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authorMarkus Armbruster <armbru@redhat.com>2017-08-24 10:45:59 +0200
committerMarkus Armbruster <armbru@redhat.com>2017-09-04 13:09:13 +0200
commit00bbf50a50e6d6e1a4542db1c1205291395c4105 (patch)
treebe3ffb2ba802bd2ccff2d71f932e74aa4f186cdd
parenta9a72aeefbd3ef8bcbbeeccaf174ee10db2978ac (diff)
downloadqemu-arm-00bbf50a50e6d6e1a4542db1c1205291395c4105.tar.gz
tpm: Clean up model registration & lookup
We have a strict separation between enum TpmModel and tpm_models[]: * TpmModel may have any number of members. It just happens to have one. * tpm_register_model() uses the first empty slot in tpm_models[]. If you register more than tpm_models[] has space, tpn_register_model() fails. Its caller silently ignores the failure. Register the same TpmModel more than once has no effect other than wasting tpm_models[] slots: tpm_model_is_registered() is happy with the first one it finds. Since we only ever register one model, and tpm_models[] has space for just that one, this contraption even works. Turn tpm_models[] into a straight map from enum TpmType to bool. Much simpler. Cc: Stefan Berger <stefanb@us.ibm.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1503564371-26090-5-git-send-email-armbru@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> [Commit message typo fixed]
-rw-r--r--include/sysemu/tpm_backend.h2
-rw-r--r--tpm.c37
2 files changed, 6 insertions, 33 deletions
diff --git a/include/sysemu/tpm_backend.h b/include/sysemu/tpm_backend.h
index 1d21c6b19b..b0a9731aee 100644
--- a/include/sysemu/tpm_backend.h
+++ b/include/sysemu/tpm_backend.h
@@ -226,7 +226,7 @@ TPMVersion tpm_backend_get_tpm_version(TPMBackend *s);
TPMBackend *qemu_find_tpm(const char *id);
const TPMDriverOps *tpm_get_backend_driver(const char *type);
-int tpm_register_model(enum TpmModel model);
+void tpm_register_model(enum TpmModel model);
void tpm_register_driver(const TPMDriverOps *tdo);
#endif
diff --git a/tpm.c b/tpm.c
index 6f39ec9192..7635fc779b 100644
--- a/tpm.c
+++ b/tpm.c
@@ -24,39 +24,12 @@
static QLIST_HEAD(, TPMBackend) tpm_backends =
QLIST_HEAD_INITIALIZER(tpm_backends);
-
-#define TPM_MAX_MODELS 1
-
static TPMDriverOps const *be_drivers[TPM_TYPE__MAX];
+static bool tpm_models[TPM_MODEL__MAX];
-static enum TpmModel tpm_models[TPM_MAX_MODELS] = {
- TPM_MODEL__MAX,
-};
-
-int tpm_register_model(enum TpmModel model)
-{
- int i;
-
- for (i = 0; i < TPM_MAX_MODELS; i++) {
- if (tpm_models[i] == TPM_MODEL__MAX) {
- tpm_models[i] = model;
- return 0;
- }
- }
- error_report("Could not register TPM model");
- return 1;
-}
-
-static bool tpm_model_is_registered(enum TpmModel model)
+void tpm_register_model(enum TpmModel model)
{
- int i;
-
- for (i = 0; i < TPM_MAX_MODELS; i++) {
- if (tpm_models[i] == model) {
- return true;
- }
- }
- return false;
+ tpm_models[model] = true;
}
const TPMDriverOps *tpm_get_backend_driver(const char *type)
@@ -270,7 +243,7 @@ TPMInfoList *qmp_query_tpm(Error **errp)
TPMInfoList *info, *head = NULL, *cur_item = NULL;
QLIST_FOREACH(drv, &tpm_backends, list) {
- if (!tpm_model_is_registered(drv->fe_model)) {
+ if (!tpm_models[drv->fe_model]) {
continue;
}
info = g_new0(TPMInfoList, 1);
@@ -317,7 +290,7 @@ TpmModelList *qmp_query_tpm_models(Error **errp)
TpmModelList *head = NULL, *prev = NULL, *cur_item;
for (i = 0; i < TPM_MODEL__MAX; i++) {
- if (!tpm_model_is_registered(i)) {
+ if (!tpm_models[i]) {
continue;
}
cur_item = g_new0(TpmModelList, 1);