Re: [PATCH v4 18/20] gpu: nova-core: add types for patching firmware binaries

[Danilo Krummrich <dakr@kernel.org>]

On 6/12/25 9:19 AM, Alexandre Courbot wrote:
> On Wed Jun 4, 2025 at 7:28 PM JST, Danilo Krummrich wrote:
>> If we can't patch them when the object is created, i.e. in
>> FirmwareDmaObject::new(), I think we should take self by value in
>> FirmwareDmaObject::patch_signature() and return a SignedFirmwareDmaObject (which
>> can just be a transparent wrapper) instead in order to let the type system prove
>> that we did not forget to call patch_signature().
> 
> This one is a bit tricky. Signature patching is actually optional,
> depending on whether there are signatures present at all (it might not
> be the case on development setups). So involving the type system here
> would require storing the result in an enum, and then match that enum
> later in order to do the same thing in both cases - load the binary
> as-is.
> 
> So I guess I would rather leave this one as it currently is, unless
> there is a better way I haven't thought about?

In the end the idea is to ensure that we can't forget to call patch_signature(), 
so even if it's optional we could do what I mentioned above, just that 
patch_signature() might be a noop?