From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id D9E133914E8 for ; Tue, 29 Sep 2026 19:42:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790710962; cv=none; b=fAJ7YjCv2ORchDkcrmih5GXYXZtfoLY1qifMm6UsdQeRRoiWRGYmFZnxA08hQgK393Afqijn/53s3KAggKV77+N98rkw3gGS1qdTzORaSDb07QtAgT9SXn0s7mN/GzonXC8J0uGzKGMSyPREFycqJaXbpqr6ZJI+pATBVy97OIg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790710962; c=relaxed/simple; bh=ESSzXC3ElNzYM9W3zJWJEtqXMttntxbSA8BNS/JPV1U=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=R98kwiUpzDIyR8XIMh7a47ODKPfJukPN1D7E6vyfeAlGHPigiQpa9oopSILzRranV002kun9zeafdrvA3GuLpN+eHwOVeNbzH/V4WLeIr9fcHA695Qz48qy7Lmv//vt3/L5YRUba5yoUpsyfNO7B0QHt5CYe0zEoiesrRyHVVho= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=OW6eCzzi; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="OW6eCzzi" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id ABF91143D; Tue, 29 Sep 2026 12:42:36 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id AD1CB3F763; Tue, 29 Sep 2026 12:42:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790710960; bh=ESSzXC3ElNzYM9W3zJWJEtqXMttntxbSA8BNS/JPV1U=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=OW6eCzziJsXe5B/0ftjUDaCx3pFCKpJogr2XrGrjGlj1HY+KgAsmzP7q4kQK7ZnN4 PL7WBZj8nkyQhI73V4GkNOAeaa7sRHwBarJjE7iZp9Nks4KCR6HMvkmyAYOulajdvO bL2B8Zq5Y+dWNg6ATfPqUeVF5ny7R9B49G0hqokQ= Date: Tue, 29 Sep 2026 20:42:36 +0100 From: Yeoreum Yun To: Jason Gunthorpe Cc: Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Suzuki Poulose , Steven Price , Sami Mujawar , thuth@redhat.com, Jiri Pirko Subject: Re: [PATCH v2 0/3] arm64/virt: Add Arm CCA measurement register support Message-ID: References: <20260929-arm_cca_mr-v2-0-1d98bba187fd@arm.com> <20260929192051.GN163130@ziepe.ca> 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: <20260929192051.GN163130@ziepe.ca> On Tue, Sep 29, 2026 at 04:20:51PM -0300, Jason Gunthorpe wrote: > On Tue, Sep 29, 2026 at 05:57:46PM +0100, Yeoreum Yun wrote: > > This series adds support for Arm Confidential Compute Architecture (CCA) > > measurement registers in the Linux kernel, enabling guest Realms to > > access, extend, and expose measurement values for attestation and runtime > > integrity tracking. > > I'd prefer not to add any more tsm_measurements users until we bottom > out on the attestation subsystem.. Mainly because it establishes uAPI > that doesn't really do everything people need from this stuff.. Tend to agree. However, I think this seems like an integration with the attestation subsystem. IOW, although the functionality and interface are currently scattered, the functionality of the TSM MR doesn't change — showing the current measurement register status and generating a token with a challenge. Therefore, even if the subsystem is refactored, I don't think this would be a burden for it, and personally, I'd like to see this patch series emancipated from almost six months of waiting ;) > > The actual code seemed reasonble from a quick glance. Thanks! -- Sincerely, Yeoreum Yun