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migration/next for 20151110

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Merge remote-tracking branch 'remotes/juanquintela/tags/migration/20151110' into staging

migration/next for 20151110

# gpg: Signature made Tue 10 Nov 2015 14:23:26 GMT using RSA key ID 5872D723
# gpg: Good signature from "Juan Quintela <quintela@redhat.com>"
# gpg:                 aka "Juan Quintela <quintela@trasno.org>"

* remotes/juanquintela/tags/migration/20151110: (57 commits)
  migration: qemu_savevm_state_cleanup becomes mandatory operation
  Inhibit ballooning during postcopy
  Disable mlock around incoming postcopy
  End of migration for postcopy
  Postcopy: Mark nohugepage before discard
  postcopy: Wire up loadvm_postcopy_handle_ commands
  Start up a postcopy/listener thread ready for incoming page data
  Postcopy; Handle userfault requests
  Round up RAMBlock sizes to host page sizes
  Host page!=target page: Cleanup bitmaps
  Don't iterate on precopy-only devices during postcopy
  Don't sync dirty bitmaps in postcopy
  postcopy: Check order of received target pages
  Postcopy: Use helpers to map pages during migration
  postcopy_ram.c: place_page and helpers
  Page request: Consume pages off the post-copy queue
  Page request: Process incoming page request
  Page request: Add MIG_RP_MSG_REQ_PAGES reverse command
  Postcopy: End of iteration
  Postcopy: Postcopy startup in migration thread
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2015-11-10 17:49:39 +00:00
commit a77067f6ac
35 changed files with 4208 additions and 291 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/exec/cpu-common.h
View file

@ -64,8 +64,12 @@ typedef uint32_t CPUReadMemoryFunc(void *opaque, hwaddr addr);
void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
/* This should not be used by devices. */
MemoryRegion *qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr);
RAMBlock *qemu_ram_block_by_name(const char *name);
RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
ram_addr_t *ram_addr, ram_addr_t *offset);
void qemu_ram_set_idstr(ram_addr_t addr, const char *name, DeviceState *dev);
void qemu_ram_unset_idstr(ram_addr_t addr);
const char *qemu_ram_get_idstr(RAMBlock *rb);
void cpu_physical_memory_rw(hwaddr addr, uint8_t *buf,
int len, int is_write);

1
include/exec/exec-all.h
View file

@ -72,7 +72,6 @@ void restore_state_to_opc(CPUArchState *env, struct TranslationBlock *tb,
void cpu_gen_init(void);
bool cpu_restore_state(CPUState *cpu, uintptr_t searched_pc);
void page_size_init(void);
void QEMU_NORETURN cpu_resume_from_signal(CPUState *cpu, void *puc);
void QEMU_NORETURN cpu_io_recompile(CPUState *cpu, uintptr_t retaddr);

2
include/exec/ram_addr.h
View file

@ -22,8 +22,6 @@
#ifndef CONFIG_USER_ONLY
#include "hw/xen/xen.h"
typedef struct RAMBlock RAMBlock;
struct RAMBlock {
struct rcu_head rcu;
struct MemoryRegion *mr;

121
include/migration/migration.h
View file

@ -35,6 +35,7 @@
#define QEMU_VM_SUBSECTION 0x05
#define QEMU_VM_VMDESCRIPTION 0x06
#define QEMU_VM_CONFIGURATION 0x07
#define QEMU_VM_COMMAND 0x08
#define QEMU_VM_SECTION_FOOTER 0x7e
struct MigrationParams {
@ -42,13 +43,67 @@ struct MigrationParams {
bool shared;
};
typedef struct MigrationState MigrationState;
/* Messages sent on the return path from destination to source */
enum mig_rp_message_type {
MIG_RP_MSG_INVALID = 0, /* Must be 0 */
MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */
MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */
MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */
MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */
MIG_RP_MSG_MAX
};
typedef QLIST_HEAD(, LoadStateEntry) LoadStateEntry_Head;
/* The current postcopy state is read/set by postcopy_state_get/set
* which update it atomically.
* The state is updated as postcopy messages are received, and
* in general only one thread should be writing to the state at any one
* time, initially the main thread and then the listen thread;
* Corner cases are where either thread finishes early and/or errors.
* The state is checked as messages are received to ensure that
* the source is sending us messages in the correct order.
* The state is also used by the RAM reception code to know if it
* has to place pages atomically, and the cleanup code at the end of
* the main thread to know if it has to delay cleanup until the end
* of postcopy.
*/
typedef enum {
POSTCOPY_INCOMING_NONE = 0, /* Initial state - no postcopy */
POSTCOPY_INCOMING_ADVISE,
POSTCOPY_INCOMING_DISCARD,
POSTCOPY_INCOMING_LISTENING,
POSTCOPY_INCOMING_RUNNING,
POSTCOPY_INCOMING_END
} PostcopyState;
/* State for the incoming migration */
struct MigrationIncomingState {
QEMUFile *file;
QEMUFile *from_src_file;
/*
* Free at the start of the main state load, set as the main thread finishes
* loading state.
*/
QemuEvent main_thread_load_event;
bool have_fault_thread;
QemuThread fault_thread;
QemuSemaphore fault_thread_sem;
bool have_listen_thread;
QemuThread listen_thread;
QemuSemaphore listen_thread_sem;
/* For the kernel to send us notifications */
int userfault_fd;
/* To tell the fault_thread to quit */
int userfault_quit_fd;
QEMUFile *to_src_file;
QemuMutex rp_mutex; /* We send replies from multiple threads */
void *postcopy_tmp_page;
/* See savevm.c */
LoadStateEntry_Head loadvm_handlers;
@ -58,6 +113,18 @@ MigrationIncomingState *migration_incoming_get_current(void);
MigrationIncomingState *migration_incoming_state_new(QEMUFile *f);
void migration_incoming_state_destroy(void);
/*
* An outstanding page request, on the source, having been received
* and queued
*/
struct MigrationSrcPageRequest {
RAMBlock *rb;
hwaddr offset;
hwaddr len;
QSIMPLEQ_ENTRY(MigrationSrcPageRequest) next_req;
};
struct MigrationState
{
int64_t bandwidth_limit;
@ -70,6 +137,14 @@ struct MigrationState
int state;
MigrationParams params;
/* State related to return path */
struct {
QEMUFile *from_dst_file;
QemuThread rp_thread;
bool error;
} rp_state;
double mbps;
int64_t total_time;
int64_t downtime;
@ -80,6 +155,18 @@ struct MigrationState
int64_t xbzrle_cache_size;
int64_t setup_time;
int64_t dirty_sync_count;
/* Flag set once the migration has been asked to enter postcopy */
bool start_postcopy;
/* Flag set once the migration thread is running (and needs joining) */
bool migration_thread_running;
/* Queue of outstanding page requests from the destination */
QemuMutex src_page_req_mutex;
QSIMPLEQ_HEAD(src_page_requests, MigrationSrcPageRequest) src_page_requests;
/* The RAMBlock used in the last src_page_request */
RAMBlock *last_req_rb;
};
void process_incoming_migration(QEMUFile *f);
@ -116,9 +203,12 @@ int migrate_fd_close(MigrationState *s);
void add_migration_state_change_notifier(Notifier *notify);
void remove_migration_state_change_notifier(Notifier *notify);
MigrationState *migrate_init(const MigrationParams *params);
bool migration_in_setup(MigrationState *);
bool migration_has_finished(MigrationState *);
bool migration_has_failed(MigrationState *);
/* True if outgoing migration has entered postcopy phase */
bool migration_in_postcopy(MigrationState *);
MigrationState *migrate_get_current(void);
void migrate_compress_threads_create(void);
@ -145,6 +235,13 @@ uint64_t xbzrle_mig_pages_cache_miss(void);
double xbzrle_mig_cache_miss_rate(void);
void ram_handle_compressed(void *host, uint8_t ch, uint64_t size);
void ram_debug_dump_bitmap(unsigned long *todump, bool expected);
/* For outgoing discard bitmap */
int ram_postcopy_send_discard_bitmap(MigrationState *ms);
/* For incoming postcopy discard */
int ram_discard_range(MigrationIncomingState *mis, const char *block_name,
uint64_t start, size_t length);
int ram_postcopy_incoming_init(MigrationIncomingState *mis);
/**
* @migrate_add_blocker - prevent migration from proceeding
@ -160,6 +257,7 @@ void migrate_add_blocker(Error *reason);
*/
void migrate_del_blocker(Error *reason);
bool migrate_postcopy_ram(void);
bool migrate_zero_blocks(void);
bool migrate_auto_converge(void);
@ -179,6 +277,17 @@ int migrate_compress_threads(void);
int migrate_decompress_threads(void);
bool migrate_use_events(void);
/* Sending on the return path - generic and then for each message type */
void migrate_send_rp_message(MigrationIncomingState *mis,
enum mig_rp_message_type message_type,
uint16_t len, void *data);
void migrate_send_rp_shut(MigrationIncomingState *mis,
uint32_t value);
void migrate_send_rp_pong(MigrationIncomingState *mis,
uint32_t value);
void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname,
ram_addr_t start, size_t len);
void ram_control_before_iterate(QEMUFile *f, uint64_t flags);
void ram_control_after_iterate(QEMUFile *f, uint64_t flags);
void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data);
@ -204,4 +313,12 @@ void global_state_set_optional(void);
void savevm_skip_configuration(void);
int global_state_store(void);
void global_state_store_running(void);
void flush_page_queue(MigrationState *ms);
int ram_save_queue_pages(MigrationState *ms, const char *rbname,
ram_addr_t start, ram_addr_t len);
PostcopyState postcopy_state_get(void);
/* Set the state and return the old state */
PostcopyState postcopy_state_set(PostcopyState new_state);
#endif

99
include/migration/postcopy-ram.h Normal file
View file

@ -0,0 +1,99 @@
/*
* Postcopy migration for RAM
*
* Copyright 2013 Red Hat, Inc. and/or its affiliates
*
* Authors:
* Dave Gilbert <dgilbert@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#ifndef QEMU_POSTCOPY_RAM_H
#define QEMU_POSTCOPY_RAM_H
/* Return true if the host supports everything we need to do postcopy-ram */
bool postcopy_ram_supported_by_host(void);
/*
* Make all of RAM sensitive to accesses to areas that haven't yet been written
* and wire up anything necessary to deal with it.
*/
int postcopy_ram_enable_notify(MigrationIncomingState *mis);
/*
* Initialise postcopy-ram, setting the RAM to a state where we can go into
* postcopy later; must be called prior to any precopy.
* called from ram.c's similarly named ram_postcopy_incoming_init
*/
int postcopy_ram_incoming_init(MigrationIncomingState *mis, size_t ram_pages);
/*
* At the end of a migration where postcopy_ram_incoming_init was called.
*/
int postcopy_ram_incoming_cleanup(MigrationIncomingState *mis);
/*
* Discard the contents of 'length' bytes from 'start'
* We can assume that if we've been called postcopy_ram_hosttest returned true
*/
int postcopy_ram_discard_range(MigrationIncomingState *mis, uint8_t *start,
size_t length);
/*
* Userfault requires us to mark RAM as NOHUGEPAGE prior to discard
* however leaving it until after precopy means that most of the precopy
* data is still THPd
*/
int postcopy_ram_prepare_discard(MigrationIncomingState *mis);
/*
* Called at the start of each RAMBlock by the bitmap code.
* 'offset' is the bitmap offset of the named RAMBlock in the migration
* bitmap.
* Returns a new PDS
*/
PostcopyDiscardState *postcopy_discard_send_init(MigrationState *ms,
unsigned long offset,
const char *name);
/*
* Called by the bitmap code for each chunk to discard.
* May send a discard message, may just leave it queued to
* be sent later.
* @start,@length: a range of pages in the migration bitmap in the
* RAM block passed to postcopy_discard_send_init() (length=1 is one page)
*/
void postcopy_discard_send_range(MigrationState *ms, PostcopyDiscardState *pds,
unsigned long start, unsigned long length);
/*
* Called at the end of each RAMBlock by the bitmap code.
* Sends any outstanding discard messages, frees the PDS.
*/
void postcopy_discard_send_finish(MigrationState *ms,
PostcopyDiscardState *pds);
/*
* Place a page (from) at (host) efficiently
* There are restrictions on how 'from' must be mapped, in general best
* to use other postcopy_ routines to allocate.
* returns 0 on success
*/
int postcopy_place_page(MigrationIncomingState *mis, void *host, void *from);
/*
* Place a zero page at (host) atomically
* returns 0 on success
*/
int postcopy_place_page_zero(MigrationIncomingState *mis, void *host);
/*
* Allocate a page of memory that can be mapped at a later point in time
* using postcopy_place_page
* Returns: Pointer to allocated page
*/
void *postcopy_get_tmp_page(MigrationIncomingState *mis);
#endif

10
include/migration/qemu-file.h
View file

@ -88,6 +88,11 @@ typedef size_t (QEMURamSaveFunc)(QEMUFile *f, void *opaque,
size_t size,
uint64_t *bytes_sent);
/*
* Return a QEMUFile for comms in the opposite direction
*/
typedef QEMUFile *(QEMURetPathFunc)(void *opaque);
/*
* Stop any read or write (depending on flags) on the underlying
* transport on the QEMUFile.
@ -106,6 +111,7 @@ typedef struct QEMUFileOps {
QEMURamHookFunc *after_ram_iterate;
QEMURamHookFunc *hook_ram_load;
QEMURamSaveFunc *save_page;
QEMURetPathFunc *get_return_path;
QEMUFileShutdownFunc *shut_down;
} QEMUFileOps;
@ -163,9 +169,11 @@ void qemu_put_be32(QEMUFile *f, unsigned int v);
void qemu_put_be64(QEMUFile *f, uint64_t v);
size_t qemu_peek_buffer(QEMUFile *f, uint8_t **buf, size_t size, size_t offset);
size_t qemu_get_buffer(QEMUFile *f, uint8_t *buf, size_t size);
size_t qemu_get_buffer_in_place(QEMUFile *f, uint8_t **buf, size_t size);
ssize_t qemu_put_compression_data(QEMUFile *f, const uint8_t *p, size_t size,
int level);
int qemu_put_qemu_file(QEMUFile *f_des, QEMUFile *f_src);
/*
* Note that you can only peek continuous bytes from where the current pointer
* is; you aren't guaranteed to be able to peak to +n bytes unless you've
@ -194,7 +202,9 @@ int64_t qemu_file_get_rate_limit(QEMUFile *f);
int qemu_file_get_error(QEMUFile *f);
void qemu_file_set_error(QEMUFile *f, int ret);
int qemu_file_shutdown(QEMUFile *f);
QEMUFile *qemu_file_get_return_path(QEMUFile *f);
void qemu_fflush(QEMUFile *f);
void qemu_file_set_blocking(QEMUFile *f, bool block);
static inline void qemu_put_be64s(QEMUFile *f, const uint64_t *pv)
{

8
include/migration/vmstate.h
View file

@ -40,7 +40,8 @@ typedef struct SaveVMHandlers {
SaveStateHandler *save_state;
void (*cleanup)(void *opaque);
int (*save_live_complete)(QEMUFile *f, void *opaque);
int (*save_live_complete_postcopy)(QEMUFile *f, void *opaque);
int (*save_live_complete_precopy)(QEMUFile *f, void *opaque);
/* This runs both outside and inside the iothread lock. */
bool (*is_active)(void *opaque);
@ -54,8 +55,9 @@ typedef struct SaveVMHandlers {
/* This runs outside the iothread lock! */
int (*save_live_setup)(QEMUFile *f, void *opaque);
uint64_t (*save_live_pending)(QEMUFile *f, void *opaque, uint64_t max_size);
void (*save_live_pending)(QEMUFile *f, void *opaque, uint64_t max_size,
uint64_t *non_postcopiable_pending,
uint64_t *postcopiable_pending);
LoadStateHandler *load_state;
} SaveVMHandlers;

1
include/qemu-common.h
View file

@ -499,5 +499,6 @@ size_t buffer_find_nonzero_offset(const void *buf, size_t len);
int parse_debug_env(const char *name, int max, int initial);
const char *qemu_ether_ntoa(const MACAddr *mac);
void page_size_init(void);
#endif

9
include/qemu/osdep.h
View file

@ -139,6 +139,8 @@ void qemu_anon_ram_free(void *ptr, size_t size);
#if defined(CONFIG_MADVISE)
#include <sys/mman.h>
#define QEMU_MADV_WILLNEED MADV_WILLNEED
#define QEMU_MADV_DONTNEED MADV_DONTNEED
#ifdef MADV_DONTFORK
@ -171,6 +173,11 @@ void qemu_anon_ram_free(void *ptr, size_t size);
#else
#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
#endif
#ifdef MADV_NOHUGEPAGE
#define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
#else
#define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
#endif
#elif defined(CONFIG_POSIX_MADVISE)
@ -182,6 +189,7 @@ void qemu_anon_ram_free(void *ptr, size_t size);
#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
#define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
#else /* no-op */
@ -193,6 +201,7 @@ void qemu_anon_ram_free(void *ptr, size_t size);
#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
#define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
#endif

3
include/qemu/typedefs.h
View file

@ -44,6 +44,7 @@ typedef struct MemoryRegion MemoryRegion;
typedef struct MemoryRegionSection MemoryRegionSection;
typedef struct MigrationIncomingState MigrationIncomingState;
typedef struct MigrationParams MigrationParams;
typedef struct MigrationState MigrationState;
typedef struct Monitor Monitor;
typedef struct MouseTransformInfo MouseTransformInfo;
typedef struct MSIMessage MSIMessage;
@ -66,6 +67,7 @@ typedef struct PCMachineState PCMachineState;
typedef struct PCMachineClass PCMachineClass;
typedef struct PCMCIACardState PCMCIACardState;
typedef struct PixelFormat PixelFormat;
typedef struct PostcopyDiscardState PostcopyDiscardState;
typedef struct PropertyInfo PropertyInfo;
typedef struct Property Property;
typedef struct QEMUBH QEMUBH;
@ -79,6 +81,7 @@ typedef struct QEMUSizedBuffer QEMUSizedBuffer;
typedef struct QEMUTimerListGroup QEMUTimerListGroup;
typedef struct QEMUTimer QEMUTimer;
typedef struct Range Range;
typedef struct RAMBlock RAMBlock;
typedef struct SerialState SerialState;
typedef struct SHPCDevice SHPCDevice;
typedef struct SMBusDevice SMBusDevice;

2
include/sysemu/balloon.h
View file

@ -22,5 +22,7 @@ typedef void (QEMUBalloonStatus)(void *opaque, BalloonInfo *info);
int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
QEMUBalloonStatus *stat_func, void *opaque);
void qemu_remove_balloon_handler(void *opaque);
bool qemu_balloon_is_inhibited(void);
void qemu_balloon_inhibit(bool state);
#endif

46
include/sysemu/sysemu.h
View file

@ -70,6 +70,7 @@ void qemu_system_killed(int signal, pid_t pid);
void qemu_devices_reset(void);
void qemu_system_reset(bool report);
void qemu_system_guest_panicked(void);
size_t qemu_target_page_bits(void);
void qemu_add_exit_notifier(Notifier *notify);
void qemu_remove_exit_notifier(Notifier *notify);
@ -83,14 +84,52 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict);
void qemu_announce_self(void);
/* Subcommands for QEMU_VM_COMMAND */
enum qemu_vm_cmd {
MIG_CMD_INVALID = 0, /* Must be 0 */
MIG_CMD_OPEN_RETURN_PATH, /* Tell the dest to open the Return path */
MIG_CMD_PING, /* Request a PONG on the RP */
MIG_CMD_POSTCOPY_ADVISE, /* Prior to any page transfers, just
warn we might want to do PC */
MIG_CMD_POSTCOPY_LISTEN, /* Start listening for incoming
pages as it's running. */
MIG_CMD_POSTCOPY_RUN, /* Start execution */
MIG_CMD_POSTCOPY_RAM_DISCARD, /* A list of pages to discard that
were previously sent during
precopy but are dirty. */
MIG_CMD_PACKAGED, /* Send a wrapped stream within this stream */
MIG_CMD_MAX
};
#define MAX_VM_CMD_PACKAGED_SIZE (1ul << 24)
bool qemu_savevm_state_blocked(Error **errp);
void qemu_savevm_state_begin(QEMUFile *f,
const MigrationParams *params);
void qemu_savevm_state_header(QEMUFile *f);
int qemu_savevm_state_iterate(QEMUFile *f);
void qemu_savevm_state_complete(QEMUFile *f);
int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy);
void qemu_savevm_state_cleanup(void);
uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size);
void qemu_savevm_state_complete_postcopy(QEMUFile *f);
void qemu_savevm_state_complete_precopy(QEMUFile *f);
void qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size,
uint64_t *res_non_postcopiable,
uint64_t *res_postcopiable);
void qemu_savevm_command_send(QEMUFile *f, enum qemu_vm_cmd command,
uint16_t len, uint8_t *data);
void qemu_savevm_send_ping(QEMUFile *f, uint32_t value);
void qemu_savevm_send_open_return_path(QEMUFile *f);
int qemu_savevm_send_packaged(QEMUFile *f, const QEMUSizedBuffer *qsb);
void qemu_savevm_send_postcopy_advise(QEMUFile *f);
void qemu_savevm_send_postcopy_listen(QEMUFile *f);
void qemu_savevm_send_postcopy_run(QEMUFile *f);
void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name,
uint16_t len,
uint64_t *start_list,
uint64_t *length_list);
int qemu_loadvm_state(QEMUFile *f);
typedef enum DisplayType
@ -133,6 +172,7 @@ extern int boot_menu;
extern bool boot_strict;
extern uint8_t *boot_splash_filedata;
extern size_t boot_splash_filedata_size;
extern bool enable_mlock;
extern uint8_t qemu_extra_params_fw[2];
extern QEMUClockType rtc_clock;
extern const char *mem_path;