Commit ad4aca69 authored by Stefan Berger's avatar Stefan Berger Committed by Stefan Berger
Browse files

tpm_tis: Return TPM_VERSION_UNSPEC in case of BE failure 



In case the backend has a failure, such as the tpm_emulator's CMD_INIT
failing, the TIS goes into failure mode and does not respond to reads
or writes to MMIO registers. In this case we need to prevent the ACPI
table from being added and the straight-forward way is to indicate that
there's no known TPM version being used.

Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: default avatarMarc-André Lureau <marcandre.lureau@redhat.com>
parent 17b1af77

hw/tpm/tpm_tis.c

+4 −0
Original line number Diff line number Diff line
@@ -1008,6 +1008,10 @@ TPMVersion tpm_tis_get_tpm_version(Object *obj) 
{

    TPMState *s = TPM(obj);



    if (tpm_backend_had_startup_error(s->be_driver)) {

        return TPM_VERSION_UNSPEC;

    }



    return tpm_backend_get_tpm_version(s->be_driver);

}