linux-kernel - Re: [PATCH] EFI/stub: tpm: enable tpm eventlog function for ARM64 platform

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Date:   Thu, 7 Nov 2019 16:03:05 +0800
From:   kongxinwei <kong.kongxinwei@...ilicon.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
CC:     Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        "Kate Stewart" <kstewart@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steve Capper <steve.capper@....com>,
        linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>, <zoucao@...ux.alibaba.com>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>
Subject: Re: [PATCH] EFI/stub: tpm: enable tpm eventlog function for ARM64
 platform

On 2019/11/6 22:59, Ard Biesheuvel wrote:
> On Wed, 6 Nov 2019 at 15:56, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
>>
>> On Tue, 5 Nov 2019 at 09:29, Xinwei Kong <kong.kongxinwei@...ilicon.com> wrote:
>>>
>>> this patch gets tpm eventlog information such as device boot status,event guid
>>> and so on, which will be from bios stage. it use "efi_retrieve_tpm2_eventlog"
>>> functions to get it for ARM64 platorm.
>>>
>>> Signed-off-by: Xinwei Kong <kong.kongxinwei@...ilicon.com>
>>> Signed-off-by: Zou Cao <zoucao@...ux.alibaba.com>
>>> ---
>>>  drivers/firmware/efi/libstub/arm-stub.c | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c
>>> index c382a48..37c8f81 100644
>>> --- a/drivers/firmware/efi/libstub/arm-stub.c
>>> +++ b/drivers/firmware/efi/libstub/arm-stub.c
>>> @@ -139,6 +139,8 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
>>>         if (status != EFI_SUCCESS)
>>>                 goto fail;
>>>
>>> +       efi_retrieve_tpm2_eventlog(sys_table);
>>> +
>>
>> This function allocates memory, so calling it should be deferred until
>> after we relocate the kernel, to prevent these allocations from using
>> up space that we'd rather use for the kernel.
>>
>> Does it work for you if we move this call further down, right before
>> the call to efi_enable_reset_attack_mitigation()? Please confirm.
>>

ok，I will confirm it and send V2 version patch :

> 
> Also, your S-o-b chain is incorrect. If Zou Cao provided you with the
> patch, please credit her/him as the author (using git --reset-author)
> and move your S-o-b last. If Zou Cao was a co-author [which seems
> unlikely for a single line patch], use Co-developed-by+Signed-off-by.
> In any case, the S-o-b of the person sending out the patch via email
> should come last.
> 
I will deal it.
> .
>