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[PATCH v2 1/2] migration: allow multifd for socket protocol only
From: |
Li Zhijian |
Subject: |
[PATCH v2 1/2] migration: allow multifd for socket protocol only |
Date: |
Sat, 31 Jul 2021 22:05:51 +0800 |
multifd with unsupported protocol will cause a segment fault.
(gdb) bt
#0 0x0000563b4a93faf8 in socket_connect (addr=0x0, errp=0x7f7f02675410) at
../util/qemu-sockets.c:1190
#1 0x0000563b4a797a03 in qio_channel_socket_connect_sync (ioc=0x563b4d16e8c0,
addr=0x0, errp=0x7f7f02675410) at ../io/channel-socket.c:145
#2 0x0000563b4a797abf in qio_channel_socket_connect_worker
(task=0x563b4cd86c30, opaque=0x0) at ../io/channel-socket.c:168
#3 0x0000563b4a792631 in qio_task_thread_worker (opaque=0x563b4cd86c30) at
../io/task.c:124
#4 0x0000563b4a91da69 in qemu_thread_start (args=0x563b4c44bb80) at
../util/qemu-thread-posix.c:541
#5 0x00007f7fe9b5b3f9 in ?? ()
#6 0x0000000000000000 in ?? ()
It's enough to check migrate_multifd_is_allowed() in multifd cleanup() and
multifd setup() though there are so many other places using
migrate_use_multifd().
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
---
migration/migration.c | 4 ++++
migration/multifd.c | 24 ++++++++++++++++++++++--
migration/multifd.h | 2 ++
3 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index 2d306582ebf..212314541f1 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -456,10 +456,12 @@ static void qemu_start_incoming_migration(const char
*uri, Error **errp)
{
const char *p = NULL;
+ migrate_protocol_allow_multifd(false); /* reset it anyway */
qapi_event_send_migration(MIGRATION_STATUS_SETUP);
if (strstart(uri, "tcp:", &p) ||
strstart(uri, "unix:", NULL) ||
strstart(uri, "vsock:", NULL)) {
+ migrate_protocol_allow_multifd(true);
socket_start_incoming_migration(p ? p : uri, errp);
#ifdef CONFIG_RDMA
} else if (strstart(uri, "rdma:", &p)) {
@@ -2289,9 +2291,11 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
}
}
+ migrate_protocol_allow_multifd(false);
if (strstart(uri, "tcp:", &p) ||
strstart(uri, "unix:", NULL) ||
strstart(uri, "vsock:", NULL)) {
+ migrate_protocol_allow_multifd(true);
socket_start_outgoing_migration(s, p ? p : uri, &local_err);
#ifdef CONFIG_RDMA
} else if (strstart(uri, "rdma:", &p)) {
diff --git a/migration/multifd.c b/migration/multifd.c
index ab41590e714..4a4d16d3888 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -531,7 +531,7 @@ void multifd_save_cleanup(void)
{
int i;
- if (!migrate_use_multifd()) {
+ if (!migrate_use_multifd() || !migrate_multifd_is_allowed()) {
return;
}
multifd_send_terminate_threads(NULL);
@@ -864,6 +864,17 @@ cleanup:
multifd_new_send_channel_cleanup(p, sioc, local_err);
}
+static bool migrate_allow_multifd;
+void migrate_protocol_allow_multifd(bool allow)
+{
+ migrate_allow_multifd = allow;
+}
+
+bool migrate_multifd_is_allowed(void)
+{
+ return migrate_allow_multifd;
+}
+
int multifd_save_setup(Error **errp)
{
int thread_count;
@@ -874,6 +885,11 @@ int multifd_save_setup(Error **errp)
if (!migrate_use_multifd()) {
return 0;
}
+ if (!migrate_multifd_is_allowed()) {
+ error_setg(errp, "multifd is not supported by current protocol");
+ return -1;
+ }
+
s = migrate_get_current();
thread_count = migrate_multifd_channels();
multifd_send_state = g_malloc0(sizeof(*multifd_send_state));
@@ -967,7 +983,7 @@ int multifd_load_cleanup(Error **errp)
{
int i;
- if (!migrate_use_multifd()) {
+ if (!migrate_use_multifd() || !migrate_multifd_is_allowed()) {
return 0;
}
multifd_recv_terminate_threads(NULL);
@@ -1123,6 +1139,10 @@ int multifd_load_setup(Error **errp)
if (!migrate_use_multifd()) {
return 0;
}
+ if (!migrate_multifd_is_allowed()) {
+ error_setg(errp, "multifd is not supported by current protocol");
+ return -1;
+ }
thread_count = migrate_multifd_channels();
multifd_recv_state = g_malloc0(sizeof(*multifd_recv_state));
multifd_recv_state->params = g_new0(MultiFDRecvParams, thread_count);
diff --git a/migration/multifd.h b/migration/multifd.h
index 8d6751f5ed8..f62a1becd0b 100644
--- a/migration/multifd.h
+++ b/migration/multifd.h
@@ -13,6 +13,8 @@
#ifndef QEMU_MIGRATION_MULTIFD_H
#define QEMU_MIGRATION_MULTIFD_H
+bool migrate_multifd_is_allowed(void);
+void migrate_protocol_allow_multifd(bool allow);
int multifd_save_setup(Error **errp);
void multifd_save_cleanup(void);
int multifd_load_setup(Error **errp);
--
2.31.1
- [PATCH v2 1/2] migration: allow multifd for socket protocol only,
Li Zhijian <=