sev/i386: add sev_get_capabilities()

The function can be used to get the current SEV capabilities.
The capabilities include platform diffie-hellman key (pdh) and certificate
chain. The key can be provided to the external entities which wants to
establish a trusted channel between SEV firmware and guest owner.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/target/i386/monitor.c b/target/i386/monitor.c
index 8a786fb79a..011419eba2 100644
--- a/target/i386/monitor.c
+++ b/target/i386/monitor.c
@@ -717,6 +717,13 @@ SevLaunchMeasureInfo *qmp_query_sev_launch_measure(Error **errp)
 
 SevCapability *qmp_query_sev_capabilities(Error **errp)
 {
-    error_setg(errp, "SEV feature is not available");
-    return NULL;
+    SevCapability *data;
+
+    data = sev_get_capabilities();
+    if (!data) {
+        error_setg(errp, "SEV feature is not available");
+        return NULL;
+    }
+
+    return data;
 }