On Thu, Jan 26, 2017 at 09:22:48PM +0100, Michal Such??nek wrote:

This is repeated a few times in the driver so I added memset to quiet
gcc and make behavior deterministic in case the unused fields get some
meaning in the future.

Yep, reserved certainly needs to be zeroed.. Can you send a patch?
memset is overkill...

However, in tpm_ibmvtpm_send the structure is initialized as

	struct ibmvtpm_crq crq;
        __be64 *word = (__be64 *)&crq;
...
        crq.valid = (u8)IBMVTPM_VALID_CMD;
        crq.msg = (u8)VTPM_TPM_COMMAND;
        crq.len = cpu_to_be16(count);
        crq.data = cpu_to_be32(ibmvtpm->rtce_dma_handle);

and submitted with

	rc = ibmvtpm_send_crq(ibmvtpm->vdev, be64_to_cpu(word[0]),
                              be64_to_cpu(word[1]));
meaning it is swapped twice.

No idea, Nayna may know.

My guess is that '__be64 *word' should be 'u64 *word'...

Jason