#include "qapi/error.h"
#include "qmp-commands.h"
-static uint16_t cpu_convert_to_target16(uint16_t val, int endian)
+#include <zlib.h>
+#ifdef CONFIG_LZO
+#include <lzo/lzo1x.h>
+#endif
+#ifdef CONFIG_SNAPPY
+#include <snappy-c.h>
+#endif
+#ifndef ELF_MACHINE_UNAME
+#define ELF_MACHINE_UNAME "Unknown"
+#endif
+
+uint16_t cpu_to_dump16(DumpState *s, uint16_t val)
{
- if (endian == ELFDATA2LSB) {
+ if (s->dump_info.d_endian == ELFDATA2LSB) {
val = cpu_to_le16(val);
} else {
val = cpu_to_be16(val);
return val;
}
-static uint32_t cpu_convert_to_target32(uint32_t val, int endian)
+uint32_t cpu_to_dump32(DumpState *s, uint32_t val)
{
- if (endian == ELFDATA2LSB) {
+ if (s->dump_info.d_endian == ELFDATA2LSB) {
val = cpu_to_le32(val);
} else {
val = cpu_to_be32(val);
return val;
}
-static uint64_t cpu_convert_to_target64(uint64_t val, int endian)
+uint64_t cpu_to_dump64(DumpState *s, uint64_t val)
{
- if (endian == ELFDATA2LSB) {
+ if (s->dump_info.d_endian == ELFDATA2LSB) {
val = cpu_to_le64(val);
} else {
val = cpu_to_be64(val);
return val;
}
-typedef struct DumpState {
- GuestPhysBlockList guest_phys_blocks;
- ArchDumpInfo dump_info;
- MemoryMappingList list;
- uint16_t phdr_num;
- uint32_t sh_info;
- bool have_section;
- bool resume;
- ssize_t note_size;
- hwaddr memory_offset;
- int fd;
-
- GuestPhysBlock *next_block;
- ram_addr_t start;
- bool has_filter;
- int64_t begin;
- int64_t length;
- Error **errp;
-
- 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 */
- off_t offset_dump_bitmap; /* offset of dump_bitmap part in vmcore */
- off_t offset_page; /* offset of page part in vmcore */
- size_t num_dumpable; /* number of page that can be dumped */
- uint32_t flag_compress; /* indicate the compression format */
-} DumpState;
-
static int dump_cleanup(DumpState *s)
{
- int ret = 0;
-
guest_phys_blocks_free(&s->guest_phys_blocks);
memory_mapping_list_free(&s->list);
- if (s->fd != -1) {
- close(s->fd);
- }
+ close(s->fd);
if (s->resume) {
vm_start();
}
- return ret;
+ return 0;
}
static void dump_error(DumpState *s, const char *reason)
{
Elf64_Ehdr elf_header;
int ret;
- int endian = s->dump_info.d_endian;
memset(&elf_header, 0, sizeof(Elf64_Ehdr));
memcpy(&elf_header, ELFMAG, SELFMAG);
elf_header.e_ident[EI_CLASS] = ELFCLASS64;
elf_header.e_ident[EI_DATA] = s->dump_info.d_endian;
elf_header.e_ident[EI_VERSION] = EV_CURRENT;
- elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian);
- elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine,
- endian);
- elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian);
- elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);
- elf_header.e_phoff = cpu_convert_to_target64(sizeof(Elf64_Ehdr), endian);
- elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf64_Phdr),
- endian);
- elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian);
+ elf_header.e_type = cpu_to_dump16(s, ET_CORE);
+ elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine);
+ elf_header.e_version = cpu_to_dump32(s, EV_CURRENT);
+ elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header));
+ elf_header.e_phoff = cpu_to_dump64(s, sizeof(Elf64_Ehdr));
+ elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr));
+ elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num);
if (s->have_section) {
uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info;
- elf_header.e_shoff = cpu_convert_to_target64(shoff, endian);
- elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf64_Shdr),
- endian);
- elf_header.e_shnum = cpu_convert_to_target16(1, endian);
+ elf_header.e_shoff = cpu_to_dump64(s, shoff);
+ elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr));
+ elf_header.e_shnum = cpu_to_dump16(s, 1);
}
ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
{
Elf32_Ehdr elf_header;
int ret;
- int endian = s->dump_info.d_endian;
memset(&elf_header, 0, sizeof(Elf32_Ehdr));
memcpy(&elf_header, ELFMAG, SELFMAG);
elf_header.e_ident[EI_CLASS] = ELFCLASS32;
- elf_header.e_ident[EI_DATA] = endian;
+ elf_header.e_ident[EI_DATA] = s->dump_info.d_endian;
elf_header.e_ident[EI_VERSION] = EV_CURRENT;
- elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian);
- elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine,
- endian);
- elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian);
- elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);
- elf_header.e_phoff = cpu_convert_to_target32(sizeof(Elf32_Ehdr), endian);
- elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf32_Phdr),
- endian);
- elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian);
+ elf_header.e_type = cpu_to_dump16(s, ET_CORE);
+ elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine);
+ elf_header.e_version = cpu_to_dump32(s, EV_CURRENT);
+ elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header));
+ elf_header.e_phoff = cpu_to_dump32(s, sizeof(Elf32_Ehdr));
+ elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr));
+ elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num);
if (s->have_section) {
uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info;
- elf_header.e_shoff = cpu_convert_to_target32(shoff, endian);
- elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf32_Shdr),
- endian);
- elf_header.e_shnum = cpu_convert_to_target16(1, endian);
+ elf_header.e_shoff = cpu_to_dump32(s, shoff);
+ elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr));
+ elf_header.e_shnum = cpu_to_dump16(s, 1);
}
ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
{
Elf64_Phdr phdr;
int ret;
- int endian = s->dump_info.d_endian;
memset(&phdr, 0, sizeof(Elf64_Phdr));
- phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian);
- phdr.p_offset = cpu_convert_to_target64(offset, endian);
- phdr.p_paddr = cpu_convert_to_target64(memory_mapping->phys_addr, endian);
- phdr.p_filesz = cpu_convert_to_target64(filesz, endian);
- phdr.p_memsz = cpu_convert_to_target64(memory_mapping->length, endian);
- phdr.p_vaddr = cpu_convert_to_target64(memory_mapping->virt_addr, endian);
+ phdr.p_type = cpu_to_dump32(s, PT_LOAD);
+ phdr.p_offset = cpu_to_dump64(s, offset);
+ phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr);
+ phdr.p_filesz = cpu_to_dump64(s, filesz);
+ phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length);
+ phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr);
assert(memory_mapping->length >= filesz);
{
Elf32_Phdr phdr;
int ret;
- int endian = s->dump_info.d_endian;
memset(&phdr, 0, sizeof(Elf32_Phdr));
- phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian);
- phdr.p_offset = cpu_convert_to_target32(offset, endian);
- phdr.p_paddr = cpu_convert_to_target32(memory_mapping->phys_addr, endian);
- phdr.p_filesz = cpu_convert_to_target32(filesz, endian);
- phdr.p_memsz = cpu_convert_to_target32(memory_mapping->length, endian);
- phdr.p_vaddr = cpu_convert_to_target32(memory_mapping->virt_addr, endian);
+ phdr.p_type = cpu_to_dump32(s, PT_LOAD);
+ phdr.p_offset = cpu_to_dump32(s, offset);
+ phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr);
+ phdr.p_filesz = cpu_to_dump32(s, filesz);
+ phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length);
+ phdr.p_vaddr = cpu_to_dump32(s, memory_mapping->virt_addr);
assert(memory_mapping->length >= filesz);
static int write_elf64_note(DumpState *s)
{
Elf64_Phdr phdr;
- int endian = s->dump_info.d_endian;
hwaddr begin = s->memory_offset - s->note_size;
int ret;
memset(&phdr, 0, sizeof(Elf64_Phdr));
- phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian);
- phdr.p_offset = cpu_convert_to_target64(begin, endian);
+ phdr.p_type = cpu_to_dump32(s, PT_NOTE);
+ phdr.p_offset = cpu_to_dump64(s, begin);
phdr.p_paddr = 0;
- phdr.p_filesz = cpu_convert_to_target64(s->note_size, endian);
- phdr.p_memsz = cpu_convert_to_target64(s->note_size, endian);
+ phdr.p_filesz = cpu_to_dump64(s, s->note_size);
+ phdr.p_memsz = cpu_to_dump64(s, s->note_size);
phdr.p_vaddr = 0;
ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
{
hwaddr begin = s->memory_offset - s->note_size;
Elf32_Phdr phdr;
- int endian = s->dump_info.d_endian;
int ret;
memset(&phdr, 0, sizeof(Elf32_Phdr));
- phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian);
- phdr.p_offset = cpu_convert_to_target32(begin, endian);
+ phdr.p_type = cpu_to_dump32(s, PT_NOTE);
+ phdr.p_offset = cpu_to_dump32(s, begin);
phdr.p_paddr = 0;
- phdr.p_filesz = cpu_convert_to_target32(s->note_size, endian);
- phdr.p_memsz = cpu_convert_to_target32(s->note_size, endian);
+ phdr.p_filesz = cpu_to_dump32(s, s->note_size);
+ phdr.p_memsz = cpu_to_dump32(s, s->note_size);
phdr.p_vaddr = 0;
ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
{
Elf32_Shdr shdr32;
Elf64_Shdr shdr64;
- int endian = s->dump_info.d_endian;
int shdr_size;
void *shdr;
int ret;
if (type == 0) {
shdr_size = sizeof(Elf32_Shdr);
memset(&shdr32, 0, shdr_size);
- shdr32.sh_info = cpu_convert_to_target32(s->sh_info, endian);
+ shdr32.sh_info = cpu_to_dump32(s, s->sh_info);
shdr = &shdr32;
} else {
shdr_size = sizeof(Elf64_Shdr);
memset(&shdr64, 0, shdr_size);
- shdr64.sh_info = cpu_convert_to_target32(s->sh_info, endian);
+ shdr64.sh_info = cpu_to_dump32(s, s->sh_info);
shdr = &shdr64;
}
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;
}
DiskDumpHeader32 *dh = NULL;
KdumpSubHeader32 *kh = NULL;
size_t size;
- int endian = s->dump_info.d_endian;
uint32_t block_size;
uint32_t sub_hdr_size;
uint32_t bitmap_blocks;
dh = g_malloc0(size);
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
- dh->header_version = cpu_convert_to_target32(6, endian);
- block_size = s->page_size;
- dh->block_size = cpu_convert_to_target32(block_size, endian);
+ dh->header_version = cpu_to_dump32(s, 6);
+ block_size = TARGET_PAGE_SIZE;
+ dh->block_size = cpu_to_dump32(s, block_size);
sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size;
sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
- dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian);
+ dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size);
/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
- dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX),
- endian);
- dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian);
+ dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX));
+ dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus);
bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
- dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian);
- memcpy(&(dh->utsname.machine), "i686", 4);
+ dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks);
+ strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine));
if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
status |= DUMP_DH_COMPRESSED_ZLIB;
status |= DUMP_DH_COMPRESSED_SNAPPY;
}
#endif
- dh->status = cpu_convert_to_target32(status, endian);
+ 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.\n");
kh = g_malloc0(size);
/* 64bit max_mapnr_64 */
- kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian);
- kh->phys_base = cpu_convert_to_target32(PHYS_BASE, endian);
- kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian);
+ kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr);
+ kh->phys_base = cpu_to_dump32(s, PHYS_BASE);
+ kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL);
offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
- kh->offset_note = cpu_convert_to_target64(offset_note, endian);
- kh->note_size = cpu_convert_to_target32(s->note_size, endian);
+ kh->offset_note = cpu_to_dump64(s, offset_note);
+ kh->note_size = cpu_to_dump32(s, s->note_size);
if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
block_size, kh, size) < 0) {
DiskDumpHeader64 *dh = NULL;
KdumpSubHeader64 *kh = NULL;
size_t size;
- int endian = s->dump_info.d_endian;
uint32_t block_size;
uint32_t sub_hdr_size;
uint32_t bitmap_blocks;
dh = g_malloc0(size);
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
- dh->header_version = cpu_convert_to_target32(6, endian);
- block_size = s->page_size;
- dh->block_size = cpu_convert_to_target32(block_size, endian);
+ dh->header_version = cpu_to_dump32(s, 6);
+ block_size = TARGET_PAGE_SIZE;
+ dh->block_size = cpu_to_dump32(s, block_size);
sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size;
sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
- dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian);
+ dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size);
/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
- dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX),
- endian);
- dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian);
+ dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX));
+ dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus);
bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
- dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian);
- memcpy(&(dh->utsname.machine), "x86_64", 6);
+ dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks);
+ strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine));
if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
status |= DUMP_DH_COMPRESSED_ZLIB;
status |= DUMP_DH_COMPRESSED_SNAPPY;
}
#endif
- dh->status = cpu_convert_to_target32(status, endian);
+ 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.\n");
kh = g_malloc0(size);
/* 64bit max_mapnr_64 */
- kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian);
- kh->phys_base = cpu_convert_to_target64(PHYS_BASE, endian);
- kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian);
+ kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr);
+ kh->phys_base = cpu_to_dump64(s, PHYS_BASE);
+ kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL);
offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
- kh->offset_note = cpu_convert_to_target64(offset_note, endian);
- kh->note_size = cpu_convert_to_target64(s->note_size, endian);
+ kh->offset_note = cpu_to_dump64(s, offset_note);
+ kh->note_size = cpu_to_dump64(s, s->note_size);
if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
block_size, kh, size) < 0) {
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);
}
}
+/*
+ * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be
+ * rewritten, so if need to set the first bit, set last_pfn and pfn to 0.
+ * set_dump_bitmap will always leave the recently set bit un-sync. And setting
+ * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into
+ * vmcore, ie. synchronizing un-sync bit into vmcore.
+ */
+static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value,
+ uint8_t *buf, DumpState *s)
+{
+ off_t old_offset, new_offset;
+ off_t offset_bitmap1, offset_bitmap2;
+ uint32_t byte, bit;
+
+ /* should not set the previous place */
+ assert(last_pfn <= pfn);
+
+ /*
+ * if the bit needed to be set is not cached in buf, flush the data in buf
+ * to vmcore firstly.
+ * making new_offset be bigger than old_offset can also sync remained data
+ * into vmcore.
+ */
+ old_offset = BUFSIZE_BITMAP * (last_pfn / PFN_BUFBITMAP);
+ new_offset = BUFSIZE_BITMAP * (pfn / PFN_BUFBITMAP);
+
+ while (old_offset < new_offset) {
+ /* calculate the offset and write dump_bitmap */
+ offset_bitmap1 = s->offset_dump_bitmap + old_offset;
+ if (write_buffer(s->fd, offset_bitmap1, buf,
+ BUFSIZE_BITMAP) < 0) {
+ return -1;
+ }
+
+ /* dump level 1 is chosen, so 1st and 2nd bitmap are same */
+ offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap +
+ old_offset;
+ if (write_buffer(s->fd, offset_bitmap2, buf,
+ BUFSIZE_BITMAP) < 0) {
+ return -1;
+ }
+
+ memset(buf, 0, BUFSIZE_BITMAP);
+ old_offset += BUFSIZE_BITMAP;
+ }
+
+ /* get the exact place of the bit in the buf, and set it */
+ byte = (pfn % PFN_BUFBITMAP) / CHAR_BIT;
+ bit = (pfn % PFN_BUFBITMAP) % CHAR_BIT;
+ if (value) {
+ buf[byte] |= 1u << bit;
+ } else {
+ buf[byte] &= ~(1u << bit);
+ }
+
+ return 0;
+}
+
+/*
+ * exam every page and return the page frame number and the address of the page.
+ * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys
+ * blocks, so block->target_start and block->target_end should be interal
+ * multiples of the target page size.
+ */
+static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
+ uint8_t **bufptr, DumpState *s)
+{
+ GuestPhysBlock *block = *blockptr;
+ hwaddr addr;
+ uint8_t *buf;
+
+ /* block == NULL means the start of the iteration */
+ if (!block) {
+ block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
+ *blockptr = block;
+ 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;
+ }
+ return true;
+ }
+
+ *pfnptr = *pfnptr + 1;
+ addr = pfn_to_paddr(*pfnptr);
+
+ if ((addr >= block->target_start) &&
+ (addr + TARGET_PAGE_SIZE <= block->target_end)) {
+ buf = block->host_addr + (addr - block->target_start);
+ } else {
+ /* the next page is in the next block */
+ block = QTAILQ_NEXT(block, next);
+ *blockptr = block;
+ if (!block) {
+ return false;
+ }
+ 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;
+ }
+
+ if (bufptr) {
+ *bufptr = buf;
+ }
+
+ return true;
+}
+
+static int write_dump_bitmap(DumpState *s)
+{
+ int ret = 0;
+ uint64_t last_pfn, pfn;
+ void *dump_bitmap_buf;
+ size_t num_dumpable;
+ GuestPhysBlock *block_iter = NULL;
+
+ /* dump_bitmap_buf is used to store dump_bitmap temporarily */
+ dump_bitmap_buf = g_malloc0(BUFSIZE_BITMAP);
+
+ num_dumpable = 0;
+ last_pfn = 0;
+
+ /*
+ * exam memory page by page, and set the bit in dump_bitmap corresponded
+ * to the existing page.
+ */
+ 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.\n");
+ ret = -1;
+ goto out;
+ }
+
+ last_pfn = pfn;
+ num_dumpable++;
+ }
+
+ /*
+ * set_dump_bitmap will always leave the recently set bit un-sync. Here we
+ * set last_pfn + PFN_BUFBITMAP to 0 and those set but un-sync bit will be
+ * synchronized into vmcore.
+ */
+ if (num_dumpable > 0) {
+ ret = set_dump_bitmap(last_pfn, last_pfn + PFN_BUFBITMAP, false,
+ dump_bitmap_buf, s);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to sync dump_bitmap.\n");
+ ret = -1;
+ goto out;
+ }
+ }
+
+ /* number of dumpable pages that will be dumped later */
+ s->num_dumpable = num_dumpable;
+
+out:
+ g_free(dump_bitmap_buf);
+
+ return ret;
+}
+
+static void prepare_data_cache(DataCache *data_cache, DumpState *s,
+ off_t offset)
+{
+ data_cache->fd = s->fd;
+ data_cache->data_size = 0;
+ data_cache->buf_size = BUFSIZE_DATA_CACHE;
+ data_cache->buf = g_malloc0(BUFSIZE_DATA_CACHE);
+ data_cache->offset = offset;
+}
+
+static int write_cache(DataCache *dc, const void *buf, size_t size,
+ bool flag_sync)
+{
+ /*
+ * dc->buf_size should not be less than size, otherwise dc will never be
+ * enough
+ */
+ assert(size <= dc->buf_size);
+
+ /*
+ * if flag_sync is set, synchronize data in dc->buf into vmcore.
+ * otherwise check if the space is enough for caching data in buf, if not,
+ * write the data in dc->buf to dc->fd and reset dc->buf
+ */
+ if ((!flag_sync && dc->data_size + size > dc->buf_size) ||
+ (flag_sync && dc->data_size > 0)) {
+ if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) {
+ return -1;
+ }
+
+ dc->offset += dc->data_size;
+ dc->data_size = 0;
+ }
+
+ if (!flag_sync) {
+ memcpy(dc->buf + dc->data_size, buf, size);
+ dc->data_size += size;
+ }
+
+ return 0;
+}
+
+static void free_data_cache(DataCache *data_cache)
+{
+ g_free(data_cache->buf);
+}
+
+static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress)
+{
+ 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
+ case DUMP_DH_COMPRESSED_SNAPPY:
+ return snappy_max_compressed_length(page_size);
+#endif
+ }
+ return 0;
+}
+
+/*
+ * check if the page is all 0
+ */
+static inline bool is_zero_page(const uint8_t *buf, size_t page_size)
+{
+ return buffer_is_zero(buf, page_size);
+}
+
+static int write_dump_pages(DumpState *s)
+{
+ int ret = 0;
+ DataCache page_desc, page_data;
+ size_t len_buf_out, size_out;
+#ifdef CONFIG_LZO
+ lzo_bytep wrkmem = NULL;
+#endif
+ uint8_t *buf_out = NULL;
+ off_t offset_desc, offset_data;
+ PageDescriptor pd, pd_zero;
+ uint8_t *buf;
+ GuestPhysBlock *block_iter = NULL;
+ uint64_t pfn_iter;
+
+ /* get offset of page_desc and page_data in dump file */
+ offset_desc = s->offset_page;
+ offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable;
+
+ prepare_data_cache(&page_desc, s, offset_desc);
+ prepare_data_cache(&page_data, s, offset_data);
+
+ /* prepare buffer to store compressed data */
+ 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);
+#endif
+
+ buf_out = g_malloc(len_buf_out);
+
+ /*
+ * init zero page's page_desc and page_data, because every zero page
+ * uses the same page_data
+ */
+ pd_zero.size = cpu_to_dump32(s, TARGET_PAGE_SIZE);
+ pd_zero.flags = cpu_to_dump32(s, 0);
+ pd_zero.offset = cpu_to_dump64(s, offset_data);
+ pd_zero.page_flags = cpu_to_dump64(s, 0);
+ 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 += TARGET_PAGE_SIZE;
+
+ /*
+ * dump memory to vmcore page by page. zero page will all be resided in the
+ * first page of page section
+ */
+ while (get_next_page(&block_iter, &pfn_iter, &buf, s)) {
+ /* check zero page */
+ if (is_zero_page(buf, TARGET_PAGE_SIZE)) {
+ ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor),
+ false);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to write page desc.\n");
+ goto out;
+ }
+ } else {
+ /*
+ * not zero page, then:
+ * 1. compress the page
+ * 2. write the compressed page into the cache of page_data
+ * 3. get page desc of the compressed page and write it into the
+ * cache of page_desc
+ *
+ * only one compression format will be used here, for
+ * s->flag_compress is set. But when compression fails to work,
+ * we fall back to save in plaintext.
+ */
+ size_out = len_buf_out;
+ if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) &&
+ (compress2(buf_out, (uLongf *)&size_out, buf,
+ TARGET_PAGE_SIZE, Z_BEST_SPEED) == Z_OK) &&
+ (size_out < TARGET_PAGE_SIZE)) {
+ pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB);
+ pd.size = cpu_to_dump32(s, size_out);
+
+ ret = write_cache(&page_data, buf_out, size_out, false);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to write page data.\n");
+ goto out;
+ }
+#ifdef CONFIG_LZO
+ } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) &&
+ (lzo1x_1_compress(buf, TARGET_PAGE_SIZE, buf_out,
+ (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) &&
+ (size_out < TARGET_PAGE_SIZE)) {
+ pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO);
+ pd.size = cpu_to_dump32(s, size_out);
+
+ ret = write_cache(&page_data, buf_out, size_out, false);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to write page data.\n");
+ goto out;
+ }
+#endif
+#ifdef CONFIG_SNAPPY
+ } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) &&
+ (snappy_compress((char *)buf, TARGET_PAGE_SIZE,
+ (char *)buf_out, &size_out) == SNAPPY_OK) &&
+ (size_out < TARGET_PAGE_SIZE)) {
+ pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY);
+ pd.size = cpu_to_dump32(s, size_out);
+
+ ret = write_cache(&page_data, buf_out, size_out, false);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to write page data.\n");
+ goto out;
+ }
+#endif
+ } else {
+ /*
+ * fall back to save in plaintext, size_out should be
+ * assigned TARGET_PAGE_SIZE
+ */
+ pd.flags = cpu_to_dump32(s, 0);
+ size_out = TARGET_PAGE_SIZE;
+ pd.size = cpu_to_dump32(s, size_out);
+
+ 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;
+ }
+ }
+
+ /* get and write page desc here */
+ pd.page_flags = cpu_to_dump64(s, 0);
+ pd.offset = cpu_to_dump64(s, offset_data);
+ offset_data += size_out;
+
+ ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to write page desc.\n");
+ goto out;
+ }
+ }
+ }
+
+ ret = write_cache(&page_desc, NULL, 0, true);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to sync cache for page_desc.\n");
+ goto out;
+ }
+ ret = write_cache(&page_data, NULL, 0, true);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to sync cache for page_data.\n");
+ goto out;
+ }
+
+out:
+ free_data_cache(&page_desc);
+ free_data_cache(&page_data);
+
+#ifdef CONFIG_LZO
+ g_free(wrkmem);
+#endif
+
+ g_free(buf_out);
+
+ return ret;
+}
+
+static int create_kdump_vmcore(DumpState *s)
+{
+ int ret;
+
+ /*
+ * the kdump-compressed format is:
+ * File offset
+ * +------------------------------------------+ 0x0
+ * | main header (struct disk_dump_header) |
+ * |------------------------------------------+ block 1
+ * | sub header (struct kdump_sub_header) |
+ * |------------------------------------------+ block 2
+ * | 1st-dump_bitmap |
+ * |------------------------------------------+ block 2 + X blocks
+ * | 2nd-dump_bitmap | (aligned by block)
+ * |------------------------------------------+ block 2 + 2 * X blocks
+ * | page desc for pfn 0 (struct page_desc) | (aligned by block)
+ * | page desc for pfn 1 (struct page_desc) |
+ * | : |
+ * |------------------------------------------| (not aligned by block)
+ * | page data (pfn 0) |
+ * | page data (pfn 1) |
+ * | : |
+ * +------------------------------------------+
+ */
+
+ ret = write_start_flat_header(s->fd);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to write start flat header.\n");
+ return -1;
+ }
+
+ ret = write_dump_header(s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ ret = write_dump_bitmap(s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ ret = write_dump_pages(s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ ret = write_end_flat_header(s->fd);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to write end flat header.\n");
+ return -1;
+ }
+
+ dump_completed(s);
+
+ return 0;
+}
+
static ram_addr_t get_start_block(DumpState *s)
{
GuestPhysBlock *block;
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 paging, bool has_filter,
+static int dump_init(DumpState *s, int fd, bool has_format,
+ DumpGuestMemoryFormat format, bool paging, bool has_filter,
int64_t begin, int64_t length, Error **errp)
{
CPUState *cpu;
Error *err = NULL;
int ret;
+ /* kdump-compressed is conflict with paging and filter */
+ if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
+ assert(!paging && !has_filter);
+ }
+
if (runstate_is_running()) {
vm_stop(RUN_STATE_SAVE_VM);
s->resume = true;
nr_cpus++;
}
- s->errp = errp;
s->fd = fd;
s->has_filter = has_filter;
s->begin = begin;
s->length = length;
+ memory_mapping_list_init(&s->list);
+
guest_phys_blocks_init(&s->guest_phys_blocks);
guest_phys_blocks_append(&s->guest_phys_blocks);
}
/* get memory mapping */
- memory_mapping_list_init(&s->list);
if (paging) {
qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err);
if (err != NULL) {
}
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) {
+ switch (format) {
+ case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB:
+ s->flag_compress = DUMP_DH_COMPRESSED_ZLIB;
+ 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;
+
+ case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY:
+ s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY;
+ break;
+
+ default:
+ s->flag_compress = 0;
+ }
+
+ return 0;
+ }
if (s->has_filter) {
memory_mapping_filter(&s->list, s->begin, s->length);
return 0;
cleanup:
- guest_phys_blocks_free(&s->guest_phys_blocks);
-
- if (s->resume) {
- vm_start();
- }
-
+ dump_cleanup(s);
return -1;
}
void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin,
- int64_t begin, bool has_length, int64_t length,
- Error **errp)
+ int64_t begin, bool has_length,
+ int64_t length, bool has_format,
+ DumpGuestMemoryFormat format, Error **errp)
{
const char *p;
int fd = -1;
DumpState *s;
int ret;
+ /*
+ * kdump-compressed format need the whole memory dumped, so paging or
+ * filter is not supported here.
+ */
+ if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) &&
+ (paging || has_begin || has_length)) {
+ error_setg(errp, "kdump-compressed format doesn't support paging or "
+ "filter");
+ return;
+ }
if (has_begin && !has_length) {
error_set(errp, QERR_MISSING_PARAMETER, "length");
return;
return;
}
+ /* check whether lzo/snappy is supported */
+#ifndef CONFIG_LZO
+ if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) {
+ error_setg(errp, "kdump-lzo is not available now");
+ return;
+ }
+#endif
+
+#ifndef CONFIG_SNAPPY
+ if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) {
+ error_setg(errp, "kdump-snappy is not available now");
+ return;
+ }
+#endif
+
#if !defined(WIN32)
if (strstart(file, "fd:", &p)) {
fd = monitor_get_fd(cur_mon, p, errp);
s = g_malloc0(sizeof(DumpState));
- ret = dump_init(s, fd, paging, has_begin, begin, length, errp);
+ ret = dump_init(s, fd, has_format, format, paging, has_begin,
+ begin, length, errp);
if (ret < 0) {
g_free(s);
return;
}
- if (create_vmcore(s) < 0 && !error_is_set(s->errp)) {
- error_set(errp, QERR_IO_ERROR);
+ if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
+ if (create_kdump_vmcore(s) < 0) {
+ error_set(errp, QERR_IO_ERROR);
+ }
+ } else {
+ if (create_vmcore(s) < 0) {
+ error_set(errp, QERR_IO_ERROR);
+ }
}
g_free(s);
}
+
+DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp)
+{
+ DumpGuestMemoryFormatList *item;
+ DumpGuestMemoryCapability *cap =
+ g_malloc0(sizeof(DumpGuestMemoryCapability));
+
+ /* elf is always available */
+ item = g_malloc0(sizeof(DumpGuestMemoryFormatList));
+ cap->formats = item;
+ item->value = DUMP_GUEST_MEMORY_FORMAT_ELF;
+
+ /* kdump-zlib is always available */
+ item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
+ item = item->next;
+ item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB;
+
+ /* add new item if kdump-lzo is available */
+#ifdef CONFIG_LZO
+ item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
+ item = item->next;
+ item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO;
+#endif
+
+ /* add new item if kdump-snappy is available */
+#ifdef CONFIG_SNAPPY
+ item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
+ item = item->next;
+ item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY;
+#endif
+
+ return cap;
+}
projects / qemu.git / blobdiff