linux-kernel - Re: [PATCH 3/3] tpm: ibmvtpm: Add support for TPM 2

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Message-ID: <a23872ef-aa23-e6b0-4b69-602d79671d4b@linux.vnet.ibm.com>
Date:   Thu, 13 Feb 2020 12:53:38 -0500
From:   Nayna <nayna@...ux.vnet.ibm.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        linux-integrity@...r.kernel.org
Cc:     aik@...abs.ru, david@...son.dropbear.id.au,
        linux-kernel@...r.kernel.org, gcwilson@...ux.ibm.com,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH 3/3] tpm: ibmvtpm: Add support for TPM 2


On 2/4/20 8:27 AM, Stefan Berger wrote:
> From: Stefan Berger <stefanb@...ux.ibm.com>
>
> Support TPM 2 in the IBM vTPM driver. The hypervisor tells us what
> version of TPM is connected through the vio_device_id.
>
> In case a TPM 2 is found, we set the TPM_OPS_AUTO_STARTUP flag to
> have properly initialize the TPM and driver.
>
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> ---
>   drivers/char/tpm/tpm_ibmvtpm.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
> index eee566eddb35..d479d64a65aa 100644
> --- a/drivers/char/tpm/tpm_ibmvtpm.c
> +++ b/drivers/char/tpm/tpm_ibmvtpm.c
> @@ -29,6 +29,7 @@ static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
>
>   static const struct vio_device_id tpm_ibmvtpm_device_table[] = {
>   	{ "IBM,vtpm", "IBM,vtpm"},
> +	{ "IBM,vtpm", "IBM,vtpm20"},
>   	{ "", "" }
>   };
>   MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
> @@ -443,7 +444,7 @@ static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
>   	return (status == 0);
>   }
>
> -static const struct tpm_class_ops tpm_ibmvtpm = {
> +static struct tpm_class_ops tpm_ibmvtpm = {
>   	.recv = tpm_ibmvtpm_recv,
>   	.send = tpm_ibmvtpm_send,
>   	.cancel = tpm_ibmvtpm_cancel,
> @@ -672,6 +673,11 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
>   	if (rc)
>   		goto init_irq_cleanup;
>
> +	if (!strcmp(id->compat, "IBM,vtpm20")) {
> +		chip->flags |= TPM_CHIP_FLAG_TPM2;
> +		tpm_ibmvtpm.flags = TPM_OPS_AUTO_STARTUP;

TPM_OPS_AUTO_STARTUP flag isn't set for vTPM 1.2. What is different in 
case of vTPM 2.0 ?

Thanks & Regards,

      - Nayna