linux-kernel - Re: [PATCH v8 2/2] tpm: Add support for event log pointer found in TPM2 ACPI table

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Message-ID: <20200702204411.GB31291@linux.intel.com>
Date:   Thu, 2 Jul 2020 23:44:11 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-security-module@...r.kernel.org,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH v8 2/2] tpm: Add support for event log pointer found in
 TPM2 ACPI table

On Fri, Jun 26, 2020 at 11:39:48AM -0400, Stefan Berger wrote:
> From: Stefan Berger <stefanb@...ux.ibm.com>
> 
> In case a TPM2 is attached, search for a TPM2 ACPI table when trying
> to get the event log from ACPI. If one is found, use it to get the
> start and length of the log area. This allows non-UEFI systems, such
> as SeaBIOS, to pass an event log when using a TPM2.
> 
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> ---
>  drivers/char/tpm/eventlog/acpi.c | 63 +++++++++++++++++++++-----------
>  1 file changed, 42 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c
> index 63ada5e53f13..51312c460335 100644
> --- a/drivers/char/tpm/eventlog/acpi.c
> +++ b/drivers/char/tpm/eventlog/acpi.c
> @@ -49,9 +49,9 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
>  	void __iomem *virt;
>  	u64 len, start;
>  	struct tpm_bios_log *log;
> -
> -	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> -		return -ENODEV;
> +	struct acpi_table_tpm2 *tbl;
> +	struct acpi_tpm2_phy *t2phy;

This is a rather cryptic variable name. Should be either 'phy' or
'tpm2_phy' (I don't care that much which one). Did not spot this
earlier.

/Jarkko