Re: [PATCH v2] drivers/crypto: Mark QCE as BROKEN

[Eric Biggers <ebiggers@kernel.org>]

On Sun, Jul 12, 2026 at 05:31:31PM -0400, Demi Marie Obenour via B4 Relay wrote:
> From: Demi Marie Obenour <demiobenour@gmail.com>
> 
> This driver is harmful:
> 
> - It is much slower than the CPU [1] [2].
> - It Has a history of bugs [2] [3].
> - It does not have exclusive access to the hardware [4], causing races
>   with the secure world.
> - It register its implementations with too low a cra_priority for them
>   to be actually used [5].
> 
> Therefore, disable it to ensure that nobody builds it into kernels they
> intend to ship.
> 
> In the future, the driver will be used for processing restricted media
> content.  However, the kernel does not currently support this.  Since
> the driver will have future uses, allow building it if COMPILE_TEST is
> enabled.
> 
> [1]: https://lore.kernel.org/r/20250704070322.20692-1-ebiggers@kernel.org/
> [2]: https://lore.kernel.org/r/20250615031807.GA81869@sol/
> [3]: https://lore.kernel.org/r/20260706-qce-fix-self-tests-v5-0-86f461ff1829@oss.qualcomm.com/
> [4]: https://lore.kernel.org/r/20260629-qcom-qce-cmd-descr-v20-0-56f67da84c05@oss.qualcomm.com/
> [5]: https://lore.kernel.org/r/20260524204537.GB110177@quark/
> 
> Fixes: ec8f5d8f6f76 ("crypto: qce - Qualcomm crypto engine driver")
> Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>

Acked-by: Eric Biggers <ebiggers@kernel.org>

- Eric