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-rw-r--r--arch_init.c1588
1 files changed, 0 insertions, 1588 deletions
diff --git a/arch_init.c b/arch_init.c
index d29447497b..63c44d379a 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -55,14 +55,6 @@
#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;
@@ -111,24 +103,6 @@ int graphic_depth = 32;
#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;
@@ -139,8 +113,6 @@ static struct defconfig_file {
{ NULL }, /* end of list */
};
-static const uint8_t ZERO_TARGET_PAGE[TARGET_PAGE_SIZE];
-
int qemu_read_default_config_files(bool userconfig)
{
int ret;
@@ -159,1517 +131,6 @@ int qemu_read_default_config_files(bool userconfig)
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(&param->mutex);
- /* Re-check the quit_comp_thread in case of
- * terminate_compression_threads is called just before
- * qemu_mutex_lock(&param->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(&param->cond, &param->mutex);
- }
- if (!quit_comp_thread) {
- do_compress_ram_page(param);
- }
- param->start = false;
- qemu_mutex_unlock(&param->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 void migration_bitmap_sync_range(ram_addr_t start, ram_addr_t length)
-{
- migration_dirty_pages +=
- cpu_physical_memory_sync_dirty_bitmap(migration_bitmap, start, length);
-}
-
-
-/* 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(&param->mutex);
- param->start = true;
- qemu_cond_signal(&param->cond);
- qemu_mutex_unlock(&param->mutex);
-}
-
-static inline void start_decompression(DecompressParam *param)
-{
- qemu_mutex_lock(&param->mutex);
- param->start = true;
- qemu_cond_signal(&param->cond);
- qemu_mutex_unlock(&param->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);
-
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
- qemu_put_byte(f, strlen(block->idstr));
- qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
- qemu_put_be64(f, block->used_length);
- }
-
- rcu_read_unlock();
-
- ram_control_before_iterate(f, RAM_CONTROL_SETUP);
- ram_control_after_iterate(f, RAM_CONTROL_SETUP);
-
- qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
-
- return 0;
-}
-
-static int ram_save_iterate(QEMUFile *f, void *opaque)
-{
- int ret;
- int i;
- int64_t t0;
- int pages_sent = 0;
-
- rcu_read_lock();
- if (ram_list.version != last_version) {
- reset_ram_globals();
- }
-
- /* Read version before ram_list.blocks */
- smp_rmb();
-
- ram_control_before_iterate(f, RAM_CONTROL_ROUND);
-
- t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
- i = 0;
- while ((ret = qemu_file_rate_limit(f)) == 0) {
- int pages;
-
- pages = ram_find_and_save_block(f, false, &bytes_transferred);
- /* no more pages to sent */
- if (pages == 0) {
- break;
- }
- pages_sent += pages;
- acct_info.iterations++;
- check_guest_throttling();
- /* we want to check in the 1st loop, just in case it was the 1st time
- and we had to sync the dirty bitmap.
- qemu_get_clock_ns() is a bit expensive, so we only check each some
- iterations
- */
- if ((i & 63) == 0) {
- uint64_t t1 = (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - t0) / 1000000;
- if (t1 > MAX_WAIT) {
- DPRINTF("big wait: %" PRIu64 " milliseconds, %d iterations\n",
- t1, i);
- break;
- }
- }
- i++;
- }
- flush_compressed_data(f);
- rcu_read_unlock();
-
- /*
- * Must occur before EOS (or any QEMUFile operation)
- * because of RDMA protocol.
- */
- ram_control_after_iterate(f, RAM_CONTROL_ROUND);
-
- qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
- bytes_transferred += 8;
-
- ret = qemu_file_get_error(f);
- if (ret < 0) {
- return ret;
- }
-
- return pages_sent;
-}
-
-/* Called with iothread lock */
-static int ram_save_complete(QEMUFile *f, void *opaque)
-{
- rcu_read_lock();
-
- migration_bitmap_sync();
-
- ram_control_before_iterate(f, RAM_CONTROL_FINISH);
-
- /* try transferring iterative blocks of memory */
-
- /* flush all remaining blocks regardless of rate limiting */
- while (true) {
- int pages;
-
- pages = ram_find_and_save_block(f, true, &bytes_transferred);
- /* no more blocks to sent */
- if (pages == 0) {
- break;
- }
- }
-
- flush_compressed_data(f);
- ram_control_after_iterate(f, RAM_CONTROL_FINISH);
- migration_end();
-
- rcu_read_unlock();
- qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
-
- return 0;
-}
-
-static uint64_t ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size)
-{
- uint64_t remaining_size;
-
- remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
-
- if (remaining_size < max_size) {
- qemu_mutex_lock_iothread();
- rcu_read_lock();
- migration_bitmap_sync();
- rcu_read_unlock();
- qemu_mutex_unlock_iothread();
- remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
- }
- return remaining_size;
-}
-
-static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
-{
- unsigned int xh_len;
- int xh_flags;
-
- if (!xbzrle_decoded_buf) {
- xbzrle_decoded_buf = g_malloc(TARGET_PAGE_SIZE);
- }
-
- /* extract RLE header */
- xh_flags = qemu_get_byte(f);
- xh_len = qemu_get_be16(f);
-
- if (xh_flags != ENCODING_FLAG_XBZRLE) {
- error_report("Failed to load XBZRLE page - wrong compression!");
- return -1;
- }
-
- if (xh_len > TARGET_PAGE_SIZE) {
- error_report("Failed to load XBZRLE page - len overflow!");
- return -1;
- }
- /* load data and decode */
- qemu_get_buffer(f, xbzrle_decoded_buf, xh_len);
-
- /* decode RLE */
- if (xbzrle_decode_buffer(xbzrle_decoded_buf, xh_len, host,
- TARGET_PAGE_SIZE) == -1) {
- error_report("Failed to load XBZRLE page - decode error!");
- return -1;
- }
-
- return 0;
-}
-
-/* Must be called from within a rcu critical section.
- * Returns a pointer from within the RCU-protected ram_list.
- */
-static inline void *host_from_stream_offset(QEMUFile *f,
- ram_addr_t offset,
- int flags)
-{
- static RAMBlock *block = NULL;
- char id[256];
- uint8_t len;
-
- if (flags & RAM_SAVE_FLAG_CONTINUE) {
- if (!block || block->max_length <= offset) {
- error_report("Ack, bad migration stream!");
- return NULL;
- }
-
- return memory_region_get_ram_ptr(block->mr) + offset;
- }
-
- len = qemu_get_byte(f);
- qemu_get_buffer(f, (uint8_t *)id, len);
- id[len] = 0;
-
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
- if (!strncmp(id, block->idstr, sizeof(id)) &&
- block->max_length > offset) {
- return memory_region_get_ram_ptr(block->mr) + offset;
- }
- }
-
- error_report("Can't find block %s!", id);
- return NULL;
-}
-
-/*
- * If a page (or a whole RDMA chunk) has been
- * determined to be zero, then zap it.
- */
-void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
-{
- if (ch != 0 || !is_zero_range(host, size)) {
- memset(host, ch, size);
- }
-}
-
-static void *do_data_decompress(void *opaque)
-{
- DecompressParam *param = opaque;
- unsigned long pagesize;
-
- while (!quit_decomp_thread) {
- qemu_mutex_lock(&param->mutex);
- while (!param->start && !quit_decomp_thread) {
- qemu_cond_wait(&param->cond, &param->mutex);
- pagesize = TARGET_PAGE_SIZE;
- if (!quit_decomp_thread) {
- /* uncompress() will return failed in some case, especially
- * when the page is dirted when doing the compression, it's
- * not a problem because the dirty page will be retransferred
- * and uncompress() won't break the data in other pages.
- */
- uncompress((Bytef *)param->des, &pagesize,
- (const Bytef *)param->compbuf, param->len);
- }
- param->start = false;
- }
- qemu_mutex_unlock(&param->mutex);
- }
-
- return NULL;
-}
-
-void migrate_decompress_threads_create(void)
-{
- int i, thread_count;
-
- thread_count = migrate_decompress_threads();
- decompress_threads = g_new0(QemuThread, thread_count);
- decomp_param = g_new0(DecompressParam, thread_count);
- compressed_data_buf = g_malloc0(compressBound(TARGET_PAGE_SIZE));
- quit_decomp_thread = false;
- for (i = 0; i < thread_count; i++) {
- qemu_mutex_init(&decomp_param[i].mutex);
- qemu_cond_init(&decomp_param[i].cond);
- decomp_param[i].compbuf = g_malloc0(compressBound(TARGET_PAGE_SIZE));
- qemu_thread_create(decompress_threads + i, "decompress",
- do_data_decompress, decomp_param + i,
- QEMU_THREAD_JOINABLE);
- }
-}
-
-void migrate_decompress_threads_join(void)
-{
- int i, thread_count;
-
- quit_decomp_thread = true;
- thread_count = migrate_decompress_threads();
- for (i = 0; i < thread_count; i++) {
- qemu_mutex_lock(&decomp_param[i].mutex);
- qemu_cond_signal(&decomp_param[i].cond);
- qemu_mutex_unlock(&decomp_param[i].mutex);
- }
- for (i = 0; i < thread_count; i++) {
- qemu_thread_join(decompress_threads + i);
- qemu_mutex_destroy(&decomp_param[i].mutex);
- qemu_cond_destroy(&decomp_param[i].cond);
- g_free(decomp_param[i].compbuf);
- }
- g_free(decompress_threads);
- g_free(decomp_param);
- g_free(compressed_data_buf);
- decompress_threads = NULL;
- decomp_param = NULL;
- compressed_data_buf = NULL;
-}
-
-static void decompress_data_with_multi_threads(uint8_t *compbuf,
- void *host, int len)
-{
- int idx, thread_count;
-
- thread_count = migrate_decompress_threads();
- while (true) {
- for (idx = 0; idx < thread_count; idx++) {
- if (!decomp_param[idx].start) {
- memcpy(decomp_param[idx].compbuf, compbuf, len);
- decomp_param[idx].des = host;
- decomp_param[idx].len = len;
- start_decompression(&decomp_param[idx]);
- break;
- }
- }
- if (idx < thread_count) {
- break;
- }
- }
-}
-
-static int ram_load(QEMUFile *f, void *opaque, int version_id)
-{
- int flags = 0, ret = 0;
- static uint64_t seq_iter;
- int len = 0;
-
- seq_iter++;
-
- if (version_id != 4) {
- ret = -EINVAL;
- }
-
- /* This RCU critical section can be very long running.
- * When RCU reclaims in the code start to become numerous,
- * it will be necessary to reduce the granularity of this
- * critical section.
- */
- rcu_read_lock();
- while (!ret && !(flags & RAM_SAVE_FLAG_EOS)) {
- ram_addr_t addr, total_ram_bytes;
- void *host;
- uint8_t ch;
-
- addr = qemu_get_be64(f);
- flags = addr & ~TARGET_PAGE_MASK;
- addr &= TARGET_PAGE_MASK;
-
- switch (flags & ~RAM_SAVE_FLAG_CONTINUE) {
- case RAM_SAVE_FLAG_MEM_SIZE:
- /* Synchronize RAM block list */
- total_ram_bytes = addr;
- while (!ret && total_ram_bytes) {
- RAMBlock *block;
- uint8_t len;
- char id[256];
- ram_addr_t length;
-
- len = qemu_get_byte(f);
- qemu_get_buffer(f, (uint8_t *)id, len);
- id[len] = 0;
- length = qemu_get_be64(f);
-
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
- if (!strncmp(id, block->idstr, sizeof(id))) {
- if (length != block->used_length) {
- Error *local_err = NULL;
-
- ret = qemu_ram_resize(block->offset, length, &local_err);
- if (local_err) {
- error_report_err(local_err);
- }
- }
- break;
- }
- }
-
- if (!block) {
- error_report("Unknown ramblock \"%s\", cannot "
- "accept migration", id);
- ret = -EINVAL;
- }
-
- total_ram_bytes -= length;
- }
- break;
- case RAM_SAVE_FLAG_COMPRESS:
- host = host_from_stream_offset(f, addr, flags);
- if (!host) {
- error_report("Illegal RAM offset " RAM_ADDR_FMT, addr);
- ret = -EINVAL;
- break;
- }
- ch = qemu_get_byte(f);
- ram_handle_compressed(host, ch, TARGET_PAGE_SIZE);
- break;
- case RAM_SAVE_FLAG_PAGE:
- host = host_from_stream_offset(f, addr, flags);
- if (!host) {
- error_report("Illegal RAM offset " RAM_ADDR_FMT, addr);
- ret = -EINVAL;
- break;
- }
- qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
- break;
- case RAM_SAVE_FLAG_COMPRESS_PAGE:
- host = host_from_stream_offset(f, addr, flags);
- if (!host) {
- error_report("Invalid RAM offset " RAM_ADDR_FMT, addr);
- ret = -EINVAL;
- break;
- }
-
- len = qemu_get_be32(f);
- if (len < 0 || len > compressBound(TARGET_PAGE_SIZE)) {
- error_report("Invalid compressed data length: %d", len);
- ret = -EINVAL;
- break;
- }
- qemu_get_buffer(f, compressed_data_buf, len);
- decompress_data_with_multi_threads(compressed_data_buf, host, len);
- break;
- case RAM_SAVE_FLAG_XBZRLE:
- host = host_from_stream_offset(f, addr, flags);
- if (!host) {
- error_report("Illegal RAM offset " RAM_ADDR_FMT, addr);
- ret = -EINVAL;
- break;
- }
- if (load_xbzrle(f, addr, host) < 0) {
- error_report("Failed to decompress XBZRLE page at "
- RAM_ADDR_FMT, addr);
- ret = -EINVAL;
- break;
- }
- break;
- case RAM_SAVE_FLAG_EOS:
- /* normal exit */
- break;
- default:
- if (flags & RAM_SAVE_FLAG_HOOK) {
- ram_control_load_hook(f, flags);
- } else {
- error_report("Unknown combination of migration flags: %#x",
- flags);
- ret = -EINVAL;
- }
- }
- if (!ret) {
- ret = qemu_file_get_error(f);
- }
- }
-
- rcu_read_unlock();
- DPRINTF("Completed load of VM with exit code %d seq iteration "
- "%" PRIu64 "\n", ret, seq_iter);
- return ret;
-}
-
-static SaveVMHandlers savevm_ram_handlers = {
- .save_live_setup = ram_save_setup,
- .save_live_iterate = ram_save_iterate,
- .save_live_complete = ram_save_complete,
- .save_live_pending = ram_save_pending,
- .load_state = ram_load,
- .cancel = ram_migration_cancel,
-};
-
-void ram_mig_init(void)
-{
- qemu_mutex_init(&XBZRLE.lock);
- register_savevm_live(NULL, "ram", 0, 4, &savevm_ram_handlers, NULL);
-}
-
struct soundhw {
const char *name;
const char *descr;
@@ -1869,52 +330,3 @@ TargetInfo *qmp_query_target(Error **errp)
return info;
}
-
-/* Stub function that's gets run on the vcpu when its brought out of the
- VM to run inside qemu via async_run_on_cpu()*/
-static void mig_sleep_cpu(void *opq)
-{
- qemu_mutex_unlock_iothread();
- g_usleep(30*1000);
- qemu_mutex_lock_iothread();
-}
-
-/* To reduce the dirty rate explicitly disallow the VCPUs from spending
- much time in the VM. The migration thread will try to catchup.
- Workload will experience a performance drop.
-*/
-static void mig_throttle_guest_down(void)
-{
- CPUState *cpu;
-
- qemu_mutex_lock_iothread();
- CPU_FOREACH(cpu) {
- async_run_on_cpu(cpu, mig_sleep_cpu, NULL);
- }
- qemu_mutex_unlock_iothread();
-}
-
-static void check_guest_throttling(void)
-{
- static int64_t t0;
- int64_t t1;
-
- if (!mig_throttle_on) {
- return;
- }
-
- if (!t0) {
- t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
- return;
- }
-
- t1 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
-
- /* If it has been more than 40 ms since the last time the guest
- * was throttled then do it again.
- */
- if (40 < (t1-t0)/1000000) {
- mig_throttle_guest_down();
- t0 = t1;
- }
-}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-13 20:24:45 +0000