Rename the macros to make them consistent with the MIGRATION_OBJ macro name. This will make future conversion to OBJECT_DECLARE* easier. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Tested-By: Roman Bolshakov <r.bolshakov@yadro.com> Message-Id: <20200825192110.3528606-51-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
355 lines
11 KiB
C
355 lines
11 KiB
C
/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_MIGRATION_H
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#define QEMU_MIGRATION_H
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#include "exec/cpu-common.h"
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#include "hw/qdev-core.h"
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#include "qapi/qapi-types-migration.h"
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#include "qemu/thread.h"
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#include "qemu/coroutine_int.h"
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#include "io/channel.h"
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#include "net/announce.h"
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struct PostcopyBlocktimeContext;
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#define MIGRATION_RESUME_ACK_VALUE (1)
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/*
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* 1<<6=64 pages -> 256K chunk when page size is 4K. This gives us
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* the benefit that all the chunks are 64 pages aligned then the
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* bitmaps are always aligned to LONG.
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*/
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#define CLEAR_BITMAP_SHIFT_MIN 6
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/*
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* 1<<18=256K pages -> 1G chunk when page size is 4K. This is the
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* default value to use if no one specified.
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*/
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#define CLEAR_BITMAP_SHIFT_DEFAULT 18
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/*
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* 1<<31=2G pages -> 8T chunk when page size is 4K. This should be
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* big enough and make sure we won't overflow easily.
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*/
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#define CLEAR_BITMAP_SHIFT_MAX 31
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/* State for the incoming migration */
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struct MigrationIncomingState {
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QEMUFile *from_src_file;
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/*
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* Free at the start of the main state load, set as the main thread finishes
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* loading state.
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*/
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QemuEvent main_thread_load_event;
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/* For network announces */
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AnnounceTimer announce_timer;
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size_t largest_page_size;
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bool have_fault_thread;
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QemuThread fault_thread;
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QemuSemaphore fault_thread_sem;
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/* Set this when we want the fault thread to quit */
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bool fault_thread_quit;
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bool have_listen_thread;
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QemuThread listen_thread;
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QemuSemaphore listen_thread_sem;
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/* For the kernel to send us notifications */
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int userfault_fd;
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/* To notify the fault_thread to wake, e.g., when need to quit */
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int userfault_event_fd;
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QEMUFile *to_src_file;
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QemuMutex rp_mutex; /* We send replies from multiple threads */
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/* RAMBlock of last request sent to source */
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RAMBlock *last_rb;
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void *postcopy_tmp_page;
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void *postcopy_tmp_zero_page;
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/* PostCopyFD's for external userfaultfds & handlers of shared memory */
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GArray *postcopy_remote_fds;
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QEMUBH *bh;
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int state;
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bool have_colo_incoming_thread;
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QemuThread colo_incoming_thread;
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/* The coroutine we should enter (back) after failover */
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Coroutine *migration_incoming_co;
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QemuSemaphore colo_incoming_sem;
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/*
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* PostcopyBlocktimeContext to keep information for postcopy
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* live migration, to calculate vCPU block time
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* */
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struct PostcopyBlocktimeContext *blocktime_ctx;
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/* notify PAUSED postcopy incoming migrations to try to continue */
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bool postcopy_recover_triggered;
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QemuSemaphore postcopy_pause_sem_dst;
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QemuSemaphore postcopy_pause_sem_fault;
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/* List of listening socket addresses */
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SocketAddressList *socket_address_list;
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};
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MigrationIncomingState *migration_incoming_get_current(void);
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void migration_incoming_state_destroy(void);
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/*
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* Functions to work with blocktime context
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*/
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void fill_destination_postcopy_migration_info(MigrationInfo *info);
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#define TYPE_MIGRATION "migration"
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#define MIGRATION_OBJ_CLASS(klass) \
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OBJECT_CLASS_CHECK(MigrationClass, (klass), TYPE_MIGRATION)
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#define MIGRATION_OBJ(obj) \
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OBJECT_CHECK(MigrationState, (obj), TYPE_MIGRATION)
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#define MIGRATION_OBJ_GET_CLASS(obj) \
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OBJECT_GET_CLASS(MigrationClass, (obj), TYPE_MIGRATION)
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typedef struct MigrationClass {
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/*< private >*/
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DeviceClass parent_class;
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} MigrationClass;
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struct MigrationState
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{
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/*< private >*/
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DeviceState parent_obj;
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/*< public >*/
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QemuThread thread;
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QEMUBH *cleanup_bh;
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QEMUFile *to_dst_file;
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/*
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* Protects to_dst_file pointer. We need to make sure we won't
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* yield or hang during the critical section, since this lock will
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* be used in OOB command handler.
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*/
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QemuMutex qemu_file_lock;
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/*
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* Used to allow urgent requests to override rate limiting.
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*/
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QemuSemaphore rate_limit_sem;
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/* pages already send at the beginning of current iteration */
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uint64_t iteration_initial_pages;
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/* pages transferred per second */
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double pages_per_second;
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/* bytes already send at the beginning of current iteration */
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uint64_t iteration_initial_bytes;
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/* time at the start of current iteration */
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int64_t iteration_start_time;
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/*
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* The final stage happens when the remaining data is smaller than
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* this threshold; it's calculated from the requested downtime and
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* measured bandwidth
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*/
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int64_t threshold_size;
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/* params from 'migrate-set-parameters' */
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MigrationParameters parameters;
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int state;
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/* State related to return path */
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struct {
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QEMUFile *from_dst_file;
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QemuThread rp_thread;
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bool error;
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QemuSemaphore rp_sem;
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} rp_state;
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double mbps;
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/* Timestamp when recent migration starts (ms) */
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int64_t start_time;
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/* Total time used by latest migration (ms) */
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int64_t total_time;
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/* Timestamp when VM is down (ms) to migrate the last stuff */
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int64_t downtime_start;
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int64_t downtime;
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int64_t expected_downtime;
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bool enabled_capabilities[MIGRATION_CAPABILITY__MAX];
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int64_t setup_time;
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/*
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* Whether guest was running when we enter the completion stage.
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* If migration is interrupted by any reason, we need to continue
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* running the guest on source.
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*/
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bool vm_was_running;
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/* Flag set once the migration has been asked to enter postcopy */
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bool start_postcopy;
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/* Flag set after postcopy has sent the device state */
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bool postcopy_after_devices;
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/* Flag set once the migration thread is running (and needs joining) */
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bool migration_thread_running;
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/* Flag set once the migration thread called bdrv_inactivate_all */
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bool block_inactive;
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/* Migration is waiting for guest to unplug device */
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QemuSemaphore wait_unplug_sem;
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/* Migration is paused due to pause-before-switchover */
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QemuSemaphore pause_sem;
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/* The semaphore is used to notify COLO thread that failover is finished */
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QemuSemaphore colo_exit_sem;
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/* The event is used to notify COLO thread to do checkpoint */
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QemuEvent colo_checkpoint_event;
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int64_t colo_checkpoint_time;
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QEMUTimer *colo_delay_timer;
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/* The first error that has occurred.
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We used the mutex to be able to return the 1st error message */
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Error *error;
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/* mutex to protect errp */
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QemuMutex error_mutex;
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/* Do we have to clean up -b/-i from old migrate parameters */
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/* This feature is deprecated and will be removed */
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bool must_remove_block_options;
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/*
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* Global switch on whether we need to store the global state
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* during migration.
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*/
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bool store_global_state;
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/* Whether we send QEMU_VM_CONFIGURATION during migration */
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bool send_configuration;
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/* Whether we send section footer during migration */
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bool send_section_footer;
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/* Needed by postcopy-pause state */
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QemuSemaphore postcopy_pause_sem;
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QemuSemaphore postcopy_pause_rp_sem;
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/*
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* Whether we abort the migration if decompression errors are
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* detected at the destination. It is left at false for qemu
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* older than 3.0, since only newer qemu sends streams that
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* do not trigger spurious decompression errors.
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*/
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bool decompress_error_check;
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/*
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* This decides the size of guest memory chunk that will be used
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* to track dirty bitmap clearing. The size of memory chunk will
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* be GUEST_PAGE_SIZE << N. Say, N=0 means we will clear dirty
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* bitmap for each page to send (1<<0=1); N=10 means we will clear
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* dirty bitmap only once for 1<<10=1K continuous guest pages
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* (which is in 4M chunk).
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*/
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uint8_t clear_bitmap_shift;
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};
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void migrate_set_state(int *state, int old_state, int new_state);
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void migration_fd_process_incoming(QEMUFile *f, Error **errp);
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void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp);
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void migration_incoming_process(void);
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bool migration_has_all_channels(void);
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uint64_t migrate_max_downtime(void);
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void migrate_set_error(MigrationState *s, const Error *error);
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void migrate_fd_error(MigrationState *s, const Error *error);
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void migrate_fd_connect(MigrationState *s, Error *error_in);
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bool migration_is_setup_or_active(int state);
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bool migration_is_running(int state);
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void migrate_init(MigrationState *s);
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bool migration_is_blocked(Error **errp);
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/* True if outgoing migration has entered postcopy phase */
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bool migration_in_postcopy(void);
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MigrationState *migrate_get_current(void);
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bool migrate_postcopy(void);
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bool migrate_release_ram(void);
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bool migrate_postcopy_ram(void);
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bool migrate_zero_blocks(void);
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bool migrate_dirty_bitmaps(void);
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bool migrate_ignore_shared(void);
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bool migrate_validate_uuid(void);
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bool migrate_auto_converge(void);
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bool migrate_use_multifd(void);
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bool migrate_pause_before_switchover(void);
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int migrate_multifd_channels(void);
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MultiFDCompression migrate_multifd_compression(void);
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int migrate_multifd_zlib_level(void);
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int migrate_multifd_zstd_level(void);
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int migrate_use_xbzrle(void);
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int64_t migrate_xbzrle_cache_size(void);
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bool migrate_colo_enabled(void);
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bool migrate_use_block(void);
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bool migrate_use_block_incremental(void);
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int migrate_max_cpu_throttle(void);
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bool migrate_use_return_path(void);
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uint64_t ram_get_total_transferred_pages(void);
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bool migrate_use_compression(void);
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int migrate_compress_level(void);
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int migrate_compress_threads(void);
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int migrate_compress_wait_thread(void);
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int migrate_decompress_threads(void);
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bool migrate_use_events(void);
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bool migrate_postcopy_blocktime(void);
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/* Sending on the return path - generic and then for each message type */
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void migrate_send_rp_shut(MigrationIncomingState *mis,
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uint32_t value);
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void migrate_send_rp_pong(MigrationIncomingState *mis,
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uint32_t value);
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int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname,
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ram_addr_t start, size_t len);
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void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis,
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char *block_name);
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void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value);
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void dirty_bitmap_mig_before_vm_start(void);
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void dirty_bitmap_mig_cancel_outgoing(void);
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void dirty_bitmap_mig_cancel_incoming(void);
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bool check_dirty_bitmap_mig_alias_map(const BitmapMigrationNodeAliasList *bbm,
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Error **errp);
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void migrate_add_address(SocketAddress *address);
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int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque);
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#define qemu_ram_foreach_block \
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#warning "Use foreach_not_ignored_block in migration code"
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void migration_make_urgent_request(void);
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void migration_consume_urgent_request(void);
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bool migration_rate_limit(void);
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#endif
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