[edk2-devel] PcdNoACPIReclaimMemory Usage

[edk2-devel] PcdNoACPIReclaimMemory Usage

[Oliver Smith-Denny via groups.io]

Hi Aaron,

I am reviewing 
https://github.com/tianocore/edk2/commit/932db9df0caa26daca4edf133fb2aed7b4a9193e
and I am looking for more information on the usage
of this PCD because the code and the commit message
don't provide much detail. I found the associated mailing list
thread: https://edk2.groups.io/g/devel/topic/105191315#msg117191,
but that also doesn't contain any information on the usage, just
that a feature requires it.

Can you please provide some additional information on what feature
requires all ACPI tables to be published in EfiAcpiMemoryNVS? When
would you expect a platform to set this PCD? Is it to boot a
specific OS or for a specific Intel feature?

Thanks,
Oliver


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Re: [edk2-devel] PcdNoACPIReclaimMemory Usage

[Aaron Li via groups.io]

Hi Oliver,

There is a case in a specific intel feature that requires to preserve the ACPI tables in memory
without being reclaimed by OS. That is why we need all ACPI tables to be published in 
EfiAcpiMemoryNVS.

Best,
Aaron

-----Original Message-----
From: Oliver Smith-Denny <osde@linux.microsoft.com> 
Sent: Tuesday, July 1, 2025 11:44 PM
To: Li, Aaron <aaron.li@intel.com>
Cc: devel@edk2.groups.io
Subject: PcdNoACPIReclaimMemory Usage

Hi Aaron,

I am reviewing 
https://github.com/tianocore/edk2/commit/932db9df0caa26daca4edf133fb2aed7b4a9193e
and I am looking for more information on the usage
of this PCD because the code and the commit message
don't provide much detail. I found the associated mailing list
thread: https://edk2.groups.io/g/devel/topic/105191315#msg117191,
but that also doesn't contain any information on the usage, just
that a feature requires it.

Can you please provide some additional information on what feature
requires all ACPI tables to be published in EfiAcpiMemoryNVS? When
would you expect a platform to set this PCD? Is it to boot a
specific OS or for a specific Intel feature?

Thanks,
Oliver


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Re: [edk2-devel] PcdNoACPIReclaimMemory Usage

[Oliver Smith-Denny via groups.io]

Are you able to share any more details? Say what the feature is and why
the tables must be in EfiAcpiMemoryNVS? Is this DRTM related?

We are trying to understand OS implications as well as for other
platforms. If the feature is not publicly released, I understand,
but certainly would appreciate if there are any more details that are
allowed to be shared publicly.

Thanks,
Oliver

On 7/2/2025 1:51 AM, Aaron Li via groups.io wrote:
> Hi Oliver,
> 
> There is a case in a specific intel feature that requires to preserve the ACPI tables in memory
> without being reclaimed by OS. That is why we need all ACPI tables to be published in
> EfiAcpiMemoryNVS.
> 
> Best,
> Aaron
> 
> -----Original Message-----
> From: Oliver Smith-Denny <osde@linux.microsoft.com>
> Sent: Tuesday, July 1, 2025 11:44 PM
> To: Li, Aaron <aaron.li@intel.com>
> Cc: devel@edk2.groups.io
> Subject: PcdNoACPIReclaimMemory Usage
> 
> Hi Aaron,
> 
> I am reviewing
> https://github.com/tianocore/edk2/commit/932db9df0caa26daca4edf133fb2aed7b4a9193e
> and I am looking for more information on the usage
> of this PCD because the code and the commit message
> don't provide much detail. I found the associated mailing list
> thread: https://edk2.groups.io/g/devel/topic/105191315#msg117191,
> but that also doesn't contain any information on the usage, just
> that a feature requires it.
> 
> Can you please provide some additional information on what feature
> requires all ACPI tables to be published in EfiAcpiMemoryNVS? When
> would you expect a platform to set this PCD? Is it to boot a
> specific OS or for a specific Intel feature?
> 
> Thanks,
> Oliver
> 
> 
> 
> 
> 



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Re: [edk2-devel] PcdNoACPIReclaimMemory Usage

[Aaron Li via groups.io]

Hi Oliver

Sorry I cannot share more details, the feature is not publicly released,
I can confirm the feature was not DRTM related.

Best,
Aaron

-----Original Message-----
From: Oliver Smith-Denny <osde@linux.microsoft.com> 
Sent: Wednesday, July 2, 2025 11:55 PM
To: devel@edk2.groups.io; Li, Aaron <aaron.li@intel.com>
Subject: Re: [edk2-devel] PcdNoACPIReclaimMemory Usage

Are you able to share any more details? Say what the feature is and why
the tables must be in EfiAcpiMemoryNVS? Is this DRTM related?

We are trying to understand OS implications as well as for other
platforms. If the feature is not publicly released, I understand,
but certainly would appreciate if there are any more details that are
allowed to be shared publicly.

Thanks,
Oliver

On 7/2/2025 1:51 AM, Aaron Li via groups.io wrote:
> Hi Oliver,
> 
> There is a case in a specific intel feature that requires to preserve the ACPI tables in memory
> without being reclaimed by OS. That is why we need all ACPI tables to be published in
> EfiAcpiMemoryNVS.
> 
> Best,
> Aaron
> 
> -----Original Message-----
> From: Oliver Smith-Denny <osde@linux.microsoft.com>
> Sent: Tuesday, July 1, 2025 11:44 PM
> To: Li, Aaron <aaron.li@intel.com>
> Cc: devel@edk2.groups.io
> Subject: PcdNoACPIReclaimMemory Usage
> 
> Hi Aaron,
> 
> I am reviewing
> https://github.com/tianocore/edk2/commit/932db9df0caa26daca4edf133fb2aed7b4a9193e
> and I am looking for more information on the usage
> of this PCD because the code and the commit message
> don't provide much detail. I found the associated mailing list
> thread: https://edk2.groups.io/g/devel/topic/105191315#msg117191,
> but that also doesn't contain any information on the usage, just
> that a feature requires it.
> 
> Can you please provide some additional information on what feature
> requires all ACPI tables to be published in EfiAcpiMemoryNVS? When
> would you expect a platform to set this PCD? Is it to boot a
> specific OS or for a specific Intel feature?
> 
> Thanks,
> Oliver
> 
> 
> 
> 
> 



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