Hi,

...

@Arun, your view on how those two items were solved is beneficial to further elaborate our plans.

@Arunachalam Ganapathy your comments on this topic would be very helpful.

Thanks.

-----Original Message----- From: Hafnium hafnium-bounces@lists.trustedfirmware.org On Behalf Of Varun Wadekar via Hafnium Sent: Monday, May 31, 2021 1:49 PM To: Olivier Deprez Olivier.Deprez@arm.com; hafnium@lists.trustedfirmware.org; Arunachalam Ganapathy Arunachalam.Ganapathy@arm.com Cc: Bo Yan byan@nvidia.com Subject: Re: [Hafnium] .git submodules increase hafnium code size

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Hi Olivier,

Thanks for answering my queries.

We are looking to deploy the following use case at NVIDIA.

<snip>

-ability to build only the SPMC (not all reference targets such as qemu, rpi4, fvp) -A distribution only requiring the Hypervisor/SPMC output binary ("out/reference/.../hafnium.bin") using any toolchain (be it arm64 or x86 host, and arbitrary clang version).

<snip>

...

As you noticed, the Hafnium Hypervisor/SPMC and test environment builds are closely coupled by the use of ninja/gn flow and scripts. We intend to approach those problems in the course of Q3 in Arm OSS roadmap.

[VW] Are there any local changes to decouple hafnium from its dependencies? We can evaluate Arm;s approach against what we use internally. Our changes moved the dependencies out of the tree and passed file locations to the build system with the help of command line arguments.

-Varun

-----Original Message----- From: Olivier Deprez Olivier.Deprez@arm.com Sent: Monday, May 31, 2021 11:03 AM To: hafnium@lists.trustedfirmware.org; Varun Wadekar vwadekar@nvidia.com; Arunachalam Ganapathy Arunachalam.Ganapathy@arm.com Cc: Bo Yan byan@nvidia.com Subject: Re: .git submodules increase hafnium code size

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Hi Varun,

We had similar requests raised internally. 1- First in context of Total Compute delivery from Arm OSS platforms: a. ability to build only the SPMC on TC0 platform (not all reference targets such as qemu, rpi4, fvp) b. use a Yocto provided toolchain. @Arun, your view on how those two items were solved is beneficial to further elaborate our plans. 2- A similar request as 1.b to build Hafnium as part of a distribution on arm64 host: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdeveloper....

In my view there are two consumers: -A distribution only requiring the Hypervisor/SPMC output binary ("out/reference/.../hafnium.bin") using any toolchain (be it arm64 or x86 host, and arbitrary clang version). -The Hf CI framework/automation needs the above, plus the test framework and tests (dependency on googletest, linux submodules etc). It's important to keep this item alive while trying to solve above item.

As you noticed, the Hafnium Hypervisor/SPMC and test environment builds are closely coupled by the use of ninja/gn flow and scripts. They are using a fixed toolchain version through prebuilts to ensure builds are "reproducible", in particular with regards to the Hafnium CI.

We intend to approach those problems in the course of Q3 in Arm OSS roadmap. As an early exploration we already have: -clang 12 compiler upgrade. This is necessary if wiling to use any arbitrary clang version: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Freview.tru...) -Ability to build on arm64 host (done, internally). -Identify the flow/script changes such that external dependencies can be used (on-going, internally). I thought of localizing common dependencies to python/shell scripts by the use of definition files included in the mentioned scripts. This is only an early investigation, I will check how this intersects the changes you provided.

Regards, Olivier.

From: Hafnium hafnium-bounces@lists.trustedfirmware.org on behalf of Varun Wadekar via Hafnium hafnium@lists.trustedfirmware.org Sent: 28 May 2021 16:47 To: hafnium@lists.trustedfirmware.org hafnium@lists.trustedfirmware.org Cc: Bo Yan byan@nvidia.com Subject: [Hafnium] .git submodules increase hafnium code size

Hi,

We at NVIDIA are evaluating Hafnium. During the initial investigation, we found out that the repository size (in terms of MB) is huge. This is mostly because of the "git submodules" used by the project. This is a great way to deliver Hafnium with its dependencies in one go.

But we think that the size can be trimmed by moving the toolchain, linux folder, googletest and dtc compiler out, leaving just the Hafnium code in the project. This way, companies like us can pick and choose instead of having to use everything. In a bid to ease the pain internally and only use the Hafnium code base we have crafted the following changes:

1. hafnium: support external projects (I10a07de3) * Gerrit Code Review (trustedfirmware.org)https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Freview.trustedfirmware.org%2Fc%2Fhafnium%2Fhafnium%2F%2B%2F10142&data=04%7C01%7Cvwadekar%40nvidia.com%7C38835bbec3664554215408d924327fa2%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C637580622340020852%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=J9%2BI0HlStEJsNeko1sGFTpZPYwK6h9Dchh6ww%2FFUgNM%3D&reserved=0 2. hafnium: build with dtc and googletest out of tree (I057c9ad6) * Gerrit Code Review (trustedfirmware.org)https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Freview.trustedfirmware.org%2Fc%2Fhafnium%2Fhafnium%2F%2B%2F10144&data=04%7C01%7Cvwadekar%40nvidia.com%7C38835bbec3664554215408d924327fa2%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C637580622340020852%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=tz6T6pPLzbXZFXjCvR2CZUpJGxz0NP20kAj4KbhMzZ0%3D&reserved=0 3. build: support external toolchain (Iafd029c1) * Gerrit Code Review (trustedfirmware.org)https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Freview.trustedfirmware.org%2Fc%2Fhafnium%2Fhafnium%2F%2B%2F10145&data=04%7C01%7Cvwadekar%40nvidia.com%7C38835bbec3664554215408d924327fa2%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C637580622340020852%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=1LEfN0YikPjaPUXDSUfuf%2BskaO%2FhkNjZcSoQdVTfJF4%3D&reserved=0

This series does not have the patch to use an out of tree linux codebase. I assume these patches wont be acceptable in their current state, so would like to know how the community plans to handle this situation.

The code size is a real concern for us, as we already have copies of the dependencies in our codebase, so have no use for these duplicates.

Thanks. -- Hafnium mailing list Hafnium@lists.trustedfirmware.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.trus... -- Hafnium mailing list Hafnium@lists.trustedfirmware.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.trus...