Re: [Qemu-devel] [PATCH 25/42] tpm-be: report error instead of front-end

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

On 10/09/2017 06:56 PM, Marc-André Lureau wrote:
> Backend can give more accurate error description, and lift out the job
> from the frontend.
>
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

> ---
>   include/sysemu/tpm_backend.h | 3 ++-
>   backends/tpm.c               | 3 ++-
>   hw/tpm/tpm_tis.c             | 4 +---
>   3 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/include/sysemu/tpm_backend.h b/include/sysemu/tpm_backend.h
> index dd4fb288ea..51dfc0de9c 100644
> --- a/include/sysemu/tpm_backend.h
> +++ b/include/sysemu/tpm_backend.h
> @@ -100,12 +100,13 @@ enum TpmType tpm_backend_get_type(TPMBackend *s);
>    * @s: the backend to initialized
>    * @tpmif: TPM interface
>    * @datacb: callback for sending data to frontend
> + * @errp: a pointer to return the #Error object if an error occurs.
>    *
>    * Initialize the backend with the given variables.
>    *
>    * Returns 0 on success.
>    */
> -int tpm_backend_init(TPMBackend *s, TPMIf *tpmif);
> +int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp);
>
>   /**
>    * tpm_backend_startup_tpm:
> diff --git a/backends/tpm.c b/backends/tpm.c
> index 58f823d54c..7b108bd5d8 100644
> --- a/backends/tpm.c
> +++ b/backends/tpm.c
> @@ -54,9 +54,10 @@ enum TpmType tpm_backend_get_type(TPMBackend *s)
>       return k->type;
>   }
>
> -int tpm_backend_init(TPMBackend *s, TPMIf *tpmif)
> +int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp)
>   {
>       if (s->tpmif) {
> +        error_setg(errp, "TPM backend '%s' is already initialized", s->id);
>           return -1;
>       }
>
> diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
> index 355427ab29..2fbc760730 100644
> --- a/hw/tpm/tpm_tis.c
> +++ b/hw/tpm/tpm_tis.c
> @@ -1069,9 +1069,7 @@ static void tpm_tis_realizefn(DeviceState *dev, Error **errp)
>
>       s->be_driver->fe_model = TPM_MODEL_TPM_TIS;
>
> -    if (tpm_backend_init(s->be_driver, TPM_IF(s))) {
> -        error_setg(errp, "tpm_tis: backend driver with id %s could not be "
> -                   "initialized", s->backend);
> +    if (tpm_backend_init(s->be_driver, TPM_IF(s), errp)) {
>           return;
>       }
>