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

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Message-ID: <561EC5DB.4030300@gmail.com>
Date:	Wed, 14 Oct 2015 16:15:07 -0500
From:	Ashley Lai <ashleydlai@...il.com>
To:	"Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>
Cc:	tpmdd-devel@...ts.sourceforge.net, 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 10/13/2015 04:27 PM, Hon Ching(Vicky) Lo wrote:
> On Tue, 2015-10-13 at 13:43 -0500, Ashley Lai wrote:
>> 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.
> Yes, it's new.  Our new firmware version will support it.
Looks like this will break the backward compatibility with the new 
kernel running on the older firmware.

>
>>
>>>
>

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