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 3101DCA5FA5 for ; Tue, 29 Sep 2026 21:00:23 +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-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=zALWSTZnD0miNW/ksHJ9EMAP89ltv5CaAY2GmdBEiYY=; b=h93uAaiT8+pQJL/XX4jZLROGmv 7bAt65qP+0pStW0O5lR2OtbBrRAe2NjL/bKBJoxGNthcH0VA0540STa4lifhw5F3SzASxWGJUwoy6 6/P8NJno8cWSWN+MOxvnDUhI+tJkE7aHcReI/UT1qWG3rj9QnTuL7cVQT2WHvu4AhclmWqBoZhFvw Txe6hOiI5Z6LA3pLV/nhZ0VuJpq9kBuGqGQCtta68dlkUmrwZ+n7NdxNSsECHRyF0nV6uTkwZzrKV sRtTkHLqJpqLZ45ZniRUBfBQEZiuh3WlXjH2L0AfB/larsre4glVzKdaJ0QX80EuR5AASLuK1imK/ UFk8FNnw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBdj5-00000004PWO-2I4h; Tue, 29 Sep 2026 19:42:55 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBdj4-00000004PVj-1WQA for linux-arm-kernel@bombadil.infradead.org; Tue, 29 Sep 2026 19:42:54 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=zALWSTZnD0miNW/ksHJ9EMAP89ltv5CaAY2GmdBEiYY=; b=M1QhZLtZV8fCkyBq2eoYT+MqQA x+DtOxmoZiJZ5y4eC2jtaIf5fztXg5rtongXp4g8LFeYfB34p1mUPNN1aSI4Zz7v9EdjO64ZN8m4n WWn4DZaM2Uv8jzyVd9pDBEwbvLFeLyjO/6dA2z/hIJ+kSJeOLrjrqwKv0oj11TPJ7jh4oL0TSlQM9 n8qAOw0dOm0f5XR+YsbdlBOzM1Ux70HiNswNLdGrnKZvBpAuEvtXofAbp8i57RBzc6bkcVDHaHnov YCt5KVHBJdrmGnafvnV1IL+kP9+SUmWevGjMxoQFENHfa1nbv3bqckDa0LNjtIya+YJIZ2xDJNU/s WXTU4PPA==; Received: from foss.arm.com ([217.140.110.172]) by desiato.infradead.org with esmtp (Exim 4.99.2 #2 (Red Hat Linux)) id 1xBdis-000000031ju-1xzk for linux-arm-kernel@lists.infradead.org; Tue, 29 Sep 2026 19:42:45 +0000 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> 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> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260929_204243_124223_0569CEF0 X-CRM114-Status: GOOD ( 18.62 ) 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, 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