[Qemu-devel] [PATCH 02/11] Add migrate-set-capabilities and query-migrate-capabilities

[Orit Wasserman <owasserm@redhat.com>]

The management can enable/disable a capability for the next migration by using
migrate-set-apabilities QMP command.
The management can query the current migration capabilities using
query-migrate-capabilities QMP command.
The user can use migrate_set_capability and 'info migrate_capabilities' HMP
commands.

Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 hmp-commands.hx  |   16 +++++++++++++
 hmp.c            |   65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hmp.h            |    2 +
 migration.c      |   46 ++++++++++++++++++++++++++++++++++++++
 migration.h      |    2 +
 monitor.c        |    7 +++++
 qapi-schema.json |   32 ++++++++++++++++++++++++++
 qmp-commands.hx  |   49 ++++++++++++++++++++++++++++++++++++++++
 8 files changed, 219 insertions(+), 0 deletions(-)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 8267237..f4c8495 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -861,6 +861,20 @@ Set maximum tolerated downtime (in seconds) for migration.
 ETEXI
 
     {
+        .name       = "migrate_set_capability",
+        .args_type  = "capability:s,state:b",
+        .params     = "capability state",
+        .help       = "Enable/Disable the usage of a capability for migration",
+        .mhandler.cmd = hmp_migrate_set_capability,
+    },
+
+STEXI
+@item migrate_set_capability @var{capability} @var{state}
+@findex migrate_set_capability
+Enable/Disable the usage of a capability @var{capability} for migration.
+ETEXI
+
+    {
         .name       = "client_migrate_info",
         .args_type  = "protocol:s,hostname:s,port:i?,tls-port:i?,cert-subject:s?",
         .params     = "protocol hostname port tls-port cert-subject",
@@ -1419,6 +1433,8 @@ show user network stack connection states
 show migration status
 @item info migration_supported_capabilities
 show migration supported capabilities
+@item info migrate_capabilities
+show current migration capabilities
 @item info balloon
 show balloon information
 @item info qtree
diff --git a/hmp.c b/hmp.c
index 2ff71a3..463b730 100644
--- a/hmp.c
+++ b/hmp.c
@@ -131,8 +131,21 @@ void hmp_info_mice(Monitor *mon)
 void hmp_info_migrate(Monitor *mon)
 {
     MigrationInfo *info;
+    MigrationCapabilityStatusList *caps, *cap;
 
     info = qmp_query_migrate(NULL);
+    caps = qmp_query_migrate_capabilities(NULL);
+
+    /* do not display parameters during setup */
+    if (info->has_status && caps) {
+        monitor_printf(mon, "capabilities: ");
+        for (cap = caps; cap; cap = cap->next) {
+            monitor_printf(mon, "%s: %s ",
+                           MigrationCapability_lookup[cap->value->capability],
+                           cap->value->state ? "on" : "off");
+        }
+        monitor_printf(mon, "\n");
+    }
 
     if (info->has_status) {
         monitor_printf(mon, "Migration status: %s\n", info->status);
@@ -159,6 +172,7 @@ void hmp_info_migrate(Monitor *mon)
     }
 
     qapi_free_MigrationInfo(info);
+    qapi_free_MigrationCapabilityStatusList(caps);
 }
 
 void hmp_info_migration_supported_capabilities(Monitor *mon)
@@ -182,6 +196,25 @@ void hmp_info_migration_supported_capabilities(Monitor *mon)
     qapi_free_MigrationCapabilityStatusList(caps_list);
 }
 
+void hmp_info_migrate_capabilities(Monitor *mon)
+{
+    MigrationCapabilityStatusList *caps, *cap;
+
+    caps = qmp_query_migrate_capabilities(NULL);
+
+    if (caps) {
+        monitor_printf(mon, "capabilities: ");
+        for (cap = caps; cap; cap = cap->next) {
+            monitor_printf(mon, "%s: %s ",
+                           MigrationCapability_lookup[cap->value->capability],
+                           cap->value->state ? "on" : "off");
+        }
+        monitor_printf(mon, "\n");
+    }
+
+    qapi_free_MigrationCapabilityStatusList(caps);
+}
+
 void hmp_info_cpus(Monitor *mon)
 {
     CpuInfoList *cpu_list, *cpu;
@@ -756,6 +789,38 @@ void hmp_migrate_set_speed(Monitor *mon, const QDict *qdict)
     qmp_migrate_set_speed(value, NULL);
 }
 
+void hmp_migrate_set_capability(Monitor *mon, const QDict *qdict)
+{
+    const char *cap = qdict_get_str(qdict, "capability");
+    bool state = qdict_get_bool(qdict, "state");
+    Error *err = NULL;
+    MigrationCapabilityStatusList *caps = g_malloc0(sizeof(*caps));
+    int i;
+
+    for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) {
+        if (strcmp(cap, MigrationCapability_lookup[i]) == 0) {
+            caps->value = g_malloc0(sizeof(*caps->value));
+            caps->value->capability = i;
+            caps->value->state = state;
+            caps->next = NULL;
+            qmp_migrate_set_capabilities(caps, &err);
+            break;
+        }
+    }
+
+    if (i == MIGRATION_CAPABILITY_MAX) {
+        error_set(&err, QERR_INVALID_PARAMETER, cap);
+    }
+
+    qapi_free_MigrationCapabilityStatusList(caps);
+
+    if (err) {
+        monitor_printf(mon, "migrate_set_parameter: %s\n",
+                       error_get_pretty(err));
+        error_free(err);
+    }
+}
+
 void hmp_set_password(Monitor *mon, const QDict *qdict)
 {
     const char *protocol  = qdict_get_str(qdict, "protocol");
diff --git a/hmp.h b/hmp.h
index 8442c22..f2a890f 100644
--- a/hmp.h
+++ b/hmp.h
@@ -26,6 +26,7 @@ void hmp_info_chardev(Monitor *mon);
 void hmp_info_mice(Monitor *mon);
 void hmp_info_migrate(Monitor *mon);
 void hmp_info_migration_supported_capabilities(Monitor *mon);
+void hmp_info_migrate_capabilities(Monitor *mon);
 void hmp_info_cpus(Monitor *mon);
 void hmp_info_block(Monitor *mon);
 void hmp_info_blockstats(Monitor *mon);
@@ -52,6 +53,7 @@ void hmp_snapshot_blkdev(Monitor *mon, const QDict *qdict);
 void hmp_migrate_cancel(Monitor *mon, const QDict *qdict);
 void hmp_migrate_set_downtime(Monitor *mon, const QDict *qdict);
 void hmp_migrate_set_speed(Monitor *mon, const QDict *qdict);
+void hmp_migrate_set_capability(Monitor *mon, const QDict *qdict);
 void hmp_set_password(Monitor *mon, const QDict *qdict);
 void hmp_expire_password(Monitor *mon, const QDict *qdict);
 void hmp_eject(Monitor *mon, const QDict *qdict);
diff --git a/migration.c b/migration.c
index 35444f7..d1a8d3a 100644
--- a/migration.c
+++ b/migration.c
@@ -113,6 +113,30 @@ uint64_t migrate_max_downtime(void)
     return max_downtime;
 }
 
+MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
+{
+    MigrationCapabilityStatusList *head = NULL;
+    MigrationCapabilityStatusList *caps;
+    MigrationState *s = migrate_get_current();
+    int i;
+
+    for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) {
+        if (head == NULL) {
+            head = g_malloc0(sizeof(*caps));
+            caps = head;
+        } else {
+            caps->next = g_malloc0(sizeof(*caps));
+            caps = caps->next;
+        }
+        caps->value =
+            g_malloc(sizeof(*caps->value));
+        caps->value->capability = i;
+        caps->value->state = s->enabled_capabilities[i];
+    }
+
+    return head;
+}
+
 MigrationInfo *qmp_query_migrate(Error **errp)
 {
     MigrationInfo *info = g_malloc0(sizeof(*info));
@@ -178,6 +202,22 @@ qmp_query_migration_supported_capabilities(Error **errp)
     return caps_list;
 }
 
+void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
+                                  Error **errp)
+{
+    MigrationState *s = migrate_get_current();
+    MigrationCapabilityStatusList *cap;
+
+    if (s->state == MIG_STATE_ACTIVE) {
+        error_set(errp, QERR_MIGRATION_ACTIVE);
+        return;
+    }
+
+    for (cap = params; cap; cap = cap->next) {
+        s->enabled_capabilities[cap->value->capability] = cap->value->state;
+    }
+}
+
 /* shared migration helpers */
 
 static int migrate_fd_cleanup(MigrationState *s)
@@ -387,10 +427,16 @@ static MigrationState *migrate_init(const MigrationParams *params)
 {
     MigrationState *s = migrate_get_current();
     int64_t bandwidth_limit = s->bandwidth_limit;
+    bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
+
+    memcpy(enabled_capabilities, s->enabled_capabilities,
+           sizeof(enabled_capabilities));
 
     memset(s, 0, sizeof(*s));
     s->bandwidth_limit = bandwidth_limit;
     s->params = *params;
+    memcpy(s->enabled_capabilities, enabled_capabilities,
+           sizeof(enabled_capabilities));
 
     s->bandwidth_limit = bandwidth_limit;
     s->state = MIG_STATE_SETUP;
diff --git a/migration.h b/migration.h
index 57572a6..713aae0 100644
--- a/migration.h
+++ b/migration.h
@@ -19,6 +19,7 @@
 #include "notify.h"
 #include "error.h"
 #include "vmstate.h"
+#include "qapi-types.h"
 
 struct MigrationParams {
     bool blk;
@@ -39,6 +40,7 @@ struct MigrationState
     void *opaque;
     MigrationParams params;
     int64_t total_time;
+    bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
 };
 
 void process_incoming_migration(QEMUFile *f);
diff --git a/monitor.c b/monitor.c
index 43f7df5..58d6e2a 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2669,6 +2669,13 @@ static mon_cmd_t info_cmds[] = {
         .mhandler.info = hmp_info_migration_supported_capabilities,
     },
     {
+        .name       = "migrate_capabilities",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show current migration capabilities",
+        .mhandler.info = hmp_info_migrate_capabilities,
+    },
+    {
         .name       = "balloon",
         .args_type  = "",
         .params     = "",
diff --git a/qapi-schema.json b/qapi-schema.json
index 68d0fbb..f38dfc6 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -345,6 +345,38 @@
 { 'command': 'query-migration-supported-capabilities', 'returns': ['MigrationCapabilityStatus'] }
 
 ##
+# @migrate-set-capabilities
+#
+# Enable/Disable the following migration capabilities (like xbzrle)
+#
+# Since: 1.2
+##
+{ 'command': 'migrate-set-capabilities',
+  'data': { 'capabilities': ['MigrationCapabilityStatus'] } }
+
+##
+# @MigrationParameters
+#
+# @capabilities: @MigrationCapabilityStatus list contain current migration
+#                capabilities status
+# Since: 1.2
+##
+{ 'type': 'MigrationParameters',
+  'data': {'capabilities': ['MigrationCapabilityStatus']} }
+
+
+##
+# @query-migrate-capabilities
+#
+# Returns information about the current migration capabilities status
+#
+# Returns: @MigrationCapabilitiesStatus
+#
+# Since: 1.2
+##
+{ 'command': 'query-migrate-capabilities', 'returns':   ['MigrationCapabilityStatus']}
+
+##
 # @MouseInfo:
 #
 # Information about a mouse device.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 16fbcef..e96a993 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2166,6 +2166,55 @@ EQMP
     },
 
 SQMP
+migrate-set-capabilities
+-------
+
+Enable/Disable migration capabilities
+
+- "xbzrle": xbzrle support
+
+Arguments:
+
+Example:
+
+-> { "execute": "migrate-set-capabilities" , "arguments":
+     { "capabilities": [ { "capability": "xbzrle", "state": true } ] } }
+
+EQMP
+
+    {
+        .name       = "migrate_set_capabilities",
+        .args_type  = "capabilities:O",
+        .params     = "capability:s,state:b",
+	.mhandler.cmd_new = qmp_marshal_input_migrate_set_capabilities,
+    },
+SQMP
+query-migrate-capabilities
+-------
+
+Query current migration capabilities
+
+- "capabilities": migration capabilities state
+         - "xbzrle" : XBZRLE state (json-bool)
+
+Arguments:
+
+Example:
+
+-> { "execute": "query-migrate-capabilities" }
+<- { "return": {
+        "capabilities" :  [ { "capability" : "xbzrle", "state" : false } ]
+     }
+   }
+EQMP
+
+    {
+        .name       = "query-migrate-capabilities",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_input_query_migrate_capabilities,
+    },
+
+SQMP
 query-balloon
 -------------
 
-- 
1.7.7.6