memory: Add Error** argument to the global_dirty_log routines
Now that the log_global*() handlers take an Error** parameter and
return a bool, do the same for memory_global_dirty_log_start() and
memory_global_dirty_log_stop(). The error is reported in the callers
for now and it will be propagated in the call stack in the next
changes.
To be noted a functional change in ram_init_bitmaps(), if the dirty
pages logger fails to start, there is no need to synchronize the dirty
pages bitmaps. colo_incoming_start_dirty_log() could be modified in a
similar way.
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Paul Durrant <paul@xen.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hyman Huang <yong.huang@smartx.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Acked-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240320064911.545001-12-clg@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index f6e9a1b..006d219 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -669,7 +669,7 @@
void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
{
if (enable) {
- memory_global_dirty_log_start(GLOBAL_DIRTY_MIGRATION);
+ memory_global_dirty_log_start(GLOBAL_DIRTY_MIGRATION, errp);
} else {
memory_global_dirty_log_stop(GLOBAL_DIRTY_MIGRATION);
}
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 5555567..c129ee6 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -2570,8 +2570,11 @@
* memory_global_dirty_log_start: begin dirty logging for all regions
*
* @flags: purpose of starting dirty log, migration or dirty rate
+ * @errp: pointer to Error*, to store an error if it happens.
+ *
+ * Return: true on success, else false setting @errp with error.
*/
-void memory_global_dirty_log_start(unsigned int flags);
+bool memory_global_dirty_log_start(unsigned int flags, Error **errp);
/**
* memory_global_dirty_log_stop: end dirty logging for all regions
diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index 1d2e857..d02d70b 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -90,9 +90,15 @@
void global_dirty_log_change(unsigned int flag, bool start)
{
+ Error *local_err = NULL;
+ bool ret;
+
bql_lock();
if (start) {
- memory_global_dirty_log_start(flag);
+ ret = memory_global_dirty_log_start(flag, &local_err);
+ if (!ret) {
+ error_report_err(local_err);
+ }
} else {
memory_global_dirty_log_stop(flag);
}
@@ -608,9 +614,12 @@
{
int64_t start_time;
DirtyPageRecord dirty_pages;
+ Error *local_err = NULL;
bql_lock();
- memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE);
+ if (!memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE, &local_err)) {
+ error_report_err(local_err);
+ }
/*
* 1'round of log sync may return all 1 bits with
diff --git a/migration/ram.c b/migration/ram.c
index f0bd714..bade3e9 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2862,18 +2862,32 @@
static void ram_init_bitmaps(RAMState *rs)
{
+ Error *local_err = NULL;
+ bool ret = true;
+
qemu_mutex_lock_ramlist();
WITH_RCU_READ_LOCK_GUARD() {
ram_list_init_bitmaps();
/* We don't use dirty log with background snapshots */
if (!migrate_background_snapshot()) {
- memory_global_dirty_log_start(GLOBAL_DIRTY_MIGRATION);
+ ret = memory_global_dirty_log_start(GLOBAL_DIRTY_MIGRATION,
+ &local_err);
+ if (!ret) {
+ error_report_err(local_err);
+ goto out_unlock;
+ }
migration_bitmap_sync_precopy(rs, false);
}
}
+out_unlock:
qemu_mutex_unlock_ramlist();
+ if (!ret) {
+ ram_bitmaps_destroy();
+ return;
+ }
+
/*
* After an eventual first bitmap sync, fixup the initial bitmap
* containing all 1s to exclude any discarded pages from migration.
@@ -3665,6 +3679,8 @@
void colo_incoming_start_dirty_log(void)
{
RAMBlock *block = NULL;
+ Error *local_err = NULL;
+
/* For memory_global_dirty_log_start below. */
bql_lock();
qemu_mutex_lock_ramlist();
@@ -3676,7 +3692,10 @@
/* Discard this dirty bitmap record */
bitmap_zero(block->bmap, block->max_length >> TARGET_PAGE_BITS);
}
- memory_global_dirty_log_start(GLOBAL_DIRTY_MIGRATION);
+ if (!memory_global_dirty_log_start(GLOBAL_DIRTY_MIGRATION,
+ &local_err)) {
+ error_report_err(local_err);
+ }
}
ram_state->migration_dirty_pages = 0;
qemu_mutex_unlock_ramlist();
diff --git a/system/memory.c b/system/memory.c
index 86d6c33..c02c1d4 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -2937,10 +2937,9 @@
return false;
}
-void memory_global_dirty_log_start(unsigned int flags)
+bool memory_global_dirty_log_start(unsigned int flags, Error **errp)
{
unsigned int old_flags;
- Error *local_err = NULL;
assert(flags && !(flags & (~GLOBAL_DIRTY_MASK)));
@@ -2952,7 +2951,7 @@
flags &= ~global_dirty_tracking;
if (!flags) {
- return;
+ return true;
}
old_flags = global_dirty_tracking;
@@ -2960,17 +2959,17 @@
trace_global_dirty_changed(global_dirty_tracking);
if (!old_flags) {
- if (!memory_global_dirty_log_do_start(&local_err)) {
+ if (!memory_global_dirty_log_do_start(errp)) {
global_dirty_tracking &= ~flags;
trace_global_dirty_changed(global_dirty_tracking);
- error_report_err(local_err);
- return;
+ return false;
}
memory_region_transaction_begin();
memory_region_update_pending = true;
memory_region_transaction_commit();
}
+ return true;
}
static void memory_global_dirty_log_do_stop(unsigned int flags)
