linux-kernel - Re: [PATCH 23/31] gpu: nova-core: Hopper/Blackwell: add FSP Chain of Trust boot

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Message-ID: <d9ca3708-8192-4897-9608-33232be14c20@nvidia.com>
Date: Sun, 7 Dec 2025 22:09:20 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Joel Fernandes <joelagnelf@...dia.com>
Cc: Danilo Krummrich <dakr@...nel.org>,
 Alexandre Courbot <acourbot@...dia.com>, Timur Tabi <ttabi@...dia.com>,
 Alistair Popple <apopple@...dia.com>, Edwin Peer <epeer@...dia.com>,
 Zhi Wang <zhiw@...dia.com>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Bjorn Helgaas <bhelgaas@...gle.com>,
 Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>,
 Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
 nouveau@...ts.freedesktop.org, rust-for-linux@...r.kernel.org,
 LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 23/31] gpu: nova-core: Hopper/Blackwell: add FSP Chain of
 Trust boot

On 12/6/25 1:36 PM, Joel Fernandes wrote:
> On Tue, Dec 02, 2025 at 09:59:15PM -0800, John Hubbard wrote:
...
>> +/// FSP Chain of Trust (COT) version for Blackwell.
>> +/// GB202 uses version 2 (not 1 like GH100)
>> +const FSP_COT_VERSION: u16 = 2;
> 
> the comment says that Hopper needs this to be version 1 so how does this
> series boot on Hopper? maybe we need to add a new function to return a
> different version number for Hopper versus Blackwell?

That's correct. And the signature size is also different between
them, I'll fix that up too.

I'll work on getting the Hopper testing done, to shake out any
other issues.

> 
> edit: I just noticed in the cover letter that you mentioned this is tested
> only on Blackwell. I think perhaps we should drop the claim that the series
> works on hopper in the patches / cover letter.
> 
Yes, the cover letter mentions not tested on Hopper, because it
hasn't been. I don't recall any hard claims that it works on Hopper,
only that "support" has been added (code complete, not tested).

But hopefully I'll get a Hopper test run finished soon, to fortify
the v2 posting of this series.

thanks,
-- 
John Hubbard