Re: [PATCH] MdeModulePkg/EsrtDxe: allocate ESRT table from RtServicesData memory

["Zeng, Star" <star.zeng@intel.com>]

Ard,

What is the real case you met that has firmware to access ESRT configuration table at runtime?

I am thinking about a possible solution with current situation.
The consumer can cache ESRT configuration table by a gEfiSystemResourceTableGuid even group notification.


Thanks,
Star
-----Original Message-----
From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org] 
Sent: Friday, October 19, 2018 11:48 AM
To: Zeng, Star <star.zeng@intel.com>; Peter Jones <pjones@redhat.com>
Cc: edk2-devel@lists.01.org; Dong, Eric <eric.dong@intel.com>; Leif Lindholm <leif.lindholm@linaro.org>; Kinney, Michael D <michael.d.kinney@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>
Subject: Re: [PATCH] MdeModulePkg/EsrtDxe: allocate ESRT table from RtServicesData memory

(+ Peter)

On 19 October 2018 at 11:46, Zeng, Star <star.zeng@intel.com> wrote:
> Hi Ard,
>
> Thanks for the patch.
>
> Cc more people who knows ESRT.
>
> UEFI 2.7 chapter 23.3:
> The ESRT shall be stored in memory of type EfiBootServicesData.
>
> Seeming, we need update UEFI spec if firmware really needs access ESRT configuration table at runtime.
>
>
> Thanks,
> Star
> -----Original Message-----
> From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org]
> Sent: Friday, October 19, 2018 11:25 AM
> To: edk2-devel@lists.01.org
> Cc: Zeng, Star <star.zeng@intel.com>; Dong, Eric 
> <eric.dong@intel.com>; Leif Lindholm <leif.lindholm@linaro.org>; Ard 
> Biesheuvel <ard.biesheuvel@linaro.org>
> Subject: Re: [PATCH] MdeModulePkg/EsrtDxe: allocate ESRT table from 
> RtServicesData memory
>
> On 19 October 2018 at 10:54, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
>> Given that the firmware itself may access the ESRT table when the OS 
>> invokes the UpdateCapsule () boot service,
>
> *runtime* service
>
>> it requires a virtual mapping
>> and so it needs to be allocated from RtServicesData memory.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.1
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>>  MdeModulePkg/Universal/EsrtDxe/EsrtDxe.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/MdeModulePkg/Universal/EsrtDxe/EsrtDxe.c
>> b/MdeModulePkg/Universal/EsrtDxe/EsrtDxe.c
>> index cab8d69e35ad..66266a44cec9 100644
>> --- a/MdeModulePkg/Universal/EsrtDxe/EsrtDxe.c
>> +++ b/MdeModulePkg/Universal/EsrtDxe/EsrtDxe.c
>> @@ -577,7 +577,8 @@ EsrtReadyToBootEventNotify (
>>      goto EXIT;
>>    }
>>
>> -  EsrtTable = AllocatePool(sizeof(EFI_SYSTEM_RESOURCE_TABLE) + 
>> NonFmpRepositorySize + FmpRepositorySize);
>> +  EsrtTable = AllocateRuntimePool (sizeof(EFI_SYSTEM_RESOURCE_TABLE) +
>> +                                   NonFmpRepositorySize + 
>> + FmpRepositorySize);
>>    if (EsrtTable == NULL) {
>>      DEBUG ((EFI_D_ERROR, "Esrt table memory allocation failure\n"));
>>      goto EXIT;
>> --
>> 2.17.1
>>