Replace the call to and implementation of the function
FpdtAllocateReservedMemoryBelow4G() with a call to
AllocatePeiAccessiblePages, which boils down to the same on X64,
but does not crash non-X64 systems that lack memory below 4 GB.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
Note that the ZeroMem() call is dropped, but it is redundant anyway, given
that the subsequent CopyMem() call supersedes it immediately.
MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c | 45 ++------------------
1 file changed, 4 insertions(+), 41 deletions(-)
diff --git a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
index 71d624fc9ce9..b1f09710b65c 100644
--- a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
+++ b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
@@ -165,46 +165,6 @@ IsKnownID (
}
}
-/**
- Allocate EfiReservedMemoryType below 4G memory address.
-
- This function allocates EfiReservedMemoryType below 4G memory address.
-
- @param[in] Size Size of memory to allocate.
-
- @return Allocated address for output.
-
-**/
-VOID *
-FpdtAllocateReservedMemoryBelow4G (
- IN UINTN Size
- )
-{
- UINTN Pages;
- EFI_PHYSICAL_ADDRESS Address;
- EFI_STATUS Status;
- VOID *Buffer;
-
- Buffer = NULL;
- Pages = EFI_SIZE_TO_PAGES (Size);
- Address = 0xffffffff;
-
- Status = gBS->AllocatePages (
- AllocateMaxAddress,
- EfiReservedMemoryType,
- Pages,
- &Address
- );
- ASSERT_EFI_ERROR (Status);
-
- if (!EFI_ERROR (Status)) {
- Buffer = (VOID *) (UINTN) Address;
- ZeroMem (Buffer, Size);
- }
-
- return Buffer;
-}
-
/**
Allocate buffer for Boot Performance table.
@@ -348,7 +308,10 @@ AllocateBootPerformanceTable (
//
// Fail to allocate at specified address, continue to allocate at any address.
//
- mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) FpdtAllocateReservedMemoryBelow4G (BootPerformanceDataSize);
+ mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) AllocatePeiAccessiblePages (
+ EfiReservedMemoryType,
+ EFI_SIZE_TO_PAGES (BootPerformanceDataSize)
+ );
}
DEBUG ((DEBUG_INFO, "DxeCorePerformanceLib: ACPI Boot Performance Table address = 0x%x\n", mAcpiBootPerformanceTable));
--
2.17.0
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On 05/24/18 11:09, Ard Biesheuvel wrote:
> Replace the call to and implementation of the function
> FpdtAllocateReservedMemoryBelow4G() with a call to
> AllocatePeiAccessiblePages, which boils down to the same on X64,
> but does not crash non-X64 systems that lack memory below 4 GB.
>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
> Note that the ZeroMem() call is dropped, but it is redundant anyway, given
> that the subsequent CopyMem() call supersedes it immediately.
I'm not sure the ZeroMem() is redundant. The allocation size -- before rounding up to full pages -- is computed like this:
BootPerformanceDataSize = sizeof (BOOT_PERFORMANCE_TABLE) + mPerformanceLength + PcdGet32 (PcdExtFpdtBootRecordPadSize);
if (SmmCommData != NULL && SmmBootRecordData != NULL) {
BootPerformanceDataSize += SmmBootRecordDataSize;
}
ZeroMem() covers all of the above, but the CopyMem() calls don't seem to cover the optional padding (from the PCD).
I'm unsure if that matters, of course.
The patch looks good to me otherwise.
Thanks
Laszlo
>
> MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c | 45 ++------------------
> 1 file changed, 4 insertions(+), 41 deletions(-)
>
> diff --git a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
> index 71d624fc9ce9..b1f09710b65c 100644
> --- a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
> +++ b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
> @@ -165,46 +165,6 @@ IsKnownID (
> }
> }
>
> -/**
> - Allocate EfiReservedMemoryType below 4G memory address.
> -
> - This function allocates EfiReservedMemoryType below 4G memory address.
> -
> - @param[in] Size Size of memory to allocate.
> -
> - @return Allocated address for output.
> -
> -**/
> -VOID *
> -FpdtAllocateReservedMemoryBelow4G (
> - IN UINTN Size
> - )
> -{
> - UINTN Pages;
> - EFI_PHYSICAL_ADDRESS Address;
> - EFI_STATUS Status;
> - VOID *Buffer;
> -
> - Buffer = NULL;
> - Pages = EFI_SIZE_TO_PAGES (Size);
> - Address = 0xffffffff;
> -
> - Status = gBS->AllocatePages (
> - AllocateMaxAddress,
> - EfiReservedMemoryType,
> - Pages,
> - &Address
> - );
> - ASSERT_EFI_ERROR (Status);
> -
> - if (!EFI_ERROR (Status)) {
> - Buffer = (VOID *) (UINTN) Address;
> - ZeroMem (Buffer, Size);
> - }
> -
> - return Buffer;
> -}
> -
> /**
> Allocate buffer for Boot Performance table.
>
> @@ -348,7 +308,10 @@ AllocateBootPerformanceTable (
> //
> // Fail to allocate at specified address, continue to allocate at any address.
> //
> - mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) FpdtAllocateReservedMemoryBelow4G (BootPerformanceDataSize);
> + mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) AllocatePeiAccessiblePages (
> + EfiReservedMemoryType,
> + EFI_SIZE_TO_PAGES (BootPerformanceDataSize)
> + );
> }
> DEBUG ((DEBUG_INFO, "DxeCorePerformanceLib: ACPI Boot Performance Table address = 0x%x\n", mAcpiBootPerformanceTable));
>
>
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On 24 May 2018 at 14:49, Laszlo Ersek <lersek@redhat.com> wrote:
> On 05/24/18 11:09, Ard Biesheuvel wrote:
>> Replace the call to and implementation of the function
>> FpdtAllocateReservedMemoryBelow4G() with a call to
>> AllocatePeiAccessiblePages, which boils down to the same on X64,
>> but does not crash non-X64 systems that lack memory below 4 GB.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.1
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>> Note that the ZeroMem() call is dropped, but it is redundant anyway, given
>> that the subsequent CopyMem() call supersedes it immediately.
>
> I'm not sure the ZeroMem() is redundant. The allocation size -- before rounding up to full pages -- is computed like this:
>
> BootPerformanceDataSize = sizeof (BOOT_PERFORMANCE_TABLE) + mPerformanceLength + PcdGet32 (PcdExtFpdtBootRecordPadSize);
> if (SmmCommData != NULL && SmmBootRecordData != NULL) {
> BootPerformanceDataSize += SmmBootRecordDataSize;
> }
>
> ZeroMem() covers all of the above, but the CopyMem() calls don't seem to cover the optional padding (from the PCD).
>
> I'm unsure if that matters, of course.
>
You're quite right. I'm not sure how I missed that.
In any case, I can add back the ZeroMem () quite easily after the
single invocation of AllocatePeiAccessiblePages() that I am adding in
this file.
> The patch looks good to me otherwise.
>
> Thanks
> Laszlo
>
>
>>
>> MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c | 45 ++------------------
>> 1 file changed, 4 insertions(+), 41 deletions(-)
>>
>> diff --git a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> index 71d624fc9ce9..b1f09710b65c 100644
>> --- a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> +++ b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> @@ -165,46 +165,6 @@ IsKnownID (
>> }
>> }
>>
>> -/**
>> - Allocate EfiReservedMemoryType below 4G memory address.
>> -
>> - This function allocates EfiReservedMemoryType below 4G memory address.
>> -
>> - @param[in] Size Size of memory to allocate.
>> -
>> - @return Allocated address for output.
>> -
>> -**/
>> -VOID *
>> -FpdtAllocateReservedMemoryBelow4G (
>> - IN UINTN Size
>> - )
>> -{
>> - UINTN Pages;
>> - EFI_PHYSICAL_ADDRESS Address;
>> - EFI_STATUS Status;
>> - VOID *Buffer;
>> -
>> - Buffer = NULL;
>> - Pages = EFI_SIZE_TO_PAGES (Size);
>> - Address = 0xffffffff;
>> -
>> - Status = gBS->AllocatePages (
>> - AllocateMaxAddress,
>> - EfiReservedMemoryType,
>> - Pages,
>> - &Address
>> - );
>> - ASSERT_EFI_ERROR (Status);
>> -
>> - if (!EFI_ERROR (Status)) {
>> - Buffer = (VOID *) (UINTN) Address;
>> - ZeroMem (Buffer, Size);
>> - }
>> -
>> - return Buffer;
>> -}
>> -
>> /**
>> Allocate buffer for Boot Performance table.
>>
>> @@ -348,7 +308,10 @@ AllocateBootPerformanceTable (
>> //
>> // Fail to allocate at specified address, continue to allocate at any address.
>> //
>> - mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) FpdtAllocateReservedMemoryBelow4G (BootPerformanceDataSize);
>> + mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) AllocatePeiAccessiblePages (
>> + EfiReservedMemoryType,
>> + EFI_SIZE_TO_PAGES (BootPerformanceDataSize)
>> + );
>> }
>> DEBUG ((DEBUG_INFO, "DxeCorePerformanceLib: ACPI Boot Performance Table address = 0x%x\n", mAcpiBootPerformanceTable));
>>
>>
>
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On 05/24/18 14:54, Ard Biesheuvel wrote:
> On 24 May 2018 at 14:49, Laszlo Ersek <lersek@redhat.com> wrote:
>> On 05/24/18 11:09, Ard Biesheuvel wrote:
>>> Replace the call to and implementation of the function
>>> FpdtAllocateReservedMemoryBelow4G() with a call to
>>> AllocatePeiAccessiblePages, which boils down to the same on X64,
>>> but does not crash non-X64 systems that lack memory below 4 GB.
>>>
>>> Contributed-under: TianoCore Contribution Agreement 1.1
>>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>>> ---
>>> Note that the ZeroMem() call is dropped, but it is redundant anyway, given
>>> that the subsequent CopyMem() call supersedes it immediately.
>>
>> I'm not sure the ZeroMem() is redundant. The allocation size -- before rounding up to full pages -- is computed like this:
>>
>> BootPerformanceDataSize = sizeof (BOOT_PERFORMANCE_TABLE) + mPerformanceLength + PcdGet32 (PcdExtFpdtBootRecordPadSize);
>> if (SmmCommData != NULL && SmmBootRecordData != NULL) {
>> BootPerformanceDataSize += SmmBootRecordDataSize;
>> }
>>
>> ZeroMem() covers all of the above, but the CopyMem() calls don't seem to cover the optional padding (from the PCD).
>>
>> I'm unsure if that matters, of course.
>>
>
> You're quite right. I'm not sure how I missed that.
>
> In any case, I can add back the ZeroMem () quite easily after the
> single invocation of AllocatePeiAccessiblePages() that I am adding in
> this file.
Thanks! With that:
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Laszlo
>
>> The patch looks good to me otherwise.
>>
>> Thanks
>> Laszlo
>>
>>
>>>
>>> MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c | 45 ++------------------
>>> 1 file changed, 4 insertions(+), 41 deletions(-)
>>>
>>> diff --git a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>>> index 71d624fc9ce9..b1f09710b65c 100644
>>> --- a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>>> +++ b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>>> @@ -165,46 +165,6 @@ IsKnownID (
>>> }
>>> }
>>>
>>> -/**
>>> - Allocate EfiReservedMemoryType below 4G memory address.
>>> -
>>> - This function allocates EfiReservedMemoryType below 4G memory address.
>>> -
>>> - @param[in] Size Size of memory to allocate.
>>> -
>>> - @return Allocated address for output.
>>> -
>>> -**/
>>> -VOID *
>>> -FpdtAllocateReservedMemoryBelow4G (
>>> - IN UINTN Size
>>> - )
>>> -{
>>> - UINTN Pages;
>>> - EFI_PHYSICAL_ADDRESS Address;
>>> - EFI_STATUS Status;
>>> - VOID *Buffer;
>>> -
>>> - Buffer = NULL;
>>> - Pages = EFI_SIZE_TO_PAGES (Size);
>>> - Address = 0xffffffff;
>>> -
>>> - Status = gBS->AllocatePages (
>>> - AllocateMaxAddress,
>>> - EfiReservedMemoryType,
>>> - Pages,
>>> - &Address
>>> - );
>>> - ASSERT_EFI_ERROR (Status);
>>> -
>>> - if (!EFI_ERROR (Status)) {
>>> - Buffer = (VOID *) (UINTN) Address;
>>> - ZeroMem (Buffer, Size);
>>> - }
>>> -
>>> - return Buffer;
>>> -}
>>> -
>>> /**
>>> Allocate buffer for Boot Performance table.
>>>
>>> @@ -348,7 +308,10 @@ AllocateBootPerformanceTable (
>>> //
>>> // Fail to allocate at specified address, continue to allocate at any address.
>>> //
>>> - mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) FpdtAllocateReservedMemoryBelow4G (BootPerformanceDataSize);
>>> + mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) AllocatePeiAccessiblePages (
>>> + EfiReservedMemoryType,
>>> + EFI_SIZE_TO_PAGES (BootPerformanceDataSize)
>>> + );
>>> }
>>> DEBUG ((DEBUG_INFO, "DxeCorePerformanceLib: ACPI Boot Performance Table address = 0x%x\n", mAcpiBootPerformanceTable));
>>>
>>>
>>
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Hi Ard,
Thank you very much for helping fix this issue.
And for ZeroMem(), it should be added back.
Because after the memory is allocated, the optional padding (from the PCD) memory will be used directly.
If ZeoMem() is dropped, then some contents in the padding memory will not be zero. Thus will impact the tool to parse the contents.
Thanks,
Dandan
-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ard Biesheuvel
Sent: Thursday, May 24, 2018 8:54 PM
To: Laszlo Ersek <lersek@redhat.com>
Cc: Dong, Eric <eric.dong@intel.com>; edk2-devel@lists.01.org; Gao, Liming <liming.gao@intel.com>; Bi, Dandan <dandan.bi@intel.com>; Leif Lindholm <leif.lindholm@linaro.org>; Kinney, Michael D <michael.d.kinney@intel.com>; Zeng, Star <star.zeng@intel.com>
Subject: Re: [edk2] [PATCH v2 4/5] MdeModulePkg/DxeCorePerformanceLib: use AllocatePeiAccessiblePages
On 24 May 2018 at 14:49, Laszlo Ersek <lersek@redhat.com> wrote:
> On 05/24/18 11:09, Ard Biesheuvel wrote:
>> Replace the call to and implementation of the function
>> FpdtAllocateReservedMemoryBelow4G() with a call to
>> AllocatePeiAccessiblePages, which boils down to the same on X64, but
>> does not crash non-X64 systems that lack memory below 4 GB.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.1
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>> Note that the ZeroMem() call is dropped, but it is redundant anyway,
>> given that the subsequent CopyMem() call supersedes it immediately.
>
> I'm not sure the ZeroMem() is redundant. The allocation size -- before rounding up to full pages -- is computed like this:
>
> BootPerformanceDataSize = sizeof (BOOT_PERFORMANCE_TABLE) + mPerformanceLength + PcdGet32 (PcdExtFpdtBootRecordPadSize);
> if (SmmCommData != NULL && SmmBootRecordData != NULL) {
> BootPerformanceDataSize += SmmBootRecordDataSize;
> }
>
> ZeroMem() covers all of the above, but the CopyMem() calls don't seem to cover the optional padding (from the PCD).
>
> I'm unsure if that matters, of course.
>
You're quite right. I'm not sure how I missed that.
In any case, I can add back the ZeroMem () quite easily after the single invocation of AllocatePeiAccessiblePages() that I am adding in this file.
> The patch looks good to me otherwise.
>
> Thanks
> Laszlo
>
>
>>
>> MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c |
>> 45 ++------------------
>> 1 file changed, 4 insertions(+), 41 deletions(-)
>>
>> diff --git
>> a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> index 71d624fc9ce9..b1f09710b65c 100644
>> ---
>> a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> +++ b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLi
>> +++ b.c
>> @@ -165,46 +165,6 @@ IsKnownID (
>> }
>> }
>>
>> -/**
>> - Allocate EfiReservedMemoryType below 4G memory address.
>> -
>> - This function allocates EfiReservedMemoryType below 4G memory address.
>> -
>> - @param[in] Size Size of memory to allocate.
>> -
>> - @return Allocated address for output.
>> -
>> -**/
>> -VOID *
>> -FpdtAllocateReservedMemoryBelow4G (
>> - IN UINTN Size
>> - )
>> -{
>> - UINTN Pages;
>> - EFI_PHYSICAL_ADDRESS Address;
>> - EFI_STATUS Status;
>> - VOID *Buffer;
>> -
>> - Buffer = NULL;
>> - Pages = EFI_SIZE_TO_PAGES (Size);
>> - Address = 0xffffffff;
>> -
>> - Status = gBS->AllocatePages (
>> - AllocateMaxAddress,
>> - EfiReservedMemoryType,
>> - Pages,
>> - &Address
>> - );
>> - ASSERT_EFI_ERROR (Status);
>> -
>> - if (!EFI_ERROR (Status)) {
>> - Buffer = (VOID *) (UINTN) Address;
>> - ZeroMem (Buffer, Size);
>> - }
>> -
>> - return Buffer;
>> -}
>> -
>> /**
>> Allocate buffer for Boot Performance table.
>>
>> @@ -348,7 +308,10 @@ AllocateBootPerformanceTable (
>> //
>> // Fail to allocate at specified address, continue to allocate at any address.
>> //
>> - mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) FpdtAllocateReservedMemoryBelow4G (BootPerformanceDataSize);
>> + mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) AllocatePeiAccessiblePages (
>> + EfiReservedMemoryType,
>> + EFI_SIZE_TO_PAGES (BootPerformanceDataSize)
>> + );
>> }
>> DEBUG ((DEBUG_INFO, "DxeCorePerformanceLib: ACPI Boot Performance
>> Table address = 0x%x\n", mAcpiBootPerformanceTable));
>>
>>
>
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mAcpiBootPerformanceTable->Header.Length could reflect the real table length, right?
When the padding (from the PCD) memory is used, mAcpiBootPerformanceTable->Header.Length will be updated accordingly.
If that is the case, it seems safe without ZeroMem.
Anyway it needs to be verified.
But, to be simple, I do not object to have ZeroMem to be equivalent with previous code.
Thanks,
Star
-----Original Message-----
From: Bi, Dandan
Sent: Friday, May 25, 2018 10:01 AM
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>; Laszlo Ersek <lersek@redhat.com>
Cc: Dong, Eric <eric.dong@intel.com>; edk2-devel@lists.01.org; Gao, Liming <liming.gao@intel.com>; Leif Lindholm <leif.lindholm@linaro.org>; Kinney, Michael D <michael.d.kinney@intel.com>; Zeng, Star <star.zeng@intel.com>
Subject: RE: [edk2] [PATCH v2 4/5] MdeModulePkg/DxeCorePerformanceLib: use AllocatePeiAccessiblePages
Hi Ard,
Thank you very much for helping fix this issue.
And for ZeroMem(), it should be added back.
Because after the memory is allocated, the optional padding (from the PCD) memory will be used directly.
If ZeoMem() is dropped, then some contents in the padding memory will not be zero. Thus will impact the tool to parse the contents.
Thanks,
Dandan
-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ard Biesheuvel
Sent: Thursday, May 24, 2018 8:54 PM
To: Laszlo Ersek <lersek@redhat.com>
Cc: Dong, Eric <eric.dong@intel.com>; edk2-devel@lists.01.org; Gao, Liming <liming.gao@intel.com>; Bi, Dandan <dandan.bi@intel.com>; Leif Lindholm <leif.lindholm@linaro.org>; Kinney, Michael D <michael.d.kinney@intel.com>; Zeng, Star <star.zeng@intel.com>
Subject: Re: [edk2] [PATCH v2 4/5] MdeModulePkg/DxeCorePerformanceLib: use AllocatePeiAccessiblePages
On 24 May 2018 at 14:49, Laszlo Ersek <lersek@redhat.com> wrote:
> On 05/24/18 11:09, Ard Biesheuvel wrote:
>> Replace the call to and implementation of the function
>> FpdtAllocateReservedMemoryBelow4G() with a call to
>> AllocatePeiAccessiblePages, which boils down to the same on X64, but
>> does not crash non-X64 systems that lack memory below 4 GB.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.1
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>> Note that the ZeroMem() call is dropped, but it is redundant anyway,
>> given that the subsequent CopyMem() call supersedes it immediately.
>
> I'm not sure the ZeroMem() is redundant. The allocation size -- before rounding up to full pages -- is computed like this:
>
> BootPerformanceDataSize = sizeof (BOOT_PERFORMANCE_TABLE) + mPerformanceLength + PcdGet32 (PcdExtFpdtBootRecordPadSize);
> if (SmmCommData != NULL && SmmBootRecordData != NULL) {
> BootPerformanceDataSize += SmmBootRecordDataSize;
> }
>
> ZeroMem() covers all of the above, but the CopyMem() calls don't seem to cover the optional padding (from the PCD).
>
> I'm unsure if that matters, of course.
>
You're quite right. I'm not sure how I missed that.
In any case, I can add back the ZeroMem () quite easily after the single invocation of AllocatePeiAccessiblePages() that I am adding in this file.
> The patch looks good to me otherwise.
>
> Thanks
> Laszlo
>
>
>>
>> MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c |
>> 45 ++------------------
>> 1 file changed, 4 insertions(+), 41 deletions(-)
>>
>> diff --git
>> a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> index 71d624fc9ce9..b1f09710b65c 100644
>> ---
>> a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> +++ b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLi
>> +++ b.c
>> @@ -165,46 +165,6 @@ IsKnownID (
>> }
>> }
>>
>> -/**
>> - Allocate EfiReservedMemoryType below 4G memory address.
>> -
>> - This function allocates EfiReservedMemoryType below 4G memory address.
>> -
>> - @param[in] Size Size of memory to allocate.
>> -
>> - @return Allocated address for output.
>> -
>> -**/
>> -VOID *
>> -FpdtAllocateReservedMemoryBelow4G (
>> - IN UINTN Size
>> - )
>> -{
>> - UINTN Pages;
>> - EFI_PHYSICAL_ADDRESS Address;
>> - EFI_STATUS Status;
>> - VOID *Buffer;
>> -
>> - Buffer = NULL;
>> - Pages = EFI_SIZE_TO_PAGES (Size);
>> - Address = 0xffffffff;
>> -
>> - Status = gBS->AllocatePages (
>> - AllocateMaxAddress,
>> - EfiReservedMemoryType,
>> - Pages,
>> - &Address
>> - );
>> - ASSERT_EFI_ERROR (Status);
>> -
>> - if (!EFI_ERROR (Status)) {
>> - Buffer = (VOID *) (UINTN) Address;
>> - ZeroMem (Buffer, Size);
>> - }
>> -
>> - return Buffer;
>> -}
>> -
>> /**
>> Allocate buffer for Boot Performance table.
>>
>> @@ -348,7 +308,10 @@ AllocateBootPerformanceTable (
>> //
>> // Fail to allocate at specified address, continue to allocate at any address.
>> //
>> - mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) FpdtAllocateReservedMemoryBelow4G (BootPerformanceDataSize);
>> + mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) AllocatePeiAccessiblePages (
>> + EfiReservedMemoryType,
>> + EFI_SIZE_TO_PAGES (BootPerformanceDataSize)
>> + );
>> }
>> DEBUG ((DEBUG_INFO, "DxeCorePerformanceLib: ACPI Boot Performance
>> Table address = 0x%x\n", mAcpiBootPerformanceTable));
>>
>>
>
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Hi Star,
Yes. You are right. mAcpiBootPerformanceTable->Header.Length will be updated accordingly. We can get the real table length.
Currently there are some contents in the table are not updated, just use the value in the memory.
Previously the memory value is zero. But without ZeroMem(), the value may be non-zero. That's the difference. It may impact the code to parse the table.
Thanks,
Dandan
-----Original Message-----
From: Zeng, Star
Sent: Friday, May 25, 2018 10:45 AM
To: Bi, Dandan <dandan.bi@intel.com>; Ard Biesheuvel <ard.biesheuvel@linaro.org>; Laszlo Ersek <lersek@redhat.com>
Cc: Dong, Eric <eric.dong@intel.com>; edk2-devel@lists.01.org; Gao, Liming <liming.gao@intel.com>; Leif Lindholm <leif.lindholm@linaro.org>; Kinney, Michael D <michael.d.kinney@intel.com>; Zeng, Star <star.zeng@intel.com>
Subject: RE: [edk2] [PATCH v2 4/5] MdeModulePkg/DxeCorePerformanceLib: use AllocatePeiAccessiblePages
mAcpiBootPerformanceTable->Header.Length could reflect the real table length, right?
When the padding (from the PCD) memory is used, mAcpiBootPerformanceTable->Header.Length will be updated accordingly.
If that is the case, it seems safe without ZeroMem.
Anyway it needs to be verified.
But, to be simple, I do not object to have ZeroMem to be equivalent with previous code.
Thanks,
Star
-----Original Message-----
From: Bi, Dandan
Sent: Friday, May 25, 2018 10:01 AM
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>; Laszlo Ersek <lersek@redhat.com>
Cc: Dong, Eric <eric.dong@intel.com>; edk2-devel@lists.01.org; Gao, Liming <liming.gao@intel.com>; Leif Lindholm <leif.lindholm@linaro.org>; Kinney, Michael D <michael.d.kinney@intel.com>; Zeng, Star <star.zeng@intel.com>
Subject: RE: [edk2] [PATCH v2 4/5] MdeModulePkg/DxeCorePerformanceLib: use AllocatePeiAccessiblePages
Hi Ard,
Thank you very much for helping fix this issue.
And for ZeroMem(), it should be added back.
Because after the memory is allocated, the optional padding (from the PCD) memory will be used directly.
If ZeoMem() is dropped, then some contents in the padding memory will not be zero. Thus will impact the tool to parse the contents.
Thanks,
Dandan
-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ard Biesheuvel
Sent: Thursday, May 24, 2018 8:54 PM
To: Laszlo Ersek <lersek@redhat.com>
Cc: Dong, Eric <eric.dong@intel.com>; edk2-devel@lists.01.org; Gao, Liming <liming.gao@intel.com>; Bi, Dandan <dandan.bi@intel.com>; Leif Lindholm <leif.lindholm@linaro.org>; Kinney, Michael D <michael.d.kinney@intel.com>; Zeng, Star <star.zeng@intel.com>
Subject: Re: [edk2] [PATCH v2 4/5] MdeModulePkg/DxeCorePerformanceLib: use AllocatePeiAccessiblePages
On 24 May 2018 at 14:49, Laszlo Ersek <lersek@redhat.com> wrote:
> On 05/24/18 11:09, Ard Biesheuvel wrote:
>> Replace the call to and implementation of the function
>> FpdtAllocateReservedMemoryBelow4G() with a call to
>> AllocatePeiAccessiblePages, which boils down to the same on X64, but
>> does not crash non-X64 systems that lack memory below 4 GB.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.1
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>> Note that the ZeroMem() call is dropped, but it is redundant anyway,
>> given that the subsequent CopyMem() call supersedes it immediately.
>
> I'm not sure the ZeroMem() is redundant. The allocation size -- before rounding up to full pages -- is computed like this:
>
> BootPerformanceDataSize = sizeof (BOOT_PERFORMANCE_TABLE) + mPerformanceLength + PcdGet32 (PcdExtFpdtBootRecordPadSize);
> if (SmmCommData != NULL && SmmBootRecordData != NULL) {
> BootPerformanceDataSize += SmmBootRecordDataSize;
> }
>
> ZeroMem() covers all of the above, but the CopyMem() calls don't seem to cover the optional padding (from the PCD).
>
> I'm unsure if that matters, of course.
>
You're quite right. I'm not sure how I missed that.
In any case, I can add back the ZeroMem () quite easily after the single invocation of AllocatePeiAccessiblePages() that I am adding in this file.
> The patch looks good to me otherwise.
>
> Thanks
> Laszlo
>
>
>>
>> MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c |
>> 45 ++------------------
>> 1 file changed, 4 insertions(+), 41 deletions(-)
>>
>> diff --git
>> a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> index 71d624fc9ce9..b1f09710b65c 100644
>> ---
>> a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
>> +++ b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLi
>> +++ b.c
>> @@ -165,46 +165,6 @@ IsKnownID (
>> }
>> }
>>
>> -/**
>> - Allocate EfiReservedMemoryType below 4G memory address.
>> -
>> - This function allocates EfiReservedMemoryType below 4G memory address.
>> -
>> - @param[in] Size Size of memory to allocate.
>> -
>> - @return Allocated address for output.
>> -
>> -**/
>> -VOID *
>> -FpdtAllocateReservedMemoryBelow4G (
>> - IN UINTN Size
>> - )
>> -{
>> - UINTN Pages;
>> - EFI_PHYSICAL_ADDRESS Address;
>> - EFI_STATUS Status;
>> - VOID *Buffer;
>> -
>> - Buffer = NULL;
>> - Pages = EFI_SIZE_TO_PAGES (Size);
>> - Address = 0xffffffff;
>> -
>> - Status = gBS->AllocatePages (
>> - AllocateMaxAddress,
>> - EfiReservedMemoryType,
>> - Pages,
>> - &Address
>> - );
>> - ASSERT_EFI_ERROR (Status);
>> -
>> - if (!EFI_ERROR (Status)) {
>> - Buffer = (VOID *) (UINTN) Address;
>> - ZeroMem (Buffer, Size);
>> - }
>> -
>> - return Buffer;
>> -}
>> -
>> /**
>> Allocate buffer for Boot Performance table.
>>
>> @@ -348,7 +308,10 @@ AllocateBootPerformanceTable (
>> //
>> // Fail to allocate at specified address, continue to allocate at any address.
>> //
>> - mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) FpdtAllocateReservedMemoryBelow4G (BootPerformanceDataSize);
>> + mAcpiBootPerformanceTable = (BOOT_PERFORMANCE_TABLE *) AllocatePeiAccessiblePages (
>> + EfiReservedMemoryType,
>> + EFI_SIZE_TO_PAGES (BootPerformanceDataSize)
>> + );
>> }
>> DEBUG ((DEBUG_INFO, "DxeCorePerformanceLib: ACPI Boot Performance
>> Table address = 0x%x\n", mAcpiBootPerformanceTable));
>>
>>
>
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