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[Qemu-devel] [PATCH COLO-Frame v10 13/38] COLO: Load PVM's dirty pages i
From: |
zhanghailiang |
Subject: |
[Qemu-devel] [PATCH COLO-Frame v10 13/38] COLO: Load PVM's dirty pages into SVM's RAM cache temporarily |
Date: |
Tue, 3 Nov 2015 19:56:31 +0800 |
We should not load PVM's state directly into SVM, because there maybe some
errors happen when SVM is receving data, which will break SVM.
We need to ensure receving all data before load the state into SVM. We use
an extra memory to cache these data (PVM's ram). The ram cache in secondary side
is initially the same as SVM/PVM's memory. And in the process of checkpoint,
we cache the dirty pages of PVM into this ram cache firstly, so this ram cache
always the same as PVM's memory at every checkpoint, then we flush this cached
ram
to SVM after we receive all PVM's state.
Signed-off-by: zhanghailiang <address@hidden>
Signed-off-by: Li Zhijian <address@hidden>
Signed-off-by: Gonglei <address@hidden>
---
v10: Split the process of dirty pages recording into a new patch
---
include/exec/ram_addr.h | 1 +
include/migration/colo.h | 3 +++
migration/colo.c | 14 +++++++++--
migration/ram.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++--
4 files changed, 75 insertions(+), 4 deletions(-)
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index 3360ac5..e7c4310 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -28,6 +28,7 @@ struct RAMBlock {
struct rcu_head rcu;
struct MemoryRegion *mr;
uint8_t *host;
+ uint8_t *host_cache; /* For colo, VM's ram cache */
ram_addr_t offset;
ram_addr_t used_length;
ram_addr_t max_length;
diff --git a/include/migration/colo.h b/include/migration/colo.h
index 2676c4a..8edd5f1 100644
--- a/include/migration/colo.h
+++ b/include/migration/colo.h
@@ -29,4 +29,7 @@ bool migration_incoming_enable_colo(void);
void migration_incoming_exit_colo(void);
void *colo_process_incoming_thread(void *opaque);
bool migration_incoming_in_colo_state(void);
+/* ram cache */
+int colo_init_ram_cache(void);
+void colo_release_ram_cache(void);
#endif
diff --git a/migration/colo.c b/migration/colo.c
index b865513..25f85b2 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -304,6 +304,12 @@ void *colo_process_incoming_thread(void *opaque)
goto out;
}
+ ret = colo_init_ram_cache();
+ if (ret < 0) {
+ error_report("Failed to initialize ram cache");
+ goto out;
+ }
+
ret = colo_ctl_put(mis->to_src_file, COLO_COMMAND_CHECKPOINT_READY, 0);
if (ret < 0) {
goto out;
@@ -331,14 +337,14 @@ void *colo_process_incoming_thread(void *opaque)
goto out;
}
- /* TODO: read migration data into colo buffer */
+ /* TODO Load VM state */
ret = colo_ctl_put(mis->to_src_file, COLO_COMMAND_VMSTATE_RECEIVED, 0);
if (ret < 0) {
goto out;
}
- /* TODO: load vm state */
+ /* TODO: flush vm state */
ret = colo_ctl_put(mis->to_src_file, COLO_COMMAND_VMSTATE_LOADED, 0);
if (ret < 0) {
@@ -352,6 +358,10 @@ out:
strerror(-ret));
}
+ qemu_mutex_lock_iothread();
+ colo_release_ram_cache();
+ qemu_mutex_unlock_iothread();
+
if (mis->to_src_file) {
qemu_fclose(mis->to_src_file);
}
diff --git a/migration/ram.c b/migration/ram.c
index 5784c15..b094dc3 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -222,6 +222,7 @@ static RAMBlock *last_sent_block;
static ram_addr_t last_offset;
static QemuMutex migration_bitmap_mutex;
static uint64_t migration_dirty_pages;
+static bool ram_cache_enable;
static uint32_t last_version;
static bool ram_bulk_stage;
@@ -1446,7 +1447,11 @@ static inline void *host_from_stream_offset(QEMUFile *f,
return NULL;
}
- return block->host + offset;
+ if (ram_cache_enable) {
+ return block->host_cache + offset;
+ } else {
+ return block->host + offset;
+ }
}
len = qemu_get_byte(f);
@@ -1456,7 +1461,11 @@ static inline void *host_from_stream_offset(QEMUFile *f,
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
if (!strncmp(id, block->idstr, sizeof(id)) &&
block->max_length > offset) {
- return block->host + offset;
+ if (ram_cache_enable) {
+ return block->host_cache + offset;
+ } else {
+ return block->host + offset;
+ }
}
}
@@ -1707,6 +1716,54 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
return ret;
}
+/*
+ * colo cache: this is for secondary VM, we cache the whole
+ * memory of the secondary VM, it will be called after first migration.
+ */
+int colo_init_ram_cache(void)
+{
+ RAMBlock *block;
+
+ rcu_read_lock();
+ QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ block->host_cache = qemu_anon_ram_alloc(block->used_length, NULL);
+ if (!block->host_cache) {
+ goto out_locked;
+ }
+ memcpy(block->host_cache, block->host, block->used_length);
+ }
+ rcu_read_unlock();
+ ram_cache_enable = true;
+ return 0;
+
+out_locked:
+ QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ if (block->host_cache) {
+ qemu_anon_ram_free(block->host_cache, block->used_length);
+ block->host_cache = NULL;
+ }
+ }
+
+ rcu_read_unlock();
+ return -errno;
+}
+
+void colo_release_ram_cache(void)
+{
+ RAMBlock *block;
+
+ ram_cache_enable = false;
+
+ rcu_read_lock();
+ QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ if (block->host_cache) {
+ qemu_anon_ram_free(block->host_cache, block->used_length);
+ block->host_cache = NULL;
+ }
+ }
+ rcu_read_unlock();
+}
+
static SaveVMHandlers savevm_ram_handlers = {
.save_live_setup = ram_save_setup,
.save_live_iterate = ram_save_iterate,
--
1.8.3.1
- [Qemu-devel] [PATCH COLO-Frame v10 36/38] netfilter: Introduce an API to delete all the automatically added netfilters, (continued)
- [Qemu-devel] [PATCH COLO-Frame v10 36/38] netfilter: Introduce an API to delete all the automatically added netfilters, zhanghailiang, 2015/11/03
- [Qemu-devel] [PATCH COLO-Frame v10 06/38] migration: Integrate COLO checkpoint process into loadvm, zhanghailiang, 2015/11/03
- [Qemu-devel] [PATCH COLO-Frame v10 31/38] COLO: Split qemu_savevm_state_begin out of checkpoint process, zhanghailiang, 2015/11/03
- [Qemu-devel] [PATCH COLO-Frame v10 08/38] COLO/migration: establish a new communication path from destination to source, zhanghailiang, 2015/11/03
- [Qemu-devel] [PATCH COLO-Frame v10 16/38] COLO: Flush PVM's cached RAM into SVM's memory, zhanghailiang, 2015/11/03
- [Qemu-devel] [PATCH COLO-Frame v10 13/38] COLO: Load PVM's dirty pages into SVM's RAM cache temporarily,
zhanghailiang <=
- [Qemu-devel] [PATCH COLO-Frame v10 14/38] COLO: Load VMState into qsb before restore it, zhanghailiang, 2015/11/03
- [Qemu-devel] [PATCH COLO-Frame v10 18/38] COLO failover: Introduce a new command to trigger a failover, zhanghailiang, 2015/11/03
- [Qemu-devel] [PATCH COLO-Frame v10 20/38] COLO: Implement failover work for Primary VM, zhanghailiang, 2015/11/03
- [Qemu-devel] [PATCH COLO-Frame v10 21/38] COLO: Implement failover work for Secondary VM, zhanghailiang, 2015/11/03