sev/i386: hmp: add 'info sev' command

The command can be used to show the SEV information when memory
encryption is enabled on AMD platform.

Cc: Eric Blake <eblake@redhat.com>
Cc: "Daniel P. Berrangé" <berrange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Reviewed-by: N"Dr. David Alan Gilbert" <dgilbert@redhat.com>
Signed-off-by: NBrijesh Singh <brijesh.singh@amd.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hmp-commands-info.hx

@@ -867,6 +867,22 @@ Display the amount of initially allocated and present hotpluggable (if
 enabled) memory in bytes.
 ETEXI
 
+#if defined(TARGET_I386)
+    {
+        .name       = "sev",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show SEV information",
+        .cmd        = hmp_info_sev,
+    },
+#endif
+
+STEXI
+@item info sev
+@findex info sev
+Show SEV information.
+ETEXI
+
 STEXI
 @end table
 ETEXI

hmp.h

@@ -143,5 +143,6 @@ void hmp_info_ramblock(Monitor *mon, const QDict *qdict);
 void hmp_hotpluggable_cpus(Monitor *mon, const QDict *qdict);
 void hmp_info_vm_generation_id(Monitor *mon, const QDict *qdict);
 void hmp_info_memory_size_summary(Monitor *mon, const QDict *qdict);
+void hmp_info_sev(Monitor *mon, const QDict *qdict);
 
 #endif

target/i386/monitor.c

@@ -29,6 +29,7 @@
 #include "qapi/qmp/qdict.h"
 #include "hw/i386/pc.h"
 #include "sysemu/kvm.h"
+#include "sysemu/sev.h"
 #include "hmp.h"
 #include "qapi/error.h"
 #include "sev_i386.h"
@@ -677,3 +678,22 @@ SevInfo *qmp_query_sev(Error **errp)
 
     return info;
 }
+
+void hmp_info_sev(Monitor *mon, const QDict *qdict)
+{
+    SevInfo *info = sev_get_info();
+
+    if (info && info->enabled) {
+        monitor_printf(mon, "handle: %d\n", info->handle);
+        monitor_printf(mon, "state: %s\n", SevState_str(info->state));
+        monitor_printf(mon, "build: %d\n", info->build_id);
+        monitor_printf(mon, "api version: %d.%d\n",
+                       info->api_major, info->api_minor);
+        monitor_printf(mon, "debug: %s\n",
+                       info->policy & SEV_POLICY_NODBG ? "off" : "on");
+        monitor_printf(mon, "key-sharing: %s\n",
+                       info->policy & SEV_POLICY_NOKS ? "off" : "on");
+    } else {
+        monitor_printf(mon, "SEV is not enabled\n");
+    }
+}