tpm-be: update optional function pointers

QEMU code doesn't generally have assert() for mandatory
callbacks/function pointers, probably because the crash is pretty
obvious. Document the methods instead of going into the code.

Make get_tpm_options() mandatory to implement (since all
backend implementation have it).

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/sysemu/tpm_backend.h b/include/sysemu/tpm_backend.h
index 904e5b1026..ce8dee58cf 100644
--- a/include/sysemu/tpm_backend.h
+++ b/include/sysemu/tpm_backend.h
@@ -65,15 +65,18 @@ struct TPMBackendClass {
 
     TPMBackend *(*create)(QemuOpts *opts, const char *id);
 
-    /* start up the TPM on the backend */
+    /* start up the TPM on the backend - optional */
     int (*startup_tpm)(TPMBackend *t);
 
+    /* optional */
     void (*reset)(TPMBackend *t);
 
     void (*cancel_cmd)(TPMBackend *t);
 
+    /* optional */
     bool (*get_tpm_established_flag)(TPMBackend *t);
 
+    /* optional */
     int (*reset_tpm_established_flag)(TPMBackend *t, uint8_t locty);
 
     TPMVersion (*get_tpm_version)(TPMBackend *t);