linux-kernel - Re: [PATCH v2 2/3] vTPM: reformat event log to be byte-aligned

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Message-ID: <561D50DA.9090605@gmail.com>
Date:	Tue, 13 Oct 2015 13:43:38 -0500
From:	Ashley Lai <ashleydlai@...il.com>
To:	"Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>,
	tpmdd-devel@...ts.sourceforge.net
Cc:	Peter Huewe <PeterHuewe@....de>, Ashley Lai <ashley@...leylai.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Vicky Lo <honclo2014@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] vTPM: reformat event log to be byte-aligned



On 10/07/2015 07:11 PM, Hon Ching(Vicky) Lo wrote:
> The event log generated by OpenFirmware in PowerPC is 4-byte aligned.
> This patch reformats the log to be byte-aligned for the Linux client.
>
> Signed-off-by: Hon Ching(Vicky) Lo <honclo@...ux.vnet.ibm.com>
> ---
>   arch/powerpc/kernel/prom_init.c |   13 ++++++++++++-
>   1 files changed, 12 insertions(+), 1 deletions(-)
>
> diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
> index b9b6bb1..8a5c248 100644
> --- a/arch/powerpc/kernel/prom_init.c
> +++ b/arch/powerpc/kernel/prom_init.c
> @@ -1417,8 +1417,9 @@ static void __init prom_instantiate_sml(void)
>   {
>   	phandle ibmvtpm_node;
>   	ihandle ibmvtpm_inst;
> -	u32 entry = 0, size = 0;
> +	u32 entry = 0, size = 0, succ = 0;
>   	u64 base;
> +	__be32 val;
>   
>   	prom_debug("prom_instantiate_sml: start...\n");
>   
> @@ -1433,6 +1434,16 @@ static void __init prom_instantiate_sml(void)
>   		return;
>   	}
>   
> +	if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
> +			 &val, sizeof(val)) != PROM_ERROR) {
> +		if (call_prom_ret("call-method", 2, 2, &succ,
> +				  ADDR("reformat-sml-to-efi-alignment"),
> +				  ibmvtpm_inst) != 0 || succ == 0) {

reformat-sml-to-efi-alignment is something new just added in the firmware?  I don't remember seeing it before.


> +			prom_printf("Reformat SML to EFI alignment failed\n");
> +			return;
> +		}
> +	}
> +
>   	if (call_prom_ret("call-method", 2, 2, &size,
>   			  ADDR("sml-get-handover-size"),
>   			  ibmvtpm_inst) != 0 || size == 0) {

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