Patchwork [v5] savevm: Fix no_migrate

login
register
mail settings
Submitter Alex Williamson
Date Jan. 11, 2011, 9:39 p.m.
Message ID <20110111213731.20822.21354.stgit@s20.home>
Download mbox | patch
Permalink /patch/78452/
State New
Headers show

Comments

Alex Williamson - Jan. 11, 2011, 9:39 p.m.
The no_migrate save state flag is currently only checked in the
last phase of migration.  This means that we potentially waste
a lot of time and bandwidth with the live state handlers before
we ever check the no_migrate flags.  The error message printed
when we catch a non-migratable device doesn't get printed for
a detached migration.  And, no_migrate does nothing to prevent
an incoming migration to a target that includes a non-migratable
device.  This attempts to fix all of these.

One notable difference in behavior is that an outgoing migration
now checks for non-migratable devices before ever connecting to
the target system.  This means the target will remain listening
rather than exit from failure.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

v5:
 - change qemu_savevm_state_blocked() to return bool
 - Daniel confirmed libvirt will not have a problem with the behavior
   change on the target end.

 migration.c |    4 ++++
 savevm.c    |   40 ++++++++++++++++++++++++++--------------
 sysemu.h    |    1 +
 3 files changed, 31 insertions(+), 14 deletions(-)
Michael S. Tsirkin - Jan. 11, 2011, 10:39 p.m.
On Tue, Jan 11, 2011 at 02:39:43PM -0700, Alex Williamson wrote:
> The no_migrate save state flag is currently only checked in the
> last phase of migration.  This means that we potentially waste
> a lot of time and bandwidth with the live state handlers before
> we ever check the no_migrate flags.  The error message printed
> when we catch a non-migratable device doesn't get printed for
> a detached migration.  And, no_migrate does nothing to prevent
> an incoming migration to a target that includes a non-migratable
> device.  This attempts to fix all of these.
> 
> One notable difference in behavior is that an outgoing migration
> now checks for non-migratable devices before ever connecting to
> the target system.  This means the target will remain listening
> rather than exit from failure.
> 
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
> 
> v5:
>  - change qemu_savevm_state_blocked() to return bool
>  - Daniel confirmed libvirt will not have a problem with the behavior
>    change on the target end.
> 
>  migration.c |    4 ++++
>  savevm.c    |   40 ++++++++++++++++++++++++++--------------
>  sysemu.h    |    1 +
>  3 files changed, 31 insertions(+), 14 deletions(-)
> 
> diff --git a/migration.c b/migration.c
> index e5ba51c..d593b1d 100644
> --- a/migration.c
> +++ b/migration.c
> @@ -88,6 +88,10 @@ int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
>          return -1;
>      }
>  
> +    if (qemu_savevm_state_blocked(mon)) {
> +        return -1;
> +    }
> +
>      if (strstart(uri, "tcp:", &p)) {
>          s = tcp_start_outgoing_migration(mon, p, max_throttle, detach,
>                                           blk, inc);
> diff --git a/savevm.c b/savevm.c
> index 90aa237..fcd8db4 100644
> --- a/savevm.c
> +++ b/savevm.c
> @@ -1401,19 +1401,13 @@ static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
>      return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
>  }
>  
> -static int vmstate_save(QEMUFile *f, SaveStateEntry *se)
> +static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
>  {
> -    if (se->no_migrate) {
> -        return -1;
> -    }
> -
>      if (!se->vmsd) {         /* Old style */
>          se->save_state(f, se->opaque);
> -        return 0;
> +        return;
>      }
>      vmstate_save_state(f,se->vmsd, se->opaque);
> -
> -    return 0;
>  }
>  
>  #define QEMU_VM_FILE_MAGIC           0x5145564d
> @@ -1427,6 +1421,20 @@ static int vmstate_save(QEMUFile *f, SaveStateEntry *se)
>  #define QEMU_VM_SECTION_FULL         0x04
>  #define QEMU_VM_SUBSECTION           0x05
>  
> +bool qemu_savevm_state_blocked(Monitor *mon)
> +{
> +    SaveStateEntry *se;
> +
> +    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
> +        if (se->no_migrate) {
> +            monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
> +                           se->idstr);
> +            return true;
> +        }
> +    }
> +    return false;
> +}
> +
>  int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
>                              int shared)
>  {
> @@ -1508,7 +1516,6 @@ int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
>  int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
>  {
>      SaveStateEntry *se;
> -    int r;
>  
>      cpu_synchronize_all_states();
>  
> @@ -1541,11 +1548,7 @@ int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
>          qemu_put_be32(f, se->instance_id);
>          qemu_put_be32(f, se->version_id);
>  
> -        r = vmstate_save(f, se);
> -        if (r < 0) {
> -            monitor_printf(mon, "cannot migrate with device '%s'\n", se->idstr);
> -            return r;
> -        }
> +        vmstate_save(f, se);
>      }
>  
>      qemu_put_byte(f, QEMU_VM_EOF);
> @@ -1575,6 +1578,11 @@ static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
>      saved_vm_running = vm_running;
>      vm_stop(0);
>  
> +    if (qemu_savevm_state_blocked(mon)) {
> +        ret = -EINVAL;
> +        goto out;
> +    }
> +
>      ret = qemu_savevm_state_begin(mon, f, 0, 0);
>      if (ret < 0)
>          goto out;
> @@ -1692,6 +1700,10 @@ int qemu_loadvm_state(QEMUFile *f)
>      unsigned int v;
>      int ret;
>  
> +    if (qemu_savevm_state_blocked(default_mon)) {
> +        return -EINVAL;
> +    }
> +
>      v = qemu_get_be32(f);
>      if (v != QEMU_VM_FILE_MAGIC)
>          return -EINVAL;
> diff --git a/sysemu.h b/sysemu.h
> index d8fceec..0c969f2 100644
> --- a/sysemu.h
> +++ b/sysemu.h
> @@ -75,6 +75,7 @@ void qemu_announce_self(void);
>  
>  void main_loop_wait(int nonblocking);
>  
> +bool qemu_savevm_state_blocked(Monitor *mon);
>  int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
>                              int shared);
>  int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f);

Patch

diff --git a/migration.c b/migration.c
index e5ba51c..d593b1d 100644
--- a/migration.c
+++ b/migration.c
@@ -88,6 +88,10 @@  int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
         return -1;
     }
 
+    if (qemu_savevm_state_blocked(mon)) {
+        return -1;
+    }
+
     if (strstart(uri, "tcp:", &p)) {
         s = tcp_start_outgoing_migration(mon, p, max_throttle, detach,
                                          blk, inc);
diff --git a/savevm.c b/savevm.c
index 90aa237..fcd8db4 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1401,19 +1401,13 @@  static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
 }
 
-static int vmstate_save(QEMUFile *f, SaveStateEntry *se)
+static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
 {
-    if (se->no_migrate) {
-        return -1;
-    }
-
     if (!se->vmsd) {         /* Old style */
         se->save_state(f, se->opaque);
-        return 0;
+        return;
     }
     vmstate_save_state(f,se->vmsd, se->opaque);
-
-    return 0;
 }
 
 #define QEMU_VM_FILE_MAGIC           0x5145564d
@@ -1427,6 +1421,20 @@  static int vmstate_save(QEMUFile *f, SaveStateEntry *se)
 #define QEMU_VM_SECTION_FULL         0x04
 #define QEMU_VM_SUBSECTION           0x05
 
+bool qemu_savevm_state_blocked(Monitor *mon)
+{
+    SaveStateEntry *se;
+
+    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
+        if (se->no_migrate) {
+            monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
+                           se->idstr);
+            return true;
+        }
+    }
+    return false;
+}
+
 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
                             int shared)
 {
@@ -1508,7 +1516,6 @@  int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
 {
     SaveStateEntry *se;
-    int r;
 
     cpu_synchronize_all_states();
 
@@ -1541,11 +1548,7 @@  int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
         qemu_put_be32(f, se->instance_id);
         qemu_put_be32(f, se->version_id);
 
-        r = vmstate_save(f, se);
-        if (r < 0) {
-            monitor_printf(mon, "cannot migrate with device '%s'\n", se->idstr);
-            return r;
-        }
+        vmstate_save(f, se);
     }
 
     qemu_put_byte(f, QEMU_VM_EOF);
@@ -1575,6 +1578,11 @@  static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
     saved_vm_running = vm_running;
     vm_stop(0);
 
+    if (qemu_savevm_state_blocked(mon)) {
+        ret = -EINVAL;
+        goto out;
+    }
+
     ret = qemu_savevm_state_begin(mon, f, 0, 0);
     if (ret < 0)
         goto out;
@@ -1692,6 +1700,10 @@  int qemu_loadvm_state(QEMUFile *f)
     unsigned int v;
     int ret;
 
+    if (qemu_savevm_state_blocked(default_mon)) {
+        return -EINVAL;
+    }
+
     v = qemu_get_be32(f);
     if (v != QEMU_VM_FILE_MAGIC)
         return -EINVAL;
diff --git a/sysemu.h b/sysemu.h
index d8fceec..0c969f2 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -75,6 +75,7 @@  void qemu_announce_self(void);
 
 void main_loop_wait(int nonblocking);
 
+bool qemu_savevm_state_blocked(Monitor *mon);
 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
                             int shared);
 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f);