[Qemu-devel] [PATCH v10 26/28] qmp: add query-sev-capabilities command

[Brijesh Singh]

The command can be used by libvirt to query the SEV capabilities.

Cc: "Daniel P. Berrangé" <address@hidden>
Cc: "Dr. David Alan Gilbert" <address@hidden>
Cc: Markus Armbruster <address@hidden>
Signed-off-by: Brijesh Singh <address@hidden>
---
 monitor.c             |  7 +++++++
 qapi-schema.json      | 42 ++++++++++++++++++++++++++++++++++++++++++
 target/i386/monitor.c |  5 +++++
 3 files changed, 54 insertions(+)

diff --git a/monitor.c b/monitor.c
index d0ebd5906d9d..26d86685a9f9 100644
--- a/monitor.c
+++ b/monitor.c
@@ -985,6 +985,7 @@ static void qmp_unregister_commands_hack(void)
     qmp_unregister_command(&qmp_commands, "rtc-reset-reinjection");
     qmp_unregister_command(&qmp_commands, "query-sev");
     qmp_unregister_command(&qmp_commands, "query-sev-launch-measure");
+    qmp_unregister_command(&qmp_commands, "query-sev-capabilities");
 #endif
 #ifndef TARGET_S390X
     qmp_unregister_command(&qmp_commands, "dump-skeys");
@@ -4171,6 +4172,12 @@ SevLaunchMeasureInfo *qmp_query_sev_launch_measure(Error 
**errp)
     error_setg(errp, QERR_FEATURE_DISABLED, "query-sev-launch-measure");
     return NULL;
 }
+
+SevCapability *qmp_query_sev_capabilities(Error **errp)
+{
+    error_setg(errp, QERR_FEATURE_DISABLED, "query-sev-capabilities");
+    return NULL;
+}
 #endif
 
 #ifndef TARGET_S390X
diff --git a/qapi-schema.json b/qapi-schema.json
index facf2138df6b..9a50d9b8017e 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3279,3 +3279,45 @@
 #
 ##
 { 'command': 'query-sev-launch-measure', 'returns': 'SevLaunchMeasureInfo' }
+
+##
+# @SevCapability:
+#
+# The struct describes capability for a Secure Encrypted Virtualization
+# feature.
+#
+# @pdh:  Platform Diffie-Hellman key
+#
+# @cert-chain:  PDH certificate chain
+#
+# @cbitpos: C-bit location in page table entry
+#
+# @reduced-phys-bits: Number of physical Address bit reduction when SEV is
+#                     enabled
+#
+# Since: 2.12
+##
+{ 'struct': 'SevCapability',
+  'data': { 'pdh': 'str',
+            'cert-chain': 'str',
+            'cbitpos': 'int',
+            'reduced-phys-bits': 'int'} }
+
+##
+# @query-sev-capabilities:
+#
+# This command is used to get the SEV capabilities and supported on AMD
+# X86 platform only.
+#
+# Returns: a list of SevCapability objects.
+#
+# Since: 2.12
+#
+# Example:
+#
+# -> { "execute": "query-sev-capabilities" }
+# <- { "return": { "pdh": "8CCDD8DDD", "cert-chain": "888CCCDDDEE",
+#                  "cbitpos": 47, "reduced-phys-bits": 5}}
+#
+##
+{ 'command': 'query-sev-capabilities', 'returns': 'SevCapability' }
diff --git a/target/i386/monitor.c b/target/i386/monitor.c
index 577d50eebaaa..1b55dd0fff88 100644
--- a/target/i386/monitor.c
+++ b/target/i386/monitor.c
@@ -737,3 +737,8 @@ SevLaunchMeasureInfo *qmp_query_sev_launch_measure(Error 
**errp)
 
     return info;
 }
+
+SevCapability *qmp_query_sev_capabilities(Error **errp)
+{
+    return NULL;
+}
-- 
2.14.3