linux-kernel - Re: [PATCH v2 0/4] tsm: Unified Measurement Register ABI for TVMs

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Message-ID: <7a160eed-5c27-4216-89e3-14bf61e1d2ed@intel.com>
Date: Mon, 17 Mar 2025 22:48:00 -0500
From: "Xing, Cedric" <cedric.xing@...el.com>
To: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	Dan Williams <dan.j.williams@...el.com>, "Kirill A. Shutemov"
	<kirill.shutemov@...ux.intel.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>, <x86@...nel.org>, "H. Peter Anvin"
	<hpa@...or.com>
CC: <linux-kernel@...r.kernel.org>, <linux-coco@...ts.linux.dev>, "Dionna
 Amalie Glaze" <dionnaglaze@...gle.com>, James Bottomley
	<James.Bottomley@...senPartnership.com>, Dan Middleton
	<dan.middleton@...ux.intel.com>, Mikko Ylinen <mikko.ylinen@...ux.intel.com>
Subject: Re: [PATCH v2 0/4] tsm: Unified Measurement Register ABI for TVMs

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?
> 
The event log support was once proposed and discussed. Please see 
https://lore.kernel.org/all/20240907-tsm-rtmr-v1-0-12fc4d43d4e7@intel.com/ 
for details. In short, it's difficult to define a log format that fits 
all applications, and luckily it doesn't have to be solved in kernel 
mode, so we leave it out for now.