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async snapshot: improve error handling for 'savevm-start' QMP command

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Return values for qemu_savevm_state_setup() and blk_set_aio_context()
now get checked.

Move the qemu_coroutine_create() call to after the new early return
to avoid a potential memory leak.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fiona Ebner 2024-11-25 12:00:43 +01:00 committed by Thomas Lamprecht
parent 5fff8d91c7
commit 28ad83b492
2 changed files with 22 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
debian/patches/pve/0017-PVE-add-savevm-async-for-background-state-snapshots.patch vendored
View File

@ -37,13 +37,13 @@ Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
include/migration/snapshot.h | 2 +
include/monitor/hmp.h | 3 +
migration/meson.build | 1 +
migration/savevm-async.c | 537 +++++++++++++++++++++++++++++++++++
migration/savevm-async.c | 549 +++++++++++++++++++++++++++++++++++
monitor/hmp-cmds.c | 38 +++
qapi/migration.json | 34 +++
qapi/misc.json | 18 ++
qemu-options.hx | 12 +
system/vl.c | 10 +
11 files changed, 685 insertions(+)
11 files changed, 697 insertions(+)
create mode 100644 migration/savevm-async.c
diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
@ -141,10 +141,10 @@ index 020127d901..4b0c4f0f51 100644
'threadinfo.c',
diff --git a/migration/savevm-async.c b/migration/savevm-async.c
new file mode 100644
index 0000000000..59bb0b57d9
index 0000000000..4c90209188
--- /dev/null
+++ b/migration/savevm-async.c
@@ -0,0 +1,537 @@
@@ -0,0 +1,549 @@
+#include "qemu/osdep.h"
+#include "migration/channel-savevm-async.h"
+#include "migration/migration.h"
@ -167,6 +167,7 @@ index 0000000000..59bb0b57d9
+#include "qapi/qapi-commands-misc.h"
+#include "qapi/qapi-commands-block.h"
+#include "qemu/cutils.h"
+#include "qemu/error-report.h"
+#include "qemu/timer.h"
+#include "qemu/main-loop.h"
+#include "qemu/rcu.h"
@ -479,6 +480,7 @@ index 0000000000..59bb0b57d9
+ Error *local_err = NULL;
+ MigrationState *ms = migrate_get_current();
+ AioContext *iohandler_ctx = iohandler_get_aio_context();
+ int ret = 0;
+
+ int bdrv_oflags = BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_NO_FLUSH;
+
@ -549,15 +551,25 @@ index 0000000000..59bb0b57d9
+
+ snap_state.state = SAVE_STATE_ACTIVE;
+ snap_state.finalize_bh = qemu_bh_new(process_savevm_finalize, &snap_state);
+ snap_state.co = qemu_coroutine_create(&process_savevm_co, NULL);
+ qemu_savevm_state_header(snap_state.file);
+ qemu_savevm_state_setup(snap_state.file, &local_err);
+ ret = qemu_savevm_state_setup(snap_state.file, &local_err);
+ if (ret != 0) {
+ error_setg_errno(errp, -ret, "savevm state setup failed: %s",
+ local_err ? error_get_pretty(local_err) : "unknown error");
+ return;
+ }
+
+ /* Async processing from here on out happens in iohandler context, so let
+ * the target bdrv have its home there.
+ */
+ blk_set_aio_context(snap_state.target, iohandler_ctx, &local_err);
+ ret = blk_set_aio_context(snap_state.target, iohandler_ctx, &local_err);
+ if (ret != 0) {
+ warn_report("failed to set iohandler context for VM state target: %s %s",
+ local_err ? error_get_pretty(local_err) : "unknown error",
+ strerror(-ret));
+ }
+
+ snap_state.co = qemu_coroutine_create(&process_savevm_co, NULL);
+ aio_co_schedule(iohandler_ctx, snap_state.co);
+
+ return;

6
debian/patches/pve/0018-PVE-add-optional-buffer-size-to-QEMUFile.patch vendored
View File

@ -184,10 +184,10 @@ index 11c2120edd..edf3c5d147 100644
/*
diff --git a/migration/savevm-async.c b/migration/savevm-async.c
index 59bb0b57d9..9a4dd1e4f5 100644
index 4c90209188..eb562d3dcf 100644
--- a/migration/savevm-async.c
+++ b/migration/savevm-async.c
@@ -379,7 +379,7 @@ void qmp_savevm_start(const char *statefile, Error **errp)
@@ -381,7 +381,7 @@ void qmp_savevm_start(const char *statefile, Error **errp)
QIOChannel *ioc = QIO_CHANNEL(qio_channel_savevm_async_new(snap_state.target,
&snap_state.bs_pos));
@ -196,7 +196,7 @@ index 59bb0b57d9..9a4dd1e4f5 100644
if (!snap_state.file) {
error_setg(errp, "failed to open '%s'", statefile);
@@ -502,7 +502,8 @@ int load_snapshot_from_blockdev(const char *filename, Error **errp)
@@ -514,7 +514,8 @@ int load_snapshot_from_blockdev(const char *filename, Error **errp)
blk_op_block_all(be, blocker);
/* restore the VM state */