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SubjectRe: [PATCH v2 2/3] vTPM: reformat event log to be byte-aligned
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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@linux.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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