mini-os/tpmback: Replace UUID field with opaque pointer

Instead of only recording the UUID field, which may not be of interest
to all tpmback implementations, provide a user-settable opaque pointer
associated with the tpmback instance.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>

2 files changed, 8 insertions, 2 deletions

diff --git a/stubdom/vtpmmgr/init.c b/stubdom/vtpmmgr/init.c
index 00dd9f3516..33ac1525fc 100644
--- a/stubdom/vtpmmgr/init.c
+++ b/stubdom/vtpmmgr/init.c
@@ -436,6 +436,12 @@ egress:
    return status;
 }
 
+/* Set up the opaque field to contain a pointer to the UUID */
+static void set_opaque_to_uuid(domid_t domid, unsigned int handle)
+{
+   tpmback_set_opaque(domid, handle, tpmback_get_uuid(domid, handle));
+}
+
 TPM_RESULT vtpmmgr_init(int argc, char** argv) {
    TPM_RESULT status = TPM_SUCCESS;
 
@@ -462,7 +468,7 @@ TPM_RESULT vtpmmgr_init(int argc, char** argv) {
    }
 
    //Setup tpmback device
-   init_tpmback(NULL, NULL);
+   init_tpmback(set_opaque_to_uuid, NULL);
 
    //Setup tpm access
    switch(opts.tpmdriver) {
diff --git a/stubdom/vtpmmgr/vtpmmgr.c b/stubdom/vtpmmgr/vtpmmgr.c
index 563f4e8c58..270ca8a93c 100644
--- a/stubdom/vtpmmgr/vtpmmgr.c
+++ b/stubdom/vtpmmgr/vtpmmgr.c
@@ -61,7 +61,7 @@ void main_loop(void) {
       tpmcmd->resp = respbuf;
 
       /* Process the command */
-      vtpmmgr_handle_cmd(tpmcmd->uuid, tpmcmd);
+      vtpmmgr_handle_cmd(tpmcmd->opaque, tpmcmd);
 
       /* Send response */
       tpmback_resp(tpmcmd);