target/i386/sev: Move qmp_sev_inject_launch_secret() to sev.c

Move qmp_sev_inject_launch_secret() from monitor.c to sev.c
and make sev_inject_launch_secret() static. We don't need the
stub anymore, remove it.

Previously with binaries built without SEV, management layer
was getting an empty response:

  { "execute": "sev-inject-launch-secret",
    "arguments": { "packet-header": "mypkt", "secret": "mypass", "gpa": 4294959104 }
  }
  {
      "return": {
      }
  }

Now the response is explicit, mentioning the feature is disabled:

  { "execute": "sev-inject-launch-secret",
          "arguments": { "packet-header": "mypkt", "secret": "mypass", "gpa": 4294959104 }
  }
  {
      "error": {
          "class": "GenericError",
          "desc": "this feature or command is not currently supported"
      }
  }

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20211007161716.453984-19-philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 038fa56058..072bb6f0fd 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -973,6 +973,37 @@ int sev_inject_launch_secret(const char *packet_hdr, const char *secret,
     return 0;
 }
 
+#define SEV_SECRET_GUID "4c2eb361-7d9b-4cc3-8081-127c90d3d294"
+struct sev_secret_area {
+    uint32_t base;
+    uint32_t size;
+};
+
+void qmp_sev_inject_launch_secret(const char *packet_hdr,
+                                  const char *secret,
+                                  bool has_gpa, uint64_t gpa,
+                                  Error **errp)
+{
+    if (!sev_enabled()) {
+        error_setg(errp, "SEV not enabled for guest");
+        return;
+    }
+    if (!has_gpa) {
+        uint8_t *data;
+        struct sev_secret_area *area;
+
+        if (!pc_system_ovmf_table_find(SEV_SECRET_GUID, &data, NULL)) {
+            error_setg(errp, "SEV: no secret area found in OVMF,"
+                       " gpa must be specified.");
+            return;
+        }
+        area = (struct sev_secret_area *)data;
+        gpa = area->base;
+    }
+
+    sev_inject_launch_secret(packet_hdr, secret, gpa, errp);
+}
+
 static int
 sev_es_parse_reset_block(SevInfoBlock *info, uint32_t *addr)
 {