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[Qemu-devel] [PATCH v2 2/4] migration: Introduce ignore-shared capabilit
|
From: |
Yury Kotov |
|
Subject: |
[Qemu-devel] [PATCH v2 2/4] migration: Introduce ignore-shared capability |
|
Date: |
Mon, 4 Feb 2019 16:09:56 +0300 |
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>
---
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