From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mecka.net (mecka.net [159.69.159.214]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 298D0176AD4; Thu, 30 May 2024 07:35:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.159.214 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717054547; cv=none; b=CafBAFKmCTMaRTLAYthw/SjvnMCMqnsWkNTvpj/tqLhjBROUh8/7lECXGWbakywWCdexAhNalEyugKAuUCUz5easEJQNprwY/KJ6eqqtVXpej0HR4PrWA01UTJo6PTsJ6nUemBoLZeyauDRWSU91upQ7yzuf+jZG7RCRUPlGuQo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717054547; c=relaxed/simple; bh=qmrd9r2vsNDHYtSP6NNXhKeIjxw8FMvpIGgiZjUpdlg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=pwL6zN5NJxkxZIrTbjXacuqLOf9PDPD6JQRWl+e95erN+/R/xTpMP/opakEQ5tRnsT8aCWzVpPxusmMP+lX11PHPFcostz6pWNOfd7kX0HUzl92dpRsuSadAygmo1+4q9WgYuAGxzCONlukS8WmUV2R6InznPl36hx+IUTACWUo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=mecka.net; spf=pass smtp.mailfrom=mecka.net; dkim=fail (0-bit key) header.d=mecka.net header.i=@mecka.net header.b=HBmI0Pfo reason="key not found in DNS"; arc=none smtp.client-ip=159.69.159.214 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=mecka.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mecka.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=mecka.net header.i=@mecka.net header.b="HBmI0Pfo" DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mecka.net; s=2016.11; t=1717054542; bh=qmrd9r2vsNDHYtSP6NNXhKeIjxw8FMvpIGgiZjUpdlg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=HBmI0PfowWAQPbx6cZpE/gPD/kud5y6pBDadZiVuGqHMfEgJYOGBQkFyY2iQTjwFH 77p/pcKRkXnshTGTulOJBXBausGKWMpcmwepg268LykyDVifNCEE6ubFsIdKByLsPQ pKgxBxrPhFnR3zkDrQ5ddb7mVK2J6ePFdgvTJ1OmwFaLFlQW0w4PLd//yTjqhpGtmC 9sdhhkQRm4zbGOaSL59oh47i1UInHPKMJZE+ADIObEd2s70Mr1ZFWxg+wMoJRWYcZa oBhECABCrbBEBoZJnvqqb7l1xO5WKUweo/1pmw94Xv/0qMDuSE2BSLF6GEBvQSU0Zw qiTAS2y77VYyw== Received: from mecka.net (unknown [185.147.11.134]) by mecka.net (Postfix) with ESMTPSA id 2A51650BE4B; Thu, 30 May 2024 09:35:40 +0200 (CEST) Date: Thu, 30 May 2024 09:35:10 +0200 From: Manuel Traut To: Mikko Rapeli Cc: Sumit Garg , Jens Wiklander , Jerome Forissier , linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, op-tee@lists.trustedfirmware.org, Shyam Saini , Ulf Hansson , Linus Walleij , Ilias Apalodimas , Bart Van Assche , Randy Dunlap , Ard Biesheuvel , Arnd Bergmann , Greg Kroah-Hartman Subject: Re: [PATCH v7 4/4] optee: probe RPMB device using RPMB subsystem Message-ID: References: <20240527121340.3931987-1-jens.wiklander@linaro.org> <20240527121340.3931987-5-jens.wiklander@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Hi Mikko, On Wed, May 29, 2024 at 05:26:15PM +0300, Mikko Rapeli wrote: > Hi, > > On Wed, May 29, 2024 at 11:38:06AM +0200, Manuel Traut wrote: > > Hi Mikko, > > > > On 10:09 Wed 29 May , Mikko Rapeli wrote: > > > On Wed, May 29, 2024 at 10:56:04AM +0530, Sumit Garg wrote: > > > > On Tue, 28 May 2024 at 15:00, Mikko Rapeli wrote: > > > > > On Mon, May 27, 2024 at 03:24:01PM +0200, Jens Wiklander wrote: > > > > > > On Mon, May 27, 2024 at 3:00 PM Jerome Forissier > > > > > > wrote: > > > > > > > On 5/27/24 14:13, Jens Wiklander wrote: > > > > > Outside of these patches, I think the optee RPC setup with fTPM TA is one area which > > > > > currently requires tee-supplicant to be started. Detecting the existence of TPM before > > > > > kernel drivers are loaded is possible via the exported EFI logs from firmware to kernel > > > > > or ACPI TPM2 table entry, and detecting optee and thus starting tee-supplicant in userspace too. > > > > > > > > One thing I am trying to find an answer about is why do we need to > > > > defer tee-supplicant launch if it's bundled into initrd? Once you > > > > detect OP-TEE then tee-supplicant should be launched unconditionally. > > > > As per your example below, the motivation here seems to be the TPM2 > > > > device dependent on RPMB backend but what if other future systemd > > > > services come up and depend on other services offered by > > > > tee-supplicant? > > > > > > There is an annoying depedency between firmware side optee and TAs, and kernel optee driver, > > > tee-supplicant in userspace and kernel TA drivers like fTPM. > > > > > > Kernel fTPM driver and fTPM TA require tee-supplicant in userspace for RPMB, RPC etc. > > > > > > This patch series is adding kernel side support for RPMB handling so that the dependency to > > > tee-supplicant in userspace can be removed. For fTPM use case, there is still the optee RPC > > > buffer setup which currently requires tee-supplicant in userspace or fTPM TA will panic. > > > > > > So yes, currently, tee-supplicant must be started. But it would be great if kernel drivers > > > and firmware optee trusted applications would not depend on tee-supplicant running in userspace. > > > The startup sequence is really tricky to get right. My fTPM use case is using the TPM device > > > to encrypt rootfs and thus all SW components including tee-supplicant need to run early in > > > initramfs. Currently also switch from initramfs to main rootfs requires unloading > > > fTPM kernel driver and stopping tee-supplicant in initrd, and then starting tee-supplicant > > > and loading fTPM kernel driver from main rootfs. udev and automatic module loading for > > > fTPM can not be used due to the tee-supplicant userspace dependency. > > > > I decided to build fTPM as buildin-TA into OP-TEE. RPMB routing is already > > implemented in u-boot so it can already write PCR registers. > > Is build in TA same as early TA? I presume so. Indeed.. sorry for using the wrong term. > > With this series and the required changes in OP-TEE and a compiled in fTPM > > kernel driver and systemd v256 it is possible to use the fTPM in the initrd > > without tee-supplicant. > > > > Maybe this information is helpful to you, regards > > This is very interesting and I'm trying to get to the same state, though with > fTPM kernel driver as module. With v6 of this patch set and matching optee changes > I was not able to make this work as fTPM TA was crashing when loading ftpm kernel driver > due to failing RPC allocation, which tee-supplicant was setting up in the whole chain. > I'll try to get v7 patches working and test this again on my yocto based setup and kernel 6.6.y. I'll try today also with v7 and 6.10-rc1 on an i.MX8MM. It should also work with fTPM as kernel module if you use systemd in the initrd with the new tpm.target in systemd v256. Regards Manuel