[Qemu-devel] [PATCH v6 13/47] Migration commands

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Create QEMU_VM_COMMAND section type for sending commands from
source to destination.  These commands are not intended to convey
guest state but to control the migration process.

For use in postcopy.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 include/migration/migration.h |  1 +
 include/sysemu/sysemu.h       |  7 +++++++
 savevm.c                      | 47 +++++++++++++++++++++++++++++++++++++++++++
 trace-events                  |  1 +
 4 files changed, 56 insertions(+)

diff --git a/include/migration/migration.h b/include/migration/migration.h
index 7a6f521..f221c99 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -34,6 +34,7 @@
 #define QEMU_VM_SECTION_FULL         0x04
 #define QEMU_VM_SUBSECTION           0x05
 #define QEMU_VM_VMDESCRIPTION        0x06
+#define QEMU_VM_COMMAND              0x07
 
 struct MigrationParams {
     bool blk;
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 8402e6e..e82b205 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -82,6 +82,11 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict);
 
 void qemu_announce_self(void);
 
+/* Subcommands for QEMU_VM_COMMAND */
+enum qemu_vm_cmd {
+    MIG_CMD_INVALID = 0,   /* Must be 0 */
+};
+
 bool qemu_savevm_state_blocked(Error **errp);
 void qemu_savevm_state_begin(QEMUFile *f,
                              const MigrationParams *params);
@@ -90,6 +95,8 @@ int qemu_savevm_state_iterate(QEMUFile *f);
 void qemu_savevm_state_complete_precopy(QEMUFile *f);
 void qemu_savevm_state_cancel(void);
 uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size);
+void qemu_savevm_command_send(QEMUFile *f, enum qemu_vm_cmd command,
+                              uint16_t len, uint8_t *data);
 int qemu_loadvm_state(QEMUFile *f);
 
 typedef enum DisplayType
diff --git a/savevm.c b/savevm.c
index eba9174..2dc5fbb 100644
--- a/savevm.c
+++ b/savevm.c
@@ -602,6 +602,24 @@ static void vmstate_save(QEMUFile *f, SaveStateEntry *se, QJSON *vmdesc)
     vmstate_save_state(f, se->vmsd, se->opaque, vmdesc);
 }
 
+
+/* Send a 'QEMU_VM_COMMAND' type element with the command
+ * and associated data.
+ */
+void qemu_savevm_command_send(QEMUFile *f,
+                              enum qemu_vm_cmd command,
+                              uint16_t len,
+                              uint8_t *data)
+{
+    qemu_put_byte(f, QEMU_VM_COMMAND);
+    qemu_put_be16(f, (uint16_t)command);
+    qemu_put_be16(f, len);
+    if (len) {
+        qemu_put_buffer(f, data, len);
+    }
+    qemu_fflush(f);
+}
+
 bool qemu_savevm_state_blocked(Error **errp)
 {
     SaveStateEntry *se;
@@ -927,6 +945,29 @@ static SaveStateEntry *find_se(const char *idstr, int instance_id)
     return NULL;
 }
 
+/*
+ * Process an incoming 'QEMU_VM_COMMAND'
+ * negative return on error (will issue error message)
+ */
+static int loadvm_process_command(QEMUFile *f)
+{
+    uint16_t com;
+    uint16_t len;
+
+    com = qemu_get_be16(f);
+    len = qemu_get_be16(f);
+
+    trace_loadvm_process_command(com, len);
+    switch (com) {
+
+    default:
+        error_report("VM_COMMAND 0x%x unknown (len 0x%x)", com, len);
+        return -1;
+    }
+
+    return 0;
+}
+
 typedef struct LoadStateEntry {
     QLIST_ENTRY(LoadStateEntry) entry;
     SaveStateEntry *se;
@@ -1042,6 +1083,12 @@ int qemu_loadvm_state(QEMUFile *f)
                 goto out;
             }
             break;
+        case QEMU_VM_COMMAND:
+            ret = loadvm_process_command(f);
+            if (ret < 0) {
+                goto out;
+            }
+            break;
         default:
             error_report("Unknown savevm section type %d", section_type);
             ret = -EINVAL;
diff --git a/trace-events b/trace-events
index 39957fe..4d093dc 100644
--- a/trace-events
+++ b/trace-events
@@ -1171,6 +1171,7 @@ vmware_setmode(uint32_t w, uint32_t h, uint32_t bpp) "%dx%d @ %d bpp"
 qemu_loadvm_state_section(unsigned int section_type) "%d"
 qemu_loadvm_state_section_partend(uint32_t section_id) "%u"
 qemu_loadvm_state_section_startfull(uint32_t section_id, const char *idstr, uint32_t instance_id, uint32_t version_id) "%u(%s) %u %u"
+loadvm_process_command(uint16_t com, uint16_t len) "com=0x%x len=%d"
 savevm_section_start(const char *id, unsigned int section_id) "%s, section_id %u"
 savevm_section_end(const char *id, unsigned int section_id, int ret) "%s, section_id %u -> %d"
 savevm_state_begin(void) ""
-- 
2.1.0