[edk2-devel] [PATCH v2 1/2] MdeModulePkg/Variable: Return GetVariable() attr if EFI_BUFFER_TOO_SMALL

[Michael Kubacki]

That's a good point. I will send a v3 with the change added to VariablePei.

Thanks,
Michael

On 3/27/2020 7:39 AM, Wang, Jian J wrote:
> Michael,
> 
> I know this is related to UEFI spec. But I think the PEI variable driver should be
> consistent with RT driver's behavior. Otherwise it will cause confusion. I suggest
> to make similar change to PEI variable driver.
> 
> Regards,
> Jian
> 
>> -----Original Message-----
>> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Michael
>> Kubacki
>> Sent: Wednesday, March 25, 2020 11:00 AM
>> To: devel at edk2.groups.io
>> Cc: Bret Barkelew <Bret.Barkelew at microsoft.com>; Gao, Liming
>> <liming.gao at intel.com>; Kinney, Michael D <michael.d.kinney at intel.com>;
>> Wang, Jian J <jian.j.wang at intel.com>; Wu, Hao A <hao.a.wu at intel.com>
>> Subject: [edk2-devel] [PATCH v2 1/2] MdeModulePkg/Variable: Return
>> GetVariable() attr if EFI_BUFFER_TOO_SMALL
>>
>> From: Michael Kubacki <michael.kubacki at microsoft.com>
>>
>> REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2062
>>
>> The UEFI specification v2.8 Errata A Section 8.2 "GetVariable()"
>> "Attributes" parameter description states:
>>
>> "If not NULL, a pointer to the memory location to return the
>>   attributes bitmask for the variable. See 'Related Definitions.'
>>   If not NULL, then Attributes is set on output both when
>>   EFI_SUCCESS and when EFI_BUFFER_TOO_SMALL is returned."
>>
>> The attributes were previously only returned from the implementation
>> in Variable.c on EFI_SUCCESS. They are now returned on EFI_SUCCESS or
>> EFI_BUFFER_TOO_SMALL according to spec.
>>
>> Cc: Bret Barkelew <Bret.Barkelew at microsoft.com>
>> Cc: Liming Gao <liming.gao at intel.com>
>> Cc: Michael D Kinney <michael.d.kinney at intel.com>
>> Cc: Jian J Wang <jian.j.wang at intel.com>
>> Cc: Hao A Wu <hao.a.wu at intel.com>
>> Signed-off-by: Michael Kubacki <michael.kubacki at microsoft.com>
>> ---
>>   MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c              | 10
>> +++++++---
>>   MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c |
>> 10 ++++++----
>>   2 files changed, 13 insertions(+), 7 deletions(-)
>>
>> diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
>> b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
>> index d23aea4bc712..1e71fc642c76 100644
>> --- a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
>> +++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
>> @@ -18,6 +18,8 @@
>>
>>   Copyright (c) 2006 - 2020, Intel Corporation. All rights reserved.<BR>
>>   (C) Copyright 2015-2018 Hewlett Packard Enterprise Development LP<BR>
>> +Copyright (c) Microsoft Corporation.<BR>
>> +
>>   SPDX-License-Identifier: BSD-2-Clause-Patent
>>
>>   **/
>> @@ -2379,9 +2381,6 @@ VariableServiceGetVariable (
>>       }
>>
>>       CopyMem (Data, GetVariableDataPtr (Variable.CurrPtr,
>> mVariableModuleGlobal->VariableGlobal.AuthFormat), VarDataSize);
>> -    if (Attributes != NULL) {
>> -      *Attributes = Variable.CurrPtr->Attributes;
>> -    }
>>
>>       *DataSize = VarDataSize;
>>       UpdateVariableInfo (VariableName, VendorGuid, Variable.Volatile, TRUE,
>> FALSE, FALSE, FALSE, &gVariableInfo);
>> @@ -2395,6 +2394,11 @@ VariableServiceGetVariable (
>>     }
>>
>>   Done:
>> +  if (Status == EFI_SUCCESS || Status == EFI_BUFFER_TOO_SMALL) {
>> +    if (Attributes != NULL && Variable.CurrPtr != NULL) {
>> +      *Attributes = Variable.CurrPtr->Attributes;
>> +    }
>> +  }
>>     ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal-
>>> VariableGlobal.VariableServicesLock);
>>     return Status;
>>   }
>> diff --git
>> a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
>> b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
>> index 2cf0ed32ae55..ca833fb0244d 100644
>> ---
>> a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
>> +++
>> b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
>> @@ -14,6 +14,7 @@
>>     InitCommunicateBuffer() is really function to check the variable data size.
>>
>>   Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>
>> +Copyright (c) Microsoft Corporation.<BR>
>>   SPDX-License-Identifier: BSD-2-Clause-Patent
>>
>>   **/
>> @@ -642,10 +643,6 @@ FindVariableInRuntimeCache (
>>           }
>>
>>           CopyMem (Data, GetVariableDataPtr (RtPtrTrack.CurrPtr,
>> mVariableAuthFormat), TempDataSize);
>> -        if (Attributes != NULL) {
>> -          *Attributes = RtPtrTrack.CurrPtr->Attributes;
>> -        }
>> -
>>           *DataSize = TempDataSize;
>>
>>           UpdateVariableInfo (VariableName, VendorGuid, RtPtrTrack.Volatile, TRUE,
>> FALSE, FALSE, TRUE, &mVariableInfo);
>> @@ -661,6 +658,11 @@ FindVariableInRuntimeCache (
>>     }
>>
>>   Done:
>> +  if (Status == EFI_SUCCESS || Status == EFI_BUFFER_TOO_SMALL) {
>> +    if (Attributes != NULL && RtPtrTrack.CurrPtr != NULL) {
>> +      *Attributes = RtPtrTrack.CurrPtr->Attributes;
>> +    }
>> +  }
>>     mVariableRuntimeCacheReadLock = FALSE;
>>
>>     return Status;
>> --
>> 2.16.3.windows.1
>>
>>
>>
> 
> 
> 
> 

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