linux-kernel - Re: [PATCH v3 2/2] gpu: nova-core: add boot42 support for next-gen GPUs

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Message-ID: <b8796ee0-05fc-48e1-a075-2bad99b938d2@nvidia.com>
Date: Wed, 29 Oct 2025 18:07:27 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Timur Tabi <ttabi@...dia.com>, "dakr@...nel.org" <dakr@...nel.org>
Cc: "lossin@...nel.org" <lossin@...nel.org>,
 "a.hindborg@...nel.org" <a.hindborg@...nel.org>,
 "boqun.feng@...il.com" <boqun.feng@...il.com>, Zhi Wang <zhiw@...dia.com>,
 "simona@...ll.ch" <simona@...ll.ch>, "tmgross@...ch.edu"
 <tmgross@...ch.edu>, "alex.gaynor@...il.com" <alex.gaynor@...il.com>,
 "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
 "ojeda@...nel.org" <ojeda@...nel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
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 Edwin Peer <epeer@...dia.com>, "airlied@...il.com" <airlied@...il.com>,
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 Joel Fernandes <joelagnelf@...dia.com>,
 Alexandre Courbot <acourbot@...dia.com>, "gary@...yguo.net"
 <gary@...yguo.net>, Alistair Popple <apopple@...dia.com>
Subject: Re: [PATCH v3 2/2] gpu: nova-core: add boot42 support for next-gen
 GPUs

On 10/29/25 6:01 PM, Timur Tabi wrote:
> On Wed, 2025-10-29 at 17:35 -0700, John Hubbard wrote:
>>          // "Future" GPUs (some time after Rubin) will set `architecture_0`
>>          // to 0, and `architecture_1` to 1, and put the architecture details in
>>          // boot42 instead.
> 
> I don't want to kick a dead horse here, but aren't the architecture details already in boot42
> for Turing?  I thought the whole point was that we don't need boot0 any more, and only Nouveau
> has to worry about boot0 vs boot42.

Yes, but someone can still plug in a pre-Turing GPU and try to
boot up with nova-core.ko on the system.

So it's important to avoid getting into trouble in that case.

thanks,
John Hubbard