From 38e0735eb76a1479917ef3501a208d4f70998494 Mon Sep 17 00:00:00 2001
From: Anthony Liguori <aliguori@us.ibm.com>
Date: Mon, 14 Nov 2011 15:09:44 -0600
Subject: [PATCH] ivshmem: use migration blockers to prevent live migration in
peer mode (v2)
Now when you try to migrate with ivshmem, you get a proper QMP error:
(qemu) migrate tcp:localhost:1025
Migration is disabled when using feature 'peer mode' in device 'ivshmem'
(qemu)
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
hw/ivshmem.c | 12 +++++++++++-
qerror.c | 4 ++++
qerror.h | 3 +++
savevm.c | 25 -------------------------
4 files changed, 18 insertions(+), 26 deletions(-)
diff --git a/hw/ivshmem.c b/hw/ivshmem.c
index 242fbea3a5..a3a0e98451 100644
--- a/hw/ivshmem.c
+++ b/hw/ivshmem.c
@@ -18,6 +18,8 @@
#include "pci.h"
#include "msix.h"
#include "kvm.h"
+#include "migration.h"
+#include "qerror.h"
#include <sys/mman.h>
#include <sys/types.h>
@@ -78,6 +80,8 @@ typedef struct IVShmemState {
uint32_t features;
EventfdEntry *eventfd_table;
+ Error *migration_blocker;
+
char * shmobj;
char * sizearg;
char * role;
@@ -646,7 +650,8 @@ static int pci_ivshmem_init(PCIDevice *dev)
}
if (s->role_val == IVSHMEM_PEER) {
- register_device_unmigratable(&s->dev.qdev, "ivshmem", s);
+ error_set(&s->migration_blocker, QERR_DEVICE_FEATURE_BLOCKS_MIGRATION, "ivshmem", "peer mode");
+ migrate_add_blocker(s->migration_blocker);
}
pci_conf = s->dev.config;
@@ -741,6 +746,11 @@ static int pci_ivshmem_uninit(PCIDevice *dev)
{
IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
+ if (s->migration_blocker) {
+ migrate_del_blocker(s->migration_blocker);
+ error_free(s->migration_blocker);
+ }
+
memory_region_destroy(&s->ivshmem_mmio);
memory_region_del_subregion(&s->bar, &s->ivshmem);
memory_region_destroy(&s->ivshmem);
diff --git a/qerror.c b/qerror.c
index 4b48b39660..8e30e2dc1e 100644
--- a/qerror.c
+++ b/qerror.c
@@ -72,6 +72,10 @@ static const QErrorStringTable qerror_table[] = {
.error_fmt = QERR_DEVICE_IN_USE,
.desc = "Device '%(device)' is in use",
},
+ {
+ .error_fmt = QERR_DEVICE_FEATURE_BLOCKS_MIGRATION,
+ .desc = "Migration is disabled when using feature '%(feature)' in device '%(device)'",
+ },
{
.error_fmt = QERR_DEVICE_LOCKED,
.desc = "Device '%(device)' is locked",
diff --git a/qerror.h b/qerror.h
index d4bfcfd167..7e2eebf983 100644
--- a/qerror.h
+++ b/qerror.h
@@ -72,6 +72,9 @@ QError *qobject_to_qerror(const QObject *obj);
#define QERR_DEVICE_IN_USE \
"{ 'class': 'DeviceInUse', 'data': { 'device': %s } }"
+#define QERR_DEVICE_FEATURE_BLOCKS_MIGRATION \
+ "{ 'class': 'DeviceFeatureBlocksMigration', 'data': { 'device': %s, 'feature': %s } }"
+
#define QERR_DEVICE_LOCKED \
"{ 'class': 'DeviceLocked', 'data': { 'device': %s } }"
diff --git a/savevm.c b/savevm.c
index bee16c0b7b..f53cd4c154 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1255,31 +1255,6 @@ void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
}
}
-/* mark a device as not to be migrated, that is the device should be
- unplugged before migration */
-void register_device_unmigratable(DeviceState *dev, const char *idstr,
- void *opaque)
-{
- SaveStateEntry *se;
- char id[256] = "";
-
- if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
- char *path = dev->parent_bus->info->get_dev_path(dev);
- if (path) {
- pstrcpy(id, sizeof(id), path);
- pstrcat(id, sizeof(id), "/");
- g_free(path);
- }
- }
- pstrcat(id, sizeof(id), idstr);
-
- QTAILQ_FOREACH(se, &savevm_handlers, entry) {
- if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
- se->no_migrate = 1;
- }
- }
-}
-
int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
const VMStateDescription *vmsd,
void *opaque, int alias_id,
--
2.30.2