aboutsummaryrefslogtreecommitdiff
path: root/dump/dump.c
diff options
context:
space:
mode:
Diffstat (limited to 'dump/dump.c')
-rw-r--r--dump/dump.c361
1 files changed, 200 insertions, 161 deletions
diff --git a/dump/dump.c b/dump/dump.c
index 4d9658ffa2..236559b03a 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -59,6 +59,11 @@ static inline bool dump_is_64bit(DumpState *s)
return s->dump_info.d_class == ELFCLASS64;
}
+static inline bool dump_has_filter(DumpState *s)
+{
+ return s->filter_area_length > 0;
+}
+
uint16_t cpu_to_dump16(DumpState *s, uint16_t val)
{
if (s->dump_info.d_endian == ELFDATA2LSB) {
@@ -126,7 +131,7 @@ static int fd_write_vmcore(const void *buf, size_t size, void *opaque)
return 0;
}
-static void write_elf64_header(DumpState *s, Error **errp)
+static void prepare_elf64_header(DumpState *s, Elf64_Ehdr *elf_header)
{
/*
* phnum in the elf header is 16 bit, if we have more segments we
@@ -134,34 +139,27 @@ static void write_elf64_header(DumpState *s, Error **errp)
* special section.
*/
uint16_t phnum = MIN(s->phdr_num, PN_XNUM);
- Elf64_Ehdr elf_header;
- int ret;
- 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_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, s->phdr_offset);
- elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr));
- elf_header.e_phnum = cpu_to_dump16(s, phnum);
+ 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_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, s->phdr_offset);
+ elf_header->e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr));
+ elf_header->e_phnum = cpu_to_dump16(s, phnum);
if (s->shdr_num) {
- elf_header.e_shoff = cpu_to_dump64(s, s->shdr_offset);
- elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr));
- elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num);
- }
-
- ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
- if (ret < 0) {
- error_setg_errno(errp, -ret, "dump: failed to write elf header");
+ elf_header->e_shoff = cpu_to_dump64(s, s->shdr_offset);
+ elf_header->e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr));
+ elf_header->e_shnum = cpu_to_dump16(s, s->shdr_num);
}
}
-static void write_elf32_header(DumpState *s, Error **errp)
+static void prepare_elf32_header(DumpState *s, Elf32_Ehdr *elf_header)
{
/*
* phnum in the elf header is 16 bit, if we have more segments we
@@ -169,28 +167,45 @@ static void write_elf32_header(DumpState *s, Error **errp)
* special section.
*/
uint16_t phnum = MIN(s->phdr_num, PN_XNUM);
- Elf32_Ehdr elf_header;
- int ret;
- 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] = s->dump_info.d_endian;
- elf_header.e_ident[EI_VERSION] = EV_CURRENT;
- 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, s->phdr_offset);
- elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr));
- elf_header.e_phnum = cpu_to_dump16(s, phnum);
+ 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] = s->dump_info.d_endian;
+ elf_header->e_ident[EI_VERSION] = EV_CURRENT;
+ 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, s->phdr_offset);
+ elf_header->e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr));
+ elf_header->e_phnum = cpu_to_dump16(s, phnum);
if (s->shdr_num) {
- elf_header.e_shoff = cpu_to_dump32(s, s->shdr_offset);
- elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr));
- elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num);
+ elf_header->e_shoff = cpu_to_dump32(s, s->shdr_offset);
+ elf_header->e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr));
+ elf_header->e_shnum = cpu_to_dump16(s, s->shdr_num);
}
+}
- ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
+static void write_elf_header(DumpState *s, Error **errp)
+{
+ Elf32_Ehdr elf32_header;
+ Elf64_Ehdr elf64_header;
+ size_t header_size;
+ void *header_ptr;
+ int ret;
+
+ if (dump_is_64bit(s)) {
+ prepare_elf64_header(s, &elf64_header);
+ header_size = sizeof(elf64_header);
+ header_ptr = &elf64_header;
+ } else {
+ prepare_elf32_header(s, &elf32_header);
+ header_size = sizeof(elf32_header);
+ header_ptr = &elf32_header;
+ }
+
+ ret = fd_write_vmcore(header_ptr, header_size, s);
if (ret < 0) {
error_setg_errno(errp, -ret, "dump: failed to write elf header");
}
@@ -245,7 +260,7 @@ static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping,
}
}
-static void write_elf64_phdr_note(DumpState *s, Elf64_Phdr *phdr)
+static void prepare_elf64_phdr_note(DumpState *s, Elf64_Phdr *phdr)
{
memset(phdr, 0, sizeof(*phdr));
phdr->p_type = cpu_to_dump32(s, PT_NOTE);
@@ -301,7 +316,7 @@ static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s,
write_guest_note(f, s, errp);
}
-static void write_elf32_phdr_note(DumpState *s, Elf32_Phdr *phdr)
+static void prepare_elf32_phdr_note(DumpState *s, Elf32_Phdr *phdr)
{
memset(phdr, 0, sizeof(*phdr));
phdr->p_type = cpu_to_dump32(s, PT_NOTE);
@@ -349,11 +364,11 @@ static void write_elf_phdr_note(DumpState *s, Error **errp)
int ret;
if (dump_is_64bit(s)) {
- write_elf64_phdr_note(s, &phdr64);
+ prepare_elf64_phdr_note(s, &phdr64);
size = sizeof(phdr64);
phdr = &phdr64;
} else {
- write_elf32_phdr_note(s, &phdr32);
+ prepare_elf32_phdr_note(s, &phdr32);
size = sizeof(phdr32);
phdr = &phdr32;
}
@@ -443,29 +458,30 @@ static void get_offset_range(hwaddr phys_addr,
*p_offset = -1;
*p_filesz = 0;
- if (s->has_filter) {
- if (phys_addr < s->begin || phys_addr >= s->begin + s->length) {
+ if (dump_has_filter(s)) {
+ if (phys_addr < s->filter_area_begin ||
+ phys_addr >= s->filter_area_begin + s->filter_area_length) {
return;
}
}
QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
- if (s->has_filter) {
- if (block->target_start >= s->begin + s->length ||
- block->target_end <= s->begin) {
+ if (dump_has_filter(s)) {
+ if (block->target_start >= s->filter_area_begin + s->filter_area_length ||
+ block->target_end <= s->filter_area_begin) {
/* This block is out of the range */
continue;
}
- if (s->begin <= block->target_start) {
+ if (s->filter_area_begin <= block->target_start) {
start = block->target_start;
} else {
- start = s->begin;
+ start = s->filter_area_begin;
}
size_in_block = block->target_end - start;
- if (s->begin + s->length < block->target_end) {
- size_in_block -= block->target_end - (s->begin + s->length);
+ if (s->filter_area_begin + s->filter_area_length < block->target_end) {
+ size_in_block -= block->target_end - (s->filter_area_begin + s->filter_area_length);
}
} else {
start = block->target_start;
@@ -490,7 +506,7 @@ static void get_offset_range(hwaddr phys_addr,
}
}
-static void write_elf_loads(DumpState *s, Error **errp)
+static void write_elf_phdr_loads(DumpState *s, Error **errp)
{
ERRP_GUARD();
hwaddr offset, filesz;
@@ -558,11 +574,7 @@ static void dump_begin(DumpState *s, Error **errp)
*/
/* write elf header to vmcore */
- if (dump_is_64bit(s)) {
- write_elf64_header(s, errp);
- } else {
- write_elf32_header(s, errp);
- }
+ write_elf_header(s, errp);
if (*errp) {
return;
}
@@ -573,8 +585,8 @@ static void dump_begin(DumpState *s, Error **errp)
return;
}
- /* write all PT_LOAD to vmcore */
- write_elf_loads(s, errp);
+ /* write all PT_LOADs to vmcore */
+ write_elf_phdr_loads(s, errp);
if (*errp) {
return;
}
@@ -591,31 +603,43 @@ static void dump_begin(DumpState *s, Error **errp)
write_elf_notes(s, errp);
}
-static int get_next_block(DumpState *s, GuestPhysBlock *block)
+static int64_t dump_filtered_memblock_size(GuestPhysBlock *block,
+ int64_t filter_area_start,
+ int64_t filter_area_length)
{
- while (1) {
- block = QTAILQ_NEXT(block, next);
- if (!block) {
- /* no more block */
- return 1;
- }
+ int64_t size, left, right;
- s->start = 0;
- s->next_block = block;
- if (s->has_filter) {
- if (block->target_start >= s->begin + s->length ||
- block->target_end <= s->begin) {
- /* This block is out of the range */
- continue;
- }
+ /* No filter, return full size */
+ if (!filter_area_length) {
+ return block->target_end - block->target_start;
+ }
- if (s->begin > block->target_start) {
- s->start = s->begin - block->target_start;
- }
+ /* calculate the overlapped region. */
+ left = MAX(filter_area_start, block->target_start);
+ right = MIN(filter_area_start + filter_area_length, block->target_end);
+ size = right - left;
+ size = size > 0 ? size : 0;
+
+ return size;
+}
+
+static int64_t dump_filtered_memblock_start(GuestPhysBlock *block,
+ int64_t filter_area_start,
+ int64_t filter_area_length)
+{
+ if (filter_area_length) {
+ /* return -1 if the block is not within filter area */
+ if (block->target_start >= filter_area_start + filter_area_length ||
+ block->target_end <= filter_area_start) {
+ return -1;
}
- return 0;
+ if (filter_area_start > block->target_start) {
+ return filter_area_start - block->target_start;
+ }
}
+
+ return 0;
}
/* write all memory to vmcore */
@@ -623,24 +647,22 @@ static void dump_iterate(DumpState *s, Error **errp)
{
ERRP_GUARD();
GuestPhysBlock *block;
- int64_t size;
-
- do {
- block = s->next_block;
+ int64_t memblock_size, memblock_start;
- size = block->target_end - block->target_start;
- if (s->has_filter) {
- size -= s->start;
- if (s->begin + s->length < block->target_end) {
- size -= block->target_end - (s->begin + s->length);
- }
+ QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
+ memblock_start = dump_filtered_memblock_start(block, s->filter_area_begin, s->filter_area_length);
+ if (memblock_start == -1) {
+ continue;
}
- write_memory(s, block, s->start, size, errp);
+
+ memblock_size = dump_filtered_memblock_size(block, s->filter_area_begin, s->filter_area_length);
+
+ /* Write the memory to file */
+ write_memory(s, block, memblock_start, memblock_size, errp);
if (*errp) {
return;
}
-
- } while (!get_next_block(s, block));
+ }
}
static void create_vmcore(DumpState *s, Error **errp)
@@ -1094,55 +1116,81 @@ static uint64_t dump_pfn_to_paddr(DumpState *s, uint64_t pfn)
}
/*
- * 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.
+ * Return the page frame number and the page content in *bufptr. bufptr can be
+ * NULL. If not NULL, *bufptr must contains a target page size of pre-allocated
+ * memory. This is not necessarily the memory returned.
*/
static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
uint8_t **bufptr, DumpState *s)
{
GuestPhysBlock *block = *blockptr;
- hwaddr addr, target_page_mask = ~((hwaddr)s->dump_info.page_size - 1);
- uint8_t *buf;
+ uint32_t page_size = s->dump_info.page_size;
+ uint8_t *buf = NULL, *hbuf;
+ hwaddr addr;
/* 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 = dump_paddr_to_pfn(s, block->target_start);
- if (bufptr) {
- *bufptr = block->host_addr;
- }
- return true;
+ addr = block->target_start;
+ *pfnptr = dump_paddr_to_pfn(s, addr);
+ } else {
+ *pfnptr += 1;
+ addr = dump_pfn_to_paddr(s, *pfnptr);
}
+ assert(block != NULL);
- *pfnptr = *pfnptr + 1;
- addr = dump_pfn_to_paddr(s, *pfnptr);
+ while (1) {
+ if (addr >= block->target_start && addr < block->target_end) {
+ size_t n = MIN(block->target_end - addr, page_size - addr % page_size);
+ hbuf = block->host_addr + (addr - block->target_start);
+ if (!buf) {
+ if (n == page_size) {
+ /* this is a whole target page, go for it */
+ assert(addr % page_size == 0);
+ buf = hbuf;
+ break;
+ } else if (bufptr) {
+ assert(*bufptr);
+ buf = *bufptr;
+ memset(buf, 0, page_size);
+ } else {
+ return true;
+ }
+ }
- if ((addr >= block->target_start) &&
- (addr + s->dump_info.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;
+ memcpy(buf + addr % page_size, hbuf, n);
+ addr += n;
+ if (addr % page_size == 0) {
+ /* we filled up the page */
+ break;
+ }
+ } else {
+ /* the next page is in the next block */
+ *blockptr = block = QTAILQ_NEXT(block, next);
+ if (!block) {
+ break;
+ }
+
+ addr = block->target_start;
+ /* are we still in the same page? */
+ if (dump_paddr_to_pfn(s, addr) != *pfnptr) {
+ if (buf) {
+ /* no, but we already filled something earlier, return it */
+ break;
+ } else {
+ /* else continue from there */
+ *pfnptr = dump_paddr_to_pfn(s, addr);
+ }
+ }
}
- assert((block->target_start & ~target_page_mask) == 0);
- assert((block->target_end & ~target_page_mask) == 0);
- *pfnptr = dump_paddr_to_pfn(s, block->target_start);
- buf = block->host_addr;
}
if (bufptr) {
*bufptr = buf;
}
- return true;
+ return buf != NULL;
}
static void write_dump_bitmap(DumpState *s, Error **errp)
@@ -1280,6 +1328,7 @@ static void write_dump_pages(DumpState *s, Error **errp)
uint8_t *buf;
GuestPhysBlock *block_iter = NULL;
uint64_t pfn_iter;
+ g_autofree uint8_t *page = NULL;
/* get offset of page_desc and page_data in dump file */
offset_desc = s->offset_page;
@@ -1315,12 +1364,13 @@ static void write_dump_pages(DumpState *s, Error **errp)
}
offset_data += s->dump_info.page_size;
+ page = g_malloc(s->dump_info.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)) {
+ for (buf = page; get_next_page(&block_iter, &pfn_iter, &buf, s); buf = page) {
/* check zero page */
if (buffer_is_zero(buf, s->dump_info.page_size)) {
ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor),
@@ -1490,30 +1540,22 @@ static void create_kdump_vmcore(DumpState *s, Error **errp)
}
}
-static ram_addr_t get_start_block(DumpState *s)
+static int validate_start_block(DumpState *s)
{
GuestPhysBlock *block;
- if (!s->has_filter) {
- s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
+ if (!dump_has_filter(s)) {
return 0;
}
QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
- if (block->target_start >= s->begin + s->length ||
- block->target_end <= s->begin) {
- /* This block is out of the range */
+ /* This block is out of the range */
+ if (block->target_start >= s->filter_area_begin + s->filter_area_length ||
+ block->target_end <= s->filter_area_begin) {
continue;
}
-
- s->next_block = block;
- if (s->begin > block->target_start) {
- s->start = s->begin - block->target_start;
- } else {
- s->start = 0;
- }
- return s->start;
- }
+ return 0;
+ }
return -1;
}
@@ -1540,25 +1582,19 @@ bool qemu_system_dump_in_progress(void)
return (qatomic_read(&state->status) == DUMP_STATUS_ACTIVE);
}
-/* calculate total size of memory to be dumped (taking filter into
- * acoount.) */
+/*
+ * calculate total size of memory to be dumped (taking filter into
+ * account.)
+ */
static int64_t dump_calculate_size(DumpState *s)
{
GuestPhysBlock *block;
- int64_t size = 0, total = 0, left = 0, right = 0;
+ int64_t total = 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;
+ total += dump_filtered_memblock_size(block,
+ s->filter_area_begin,
+ s->filter_area_length);
}
return total;
@@ -1641,9 +1677,12 @@ static void dump_init(DumpState *s, int fd, bool has_format,
}
s->fd = fd;
- s->has_filter = has_filter;
- s->begin = begin;
- s->length = length;
+ if (has_filter && !length) {
+ error_setg(errp, QERR_INVALID_PARAMETER, "length");
+ goto cleanup;
+ }
+ s->filter_area_begin = begin;
+ s->filter_area_length = length;
memory_mapping_list_init(&s->list);
@@ -1660,8 +1699,8 @@ static void dump_init(DumpState *s, int fd, bool has_format,
goto cleanup;
}
- s->start = get_start_block(s);
- if (s->start == -1) {
+ /* Is the filter filtering everything? */
+ if (validate_start_block(s) == -1) {
error_setg(errp, QERR_INVALID_PARAMETER, "begin");
goto cleanup;
}
@@ -1776,8 +1815,8 @@ static void dump_init(DumpState *s, int fd, bool has_format,
return;
}
- if (s->has_filter) {
- memory_mapping_filter(&s->list, s->begin, s->length);
+ if (dump_has_filter(s)) {
+ memory_mapping_filter(&s->list, s->filter_area_begin, s->filter_area_length);
}
/*
generated by cgit v1.2.3 (git 2.26.2) at 2025-03-01 11:13:54 +0000