-#include <stdarg.h>
-#include <stdlib.h>
-#include <zlib.h>
-#ifndef _WIN32
-#include <sys/types.h>
-#include <sys/mman.h>
-#endif
-#include "config.h"
-#include "monitor/monitor.h"
-#include "sysemu/sysemu.h"
-#include "qemu/bitops.h"
-#include "qemu/bitmap.h"
-#include "sysemu/arch_init.h"
-#include "audio/audio.h"
-#include "hw/i386/pc.h"
-#include "hw/pci/pci.h"
-#include "hw/audio/audio.h"
-#include "sysemu/kvm.h"
-#include "migration/migration.h"
-#include "hw/i386/smbios.h"
-#include "exec/address-spaces.h"
-#include "hw/audio/pcspk.h"
-#include "migration/page_cache.h"
-#include "qemu/config-file.h"
-#include "qemu/error-report.h"
-#include "qmp-commands.h"
-#include "trace.h"
-#include "exec/cpu-all.h"
-#include "exec/ram_addr.h"
-#include "hw/acpi/acpi.h"
-#include "qemu/host-utils.h"
-#include "qemu/rcu_queue.h"
-
-#ifdef DEBUG_ARCH_INIT
-#define DPRINTF(fmt, ...) \
- do { fprintf(stdout, "arch_init: " fmt, ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...) \
- do { } while (0)
-#endif
-
-#ifdef TARGET_SPARC
-int graphic_width = 1024;
-int graphic_height = 768;
-int graphic_depth = 8;
-#else
-int graphic_width = 800;
-int graphic_height = 600;
-int graphic_depth = 32;
-#endif
-
-
-#if defined(TARGET_ALPHA)
-#define QEMU_ARCH QEMU_ARCH_ALPHA
-#elif defined(TARGET_ARM)
-#define QEMU_ARCH QEMU_ARCH_ARM
-#elif defined(TARGET_CRIS)
-#define QEMU_ARCH QEMU_ARCH_CRIS
-#elif defined(TARGET_I386)
-#define QEMU_ARCH QEMU_ARCH_I386
-#elif defined(TARGET_M68K)
-#define QEMU_ARCH QEMU_ARCH_M68K
-#elif defined(TARGET_LM32)
-#define QEMU_ARCH QEMU_ARCH_LM32
-#elif defined(TARGET_MICROBLAZE)
-#define QEMU_ARCH QEMU_ARCH_MICROBLAZE
-#elif defined(TARGET_MIPS)
-#define QEMU_ARCH QEMU_ARCH_MIPS
-#elif defined(TARGET_MOXIE)
-#define QEMU_ARCH QEMU_ARCH_MOXIE
-#elif defined(TARGET_OPENRISC)
-#define QEMU_ARCH QEMU_ARCH_OPENRISC
-#elif defined(TARGET_PPC)
-#define QEMU_ARCH QEMU_ARCH_PPC
-#elif defined(TARGET_S390X)
-#define QEMU_ARCH QEMU_ARCH_S390X
-#elif defined(TARGET_SH4)
-#define QEMU_ARCH QEMU_ARCH_SH4
-#elif defined(TARGET_SPARC)
-#define QEMU_ARCH QEMU_ARCH_SPARC
-#elif defined(TARGET_XTENSA)
-#define QEMU_ARCH QEMU_ARCH_XTENSA
-#elif defined(TARGET_UNICORE32)
-#define QEMU_ARCH QEMU_ARCH_UNICORE32
-#elif defined(TARGET_TRICORE)
-#define QEMU_ARCH QEMU_ARCH_TRICORE
-#endif
-
-const uint32_t arch_type = QEMU_ARCH;
-static bool mig_throttle_on;
-static int dirty_rate_high_cnt;
-static void check_guest_throttling(void);
-
-static uint64_t bitmap_sync_count;
-
-/***********************************************************/
-/* ram save/restore */
-
-#define RAM_SAVE_FLAG_FULL 0x01 /* Obsolete, not used anymore */
-#define RAM_SAVE_FLAG_COMPRESS 0x02
-#define RAM_SAVE_FLAG_MEM_SIZE 0x04
-#define RAM_SAVE_FLAG_PAGE 0x08
-#define RAM_SAVE_FLAG_EOS 0x10
-#define RAM_SAVE_FLAG_CONTINUE 0x20
-#define RAM_SAVE_FLAG_XBZRLE 0x40
-/* 0x80 is reserved in migration.h start with 0x100 next */
-#define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100
-
-static struct defconfig_file {
- const char *filename;
- /* Indicates it is an user config file (disabled by -no-user-config) */
- bool userconfig;
-} default_config_files[] = {
- { CONFIG_QEMU_CONFDIR "/qemu.conf", true },
- { CONFIG_QEMU_CONFDIR "/target-" TARGET_NAME ".conf", true },
- { NULL }, /* end of list */
-};
-
-static const uint8_t ZERO_TARGET_PAGE[TARGET_PAGE_SIZE];
-
-int qemu_read_default_config_files(bool userconfig)
-{
- int ret;
- struct defconfig_file *f;
-
- for (f = default_config_files; f->filename; f++) {
- if (!userconfig && f->userconfig) {
- continue;
- }
- ret = qemu_read_config_file(f->filename);
- if (ret < 0 && ret != -ENOENT) {
- return ret;
- }
- }
-
- return 0;
-}
-
-static inline bool is_zero_range(uint8_t *p, uint64_t size)
-{
- return buffer_find_nonzero_offset(p, size) == size;
-}
-
-/* struct contains XBZRLE cache and a static page
- used by the compression */
-static struct {
- /* buffer used for XBZRLE encoding */
- uint8_t *encoded_buf;
- /* buffer for storing page content */
- uint8_t *current_buf;
- /* Cache for XBZRLE, Protected by lock. */
- PageCache *cache;
- QemuMutex lock;
-} XBZRLE;
-
-/* buffer used for XBZRLE decoding */
-static uint8_t *xbzrle_decoded_buf;
-
-static void XBZRLE_cache_lock(void)
-{
- if (migrate_use_xbzrle())
- qemu_mutex_lock(&XBZRLE.lock);
-}
-
-static void XBZRLE_cache_unlock(void)
-{
- if (migrate_use_xbzrle())
- qemu_mutex_unlock(&XBZRLE.lock);
-}
-
-/*
- * called from qmp_migrate_set_cache_size in main thread, possibly while
- * a migration is in progress.
- * A running migration maybe using the cache and might finish during this
- * call, hence changes to the cache are protected by XBZRLE.lock().
- */
-int64_t xbzrle_cache_resize(int64_t new_size)
-{
- PageCache *new_cache;
- int64_t ret;
-
- if (new_size < TARGET_PAGE_SIZE) {
- return -1;
- }
-
- XBZRLE_cache_lock();
-
- if (XBZRLE.cache != NULL) {
- if (pow2floor(new_size) == migrate_xbzrle_cache_size()) {
- goto out_new_size;
- }
- new_cache = cache_init(new_size / TARGET_PAGE_SIZE,
- TARGET_PAGE_SIZE);
- if (!new_cache) {
- error_report("Error creating cache");
- ret = -1;
- goto out;
- }
-
- cache_fini(XBZRLE.cache);
- XBZRLE.cache = new_cache;
- }
-
-out_new_size:
- ret = pow2floor(new_size);
-out:
- XBZRLE_cache_unlock();
- return ret;
-}
-
-/* accounting for migration statistics */
-typedef struct AccountingInfo {
- uint64_t dup_pages;
- uint64_t skipped_pages;
- uint64_t norm_pages;
- uint64_t iterations;
- uint64_t xbzrle_bytes;
- uint64_t xbzrle_pages;
- uint64_t xbzrle_cache_miss;
- double xbzrle_cache_miss_rate;
- uint64_t xbzrle_overflows;
-} AccountingInfo;
-
-static AccountingInfo acct_info;
-
-static void acct_clear(void)
-{
- memset(&acct_info, 0, sizeof(acct_info));
-}
-
-uint64_t dup_mig_bytes_transferred(void)
-{
- return acct_info.dup_pages * TARGET_PAGE_SIZE;
-}
-
-uint64_t dup_mig_pages_transferred(void)
-{
- return acct_info.dup_pages;
-}
-
-uint64_t skipped_mig_bytes_transferred(void)
-{
- return acct_info.skipped_pages * TARGET_PAGE_SIZE;
-}
-
-uint64_t skipped_mig_pages_transferred(void)
-{
- return acct_info.skipped_pages;
-}
-
-uint64_t norm_mig_bytes_transferred(void)
-{
- return acct_info.norm_pages * TARGET_PAGE_SIZE;
-}
-
-uint64_t norm_mig_pages_transferred(void)
-{
- return acct_info.norm_pages;
-}
-
-uint64_t xbzrle_mig_bytes_transferred(void)
-{
- return acct_info.xbzrle_bytes;
-}
-
-uint64_t xbzrle_mig_pages_transferred(void)
-{
- return acct_info.xbzrle_pages;
-}
-
-uint64_t xbzrle_mig_pages_cache_miss(void)
-{
- return acct_info.xbzrle_cache_miss;
-}
-
-double xbzrle_mig_cache_miss_rate(void)
-{
- return acct_info.xbzrle_cache_miss_rate;
-}
-
-uint64_t xbzrle_mig_pages_overflow(void)
-{
- return acct_info.xbzrle_overflows;
-}
-
-/* This is the last block that we have visited serching for dirty pages
- */
-static RAMBlock *last_seen_block;
-/* This is the last block from where we have sent data */
-static RAMBlock *last_sent_block;
-static ram_addr_t last_offset;
-static unsigned long *migration_bitmap;
-static uint64_t migration_dirty_pages;
-static uint32_t last_version;
-static bool ram_bulk_stage;
-
-struct CompressParam {
- bool start;
- bool done;
- QEMUFile *file;
- QemuMutex mutex;
- QemuCond cond;
- RAMBlock *block;
- ram_addr_t offset;
-};
-typedef struct CompressParam CompressParam;
-
-struct DecompressParam {
- bool start;
- QemuMutex mutex;
- QemuCond cond;
- void *des;
- uint8 *compbuf;
- int len;
-};
-typedef struct DecompressParam DecompressParam;
-
-static CompressParam *comp_param;
-static QemuThread *compress_threads;
-/* comp_done_cond is used to wake up the migration thread when
- * one of the compression threads has finished the compression.
- * comp_done_lock is used to co-work with comp_done_cond.
- */
-static QemuMutex *comp_done_lock;
-static QemuCond *comp_done_cond;
-/* The empty QEMUFileOps will be used by file in CompressParam */
-static const QEMUFileOps empty_ops = { };
-
-static bool compression_switch;
-static bool quit_comp_thread;
-static bool quit_decomp_thread;
-static DecompressParam *decomp_param;
-static QemuThread *decompress_threads;
-static uint8_t *compressed_data_buf;
-
-static int do_compress_ram_page(CompressParam *param);
-
-static void *do_data_compress(void *opaque)
-{
- CompressParam *param = opaque;
-
- while (!quit_comp_thread) {
- qemu_mutex_lock(¶m->mutex);
- /* Re-check the quit_comp_thread in case of
- * terminate_compression_threads is called just before
- * qemu_mutex_lock(¶m->mutex) and after
- * while(!quit_comp_thread), re-check it here can make
- * sure the compression thread terminate as expected.
- */
- while (!param->start && !quit_comp_thread) {
- qemu_cond_wait(¶m->cond, ¶m->mutex);
- }
- if (!quit_comp_thread) {
- do_compress_ram_page(param);
- }
- param->start = false;
- qemu_mutex_unlock(¶m->mutex);
-
- qemu_mutex_lock(comp_done_lock);
- param->done = true;
- qemu_cond_signal(comp_done_cond);
- qemu_mutex_unlock(comp_done_lock);
- }
-
- return NULL;
-}
-
-static inline void terminate_compression_threads(void)
-{
- int idx, thread_count;
-
- thread_count = migrate_compress_threads();
- quit_comp_thread = true;
- for (idx = 0; idx < thread_count; idx++) {
- qemu_mutex_lock(&comp_param[idx].mutex);
- qemu_cond_signal(&comp_param[idx].cond);
- qemu_mutex_unlock(&comp_param[idx].mutex);
- }
-}
-
-void migrate_compress_threads_join(void)
-{
- int i, thread_count;
-
- if (!migrate_use_compression()) {
- return;
- }
- terminate_compression_threads();
- thread_count = migrate_compress_threads();
- for (i = 0; i < thread_count; i++) {
- qemu_thread_join(compress_threads + i);
- qemu_fclose(comp_param[i].file);
- qemu_mutex_destroy(&comp_param[i].mutex);
- qemu_cond_destroy(&comp_param[i].cond);
- }
- qemu_mutex_destroy(comp_done_lock);
- qemu_cond_destroy(comp_done_cond);
- g_free(compress_threads);
- g_free(comp_param);
- g_free(comp_done_cond);
- g_free(comp_done_lock);
- compress_threads = NULL;
- comp_param = NULL;
- comp_done_cond = NULL;
- comp_done_lock = NULL;
-}
-
-void migrate_compress_threads_create(void)
-{
- int i, thread_count;
-
- if (!migrate_use_compression()) {
- return;
- }
- quit_comp_thread = false;
- compression_switch = true;
- thread_count = migrate_compress_threads();
- compress_threads = g_new0(QemuThread, thread_count);
- comp_param = g_new0(CompressParam, thread_count);
- comp_done_cond = g_new0(QemuCond, 1);
- comp_done_lock = g_new0(QemuMutex, 1);
- qemu_cond_init(comp_done_cond);
- qemu_mutex_init(comp_done_lock);
- for (i = 0; i < thread_count; i++) {
- /* com_param[i].file is just used as a dummy buffer to save data, set
- * it's ops to empty.
- */
- comp_param[i].file = qemu_fopen_ops(NULL, &empty_ops);
- comp_param[i].done = true;
- qemu_mutex_init(&comp_param[i].mutex);
- qemu_cond_init(&comp_param[i].cond);
- qemu_thread_create(compress_threads + i, "compress",
- do_data_compress, comp_param + i,
- QEMU_THREAD_JOINABLE);
- }
-}
-
-/**
- * save_page_header: Write page header to wire
- *
- * If this is the 1st block, it also writes the block identification
- *
- * Returns: Number of bytes written
- *
- * @f: QEMUFile where to send the data
- * @block: block that contains the page we want to send
- * @offset: offset inside the block for the page
- * in the lower bits, it contains flags
- */
-static size_t save_page_header(QEMUFile *f, RAMBlock *block, ram_addr_t offset)
-{
- size_t size;
-
- qemu_put_be64(f, offset);
- size = 8;
-
- if (!(offset & RAM_SAVE_FLAG_CONTINUE)) {
- qemu_put_byte(f, strlen(block->idstr));
- qemu_put_buffer(f, (uint8_t *)block->idstr,
- strlen(block->idstr));
- size += 1 + strlen(block->idstr);
- }
- return size;
-}
-
-/* Update the xbzrle cache to reflect a page that's been sent as all 0.
- * The important thing is that a stale (not-yet-0'd) page be replaced
- * by the new data.
- * As a bonus, if the page wasn't in the cache it gets added so that
- * when a small write is made into the 0'd page it gets XBZRLE sent
- */
-static void xbzrle_cache_zero_page(ram_addr_t current_addr)
-{
- if (ram_bulk_stage || !migrate_use_xbzrle()) {
- return;
- }
-
- /* We don't care if this fails to allocate a new cache page
- * as long as it updated an old one */
- cache_insert(XBZRLE.cache, current_addr, ZERO_TARGET_PAGE,
- bitmap_sync_count);
-}
-
-#define ENCODING_FLAG_XBZRLE 0x1
-
-/**
- * save_xbzrle_page: compress and send current page
- *
- * Returns: 1 means that we wrote the page
- * 0 means that page is identical to the one already sent
- * -1 means that xbzrle would be longer than normal
- *
- * @f: QEMUFile where to send the data
- * @current_data:
- * @current_addr:
- * @block: block that contains the page we want to send
- * @offset: offset inside the block for the page
- * @last_stage: if we are at the completion stage
- * @bytes_transferred: increase it with the number of transferred bytes
- */
-static int save_xbzrle_page(QEMUFile *f, uint8_t **current_data,
- ram_addr_t current_addr, RAMBlock *block,
- ram_addr_t offset, bool last_stage,
- uint64_t *bytes_transferred)
-{
- int encoded_len = 0, bytes_xbzrle;
- uint8_t *prev_cached_page;
-
- if (!cache_is_cached(XBZRLE.cache, current_addr, bitmap_sync_count)) {
- acct_info.xbzrle_cache_miss++;
- if (!last_stage) {
- if (cache_insert(XBZRLE.cache, current_addr, *current_data,
- bitmap_sync_count) == -1) {
- return -1;
- } else {
- /* update *current_data when the page has been
- inserted into cache */
- *current_data = get_cached_data(XBZRLE.cache, current_addr);
- }
- }
- return -1;
- }
-
- prev_cached_page = get_cached_data(XBZRLE.cache, current_addr);
-
- /* save current buffer into memory */
- memcpy(XBZRLE.current_buf, *current_data, TARGET_PAGE_SIZE);
-
- /* XBZRLE encoding (if there is no overflow) */
- encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf,
- TARGET_PAGE_SIZE, XBZRLE.encoded_buf,
- TARGET_PAGE_SIZE);
- if (encoded_len == 0) {
- DPRINTF("Skipping unmodified page\n");
- return 0;
- } else if (encoded_len == -1) {
- DPRINTF("Overflow\n");
- acct_info.xbzrle_overflows++;
- /* update data in the cache */
- if (!last_stage) {
- memcpy(prev_cached_page, *current_data, TARGET_PAGE_SIZE);
- *current_data = prev_cached_page;
- }
- return -1;
- }
-
- /* we need to update the data in the cache, in order to get the same data */
- if (!last_stage) {
- memcpy(prev_cached_page, XBZRLE.current_buf, TARGET_PAGE_SIZE);
- }
-
- /* Send XBZRLE based compressed page */
- bytes_xbzrle = save_page_header(f, block, offset | RAM_SAVE_FLAG_XBZRLE);
- qemu_put_byte(f, ENCODING_FLAG_XBZRLE);
- qemu_put_be16(f, encoded_len);
- qemu_put_buffer(f, XBZRLE.encoded_buf, encoded_len);
- bytes_xbzrle += encoded_len + 1 + 2;
- acct_info.xbzrle_pages++;
- acct_info.xbzrle_bytes += bytes_xbzrle;
- *bytes_transferred += bytes_xbzrle;
-
- return 1;
-}
-
-static inline
-ram_addr_t migration_bitmap_find_and_reset_dirty(MemoryRegion *mr,
- ram_addr_t start)
-{
- unsigned long base = mr->ram_addr >> TARGET_PAGE_BITS;
- unsigned long nr = base + (start >> TARGET_PAGE_BITS);
- uint64_t mr_size = TARGET_PAGE_ALIGN(memory_region_size(mr));
- unsigned long size = base + (mr_size >> TARGET_PAGE_BITS);
-
- unsigned long next;
-
- if (ram_bulk_stage && nr > base) {
- next = nr + 1;
- } else {
- next = find_next_bit(migration_bitmap, size, nr);
- }
-
- if (next < size) {
- clear_bit(next, migration_bitmap);
- migration_dirty_pages--;
- }
- return (next - base) << TARGET_PAGE_BITS;
-}
-
-static inline bool migration_bitmap_set_dirty(ram_addr_t addr)
-{
- bool ret;
- int nr = addr >> TARGET_PAGE_BITS;
-
- ret = test_and_set_bit(nr, migration_bitmap);
-
- if (!ret) {
- migration_dirty_pages++;
- }
- return ret;
-}
-
-static void migration_bitmap_sync_range(ram_addr_t start, ram_addr_t length)
-{
- ram_addr_t addr;
- unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
-
- /* start address is aligned at the start of a word? */
- if (((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) {
- int k;
- int nr = BITS_TO_LONGS(length >> TARGET_PAGE_BITS);
- unsigned long *src = ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION];
-
- for (k = page; k < page + nr; k++) {
- if (src[k]) {
- unsigned long new_dirty;
- new_dirty = ~migration_bitmap[k];
- migration_bitmap[k] |= src[k];
- new_dirty &= src[k];
- migration_dirty_pages += ctpopl(new_dirty);
- src[k] = 0;
- }
- }
- } else {
- for (addr = 0; addr < length; addr += TARGET_PAGE_SIZE) {
- if (cpu_physical_memory_get_dirty(start + addr,
- TARGET_PAGE_SIZE,
- DIRTY_MEMORY_MIGRATION)) {
- cpu_physical_memory_reset_dirty(start + addr,
- TARGET_PAGE_SIZE,
- DIRTY_MEMORY_MIGRATION);
- migration_bitmap_set_dirty(start + addr);
- }
- }
- }
-}
-
-
-/* Fix me: there are too many global variables used in migration process. */
-static int64_t start_time;
-static int64_t bytes_xfer_prev;
-static int64_t num_dirty_pages_period;
-static uint64_t xbzrle_cache_miss_prev;
-static uint64_t iterations_prev;
-
-static void migration_bitmap_sync_init(void)
-{
- start_time = 0;
- bytes_xfer_prev = 0;
- num_dirty_pages_period = 0;
- xbzrle_cache_miss_prev = 0;
- iterations_prev = 0;
-}
-
-/* Called with iothread lock held, to protect ram_list.dirty_memory[] */
-static void migration_bitmap_sync(void)
-{
- RAMBlock *block;
- uint64_t num_dirty_pages_init = migration_dirty_pages;
- MigrationState *s = migrate_get_current();
- int64_t end_time;
- int64_t bytes_xfer_now;
-
- bitmap_sync_count++;
-
- if (!bytes_xfer_prev) {
- bytes_xfer_prev = ram_bytes_transferred();
- }
-
- if (!start_time) {
- start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
- }
-
- trace_migration_bitmap_sync_start();
- address_space_sync_dirty_bitmap(&address_space_memory);
-
- rcu_read_lock();
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
- migration_bitmap_sync_range(block->mr->ram_addr, block->used_length);
- }
- rcu_read_unlock();
-
- trace_migration_bitmap_sync_end(migration_dirty_pages
- - num_dirty_pages_init);
- num_dirty_pages_period += migration_dirty_pages - num_dirty_pages_init;
- end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-
- /* more than 1 second = 1000 millisecons */
- if (end_time > start_time + 1000) {
- if (migrate_auto_converge()) {
- /* The following detection logic can be refined later. For now:
- Check to see if the dirtied bytes is 50% more than the approx.
- amount of bytes that just got transferred since the last time we
- were in this routine. If that happens >N times (for now N==4)
- we turn on the throttle down logic */
- bytes_xfer_now = ram_bytes_transferred();
- if (s->dirty_pages_rate &&
- (num_dirty_pages_period * TARGET_PAGE_SIZE >
- (bytes_xfer_now - bytes_xfer_prev)/2) &&
- (dirty_rate_high_cnt++ > 4)) {
- trace_migration_throttle();
- mig_throttle_on = true;
- dirty_rate_high_cnt = 0;
- }
- bytes_xfer_prev = bytes_xfer_now;
- } else {
- mig_throttle_on = false;
- }
- if (migrate_use_xbzrle()) {
- if (iterations_prev != acct_info.iterations) {
- acct_info.xbzrle_cache_miss_rate =
- (double)(acct_info.xbzrle_cache_miss -
- xbzrle_cache_miss_prev) /
- (acct_info.iterations - iterations_prev);
- }
- iterations_prev = acct_info.iterations;
- xbzrle_cache_miss_prev = acct_info.xbzrle_cache_miss;
- }
- s->dirty_pages_rate = num_dirty_pages_period * 1000
- / (end_time - start_time);
- s->dirty_bytes_rate = s->dirty_pages_rate * TARGET_PAGE_SIZE;
- start_time = end_time;
- num_dirty_pages_period = 0;
- s->dirty_sync_count = bitmap_sync_count;
- }
-}
-
-/**
- * save_zero_page: Send the zero page to the stream
- *
- * Returns: Number of pages written.
- *
- * @f: QEMUFile where to send the data
- * @block: block that contains the page we want to send
- * @offset: offset inside the block for the page
- * @p: pointer to the page
- * @bytes_transferred: increase it with the number of transferred bytes
- */
-static int save_zero_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
- uint8_t *p, uint64_t *bytes_transferred)
-{
- int pages = -1;
-
- if (is_zero_range(p, TARGET_PAGE_SIZE)) {
- acct_info.dup_pages++;
- *bytes_transferred += save_page_header(f, block,
- offset | RAM_SAVE_FLAG_COMPRESS);
- qemu_put_byte(f, 0);
- *bytes_transferred += 1;
- pages = 1;
- }
-
- return pages;
-}
-
-/**
- * ram_save_page: Send the given page to the stream
- *
- * Returns: Number of pages written.
- *
- * @f: QEMUFile where to send the data
- * @block: block that contains the page we want to send
- * @offset: offset inside the block for the page
- * @last_stage: if we are at the completion stage
- * @bytes_transferred: increase it with the number of transferred bytes
- */
-static int ram_save_page(QEMUFile *f, RAMBlock* block, ram_addr_t offset,
- bool last_stage, uint64_t *bytes_transferred)
-{
- int pages = -1;
- uint64_t bytes_xmit;
- ram_addr_t current_addr;
- MemoryRegion *mr = block->mr;
- uint8_t *p;
- int ret;
- bool send_async = true;
-
- p = memory_region_get_ram_ptr(mr) + offset;
-
- /* In doubt sent page as normal */
- bytes_xmit = 0;
- ret = ram_control_save_page(f, block->offset,
- offset, TARGET_PAGE_SIZE, &bytes_xmit);
- if (bytes_xmit) {
- *bytes_transferred += bytes_xmit;
- pages = 1;
- }
-
- XBZRLE_cache_lock();
-
- current_addr = block->offset + offset;
-
- if (block == last_sent_block) {
- offset |= RAM_SAVE_FLAG_CONTINUE;
- }
- if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
- if (ret != RAM_SAVE_CONTROL_DELAYED) {
- if (bytes_xmit > 0) {
- acct_info.norm_pages++;
- } else if (bytes_xmit == 0) {
- acct_info.dup_pages++;
- }
- }
- } else {
- pages = save_zero_page(f, block, offset, p, bytes_transferred);
- if (pages > 0) {
- /* Must let xbzrle know, otherwise a previous (now 0'd) cached
- * page would be stale
- */
- xbzrle_cache_zero_page(current_addr);
- } else if (!ram_bulk_stage && migrate_use_xbzrle()) {
- pages = save_xbzrle_page(f, &p, current_addr, block,
- offset, last_stage, bytes_transferred);
- if (!last_stage) {
- /* Can't send this cached data async, since the cache page
- * might get updated before it gets to the wire
- */
- send_async = false;
- }
- }
- }
-
- /* XBZRLE overflow or normal page */
- if (pages == -1) {
- *bytes_transferred += save_page_header(f, block,
- offset | RAM_SAVE_FLAG_PAGE);
- if (send_async) {
- qemu_put_buffer_async(f, p, TARGET_PAGE_SIZE);
- } else {
- qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
- }
- *bytes_transferred += TARGET_PAGE_SIZE;
- pages = 1;
- acct_info.norm_pages++;
- }
-
- XBZRLE_cache_unlock();
-
- return pages;
-}
-
-static int do_compress_ram_page(CompressParam *param)
-{
- int bytes_sent, blen;
- uint8_t *p;
- RAMBlock *block = param->block;
- ram_addr_t offset = param->offset;
-
- p = memory_region_get_ram_ptr(block->mr) + (offset & TARGET_PAGE_MASK);
-
- bytes_sent = save_page_header(param->file, block, offset |
- RAM_SAVE_FLAG_COMPRESS_PAGE);
- blen = qemu_put_compression_data(param->file, p, TARGET_PAGE_SIZE,
- migrate_compress_level());
- bytes_sent += blen;
-
- return bytes_sent;
-}
-
-static inline void start_compression(CompressParam *param)
-{
- param->done = false;
- qemu_mutex_lock(¶m->mutex);
- param->start = true;
- qemu_cond_signal(¶m->cond);
- qemu_mutex_unlock(¶m->mutex);
-}
-
-static inline void start_decompression(DecompressParam *param)
-{
- qemu_mutex_lock(¶m->mutex);
- param->start = true;
- qemu_cond_signal(¶m->cond);
- qemu_mutex_unlock(¶m->mutex);
-}
-
-static uint64_t bytes_transferred;
-
-static void flush_compressed_data(QEMUFile *f)
-{
- int idx, len, thread_count;
-
- if (!migrate_use_compression()) {
- return;
- }
- thread_count = migrate_compress_threads();
- for (idx = 0; idx < thread_count; idx++) {
- if (!comp_param[idx].done) {
- qemu_mutex_lock(comp_done_lock);
- while (!comp_param[idx].done && !quit_comp_thread) {
- qemu_cond_wait(comp_done_cond, comp_done_lock);
- }
- qemu_mutex_unlock(comp_done_lock);
- }
- if (!quit_comp_thread) {
- len = qemu_put_qemu_file(f, comp_param[idx].file);
- bytes_transferred += len;
- }
- }
-}
-
-static inline void set_compress_params(CompressParam *param, RAMBlock *block,
- ram_addr_t offset)
-{
- param->block = block;
- param->offset = offset;
-}
-
-static int compress_page_with_multi_thread(QEMUFile *f, RAMBlock *block,
- ram_addr_t offset,
- uint64_t *bytes_transferred)
-{
- int idx, thread_count, bytes_xmit = -1, pages = -1;
-
- thread_count = migrate_compress_threads();
- qemu_mutex_lock(comp_done_lock);
- while (true) {
- for (idx = 0; idx < thread_count; idx++) {
- if (comp_param[idx].done) {
- bytes_xmit = qemu_put_qemu_file(f, comp_param[idx].file);
- set_compress_params(&comp_param[idx], block, offset);
- start_compression(&comp_param[idx]);
- pages = 1;
- acct_info.norm_pages++;
- *bytes_transferred += bytes_xmit;
- break;
- }
- }
- if (pages > 0) {
- break;
- } else {
- qemu_cond_wait(comp_done_cond, comp_done_lock);
- }
- }
- qemu_mutex_unlock(comp_done_lock);
-
- return pages;
-}
-
-/**
- * ram_save_compressed_page: compress the given page and send it to the stream
- *
- * Returns: Number of pages written.
- *
- * @f: QEMUFile where to send the data
- * @block: block that contains the page we want to send
- * @offset: offset inside the block for the page
- * @last_stage: if we are at the completion stage
- * @bytes_transferred: increase it with the number of transferred bytes
- */
-static int ram_save_compressed_page(QEMUFile *f, RAMBlock *block,
- ram_addr_t offset, bool last_stage,
- uint64_t *bytes_transferred)
-{
- int pages = -1;
- uint64_t bytes_xmit;
- MemoryRegion *mr = block->mr;
- uint8_t *p;
- int ret;
-
- p = memory_region_get_ram_ptr(mr) + offset;
-
- bytes_xmit = 0;
- ret = ram_control_save_page(f, block->offset,
- offset, TARGET_PAGE_SIZE, &bytes_xmit);
- if (bytes_xmit) {
- *bytes_transferred += bytes_xmit;
- pages = 1;
- }
- if (block == last_sent_block) {
- offset |= RAM_SAVE_FLAG_CONTINUE;
- }
- if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
- if (ret != RAM_SAVE_CONTROL_DELAYED) {
- if (bytes_xmit > 0) {
- acct_info.norm_pages++;
- } else if (bytes_xmit == 0) {
- acct_info.dup_pages++;
- }
- }
- } else {
- /* When starting the process of a new block, the first page of
- * the block should be sent out before other pages in the same
- * block, and all the pages in last block should have been sent
- * out, keeping this order is important, because the 'cont' flag
- * is used to avoid resending the block name.
- */
- if (block != last_sent_block) {
- flush_compressed_data(f);
- pages = save_zero_page(f, block, offset, p, bytes_transferred);
- if (pages == -1) {
- set_compress_params(&comp_param[0], block, offset);
- /* Use the qemu thread to compress the data to make sure the
- * first page is sent out before other pages
- */
- bytes_xmit = do_compress_ram_page(&comp_param[0]);
- acct_info.norm_pages++;
- qemu_put_qemu_file(f, comp_param[0].file);
- *bytes_transferred += bytes_xmit;
- pages = 1;
- }
- } else {
- pages = save_zero_page(f, block, offset, p, bytes_transferred);
- if (pages == -1) {
- pages = compress_page_with_multi_thread(f, block, offset,
- bytes_transferred);
- }
- }
- }
-
- return pages;
-}
-
-/**
- * ram_find_and_save_block: Finds a dirty page and sends it to f
- *
- * Called within an RCU critical section.
- *
- * Returns: The number of pages written
- * 0 means no dirty pages
- *
- * @f: QEMUFile where to send the data
- * @last_stage: if we are at the completion stage
- * @bytes_transferred: increase it with the number of transferred bytes
- */
-
-static int ram_find_and_save_block(QEMUFile *f, bool last_stage,
- uint64_t *bytes_transferred)
-{
- RAMBlock *block = last_seen_block;
- ram_addr_t offset = last_offset;
- bool complete_round = false;
- int pages = 0;
- MemoryRegion *mr;
-
- if (!block)
- block = QLIST_FIRST_RCU(&ram_list.blocks);
-
- while (true) {
- mr = block->mr;
- offset = migration_bitmap_find_and_reset_dirty(mr, offset);
- if (complete_round && block == last_seen_block &&
- offset >= last_offset) {
- break;
- }
- if (offset >= block->used_length) {
- offset = 0;
- block = QLIST_NEXT_RCU(block, next);
- if (!block) {
- block = QLIST_FIRST_RCU(&ram_list.blocks);
- complete_round = true;
- ram_bulk_stage = false;
- if (migrate_use_xbzrle()) {
- /* If xbzrle is on, stop using the data compression at this
- * point. In theory, xbzrle can do better than compression.
- */
- flush_compressed_data(f);
- compression_switch = false;
- }
- }
- } else {
- if (compression_switch && migrate_use_compression()) {
- pages = ram_save_compressed_page(f, block, offset, last_stage,
- bytes_transferred);
- } else {
- pages = ram_save_page(f, block, offset, last_stage,
- bytes_transferred);
- }
-
- /* if page is unmodified, continue to the next */
- if (pages > 0) {
- last_sent_block = block;
- break;
- }
- }
- }
-
- last_seen_block = block;
- last_offset = offset;
-
- return pages;
-}
-
-void acct_update_position(QEMUFile *f, size_t size, bool zero)
-{
- uint64_t pages = size / TARGET_PAGE_SIZE;
- if (zero) {
- acct_info.dup_pages += pages;
- } else {
- acct_info.norm_pages += pages;
- bytes_transferred += size;
- qemu_update_position(f, size);
- }
-}
-
-static ram_addr_t ram_save_remaining(void)
-{
- return migration_dirty_pages;
-}
-
-uint64_t ram_bytes_remaining(void)
-{
- return ram_save_remaining() * TARGET_PAGE_SIZE;
-}
-
-uint64_t ram_bytes_transferred(void)
-{
- return bytes_transferred;
-}
-
-uint64_t ram_bytes_total(void)
-{
- RAMBlock *block;
- uint64_t total = 0;
-
- rcu_read_lock();
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next)
- total += block->used_length;
- rcu_read_unlock();
- return total;
-}
-
-void free_xbzrle_decoded_buf(void)
-{
- g_free(xbzrle_decoded_buf);
- xbzrle_decoded_buf = NULL;
-}
-
-static void migration_end(void)
-{
- if (migration_bitmap) {
- memory_global_dirty_log_stop();
- g_free(migration_bitmap);
- migration_bitmap = NULL;
- }
-
- XBZRLE_cache_lock();
- if (XBZRLE.cache) {
- cache_fini(XBZRLE.cache);
- g_free(XBZRLE.encoded_buf);
- g_free(XBZRLE.current_buf);
- XBZRLE.cache = NULL;
- XBZRLE.encoded_buf = NULL;
- XBZRLE.current_buf = NULL;
- }
- XBZRLE_cache_unlock();
-}
-
-static void ram_migration_cancel(void *opaque)
-{
- migration_end();
-}
-
-static void reset_ram_globals(void)
-{
- last_seen_block = NULL;
- last_sent_block = NULL;
- last_offset = 0;
- last_version = ram_list.version;
- ram_bulk_stage = true;
-}
-
-#define MAX_WAIT 50 /* ms, half buffered_file limit */
-
-
-/* Each of ram_save_setup, ram_save_iterate and ram_save_complete has
- * long-running RCU critical section. When rcu-reclaims in the code
- * start to become numerous it will be necessary to reduce the
- * granularity of these critical sections.
- */
-
-static int ram_save_setup(QEMUFile *f, void *opaque)
-{
- RAMBlock *block;
- int64_t ram_bitmap_pages; /* Size of bitmap in pages, including gaps */
-
- mig_throttle_on = false;
- dirty_rate_high_cnt = 0;
- bitmap_sync_count = 0;
- migration_bitmap_sync_init();
-
- if (migrate_use_xbzrle()) {
- XBZRLE_cache_lock();
- XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() /
- TARGET_PAGE_SIZE,
- TARGET_PAGE_SIZE);
- if (!XBZRLE.cache) {
- XBZRLE_cache_unlock();
- error_report("Error creating cache");
- return -1;
- }
- XBZRLE_cache_unlock();
-
- /* We prefer not to abort if there is no memory */
- XBZRLE.encoded_buf = g_try_malloc0(TARGET_PAGE_SIZE);
- if (!XBZRLE.encoded_buf) {
- error_report("Error allocating encoded_buf");
- return -1;
- }
-
- XBZRLE.current_buf = g_try_malloc(TARGET_PAGE_SIZE);
- if (!XBZRLE.current_buf) {
- error_report("Error allocating current_buf");
- g_free(XBZRLE.encoded_buf);
- XBZRLE.encoded_buf = NULL;
- return -1;
- }
-
- acct_clear();
- }
-
- /* iothread lock needed for ram_list.dirty_memory[] */
- qemu_mutex_lock_iothread();
- qemu_mutex_lock_ramlist();
- rcu_read_lock();
- bytes_transferred = 0;
- reset_ram_globals();
-
- ram_bitmap_pages = last_ram_offset() >> TARGET_PAGE_BITS;
- migration_bitmap = bitmap_new(ram_bitmap_pages);
- bitmap_set(migration_bitmap, 0, ram_bitmap_pages);
-
- /*
- * Count the total number of pages used by ram blocks not including any
- * gaps due to alignment or unplugs.
- */
- migration_dirty_pages = ram_bytes_total() >> TARGET_PAGE_BITS;
-
- memory_global_dirty_log_start();
- migration_bitmap_sync();
- qemu_mutex_unlock_ramlist();
- qemu_mutex_unlock_iothread();
-
- qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
projects / qemu.git / blobdiff