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Re: [Qemu-devel] [PATCH v2 2/4] migration: Introduce ignore-shared capab
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From: |
Yury Kotov |
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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 16:36:27 +0300 |
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?
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