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

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Message-ID: <561EC71C.2090609@gmail.com>
Date:	Wed, 14 Oct 2015 16:20:28 -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 10/14/2015 04:15 PM, Ashley Lai wrote:
>
>
> 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.
Never mind.  I missed the check before that.  Looks good to me.


>
>>
>>>
>>>>
>>
>

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