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Re: [Qemu-devel] [PATCH v2 2/4] migration: Introduce ignore-shared capab
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From: |
Dr. David Alan Gilbert |
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Subject: |
Re: [Qemu-devel] [PATCH v2 2/4] migration: Introduce ignore-shared capability |
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Date: |
Mon, 11 Feb 2019 15:55:05 +0000 |
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User-agent: |
Mutt/1.10.1 (2018-07-13) |
* Yury Kotov (address@hidden) wrote:
> 11.02.2019, 15:45, "Dr. David Alan Gilbert" <address@hidden>:
> > * Yury Kotov (address@hidden) wrote:
> >> We want to use local migration to update QEMU for running guests.
> >> In this case we don't need to migrate shared (file backed) RAM.
> >> So, add a capability to ignore such blocks during live migration.
> >>
> >> Also, move qemu_ram_foreach_migratable_block (and rename) to the
> >> migration code, because it requires access to the migration capabilities.
> >>
> >> Signed-off-by: Yury Kotov <address@hidden>
> >
> > You could split this patch into the one that introduces the capability
> > and then the one that wires it up. We could also remove the x- at some
> > point.
>
> I.e. the patch that just adds the capability to json (and migrate_use_*), but
> nothing more, and the second one which actually realize the capability?
Right.
Dave
> Like this:
> 2a4c42f18c migration: add postcopy blocktime ctx into MigrationIncomingState
> f22f928ec9 migration: introduce postcopy-blocktime capability
> ?
>
> >
> > Reviewed-by: Dr. David Alan Gilbert <address@hidden>
> >
> >> ---
> >> exec.c | 19 -------
> >> include/exec/cpu-common.h | 1 -
> >> migration/migration.c | 9 ++++
> >> migration/migration.h | 5 +-
> >> migration/postcopy-ram.c | 12 ++---
> >> migration/ram.c | 110 +++++++++++++++++++++++++++++---------
> >> migration/rdma.c | 2 +-
> >> qapi/migration.json | 5 +-
> >> stubs/ram-block.c | 15 ++++++
> >> 9 files changed, 123 insertions(+), 55 deletions(-)
> >>
> >> diff --git a/exec.c b/exec.c
> >> index a61d501568..91bfe5fb62 100644
> >> --- a/exec.c
> >> +++ b/exec.c
> >> @@ -3984,25 +3984,6 @@ int qemu_ram_foreach_block(RAMBlockIterFunc func,
> >> void *opaque)
> >> return ret;
> >> }
> >>
> >> -int qemu_ram_foreach_migratable_block(RAMBlockIterFunc func, void
> >> *opaque)
> >> -{
> >> - RAMBlock *block;
> >> - int ret = 0;
> >> -
> >> - rcu_read_lock();
> >> - RAMBLOCK_FOREACH(block) {
> >> - if (!qemu_ram_is_migratable(block)) {
> >> - continue;
> >> - }
> >> - ret = func(block, opaque);
> >> - if (ret) {
> >> - break;
> >> - }
> >> - }
> >> - rcu_read_unlock();
> >> - return ret;
> >> -}
> >> -
> >> /*
> >> * Unmap pages of memory from start to start+length such that
> >> * they a) read as 0, b) Trigger whatever fault mechanism
> >> diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
> >> index bdae5446d7..403463d7bb 100644
> >> --- a/include/exec/cpu-common.h
> >> +++ b/include/exec/cpu-common.h
> >> @@ -122,7 +122,6 @@ extern struct MemoryRegion io_mem_notdirty;
> >> typedef int (RAMBlockIterFunc)(RAMBlock *rb, void *opaque);
> >>
> >> int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque);
> >> -int qemu_ram_foreach_migratable_block(RAMBlockIterFunc func, void
> >> *opaque);
> >> int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length);
> >>
> >> #endif
> >> diff --git a/migration/migration.c b/migration/migration.c
> >> index 37e06b76dc..c40776a40c 100644
> >> --- a/migration/migration.c
> >> +++ b/migration/migration.c
> >> @@ -1983,6 +1983,15 @@ bool migrate_dirty_bitmaps(void)
> >> return s->enabled_capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
> >> }
> >>
> >> +bool migrate_ignore_shared(void)
> >> +{
> >> + MigrationState *s;
> >> +
> >> + s = migrate_get_current();
> >> +
> >> + return s->enabled_capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED];
> >> +}
> >> +
> >> bool migrate_use_events(void)
> >> {
> >> MigrationState *s;
> >> diff --git a/migration/migration.h b/migration/migration.h
> >> index dcd05d9f87..2c88f8a555 100644
> >> --- a/migration/migration.h
> >> +++ b/migration/migration.h
> >> @@ -261,6 +261,7 @@ bool migrate_release_ram(void);
> >> bool migrate_postcopy_ram(void);
> >> bool migrate_zero_blocks(void);
> >> bool migrate_dirty_bitmaps(void);
> >> +bool migrate_ignore_shared(void);
> >>
> >> bool migrate_auto_converge(void);
> >> bool migrate_use_multifd(void);
> >> @@ -301,8 +302,10 @@ void
> >> migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value);
> >> void dirty_bitmap_mig_before_vm_start(void);
> >> void init_dirty_bitmap_incoming_migration(void);
> >>
> >> +int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque);
> >> +
> >> #define qemu_ram_foreach_block \
> >> - #warning "Use qemu_ram_foreach_block_migratable in migration code"
> >> + #warning "Use foreach_not_ignored_block in migration code"
> >>
> >> void migration_make_urgent_request(void);
> >> void migration_consume_urgent_request(void);
> >> diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
> >> index b098816221..e2aa57a701 100644
> >> --- a/migration/postcopy-ram.c
> >> +++ b/migration/postcopy-ram.c
> >> @@ -374,7 +374,7 @@ bool
> >> postcopy_ram_supported_by_host(MigrationIncomingState *mis)
> >> }
> >>
> >> /* We don't support postcopy with shared RAM yet */
> >> - if (qemu_ram_foreach_migratable_block(test_ramblock_postcopiable,
> >> NULL)) {
> >> + if (foreach_not_ignored_block(test_ramblock_postcopiable, NULL)) {
> >> goto out;
> >> }
> >>
> >> @@ -508,7 +508,7 @@ static int cleanup_range(RAMBlock *rb, void *opaque)
> >> */
> >> int postcopy_ram_incoming_init(MigrationIncomingState *mis)
> >> {
> >> - if (qemu_ram_foreach_migratable_block(init_range, NULL)) {
> >> + if (foreach_not_ignored_block(init_range, NULL)) {
> >> return -1;
> >> }
> >>
> >> @@ -550,7 +550,7 @@ int
> >> postcopy_ram_incoming_cleanup(MigrationIncomingState *mis)
> >> return -1;
> >> }
> >>
> >> - if (qemu_ram_foreach_migratable_block(cleanup_range, mis)) {
> >> + if (foreach_not_ignored_block(cleanup_range, mis)) {
> >> return -1;
> >> }
> >>
> >> @@ -617,7 +617,7 @@ static int nhp_range(RAMBlock *rb, void *opaque)
> >> */
> >> int postcopy_ram_prepare_discard(MigrationIncomingState *mis)
> >> {
> >> - if (qemu_ram_foreach_migratable_block(nhp_range, mis)) {
> >> + if (foreach_not_ignored_block(nhp_range, mis)) {
> >> return -1;
> >> }
> >>
> >> @@ -628,7 +628,7 @@ int
> >> postcopy_ram_prepare_discard(MigrationIncomingState *mis)
> >>
> >> /*
> >> * Mark the given area of RAM as requiring notification to unwritten
> >> areas
> >> - * Used as a callback on qemu_ram_foreach_migratable_block.
> >> + * Used as a callback on foreach_not_ignored_block.
> >> * host_addr: Base of area to mark
> >> * offset: Offset in the whole ram arena
> >> * length: Length of the section
> >> @@ -1122,7 +1122,7 @@ int
> >> postcopy_ram_enable_notify(MigrationIncomingState *mis)
> >> mis->have_fault_thread = true;
> >>
> >> /* Mark so that we get notified of accesses to unwritten areas */
> >> - if (qemu_ram_foreach_migratable_block(ram_block_enable_notify, mis)) {
> >> + if (foreach_not_ignored_block(ram_block_enable_notify, mis)) {
> >> error_report("ram_block_enable_notify failed");
> >> return -1;
> >> }
> >> diff --git a/migration/ram.c b/migration/ram.c
> >> index 59191c1ed2..01315edd66 100644
> >> --- a/migration/ram.c
> >> +++ b/migration/ram.c
> >> @@ -159,18 +159,44 @@ out:
> >> return ret;
> >> }
> >>
> >> +static bool ramblock_is_ignored(RAMBlock *block)
> >> +{
> >> + return !qemu_ram_is_migratable(block) ||
> >> + (migrate_ignore_shared() && qemu_ram_is_shared(block));
> >> +}
> >> +
> >> /* Should be holding either ram_list.mutex, or the RCU lock. */
> >> +#define RAMBLOCK_FOREACH_NOT_IGNORED(block) \
> >> + INTERNAL_RAMBLOCK_FOREACH(block) \
> >> + if (ramblock_is_ignored(block)) {} else
> >> +
> >> #define RAMBLOCK_FOREACH_MIGRATABLE(block) \
> >> INTERNAL_RAMBLOCK_FOREACH(block) \
> >> if (!qemu_ram_is_migratable(block)) {} else
> >>
> >> #undef RAMBLOCK_FOREACH
> >>
> >> +int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque)
> >> +{
> >> + RAMBlock *block;
> >> + int ret = 0;
> >> +
> >> + rcu_read_lock();
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> + ret = func(block, opaque);
> >> + if (ret) {
> >> + break;
> >> + }
> >> + }
> >> + rcu_read_unlock();
> >> + return ret;
> >> +}
> >> +
> >> static void ramblock_recv_map_init(void)
> >> {
> >> RAMBlock *rb;
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(rb) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(rb) {
> >> assert(!rb->receivedmap);
> >> rb->receivedmap = bitmap_new(rb->max_length >>
> >> qemu_target_page_bits());
> >> }
> >> @@ -1545,7 +1571,7 @@ unsigned long migration_bitmap_find_dirty(RAMState
> >> *rs, RAMBlock *rb,
> >> unsigned long *bitmap = rb->bmap;
> >> unsigned long next;
> >>
> >> - if (!qemu_ram_is_migratable(rb)) {
> >> + if (ramblock_is_ignored(rb)) {
> >> return size;
> >> }
> >>
> >> @@ -1594,7 +1620,7 @@ uint64_t ram_pagesize_summary(void)
> >> RAMBlock *block;
> >> uint64_t summary = 0;
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> summary |= block->page_size;
> >> }
> >>
> >> @@ -1664,7 +1690,7 @@ static void migration_bitmap_sync(RAMState *rs)
> >>
> >> qemu_mutex_lock(&rs->bitmap_mutex);
> >> rcu_read_lock();
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> migration_bitmap_sync_range(rs, block, 0, block->used_length);
> >> }
> >> ram_counters.remaining = ram_bytes_remaining();
> >> @@ -2388,7 +2414,7 @@ static int ram_save_host_page(RAMState *rs,
> >> PageSearchStatus *pss,
> >> size_t pagesize_bits =
> >> qemu_ram_pagesize(pss->block) >> TARGET_PAGE_BITS;
> >>
> >> - if (!qemu_ram_is_migratable(pss->block)) {
> >> + if (ramblock_is_ignored(pss->block)) {
> >> error_report("block %s should not be migrated !",
> >> pss->block->idstr);
> >> return 0;
> >> }
> >> @@ -2486,19 +2512,30 @@ void acct_update_position(QEMUFile *f, size_t
> >> size, bool zero)
> >> }
> >> }
> >>
> >> -uint64_t ram_bytes_total(void)
> >> +static uint64_t ram_bytes_total_common(bool count_ignored)
> >> {
> >> RAMBlock *block;
> >> uint64_t total = 0;
> >>
> >> rcu_read_lock();
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> - total += block->used_length;
> >> + if (count_ignored) {
> >> + RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + total += block->used_length;
> >> + }
> >> + } else {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> + total += block->used_length;
> >> + }
> >> }
> >> rcu_read_unlock();
> >> return total;
> >> }
> >>
> >> +uint64_t ram_bytes_total(void)
> >> +{
> >> + return ram_bytes_total_common(false);
> >> +}
> >> +
> >> static void xbzrle_load_setup(void)
> >> {
> >> XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE);
> >> @@ -2547,7 +2584,7 @@ static void ram_save_cleanup(void *opaque)
> >> */
> >> memory_global_dirty_log_stop();
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> g_free(block->bmap);
> >> block->bmap = NULL;
> >> g_free(block->unsentmap);
> >> @@ -2610,7 +2647,7 @@ void
> >> ram_postcopy_migrated_memory_release(MigrationState *ms)
> >> {
> >> struct RAMBlock *block;
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> unsigned long *bitmap = block->bmap;
> >> unsigned long range = block->used_length >> TARGET_PAGE_BITS;
> >> unsigned long run_start = find_next_zero_bit(bitmap, range, 0);
> >> @@ -2688,7 +2725,7 @@ static int
> >> postcopy_each_ram_send_discard(MigrationState *ms)
> >> struct RAMBlock *block;
> >> int ret;
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> PostcopyDiscardState *pds =
> >> postcopy_discard_send_init(ms, block->idstr);
> >>
> >> @@ -2896,7 +2933,7 @@ int ram_postcopy_send_discard_bitmap(MigrationState
> >> *ms)
> >> rs->last_sent_block = NULL;
> >> rs->last_page = 0;
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> unsigned long pages = block->used_length >> TARGET_PAGE_BITS;
> >> unsigned long *bitmap = block->bmap;
> >> unsigned long *unsentmap = block->unsentmap;
> >> @@ -3062,7 +3099,7 @@ static void ram_list_init_bitmaps(void)
> >>
> >> /* Skip setting bitmap if there is no RAM */
> >> if (ram_bytes_total()) {
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> pages = block->max_length >> TARGET_PAGE_BITS;
> >> block->bmap = bitmap_new(pages);
> >> bitmap_set(block->bmap, 0, pages);
> >> @@ -3117,7 +3154,7 @@ static void ram_state_resume_prepare(RAMState *rs,
> >> QEMUFile *out)
> >> * about dirty page logging as well.
> >> */
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> pages += bitmap_count_one(block->bmap,
> >> block->used_length >>
> >> TARGET_PAGE_BITS);
> >> }
> >> @@ -3176,7 +3213,7 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
> >>
> >> rcu_read_lock();
> >>
> >> - qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
> >> + qemu_put_be64(f, ram_bytes_total_common(true) | RAM_SAVE_FLAG_MEM_SIZE);
> >>
> >> RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> qemu_put_byte(f, strlen(block->idstr));
> >> @@ -3185,6 +3222,10 @@ static int ram_save_setup(QEMUFile *f, void
> >> *opaque)
> >> if (migrate_postcopy_ram() && block->page_size !=
> >> qemu_host_page_size) {
> >> qemu_put_be64(f, block->page_size);
> >> }
> >> + if (migrate_ignore_shared()) {
> >> + qemu_put_be64(f, block->mr->addr);
> >> + qemu_put_byte(f, ramblock_is_ignored(block) ? 1 : 0);
> >> + }
> >> }
> >>
> >> rcu_read_unlock();
> >> @@ -3443,7 +3484,7 @@ static inline RAMBlock
> >> *ram_block_from_stream(QEMUFile *f, int flags)
> >> return NULL;
> >> }
> >>
> >> - if (!qemu_ram_is_migratable(block)) {
> >> + if (ramblock_is_ignored(block)) {
> >> error_report("block %s should not be migrated !", id);
> >> return NULL;
> >> }
> >> @@ -3698,7 +3739,7 @@ int colo_init_ram_cache(void)
> >> RAMBlock *block;
> >>
> >> rcu_read_lock();
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> block->colo_cache = qemu_anon_ram_alloc(block->used_length,
> >> NULL,
> >> false);
> >> @@ -3719,7 +3760,7 @@ int colo_init_ram_cache(void)
> >> if (ram_bytes_total()) {
> >> RAMBlock *block;
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> unsigned long pages = block->max_length >> TARGET_PAGE_BITS;
> >>
> >> block->bmap = bitmap_new(pages);
> >> @@ -3734,7 +3775,7 @@ int colo_init_ram_cache(void)
> >>
> >> out_locked:
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> if (block->colo_cache) {
> >> qemu_anon_ram_free(block->colo_cache, block->used_length);
> >> block->colo_cache = NULL;
> >> @@ -3751,14 +3792,14 @@ void colo_release_ram_cache(void)
> >> RAMBlock *block;
> >>
> >> memory_global_dirty_log_stop();
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> g_free(block->bmap);
> >> block->bmap = NULL;
> >> }
> >>
> >> rcu_read_lock();
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> if (block->colo_cache) {
> >> qemu_anon_ram_free(block->colo_cache, block->used_length);
> >> block->colo_cache = NULL;
> >> @@ -3794,7 +3835,7 @@ static int ram_load_cleanup(void *opaque)
> >> {
> >> RAMBlock *rb;
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(rb) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(rb) {
> >> if (ramblock_is_pmem(rb)) {
> >> pmem_persist(rb->host, rb->used_length);
> >> }
> >> @@ -3803,7 +3844,7 @@ static int ram_load_cleanup(void *opaque)
> >> xbzrle_load_cleanup();
> >> compress_threads_load_cleanup();
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(rb) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(rb) {
> >> g_free(rb->receivedmap);
> >> rb->receivedmap = NULL;
> >> }
> >> @@ -4003,7 +4044,7 @@ static void colo_flush_ram_cache(void)
> >>
> >> memory_global_dirty_log_sync();
> >> rcu_read_lock();
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> migration_bitmap_sync_range(ram_state, block, 0,
> >> block->used_length);
> >> }
> >> rcu_read_unlock();
> >> @@ -4146,6 +4187,23 @@ static int ram_load(QEMUFile *f, void *opaque, int
> >> version_id)
> >> ret = -EINVAL;
> >> }
> >> }
> >> + if (migrate_ignore_shared()) {
> >> + hwaddr addr = qemu_get_be64(f);
> >> + bool ignored = qemu_get_byte(f);
> >> + if (ignored != ramblock_is_ignored(block)) {
> >> + error_report("RAM block %s should %s be migrated",
> >> + id, ignored ? "" : "not");
> >> + ret = -EINVAL;
> >> + }
> >> + if (ramblock_is_ignored(block) &&
> >> + block->mr->addr != addr) {
> >> + error_report("Mismatched GPAs for block %s "
> >> + "%" PRId64 "!= %" PRId64,
> >> + id, (uint64_t)addr,
> >> + (uint64_t)block->mr->addr);
> >> + ret = -EINVAL;
> >> + }
> >> + }
> >> ram_control_load_hook(f, RAM_CONTROL_BLOCK_REG,
> >> block->idstr);
> >> } else {
> >> @@ -4216,7 +4274,7 @@ static int ram_load(QEMUFile *f, void *opaque, int
> >> version_id)
> >> static bool ram_has_postcopy(void *opaque)
> >> {
> >> RAMBlock *rb;
> >> - RAMBLOCK_FOREACH_MIGRATABLE(rb) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(rb) {
> >> if (ramblock_is_pmem(rb)) {
> >> info_report("Block: %s, host: %p is a nvdimm memory,
> >> postcopy"
> >> "is not supported now!", rb->idstr, rb->host);
> >> @@ -4236,7 +4294,7 @@ static int ram_dirty_bitmap_sync_all(MigrationState
> >> *s, RAMState *rs)
> >>
> >> trace_ram_dirty_bitmap_sync_start();
> >>
> >> - RAMBLOCK_FOREACH_MIGRATABLE(block) {
> >> + RAMBLOCK_FOREACH_NOT_IGNORED(block) {
> >> qemu_savevm_send_recv_bitmap(file, block->idstr);
> >> trace_ram_dirty_bitmap_request(block->idstr);
> >> ramblock_count++;
> >> diff --git a/migration/rdma.c b/migration/rdma.c
> >> index 7eb38ee764..3cb579cc99 100644
> >> --- a/migration/rdma.c
> >> +++ b/migration/rdma.c
> >> @@ -644,7 +644,7 @@ static int qemu_rdma_init_ram_blocks(RDMAContext
> >> *rdma)
> >>
> >> assert(rdma->blockmap == NULL);
> >> memset(local, 0, sizeof *local);
> >> - qemu_ram_foreach_migratable_block(qemu_rdma_init_one_block, rdma);
> >> + foreach_not_ignored_block(qemu_rdma_init_one_block, rdma);
> >> trace_qemu_rdma_init_ram_blocks(local->nb_blocks);
> >> rdma->dest_blocks = g_new0(RDMADestBlock,
> >> rdma->local_ram_blocks.nb_blocks);
> >> diff --git a/qapi/migration.json b/qapi/migration.json
> >> index 7a795ecc16..7105570cd3 100644
> >> --- a/qapi/migration.json
> >> +++ b/qapi/migration.json
> >> @@ -409,13 +409,16 @@
> >> # devices (and thus take locks) immediately at the end of migration.
> >> # (since 3.0)
> >> #
> >> +# @x-ignore-shared: If enabled, QEMU will not migrate shared memory
> >> (since 4.0)
> >> +#
> >> # Since: 1.2
> >> ##
> >> { 'enum': 'MigrationCapability',
> >> 'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
> >> 'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
> >> 'block', 'return-path', 'pause-before-switchover',
> >> 'x-multifd',
> >> - 'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate' ] }
> >> + 'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate',
> >> + 'x-ignore-shared' ] }
> >>
> >> ##
> >> # @MigrationCapabilityStatus:
> >> diff --git a/stubs/ram-block.c b/stubs/ram-block.c
> >> index cfa5d8678f..73c0a3ee08 100644
> >> --- a/stubs/ram-block.c
> >> +++ b/stubs/ram-block.c
> >> @@ -2,6 +2,21 @@
> >> #include "exec/ramlist.h"
> >> #include "exec/cpu-common.h"
> >>
> >> +void *qemu_ram_get_host_addr(RAMBlock *rb)
> >> +{
> >> + return 0;
> >> +}
> >> +
> >> +ram_addr_t qemu_ram_get_offset(RAMBlock *rb)
> >> +{
> >> + return 0;
> >> +}
> >> +
> >> +ram_addr_t qemu_ram_get_used_length(RAMBlock *rb)
> >> +{
> >> + return 0;
> >> +}
> >> +
> >> void ram_block_notifier_add(RAMBlockNotifier *n)
> >> {
> >> }
> >> --
> >> 2.20.1
> > --
> > Dr. David Alan Gilbert / address@hidden / Manchester, UK
>
> Regards,
> Yury
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK