From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DB6DCF9D0CA for ; Tue, 14 Apr 2026 13:35:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=MrpH3O/UC588LGlyijfHqwmmf8Fc2A9hjyYsMCvb23A=; b=zhIct983+UIFGr9yR5Kwg/+yCL 7XEOfRiDRJ9sRGlU4EqKvgCbv8DwXT2Jr4FxQbb8LLO6k+k7Y7gP0LuPtcxnCTVtUwmAO5GsdyU0W TkrNmtbGHVzipZlK3M1Og4p7qBqLnNbgLqgc/buMMe4+2JPFOpXJVfbiy7y7OEQBN/GS+kWgA9SW1 LcQtQQtAvcOV3SoWpSqMTXowfFZvQUB3OQrrcSocV86D6d3yBfD+MCt/SvuNLTPO8vw+Oo9Vk518e +oH0bMh1vIDJya+5yyBZ0junvpD2G+yWDxAcqeor/sFZOyTnzTbZaP4DEfHJtON9QRCEL6Z3jzDVN nLjt7Rcw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wCdvR-0000000HO1c-3oXu; Tue, 14 Apr 2026 13:35:33 +0000 Received: from mail-qv1-xf36.google.com ([2607:f8b0:4864:20::f36]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wCdvO-0000000HO1G-2JXH for linux-arm-kernel@lists.infradead.org; Tue, 14 Apr 2026 13:35:32 +0000 Received: by mail-qv1-xf36.google.com with SMTP id 6a1803df08f44-8a5800772f3so45545196d6.2 for ; Tue, 14 Apr 2026 06:35:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1776173729; x=1776778529; darn=lists.infradead.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=MrpH3O/UC588LGlyijfHqwmmf8Fc2A9hjyYsMCvb23A=; b=Bl+OZD7qynua4kAniGwuwRl2Oka1CrGeuvqSTt1BpcxhPE4RYaEpaSGKMOy0zkpmoV 7jafwVgAdGoaFnPUhfgNMz220e3wbZIzl3VpqczYYk6YYRAp1zF7HoM9dhx+PUKGgjng OjT8YisDXctzbhnTSLbtrnIBaXaHheR7eTzhj5Xputnr6tyss+l3LTqZNVzjdoqw8+xj EuNzOWhxJYEAMXML6DegtcuXAMPelqcQBOX3u2xO84fT4sRPf3fEMnoOzZnVdt38xdnl tg4BAhXIM2hzuRUKqun3T/Tj/yGTSLoeVf90NCdYjRHcdlTDuW/OYOILU3vEBsq/z56w YBfg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776173729; x=1776778529; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=MrpH3O/UC588LGlyijfHqwmmf8Fc2A9hjyYsMCvb23A=; b=Go0OniygFT8Mr6kw9zTum6SrDIDrVJQ1nOPOoL6nZ2zZnXV2haPFSv48MPhft1Efwj AXpcrgm5MWFS4ADFQZKxOT8C630mtka7GXiIjHUbWP325gWAE7ZWQfxcFT21IkVq/0dI su60EicuMVAh2HMFT/CC/CJ7A+GmqY9EN+FMOr3BKJXwAYSyyz6McxsL478TUh4krqK1 T5G90aPMcuzPxcT6Pc63/l6qkhuhIULaizJry6apaDGDeDFKAVjJ5s54xO0Nr+9jikLD 4u8FxyHnbz8AOt3hL12n0rV5D5WwvEhjZOnPJ/PmhoLznebopu4sirAgw/VVhslLwSVB Qldw== X-Forwarded-Encrypted: i=1; AFNElJ8h9T9vmyK3mSJtEtZ7LsXrPfFh02uODI/Lumn9otlZnJKY8CxkiPH6OmAg1PgwTmtV1RHKUW2LGpq8oF0zZFhQ@lists.infradead.org X-Gm-Message-State: AOJu0Yw0qsNvfKJVy5U7n9ZbkmiukjuAGOQKXv83fP9R3Dbkiy0UhDH2 lyuhRjQhusiOHHenHPBwTP6L7gfITpBXo7i2e21X6XRGnglXZa46skadmsTS83pKHjM= X-Gm-Gg: AeBDieuruWYnO9F5S45gkmdyU9tFN7QvECRAQjZ3V0ZoDMkQ2bv1qK/QKBujkWaotXM kTtV/p3S3i86ez08VHH5Q/NF2f3XkZUhaanhWeqXUN/NbdEKoU2M2oatj0dit7G8ZEFYj3dZKEm opSMpw5iWJpW1nFPsgpHVoUZly9QPiL7rES1Ml1q/0ufGIqiLfq6RBL1KfqPZOrtT/yr1azC+fU IKn8Msugsq9eDGKHd+Ptd7tloAHuZCRAoCXMnWXNOCO4RpsNqkI9Q5LGUsgSHjmy2iEV5CwGKKH Hc7sGjgZxZl0o1oAbR+m5M0aYDfti8Qvz3tsHX7Q8jpsrme8XdcdNitNciEhvOTuWeRMk6n4v58 gib8RzsE9ldOAwA1DZuM7HLH4dioOvI2Y8uqQXjJzK047JMp13zKUywLqlObFseG9m2bDRJfU5R 9nN20gejVoQXviNN4MWSstNhqALtYngpCu5RPkscAEb1ahECxfWvyAFICzXqoaBQhgL4b+PV/7M AXKvg== X-Received: by 2002:ad4:5ce2:0:b0:8ac:b1ce:3244 with SMTP id 6a1803df08f44-8acb1ce41efmr112063456d6.19.1776173728649; Tue, 14 Apr 2026 06:35:28 -0700 (PDT) Received: from ziepe.ca (crbknf0213w-47-54-130-67.pppoe-dynamic.high-speed.nl.bellaliant.net. [47.54.130.67]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8aca259724csm71335146d6.12.2026.04.14.06.35.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Apr 2026 06:35:26 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wCdvJ-0000000Ay68-2r97; Tue, 14 Apr 2026 10:35:25 -0300 Date: Tue, 14 Apr 2026 10:35:25 -0300 From: Jason Gunthorpe To: Suzuki K Poulose Cc: Sami Mujawar , Dan Williams , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, thuth@redhat.com, steven.price@arm.com, gshan@redhat.com, YeoReum.Yun@arm.com, cedric.xing@intel.com, Dan Williams , Dionna Glaze , "Aneesh Kumar K . V" , Alexey Kardashevskiy , "linux-coco@lists.linux.dev" Subject: Re: [PATCH 0/3] arm64/virt: Add Arm CCA measurement register support Message-ID: <20260414133525.GA2577880@ziepe.ca> References: <20260413084957.327661-1-sami.mujawar@arm.com> <20260413125925.GK3694781@ziepe.ca> <514ddb27-137b-4223-84fe-2152737db3a6@arm.com> <20260414122950.GW3694781@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260414_063530_600503_5F1BB846 X-CRM114-Status: GOOD ( 16.91 ) 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 On Tue, Apr 14, 2026 at 02:26:58PM +0100, Suzuki K Poulose wrote: > On 14/04/2026 13:29, Jason Gunthorpe wrote: > > On Tue, Apr 14, 2026 at 11:10:51AM +0100, Suzuki K Poulose wrote: > > > > > > Isn't this also sort of incomplete? Doesn't anything serious need > > > > signed measurements? Isnt't there alot more data that comes out of RMM > > > > than just a few measurement registers? > > > As mentioned above, this series adds the support for Runtime Extendible > > > Measurements (REM in CCA, RTMR on TDX). The RIM+Platform Attestation is > > > already provided via the TSM_REPORT > > > > Okay, but what actual use is this? > > > > Good point. This REMs are planned to be used for EFI_CC_MEASUREMENT_PROTOCOL > as described below: > > https://github.com/tianocore/edk2/issues/11383 So this is tying it to the same FW event log that TPM uses. I think that strengthens my point this should all be uninform. TPM drivers are directly exposing the event log today, but I guess that needs generalization if non-TPM drivers are going to present it as well. How do you imagine getting and manipulating the EFI event log to use with this? Jason