From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [198.37.111.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B97A120C488 for ; Tue, 18 Mar 2025 12:44:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.37.111.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742301849; cv=none; b=jowVRqOEGdfBaxK97+m8zROmlFqfr5E91L0PgVCuADYh5fYcyyLgap2JQWikfvPsySf97IzTGSnRomHNEDyZN+bG8Vla7I50MhErDIetJdcdkVa3cRT3OtDZd5DJ8SCeq4BSVqku1+et3Dm6D76+DO/GEdCKoKE66Nzi8PO/+dM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742301849; c=relaxed/simple; bh=ikzECYr8yceinWGb3dwc3WN0RjY8PFlEKISt9LDZJdU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=oCB76z7Op/KLYVXC9HV8Jtm6MHL5RLMgJW06zfhc3BSnV9KoUxnn28YTg6FU8f5PYbVVGg6rp45l057SyuZl39h9MMIVNH+ZBuEuLYfMEiTzATZnKmRJ7I2SoFQmXcVt7/qXjfIt/nSJz2FCB0XAtoPVbb34rj1cgb3LKFGfDj0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=K4tUgH7y; arc=none smtp.client-ip=198.37.111.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="K4tUgH7y" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1742301846; bh=ikzECYr8yceinWGb3dwc3WN0RjY8PFlEKISt9LDZJdU=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References:From; b=K4tUgH7ySIf6qMZ/K4Pa8/iSBUA3yibptKGcr3Fdj8DNOAj9zG09g8PUWxDG7DqZB 44ceHXMF2/YZduuTCyr7Y/Hokmq4KUWFH60bHxEdb9scn46dpnhypnOMjSi1w1yFRm KruYc4oqTbUGWZ3r0f0gYWcosTMjElcTdW4LyG7w= Received: from lingrow.int.hansenpartnership.com (unknown [IPv6:2601:5c4:4302:c21::a774]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lamorak.hansenpartnership.com (Postfix) with ESMTPSA id 1976B1C00F8; Tue, 18 Mar 2025 08:44:06 -0400 (EDT) Message-ID: Subject: Re: [PATCH v2 0/4] tsm: Unified Measurement Register ABI for TVMs From: James Bottomley To: "Xing, Cedric" , Sathyanarayanan Kuppuswamy , Dan Williams , "Kirill A. Shutemov" , Dave Hansen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" Cc: linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, Dionna Amalie Glaze , Dan Middleton , Mikko Ylinen Date: Tue, 18 Mar 2025 08:44:05 -0400 In-Reply-To: <7a160eed-5c27-4216-89e3-14bf61e1d2ed@intel.com> References: <20250223-tdx-rtmr-v2-0-f2d85b0a5f94@intel.com> <8e188239-44d2-42ad-9fa9-b46ad0a5b5bb@linux.intel.com> <7a160eed-5c27-4216-89e3-14bf61e1d2ed@intel.com> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; 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8mT2Eh9SkH+YVOmaKsajgZgrBxA7fWmGoxXswEVxJIFj3vW7yNc0C5HaUdYa5iGOMs4kg2ht4s7yy7NRQuh7BifWjo6BQ6k4S1H+6axZucxhSV1L6zN9d+lr3Xo/vy1unzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2025-03-17 at 22:48 -0500, Xing, Cedric wrote: > On 3/17/2025 6:15 PM, Sathyanarayanan Kuppuswamy wrote: > [...] > > Any comment on the missing event log support? Extending the > > measurements without logging the event should break the > > tractability feature. Can you add info about why it is ok to just > > add extension support for now? > >=20 > The event log support was once proposed and discussed. Please see=20 > https://lore.kernel.org/all/20240907-tsm-rtmr-v1-0-12fc4d43d4e7@intel.com= / > =C2=A0 > for details. In short, it's difficult to define a log format that > fits all applications,=20 I also think the interface doesn't have much utility without a log (at least the ability to write part). However, I think the problem is the quest for a single universal log. If you just allow the reflected consumers to use their own log format (and identify that format somewhere in the filesystem) it still all works. This would mean that plugging in IMA becomes simple and it would obviously just use the IMA log format. >From a non-repudiable record point of view there are definite reasons why mutually distrusting subsystems would want their own PCR and log anyway (so they can do separated replay), so I think supporting multiple logs is definitely a requirement. If we have multiple logs, there's not much of a problem with multiple formats. > and luckily it doesn't have to be solved in kernel mode, so we leave > it out for now. The problem, that will be hard to do a pure userspace solution for, is that adding a log entry and extending the PCR should be as close to atomic as you can get them. Regards, James