qemu/0127-migration-run-setup-callbacks-out-of-big-lock.patch
Cole Robinson a7b9285033 Update to qemu stable 1.4.2
Alias qemu-system-* man page to qemu.1 (bz #907746)
Drop execute bit on service files (bz #963917)
Conditionalize KSM service on host virt support (bz #963681)
Split out KSM package, make it not pulled in by default
2013-05-25 15:13:26 -04:00

118 lines
3.9 KiB
Diff

From ffe95e1c4daef0e563b8d70a8f456f9e7037818d Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 22 Feb 2013 17:36:28 +0100
Subject: [PATCH] migration: run setup callbacks out of big lock
Only the migration_bitmap_sync() call needs the iothread lock.
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
(cherry picked from commit 9b0950375277467fd74a9075624477ae43b9bb22)
---
arch_init.c | 10 ++++++----
block-migration.c | 2 ++
include/migration/vmstate.h | 2 +-
migration.c | 2 --
savevm.c | 3 +++
5 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index 32b4378..6089c53 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -570,10 +570,6 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
bitmap_set(migration_bitmap, 0, ram_pages);
migration_dirty_pages = ram_pages;
- qemu_mutex_lock_ramlist();
- bytes_transferred = 0;
- reset_ram_globals();
-
if (migrate_use_xbzrle()) {
XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() /
TARGET_PAGE_SIZE,
@@ -587,8 +583,14 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
acct_clear();
}
+ qemu_mutex_lock_iothread();
+ qemu_mutex_lock_ramlist();
+ bytes_transferred = 0;
+ reset_ram_globals();
+
memory_global_dirty_log_start();
migration_bitmap_sync();
+ qemu_mutex_unlock_iothread();
qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
diff --git a/block-migration.c b/block-migration.c
index 8da5f86..2fd7699 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -583,10 +583,12 @@ static int block_save_setup(QEMUFile *f, void *opaque)
DPRINTF("Enter save live setup submitted %d transferred %d\n",
block_mig_state.submitted, block_mig_state.transferred);
+ qemu_mutex_lock_iothread();
init_blk_migration(f);
/* start track dirty blocks */
set_dirty_tracking(1);
+ qemu_mutex_unlock_iothread();
ret = flush_blks(f);
blk_mig_reset_dirty_cursor();
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 5f803f5..abc3b47 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -34,7 +34,6 @@ typedef struct SaveVMHandlers {
void (*set_params)(const MigrationParams *params, void * opaque);
SaveStateHandler *save_state;
- int (*save_live_setup)(QEMUFile *f, void *opaque);
void (*cancel)(void *opaque);
int (*save_live_complete)(QEMUFile *f, void *opaque);
@@ -49,6 +48,7 @@ typedef struct SaveVMHandlers {
int (*save_live_iterate)(QEMUFile *f, void *opaque);
/* 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);
LoadStateHandler *load_state;
diff --git a/migration.c b/migration.c
index 87b5009..7c1d4df 100644
--- a/migration.c
+++ b/migration.c
@@ -660,10 +660,8 @@ static void *buffered_file_thread(void *opaque)
bool old_vm_running = false;
bool last_round = false;
- qemu_mutex_lock_iothread();
DPRINTF("beginning savevm\n");
qemu_savevm_state_begin(s->file, &s->params);
- qemu_mutex_unlock_iothread();
while (s->state == MIG_STATE_ACTIVE) {
int64_t current_time;
diff --git a/savevm.c b/savevm.c
index e10a045..7c7774e 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1768,7 +1768,10 @@ static int qemu_savevm_state(QEMUFile *f)
return -EINVAL;
}
+ qemu_mutex_unlock_iothread();
qemu_savevm_state_begin(f, &params);
+ qemu_mutex_lock_iothread();
+
while (qemu_file_get_error(f) == 0) {
if (qemu_savevm_state_iterate(f) > 0) {
break;