Re: [PATCH 3/3] Add support for TPM devices over I2C bus

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

On 3/21/23 01:30, Ninad Palsule wrote:
> Qemu already supports devices attached to ISA and sysbus. This drop adds
> support for the I2C bus attached TPM devices. I2C model only supports
> TPM2 protocol.
> 

> +
> +/* Send data to TPM */
> +static inline void tpm_tis_i2c_tpm_send(TPMStateI2C *i2cst)
> +{
> +    if ((i2cst->operation == OP_SEND) && (i2cst->offset > 1)) {
> +        uint16_t tis_reg;
> +        uint32_t data;
> +        int      i;
> +
> +        tis_reg = tpm_tis_i2c_to_tis_reg(i2cst->data[0], &i2cst->size);
> +
> +        /* Index 0 is always a register */
> +        for (i = 1; i < i2cst->offset; i++) {
> +            data = (i2cst->data[i] & 0xff);
> +            tpm_tis_write_data(&i2cst->state, tis_reg, data, 1);
> +        }


I think there should be tpm_tis_set_data_buffer function that you can call rather than transferring the data byte-by-byte.

Thanks for the series!

   Stefan