Hi ----- Original Message ----- > On Tue, 2017-10-10 at 00:56 +0200, Marc-André Lureau wrote: > > Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com> > > --- > > include/sysemu/tpm_backend.h | 2 +- > > hw/tpm/tpm_emulator.c | 12 +++--------- > > hw/tpm/tpm_passthrough.c | 9 +++------ > > tpm.c | 3 ++- > > 4 files changed, 9 insertions(+), 17 deletions(-) > > > > diff --git a/include/sysemu/tpm_backend.h > > b/include/sysemu/tpm_backend.h > > index 594bb50782..881be97ee3 100644 > > --- a/include/sysemu/tpm_backend.h > > +++ b/include/sysemu/tpm_backend.h > > @@ -64,7 +64,7 @@ struct TPMBackendClass { > > /* get a descriptive text of the backend to display to the user > > */ > > const char *desc; > > > > - TPMBackend *(*create)(QemuOpts *opts, const char *id); > > + TPMBackend *(*create)(QemuOpts *opts); > > > > /* start up the TPM on the backend - optional */ > > int (*startup_tpm)(TPMBackend *t); > > diff --git a/hw/tpm/tpm_emulator.c b/hw/tpm/tpm_emulator.c > > index 36454837b3..315819329b 100644 > > --- a/hw/tpm/tpm_emulator.c > > +++ b/hw/tpm/tpm_emulator.c > > @@ -453,22 +453,16 @@ err: > > return -1; > > } > > > > -static TPMBackend *tpm_emulator_create(QemuOpts *opts, const char > > *id) > > +static TPMBackend *tpm_emulator_create(QemuOpts *opts) > > { > > TPMBackend *tb = TPM_BACKEND(object_new(TYPE_TPM_EMULATOR)); > > > > - tb->id = g_strdup(id); > > - > > if (tpm_emulator_handle_device_opts(TPM_EMULATOR(tb), opts)) { > > - goto err_exit; > > + object_unref(OBJECT(tb)); > > + return NULL; > > } > > > > return tb; > > - > > -err_exit: > > - object_unref(OBJECT(tb)); > > - > > - return NULL; > > } > > > > static TpmTypeOptions *tpm_emulator_get_tpm_options(TPMBackend *tb) > > diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c > > index 9326cbfdc9..7371d50739 100644 > > --- a/hw/tpm/tpm_passthrough.c > > +++ b/hw/tpm/tpm_passthrough.c > > @@ -284,13 +284,10 @@ > > tpm_passthrough_handle_device_opts(TPMPassthruState *tpm_pt, QemuOpts > > *opts) > > return 1; > > } > > > > -static TPMBackend *tpm_passthrough_create(QemuOpts *opts, const char > > *id) > > +static TPMBackend *tpm_passthrough_create(QemuOpts *opts) > > { > > Object *obj = object_new(TYPE_TPM_PASSTHROUGH); > > - TPMBackend *tb = TPM_BACKEND(obj); > > - TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb); > > - > > - tb->id = g_strdup(id); > > + TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(obj); > > > > if (tpm_passthrough_handle_device_opts(tpm_pt, opts)) { > > goto err_exit; > > @@ -301,7 +298,7 @@ static TPMBackend > > *tpm_passthrough_create(QemuOpts *opts, const char *id) > > goto err_exit; > > } > > > > - return tb; > > + return TPM_BACKEND(obj); > > > > err_exit: > > object_unref(obj); > > diff --git a/tpm.c b/tpm.c > > index a46ee5f144..37298f3f03 100644 > > --- a/tpm.c > > +++ b/tpm.c > > @@ -129,11 +129,12 @@ static int tpm_init_tpmdev(void *dummy, > > QemuOpts *opts, Error **errp) > > return 1; > > } > > > > - drv = be->create(opts, id); > > + drv = be->create(opts); > > if (!drv) { > > return 1; > > } > > > > + drv->id = g_strdup(id); > I kind of oppose this change, instead what about adding new TPMBackend > api say - TPMBackend* tpm_backend_create(const char *type, const > QemuOpts *opts), that should handle this common code, and returns the > newly instantiated backend object.
That would be a more complicated refactoring than what I propose here, which is basic common code refactoring. To clarify your proposal, make a follow-up patch? Another interesting approach would be to implement USER_CREATABLE (I have an experimental patch for that). This allows to use -object tpm-passthrough,id=..,path=.. and will change the way backends are created & initialized.