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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 E8D41C48BC3 for ; Tue, 20 Feb 2024 16:15:43 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rcSmC-00037Z-Gs; Tue, 20 Feb 2024 11:15:24 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rcSls-00035r-ND for qemu-devel@nongnu.org; Tue, 20 Feb 2024 11:15:06 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rcSlq-0006dx-FI for qemu-devel@nongnu.org; Tue, 20 Feb 2024 11:15:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1708445701; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=T7u28xwIheG3uxovuWZOpEtSYb8aZ/auv1OID/d5NrA=; b=epE+I2EVnjdC1JhU+soqHdtvMNC9uSmu51WG0J0MwgqFdJo14ryCcpi4trr0We3/6WsDgg gMCVpSIoZi4xwhBLF1aBw8LQyGpCUWYAr52CiBeO9dbjj0jHHw89oRmLC+RSXZ1QGcYLr4 iNyr8xSfpAjo0elTPB05CYjzkov7up8= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-444-jbZ68DtwOku-M8uuakTlmw-1; Tue, 20 Feb 2024 11:14:58 -0500 X-MC-Unique: jbZ68DtwOku-M8uuakTlmw-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (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 mimecast-mx02.redhat.com (Postfix) with ESMTPS id 99F3E3814582; Tue, 20 Feb 2024 16:14:57 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.39.192.55]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3C22810802; Tue, 20 Feb 2024 16:14:57 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 07D0B21E6740; Tue, 20 Feb 2024 17:14:55 +0100 (CET) From: Markus Armbruster To: Xiaoyao Li Cc: Paolo Bonzini , David Hildenbrand , Igor Mammedov , "Michael S . Tsirkin" , Marcel Apfelbaum , Richard Henderson , Peter Xu , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Cornelia Huck , Daniel =?utf-8?Q?P=2EBerrang=C3=A9?= , Eric Blake , Marcelo Tosatti , qemu-devel@nongnu.org, kvm@vger.kernel.org, Michael Roth , Sean Christopherson , Claudio Fontana , Gerd Hoffmann , Isaku Yamahata , Chenyi Qiang Subject: Re: [PATCH v4 29/66] i386/tdx: Support user configurable mrconfigid/mrowner/mrownerconfig In-Reply-To: (Xiaoyao Li's message of "Tue, 20 Feb 2024 23:10:29 +0800") References: <20240125032328.2522472-1-xiaoyao.li@intel.com> <20240125032328.2522472-30-xiaoyao.li@intel.com> <875xykfwmf.fsf@pond.sub.org> Date: Tue, 20 Feb 2024 17:14:55 +0100 Message-ID: <87le7f3yf4.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 Received-SPF: pass client-ip=170.10.133.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.05, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Xiaoyao Li writes: > On 2/19/2024 8:48 PM, Markus Armbruster wrote: >> Xiaoyao Li writes: >>=20 >>> From: Isaku Yamahata >>> >>> Three sha384 hash values, mrconfigid, mrowner and mrownerconfig, of a TD >>> can be provided for TDX attestation. Detailed meaning of them can be >>> found: https://lore.kernel.org/qemu-devel/31d6dbc1-f453-4cef-ab08-4813f= 4e0ff92@intel.com/ >>> >>> Allow user to specify those values via property mrconfigid, mrowner and >>> mrownerconfig. They are all in base64 format. >>> >>> example >>> -object tdx-guest, \ >>> mrconfigid=3DASNFZ4mrze8BI0VniavN7wEjRWeJq83vASNFZ4mrze8BI0VniavN7wE= jRWeJq83v,\ >>> mrowner=3DASNFZ4mrze8BI0VniavN7wEjRWeJq83vASNFZ4mrze8BI0VniavN7wEjRW= eJq83v,\ >>> mrownerconfig=3DASNFZ4mrze8BI0VniavN7wEjRWeJq83vASNFZ4mrze8BI0VniavN= 7wEjRWeJq83v >>> >>> Signed-off-by: Isaku Yamahata >>> Co-developed-by: Xiaoyao Li >>> Signed-off-by: Xiaoyao Li >>> >>> --- >>> Changes in v4: >>> - describe more of there fields in qom.json >>> - free the old value before set new value to avoid memory leak in >>> _setter(); (Daniel) >>> >>> Changes in v3: >>> - use base64 encoding instread of hex-string; >>> --- >>> qapi/qom.json | 14 ++++++- >>> target/i386/kvm/tdx.c | 87 +++++++++++++++++++++++++++++++++++++++++++ >>> target/i386/kvm/tdx.h | 3 ++ >>> 3 files changed, 103 insertions(+), 1 deletion(-) >>> >>> diff --git a/qapi/qom.json b/qapi/qom.json >>> index 2177f3101382..15445f9e41fc 100644 >>> --- a/qapi/qom.json >>> +++ b/qapi/qom.json >>> @@ -905,10 +905,22 @@ >>> # pages. Some guest OS (e.g., Linux TD guest) may require this to >>> # be set, otherwise they refuse to boot. >>> # >>> +# @mrconfigid: ID for non-owner-defined configuration of the guest TD, >>> +# e.g., run-time or OS configuration. base64 encoded SHA384 diges= t. >>=20 >> "base64 encoded SHA384" is not a sentence. >>=20 >> Double-checking: the data being hashed here is the "non-owner-defined >> configuration of the guest TD", and the resulting hash is the "ID"? > > yes. The "ID" here means the resulting hash. > > The reason to use "ID" here because in the TDX spec, it's description is > > Software-defined ID for non-owner-defined configuration of the guest > TD - e.g., run-time or OS configuration. > > If ID is confusing, how about > > SHA384 hash of non-owner-defined configuration of the guest TD, e.g., > run-time of OS configuration. It's base64 encoded. I guess staying close to the TDX spec makes sense. We still need to mention the base64 encoding. What about something like ID for non-owner-defined configuration of the guest TD, e.g., run-time or OS configuration (base64 encoded SHA384 digest) or, if we decide that the fact it's SHA384 digest is irrelevant for QMP ID for non-owner-defined configuration of the guest TD, e.g., run-time or OS configuration (base64 encoded) >>> +# >>> +# @mrowner: ID for the guest TD=E2=80=99s owner. base64 encoded SHA38= 4 digest. >>=20 >> Likewise. >>=20 >>> +# >>> +# @mrownerconfig: ID for owner-defined configuration of the guest TD, >>> +# e.g., specific to the workload rather than the run-time or OS. >>> +# base64 encoded SHA384 digest. >>=20 >> Likewise. >>=20 >>> +# >>> # Since: 9.0 >>> ## >>> { 'struct': 'TdxGuestProperties', >>> - 'data': { '*sept-ve-disable': 'bool' } } >>> + 'data': { '*sept-ve-disable': 'bool', >>> + '*mrconfigid': 'str', >>> + '*mrowner': 'str', >>> + '*mrownerconfig': 'str' } } >>=20 >> The new members are optional, but their description in the doc comment >> doesn't explain behavior when present vs. behavior when absent. >>=20 >>>=20=20=20 >>> ## >>> # @ThreadContextProperties: >>=20 >> [...] >>=20 >>=20