +static int64_t dump_calculate_size(DumpState *s) +{ + GuestPhysBlock *block; + int64_t size = 0, total = 0, left = 0, right = 0; + + QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { + if (s->has_filter) { + /* calculate the overlapped region. */ + left = MAX(s->begin, block->target_start); + right = MIN(s->begin + s->length, block->target_end); + size = right - left; + size = size > 0 ? size : 0; + } else { + /* count the whole region in */ + size = (block->target_end - block->target_start); + } + total += size; + } + + return total; +} + static void dump_init(DumpState *s, int fd, bool has_format, DumpGuestMemoryFormat format, bool paging, bool has_filter, int64_t begin, int64_t length, Error **errp) @@ -1466,6 +1493,10 @@ static void dump_init(DumpState *s, int fd, bool has_format, Error *err = NULL; int ret; + s->has_format = has_format; + s->format = format; + s->written_size = 0; + /* kdump-compressed is conflict with paging and filter */ if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { assert(!paging && !has_filter); @@ -1496,6 +1527,10 @@ static void dump_init(DumpState *s, int fd, bool has_format, guest_phys_blocks_init(&s->guest_phys_blocks); guest_phys_blocks_append(&s->guest_phys_blocks); + s->total_size = dump_calculate_size(s); +#ifdef DEBUG_DUMP_GUEST_MEMORY + fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size); +#endif s->start = get_start_block(s); if (s->start == -1) { @@ -1624,8 +1659,60 @@ cleanup: dump_cleanup(s); } -void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin, - int64_t begin, bool has_length, +/* this operation might be time consuming. */ +static void dump_process(DumpState *s, Error **errp) +{ + Error *local_err = NULL; + DumpQueryResult *result = NULL; + + if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) { + create_kdump_vmcore(s, &local_err); + } else { + create_vmcore(s, &local_err); + } + + /* make sure status is written after written_size updates */ + smp_wmb(); + atomic_set(&s->status, + (local_err ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED)); + + /* send DUMP_COMPLETED message (unconditionally) */ + result = qmp_query_dump(NULL); + /* should never fail */ + assert(result); + qapi_event_send_dump_completed(result, !!local_err, (local_err ? \ + error_get_pretty(local_err) : NULL), + &error_abort); + qapi_free_DumpQueryResult(result); + + error_propagate(errp, local_err); + dump_cleanup(s); +} + +static void *dump_thread(void *data) +{ + Error *err = NULL; + DumpState *s = (DumpState *)data; + dump_process(s, &err); + error_free(err); + return NULL; +} + +DumpQueryResult *qmp_query_dump(Error **errp) +{ + DumpQueryResult *result = g_new(DumpQueryResult, 1); + DumpState *state = &dump_state_global; + result->status = atomic_read(&state->status); + /* make sure we are reading status and written_size in order */ + smp_rmb(); + result->completed = state->written_size; + result->total = state->total_size; + return result; +} + +void qmp_dump_guest_memory(bool paging, const char *file, + bool has_detach, bool detach, + bool has_begin, int64_t begin, bool has_length, int64_t length, bool has_format, DumpGuestMemoryFormat format, Error **errp) { @@ -1633,6 +1720,19 @@ void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin, int fd = -1; DumpState *s; Error *local_err = NULL; + bool detach_p = false; + + if (runstate_check(RUN_STATE_INMIGRATE)) { + error_setg(errp, "Dump not allowed during incoming migration."); + return; + } + + /* if there is a dump in background, we should wait until the dump + * finished */ + if (dump_in_progress()) { + error_setg(errp, "There is a dump in process, please wait."); + return; + } /* * kdump-compressed format need the whole memory dumped, so paging or @@ -1652,6 +1752,9 @@ void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin, error_setg(errp, QERR_MISSING_PARAMETER, "begin"); return; } + if (has_detach) { + detach_p = detach; + } /* check whether lzo/snappy is supported */ #ifndef CONFIG_LZO @@ -1690,23 +1793,25 @@ void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin, return; } - s = g_malloc0(sizeof(DumpState)); + s = &dump_state_global; + dump_state_prepare(s); dump_init(s, fd, has_format, format, paging, has_begin, begin, length, &local_err); if (local_err) { - g_free(s); error_propagate(errp, local_err); + atomic_set(&s->status, DUMP_STATUS_FAILED); return; } - if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { - create_kdump_vmcore(s, errp); + if (detach_p) { + /* detached dump */ + qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread, + s, QEMU_THREAD_DETACHED); } else { - create_vmcore(s, errp); + /* sync dump */ + dump_process(s, errp); } - - g_free(s); } DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) |