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Thu, 13 Aug 2026 12:09:53 -0700 (PDT) Received: from [10.138.10.6] ([185.98.168.14]) by smtp.gmail.com with ESMTPSA id 00721157ae682-836c1777930sm3475807b3.31.2026.08.13.12.09.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Aug 2026 12:09:52 -0700 (PDT) Message-ID: <0d2706c6-79fa-40fc-a24a-6d5ffbf02330@gmail.com> Date: Thu, 13 Aug 2026 15:09:36 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] crypto: qce - Replace with stub driver To: Bartosz Golaszewski Cc: linux-crypto@vger.kernel.org, Herbert Xu , linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Kuldeep Singh , Dmitry Baryshkov , Konrad Dybcio , Greg Kroah-Hartman , Krzysztof Kozlowski , Eric Biggers References: <20260731050838.158825-1-ebiggers@kernel.org> <3ba57269-3305-4d80-b3f2-aa82fa59b59d@gmail.com> <20260801162900.GA2021@quark> <20260801171242.GA3567@quark> <20260811224110.GC1905@sol> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------i894QC0fu9NisDOBnbo7myGW" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260813_120956_001142_F612F79B X-CRM114-Status: GOOD ( 23.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------i894QC0fu9NisDOBnbo7myGW Content-Type: multipart/mixed; boundary="------------iw28fzqMn9Gj0JhxTrO2tL3G"; protected-headers="v1"; hp="clear" Message-ID: <0d2706c6-79fa-40fc-a24a-6d5ffbf02330@gmail.com> Date: Thu, 13 Aug 2026 15:09:36 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] crypto: qce - Replace with stub driver To: Bartosz Golaszewski Cc: linux-crypto@vger.kernel.org, Herbert Xu , linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Kuldeep Singh , Dmitry Baryshkov , Konrad Dybcio , Greg Kroah-Hartman , Krzysztof Kozlowski , Eric Biggers References: <20260731050838.158825-1-ebiggers@kernel.org> <3ba57269-3305-4d80-b3f2-aa82fa59b59d@gmail.com> <20260801162900.GA2021@quark> <20260801171242.GA3567@quark> <20260811224110.GC1905@sol> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 8/13/26 07:53, Bartosz Golaszewski wrote: > On Wed, 12 Aug 2026 18:33:45 +0200, Demi Marie Obenour > said: >> On 8/12/26 04:07, Bartosz Golaszewski wrote: >>> On Wed, 12 Aug 2026 00:41:10 +0200, Eric Biggers said: >>>> On Tue, Aug 11, 2026 at 08:42:55AM -0500, Bartosz Golaszewski wrote:= >>>> >>>>> No, the rationale has never been this. FWIW it can be that it's use= d for >>>>> testing of the crypto module on a supported platform and that is al= ready >>>>> enough of a reason to keep it upstream. >>>>> >>>>> As I've said before: we don't just drop maintained drivers from lin= ux. >>>> >>>> We definitely do if the drivers are not useful or appropriate for >>>> inclusion in the kernel, though the policy varies by subsystem. Eve= n >>>> just last month an entire filesystem got dropped despite someone wan= ting >>>> to maintain it. >>>> >>> >>> I suppose you're talking about EFS? A thing that can't even be tested= on real >>> hardware? This is a much more extreme case. Here you have several peo= ple >>> representing the vendor saying they want to keep and maintain it. I'm= fine >>> having my own tree and sending PRs to Herbert if he agrees and you ar= e of >>> course entirely free to disregard any patches targetting it. >> >> Would you be okay with one of these options? >> >> 1. Make the stub driver as the default, with >> the real driver guarded by an off-by-default Kconfig option. >> >> 2. Keep the driver as is (with the power management issue fixed), >> but don't register any algorithm implementations with the crypto AP= I. >> >> 3. Only register algorithm implementations with the crypto API if a >> non-default Kconfig option is selected. >> >> 4. Only register algorithm implementations with the crypto API if a >> non-default module parameter is selected. >> >> 5. Move the driver out of drivers/crypto, delete the algorithm >> registrations, and then add support for restricted media content >> decryption later. >> >> The last option would be my preferred one. >> >=20 > I actually have a slightly different spin on the stub driver. I'd like = to > keep the driver future-proof and avoid all kinds of needless churn when= we > do get to the secure dma bufs and restricted media playback (and we wil= l get > there eventually :) ). >=20 > Can we make the QCE into an MFD driver with the core binding to the DT = node > and handling the interconnect bandwidth, while the part handling crypto= > algorithms becomes its cell and is moved into a separate module? This o= ne can > be disabled in defconfig by default and I don't even mind it being guar= ded with > CONFIG_EXPERT. The core module would remain in arm64 defconfig. >=20 > With that: any future extensions providing support for more functionali= ties of > this IP can simply be implemented as more MFD cells while we can also k= eep > chipping away at the existing code and use it for testing the BAM pipe = locking. I'm not familiar with MFD drivers, but this sounds like the best of both worlds. The driver stays upstream, but anyone who doesn't explicitly need it can ignore it. >> Also, if Qualcomm has customers who use the QCE via the crypto API, >> is Qualcomm aware of _why_ they made that choice? From Eric's and >> my perspective, that seems like a very strange decision, unless there >> are factors that Eric and I are not aware of. >> >=20 > SM8650 with the QCE is FIPS 140-2 certified and apparently this makes > a difference. Don't ask me if that makes sense, I don't claim to unders= tand > the legal aspects of it. That sounds like the kind of thing that would cause someone to use a worse implementation of cryptographic algorithms =F0=9F=99=82. For what it is worth, many common uses of kernel cryptography can't use the QCE. This notably applies to the CSPRNG (/dev/urandom etc), storage encryption, and AF_ALG. Therefore, I expect that anyone who needs FIPS 140 compliance with Linux needs to ensure that the software crypto is certified, as that's what actually gets used in most cases. >> Finally, would you be willing to have a group call to discuss this >> at some point? That might be a more suitable venue for this kind of >> discussion, and could potentially lead to a conclusion faster. Also, >> while at least I couldn't sign any NDAs, there might be information th= at >> you could discuss there that you cannot post to a public mailing list.= >=20 > Sure, I'm fine to have a call. If you think about coming to Linux Plumb= ers this > year, I'll be there all week and it's a good place for such a discussio= n too. >=20 > FYI I've only been online for a couple days this week and I'm going off= line > again until the end of August with the exception of August 26th when I'= ll be > able to chime in again. Any call would too have to happen in September = at the > earliest. That's fine. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------iw28fzqMn9Gj0JhxTrO2tL3G-- --------------i894QC0fu9NisDOBnbo7myGW Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmp+FnsACgkQszaHOrMp 8lMIfw/+Kqprcz6oo8QmpcPVroEZnU8mBZm1kTqPFF+gxGc26IAQJGGXHb/yrvfx VIidixfHFA26THV6qcQsgygKHEKsJsgboUximTQZoMs3jW2PACfU43CJf+puDbsp WeBpYme2gDmPuWONQStHDyUPX8IoIM4H3uu8I8swnmqcFbug6UJ9GHQ2aPbkxMcO 5SX9AxB9pSoMwPXrdEH5jhGNKxKzmZ6wLoA76JMBzny+/8QvYQPSuAFM/b2FXJO+ KayMYCXYIodfolW7+jt9kEv5cf33qLDzfvLMiJRjnAG8/amEMTnAHjgCh3w3DqlO 2Mh+RY6W495XGMU4zTHbZxUENPhd0FB4hs7ZeelA2sHtMjr6/Rc1uEbWFmLSJAmH DtX9atgq4cU311LpqAEVxCeGQl9K/Xstvk44ke9p4xDjLM8PVmkt/dBHW5YoCScF lCKkyVfVlE+BIIPu6LYs6HMzl10QxI1bDDol5EjUYJDwu5b0phMgrKykxAbz6/Qf lQJBbNb6fHX8WAPm9zZN0+GyXARuQrv3zZn3tU8R0S9w5/GvMF/kT1SX999coXmQ V/yjzkxwJEaiXq7xb7ulNcR0l+61LMq8daThzyyDLcc0hqMyLTAbYygRiHxNs6Hl xdnpw7Zn8UPo4BZ+UkLlVG74V0U4gYzsGLlNcD23vAsfnaI3RTQ= =Of7Y -----END PGP SIGNATURE----- --------------i894QC0fu9NisDOBnbo7myGW--