[Qemu-devel] [PATCH v3 03/14] migration.json: add AMD SEV specific migration parameters

["Singh, Brijesh" <brijesh.singh@amd.com>]

AMD SEV migration flow requires that target machine's public Diffie-Hellman
key (PDH) and certificate chain must be passed before initiating the guest
migration. User can use QMP 'migrate-set-parameters' to pass the certificate
chain. The certificate chain will be used while creating the outgoing
encryption context.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---

I was able to pass the certificate chain through the HMP but somehow
QMP socket interface is not working for me. If anyone has any tips on
what I am missing in the patch then please let me know. In meantime,
I will also continue my investigation on why its not working for me.

 migration/migration.c | 61 +++++++++++++++++++++++++++++++++++++++++++
 monitor/hmp-cmds.c    | 18 +++++++++++++
 qapi/migration.json   | 41 ++++++++++++++++++++++++++---
 3 files changed, 116 insertions(+), 4 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 8a607fe1e2..de66a0eb7e 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -783,6 +783,12 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
     params->announce_rounds = s->parameters.announce_rounds;
     params->has_announce_step = true;
     params->announce_step = s->parameters.announce_step;
+    params->has_sev_pdh = true;
+    params->sev_pdh = g_strdup(s->parameters.sev_pdh);
+    params->has_sev_plat_cert = true;
+    params->sev_plat_cert = g_strdup(s->parameters.sev_plat_cert);
+    params->has_sev_amd_cert = true;
+    params->sev_amd_cert = g_strdup(s->parameters.sev_amd_cert);
 
     return params;
 }
@@ -1289,6 +1295,18 @@ static void migrate_params_test_apply(MigrateSetParameters *params,
     if (params->has_announce_step) {
         dest->announce_step = params->announce_step;
     }
+    if (params->has_sev_pdh) {
+        assert(params->sev_pdh->type == QTYPE_QSTRING);
+        dest->sev_pdh = g_strdup(params->sev_pdh->u.s);
+    }
+    if (params->has_sev_plat_cert) {
+        assert(params->sev_plat_cert->type == QTYPE_QSTRING);
+        dest->sev_plat_cert = g_strdup(params->sev_plat_cert->u.s);
+    }
+    if (params->has_sev_amd_cert) {
+        assert(params->sev_amd_cert->type == QTYPE_QSTRING);
+        dest->sev_amd_cert = g_strdup(params->sev_amd_cert->u.s);
+    }
 }
 
 static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
@@ -1390,6 +1408,21 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
     if (params->has_announce_step) {
         s->parameters.announce_step = params->announce_step;
     }
+    if (params->has_sev_pdh) {
+        g_free(s->parameters.sev_pdh);
+        assert(params->sev_pdh->type == QTYPE_QSTRING);
+        s->parameters.sev_pdh = g_strdup(params->sev_pdh->u.s);
+    }
+    if (params->has_sev_plat_cert) {
+        g_free(s->parameters.sev_plat_cert);
+        assert(params->sev_plat_cert->type == QTYPE_QSTRING);
+        s->parameters.sev_plat_cert = g_strdup(params->sev_plat_cert->u.s);
+    }
+    if (params->has_sev_amd_cert) {
+        g_free(s->parameters.sev_amd_cert);
+        assert(params->sev_amd_cert->type == QTYPE_QSTRING);
+        s->parameters.sev_amd_cert = g_strdup(params->sev_amd_cert->u.s);
+    }
 }
 
 void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
@@ -1410,6 +1443,27 @@ void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
         params->tls_hostname->type = QTYPE_QSTRING;
         params->tls_hostname->u.s = strdup("");
     }
+    /* TODO Rewrite "" to null instead */
+    if (params->has_sev_pdh
+        && params->sev_pdh->type == QTYPE_QNULL) {
+        qobject_unref(params->sev_pdh->u.n);
+        params->sev_pdh->type = QTYPE_QSTRING;
+        params->sev_pdh->u.s = strdup("");
+    }
+    /* TODO Rewrite "" to null instead */
+    if (params->has_sev_plat_cert
+        && params->sev_plat_cert->type == QTYPE_QNULL) {
+        qobject_unref(params->sev_plat_cert->u.n);
+        params->sev_plat_cert->type = QTYPE_QSTRING;
+        params->sev_plat_cert->u.s = strdup("");
+    }
+    /* TODO Rewrite "" to null instead */
+    if (params->has_sev_amd_cert
+        && params->sev_amd_cert->type == QTYPE_QNULL) {
+        qobject_unref(params->sev_amd_cert->u.n);
+        params->sev_amd_cert->type = QTYPE_QSTRING;
+        params->sev_amd_cert->u.s = strdup("");
+    }
 
     migrate_params_test_apply(params, &tmp);
 
@@ -3466,6 +3520,9 @@ static void migration_instance_finalize(Object *obj)
     qemu_mutex_destroy(&ms->qemu_file_lock);
     g_free(params->tls_hostname);
     g_free(params->tls_creds);
+    g_free(params->sev_pdh);
+    g_free(params->sev_plat_cert);
+    g_free(params->sev_amd_cert);
     qemu_sem_destroy(&ms->rate_limit_sem);
     qemu_sem_destroy(&ms->pause_sem);
     qemu_sem_destroy(&ms->postcopy_pause_sem);
@@ -3507,6 +3564,10 @@ static void migration_instance_init(Object *obj)
     params->has_announce_rounds = true;
     params->has_announce_step = true;
 
+    params->sev_pdh = g_strdup("");
+    params->sev_plat_cert = g_strdup("");
+    params->sev_amd_cert = g_strdup("");
+
     qemu_sem_init(&ms->postcopy_pause_sem, 0);
     qemu_sem_init(&ms->postcopy_pause_rp_sem, 0);
     qemu_sem_init(&ms->rp_state.rp_sem, 0);
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 5ca3ebe942..354219f27a 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -1872,6 +1872,24 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
         p->has_announce_step = true;
         visit_type_size(v, param, &p->announce_step, &err);
         break;
+    case MIGRATION_PARAMETER_SEV_PDH:
+        p->has_sev_pdh = true;
+        p->sev_pdh = g_new0(StrOrNull, 1);
+        p->sev_pdh->type = QTYPE_QSTRING;
+        visit_type_str(v, param, &p->sev_pdh->u.s, &err);
+        break;
+    case MIGRATION_PARAMETER_SEV_PLAT_CERT:
+        p->has_sev_plat_cert = true;
+        p->sev_plat_cert = g_new0(StrOrNull, 1);
+        p->sev_plat_cert->type = QTYPE_QSTRING;
+        visit_type_str(v, param, &p->sev_plat_cert->u.s, &err);
+        break;
+    case MIGRATION_PARAMETER_SEV_AMD_CERT:
+        p->has_sev_amd_cert = true;
+        p->sev_amd_cert = g_new0(StrOrNull, 1);
+        p->sev_amd_cert->type = QTYPE_QSTRING;
+        visit_type_str(v, param, &p->sev_amd_cert->u.s, &err);
+        break;
     default:
         assert(0);
     }
diff --git a/qapi/migration.json b/qapi/migration.json
index 9cfbaf8c6c..bb07995d2c 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -580,6 +580,15 @@
 # @max-cpu-throttle: maximum cpu throttle percentage.
 #                    Defaults to 99. (Since 3.1)
 #
+# @sev-pdh: The target host platform diffie-hellman key encoded in base64
+#           (Since 4.2)
+#
+# @sev-plat-cert: The target host platform certificate chain encoded in base64
+#                 (Since 4.2)
+#
+# @sev-amd-cert: AMD certificate chain which include ASK and OCA encoded in
+#                base64 (Since 4.2)
+#
 # Since: 2.4
 ##
 { 'enum': 'MigrationParameter',
@@ -592,7 +601,7 @@
            'downtime-limit', 'x-checkpoint-delay', 'block-incremental',
            'multifd-channels',
            'xbzrle-cache-size', 'max-postcopy-bandwidth',
-           'max-cpu-throttle' ] }
+           'max-cpu-throttle', 'sev-pdh', 'sev-plat-cert', 'sev-amd-cert' ] }
 
 ##
 # @MigrateSetParameters:
@@ -682,6 +691,15 @@
 # @max-cpu-throttle: maximum cpu throttle percentage.
 #                    The default value is 99. (Since 3.1)
 #
+# @sev-pdh: The target host platform diffie-hellman key encoded in base64
+#           (Since 4.2)
+#
+# @sev-plat-cert: The target host platform certificate chain encoded in base64
+#                 (Since 4.2)
+#
+# @sev-amd-cert: AMD certificate chain which include ASK and OCA encoded in
+#                base64 (Since 4.2)
+#
 # Since: 2.4
 ##
 # TODO either fuse back into MigrationParameters, or make
@@ -707,7 +725,10 @@
             '*multifd-channels': 'int',
             '*xbzrle-cache-size': 'size',
             '*max-postcopy-bandwidth': 'size',
-	    '*max-cpu-throttle': 'int' } }
+            '*max-cpu-throttle': 'int',
+            '*sev-pdh':'StrOrNull',
+            '*sev-plat-cert': 'StrOrNull',
+            '*sev-amd-cert' : 'StrOrNull' } }
 
 ##
 # @migrate-set-parameters:
@@ -817,6 +838,15 @@
 #                    Defaults to 99.
 #                     (Since 3.1)
 #
+# @sev-pdh: The target host platform diffie-hellman key encoded in base64
+#           (Since 4.2)
+#
+# @sev-plat-cert: The target host platform certificate chain encoded in base64
+#                 (Since 4.2)
+#
+# @sev-amd-cert: AMD certificate chain which include ASK and OCA encoded in
+#                base64 (Since 4.2)
+#
 # Since: 2.4
 ##
 { 'struct': 'MigrationParameters',
@@ -839,8 +869,11 @@
             '*block-incremental': 'bool' ,
             '*multifd-channels': 'uint8',
             '*xbzrle-cache-size': 'size',
-	    '*max-postcopy-bandwidth': 'size',
-            '*max-cpu-throttle':'uint8'} }
+            '*max-postcopy-bandwidth': 'size',
+            '*max-cpu-throttle':'uint8',
+            '*sev-pdh':'str',
+            '*sev-plat-cert': 'str',
+            '*sev-amd-cert' : 'str'} }
 
 ##
 # @query-migrate-parameters:
-- 
2.17.1