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dump: allow target to set the page size

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This is necessary for targets that don't have TARGET_PAGE_SIZE ==
real-target-page-size. The target should set the page size to the
correct one, if known, or, if not known, to the maximum page size
it supports.

(No functional change.)

Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1452542185-10914-4-git-send-email-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Andrew Jones 2016-01-11 20:56:20 +01:00 committed by Peter Maydell
parent b09afd58e4
commit 8161befdd1
3 changed files with 85 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

127
dump.c
View File

@ -347,18 +347,18 @@ static void write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start,
int64_t i;
Error *local_err = NULL;
for (i = 0; i < size / TARGET_PAGE_SIZE; i++) {
write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,
TARGET_PAGE_SIZE, &local_err);
for (i = 0; i < size / s->dump_info.page_size; i++) {
write_data(s, block->host_addr + start + i * s->dump_info.page_size,
s->dump_info.page_size, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
if ((size % TARGET_PAGE_SIZE) != 0) {
write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,
size % TARGET_PAGE_SIZE, &local_err);
if ((size % s->dump_info.page_size) != 0) {
write_data(s, block->host_addr + start + i * s->dump_info.page_size,
size % s->dump_info.page_size, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
@ -737,7 +737,7 @@ static void create_header32(DumpState *s, Error **errp)
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
dh->header_version = cpu_to_dump32(s, 6);
block_size = TARGET_PAGE_SIZE;
block_size = s->dump_info.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);
@ -837,7 +837,7 @@ static void create_header64(DumpState *s, Error **errp)
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
dh->header_version = cpu_to_dump32(s, 6);
block_size = TARGET_PAGE_SIZE;
block_size = s->dump_info.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);
@ -933,6 +933,11 @@ static void write_dump_header(DumpState *s, Error **errp)
}
}
static size_t dump_bitmap_get_bufsize(DumpState *s)
{
return s->dump_info.page_size;
}
/*
* 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.
@ -946,6 +951,8 @@ static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value,
off_t old_offset, new_offset;
off_t offset_bitmap1, offset_bitmap2;
uint32_t byte, bit;
size_t bitmap_bufsize = dump_bitmap_get_bufsize(s);
size_t bits_per_buf = bitmap_bufsize * CHAR_BIT;
/* should not set the previous place */
assert(last_pfn <= pfn);
@ -956,14 +963,14 @@ static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value,
* 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);
old_offset = bitmap_bufsize * (last_pfn / bits_per_buf);
new_offset = bitmap_bufsize * (pfn / bits_per_buf);
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) {
bitmap_bufsize) < 0) {
return -1;
}
@ -971,17 +978,17 @@ static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value,
offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap +
old_offset;
if (write_buffer(s->fd, offset_bitmap2, buf,
BUFSIZE_BITMAP) < 0) {
bitmap_bufsize) < 0) {
return -1;
}
memset(buf, 0, BUFSIZE_BITMAP);
old_offset += BUFSIZE_BITMAP;
memset(buf, 0, bitmap_bufsize);
old_offset += bitmap_bufsize;
}
/* 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;
byte = (pfn % bits_per_buf) / CHAR_BIT;
bit = (pfn % bits_per_buf) % CHAR_BIT;
if (value) {
buf[byte] |= 1u << bit;
} else {
@ -991,6 +998,20 @@ static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value,
return 0;
}
static uint64_t dump_paddr_to_pfn(DumpState *s, uint64_t addr)
{
int target_page_shift = ctz32(s->dump_info.page_size);
return (addr >> target_page_shift) - ARCH_PFN_OFFSET;
}
static uint64_t dump_pfn_to_paddr(DumpState *s, uint64_t pfn)
{
int target_page_shift = ctz32(s->dump_info.page_size);
return (pfn + ARCH_PFN_OFFSET) << target_page_shift;
}
/*
* 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
@ -1001,16 +1022,16 @@ static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
uint8_t **bufptr, DumpState *s)
{
GuestPhysBlock *block = *blockptr;
hwaddr addr;
hwaddr addr, target_page_mask = ~((hwaddr)s->dump_info.page_size - 1);
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);
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;
}
@ -1018,10 +1039,10 @@ static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
}
*pfnptr = *pfnptr + 1;
addr = pfn_to_paddr(*pfnptr);
addr = dump_pfn_to_paddr(s, *pfnptr);
if ((addr >= block->target_start) &&
(addr + TARGET_PAGE_SIZE <= block->target_end)) {
(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 */
@ -1030,9 +1051,9 @@ static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
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);
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;
}
@ -1050,9 +1071,11 @@ static void write_dump_bitmap(DumpState *s, Error **errp)
void *dump_bitmap_buf;
size_t num_dumpable;
GuestPhysBlock *block_iter = NULL;
size_t bitmap_bufsize = dump_bitmap_get_bufsize(s);
size_t bits_per_buf = bitmap_bufsize * CHAR_BIT;
/* dump_bitmap_buf is used to store dump_bitmap temporarily */
dump_bitmap_buf = g_malloc0(BUFSIZE_BITMAP);
dump_bitmap_buf = g_malloc0(bitmap_bufsize);
num_dumpable = 0;
last_pfn = 0;
@ -1074,11 +1097,11 @@ static void write_dump_bitmap(DumpState *s, Error **errp)
/*
* 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.
* set the remaining bits from last_pfn to the end of the bitmap buffer to
* 0. With those set, the un-sync bit will be synchronized into the vmcore.
*/
if (num_dumpable > 0) {
ret = set_dump_bitmap(last_pfn, last_pfn + PFN_BUFBITMAP, false,
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);
@ -1098,8 +1121,8 @@ static void prepare_data_cache(DataCache *data_cache, DumpState *s,
{
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->buf_size = 4 * dump_bitmap_get_bufsize(s);
data_cache->buf = g_malloc0(data_cache->buf_size);
data_cache->offset = offset;
}
@ -1193,7 +1216,7 @@ static void write_dump_pages(DumpState *s, Error **errp)
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);
len_buf_out = get_len_buf_out(s->dump_info.page_size, s->flag_compress);
assert(len_buf_out != 0);
#ifdef CONFIG_LZO
@ -1206,19 +1229,19 @@ static void write_dump_pages(DumpState *s, Error **errp)
* 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.size = cpu_to_dump32(s, s->dump_info.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);
buf = g_malloc0(s->dump_info.page_size);
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);
goto out;
}
offset_data += TARGET_PAGE_SIZE;
offset_data += s->dump_info.page_size;
/*
* dump memory to vmcore page by page. zero page will all be resided in the
@ -1226,7 +1249,7 @@ static void write_dump_pages(DumpState *s, Error **errp)
*/
while (get_next_page(&block_iter, &pfn_iter, &buf, s)) {
/* check zero page */
if (is_zero_page(buf, TARGET_PAGE_SIZE)) {
if (is_zero_page(buf, s->dump_info.page_size)) {
ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor),
false);
if (ret < 0) {
@ -1248,8 +1271,8 @@ static void write_dump_pages(DumpState *s, Error **errp)
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)) {
s->dump_info.page_size, Z_BEST_SPEED) == Z_OK) &&
(size_out < s->dump_info.page_size)) {
pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB);
pd.size = cpu_to_dump32(s, size_out);
@ -1260,9 +1283,9 @@ static void write_dump_pages(DumpState *s, Error **errp)
}
#ifdef CONFIG_LZO
} else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) &&
(lzo1x_1_compress(buf, TARGET_PAGE_SIZE, buf_out,
(lzo1x_1_compress(buf, s->dump_info.page_size, buf_out,
(lzo_uint *)&size_out, wrkmem) == LZO_E_OK) &&
(size_out < TARGET_PAGE_SIZE)) {
(size_out < s->dump_info.page_size)) {
pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO);
pd.size = cpu_to_dump32(s, size_out);
@ -1274,9 +1297,9 @@ static void write_dump_pages(DumpState *s, Error **errp)
#endif
#ifdef CONFIG_SNAPPY
} else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) &&
(snappy_compress((char *)buf, TARGET_PAGE_SIZE,
(snappy_compress((char *)buf, s->dump_info.page_size,
(char *)buf_out, &size_out) == SNAPPY_OK) &&
(size_out < TARGET_PAGE_SIZE)) {
(size_out < s->dump_info.page_size)) {
pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY);
pd.size = cpu_to_dump32(s, size_out);
@ -1289,13 +1312,14 @@ static void write_dump_pages(DumpState *s, Error **errp)
} else {
/*
* fall back to save in plaintext, size_out should be
* assigned TARGET_PAGE_SIZE
* assigned the target's page size
*/
pd.flags = cpu_to_dump32(s, 0);
size_out = TARGET_PAGE_SIZE;
size_out = s->dump_info.page_size;
pd.size = cpu_to_dump32(s, size_out);
ret = write_cache(&page_data, buf, TARGET_PAGE_SIZE, false);
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);
goto out;
@ -1430,7 +1454,7 @@ 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->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end);
}
static void dump_init(DumpState *s, int fd, bool has_format,
@ -1489,6 +1513,10 @@ static void dump_init(DumpState *s, int fd, bool has_format,
goto cleanup;
}
if (!s->dump_info.page_size) {
s->dump_info.page_size = TARGET_PAGE_SIZE;
}
s->note_size = cpu_get_note_size(s->dump_info.d_class,
s->dump_info.d_machine, nr_cpus);
if (s->note_size < 0) {
@ -1512,8 +1540,9 @@ static void dump_init(DumpState *s, int fd, bool has_format,
get_max_mapnr(s);
uint64_t tmp;
tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), TARGET_PAGE_SIZE);
s->len_dump_bitmap = tmp * TARGET_PAGE_SIZE;
tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT),
s->dump_info.page_size);
s->len_dump_bitmap = tmp * s->dump_info.page_size;
/* init for kdump-compressed format */
if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {

2
include/sysemu/dump-arch.h
View File

@ -18,6 +18,8 @@ typedef struct ArchDumpInfo {
int d_machine; /* Architecture */
int d_endian; /* ELFDATA2LSB or ELFDATA2MSB */
int d_class; /* ELFCLASS32 or ELFCLASS64 */
uint32_t page_size; /* The target's page size. If it's variable and
* unknown, then this should be the maximum. */
} ArchDumpInfo;
struct GuestPhysBlockList; /* memory_mapping.h */

10
include/sysemu/dump.h
View File

@ -20,12 +20,9 @@
#define VERSION_FLAT_HEADER (1) /* version of flattened format */
#define END_FLAG_FLAT_HEADER (-1)
#ifndef ARCH_PFN_OFFSET
#define ARCH_PFN_OFFSET (0)
#define paddr_to_pfn(X) \
(((unsigned long long)(X) >> TARGET_PAGE_BITS) - ARCH_PFN_OFFSET)
#define pfn_to_paddr(X) \
(((unsigned long long)(X) + ARCH_PFN_OFFSET) << TARGET_PAGE_BITS)
#endif
/*
* flag for compressed format
@ -39,9 +36,6 @@
#define PHYS_BASE (0)
#define DUMP_LEVEL (1)
#define DISKDUMP_HEADER_BLOCKS (1)
#define BUFSIZE_BITMAP (TARGET_PAGE_SIZE)
#define PFN_BUFBITMAP (CHAR_BIT * BUFSIZE_BITMAP)
#define BUFSIZE_DATA_CACHE (TARGET_PAGE_SIZE * 4)
#include "sysemu/dump-arch.h"
#include "sysemu/memory_mapping.h"