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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF43FC742A2 for ; Fri, 12 Jul 2019 01:43:58 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id BB4B5214AF for ; Fri, 12 Jul 2019 01:43:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BB4B5214AF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.vnet.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:46164 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hlkbN-000799-Kx for qemu-devel@archiver.kernel.org; Thu, 11 Jul 2019 21:43:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60970) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hlkb6-0006Jw-4Q for qemu-devel@nongnu.org; Thu, 11 Jul 2019 21:43:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hlkb4-0003Fa-U4 for qemu-devel@nongnu.org; Thu, 11 Jul 2019 21:43:40 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:19674) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hlkb4-0003Ep-JU for qemu-devel@nongnu.org; Thu, 11 Jul 2019 21:43:38 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x6C1gDrJ140247 for ; Thu, 11 Jul 2019 21:43:37 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0a-001b2d01.pphosted.com with ESMTP id 2tpdxt4y0r-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 11 Jul 2019 21:43:37 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 12 Jul 2019 02:20:30 +0100 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x6C1K1Bm36962596 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 12 Jul 2019 01:20:01 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7EE8DB206B; Fri, 12 Jul 2019 01:20:01 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6C20BB2066; Fri, 12 Jul 2019 01:20:01 +0000 (GMT) Received: from localhost (unknown [9.53.179.212]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 12 Jul 2019 01:20:01 +0000 (GMT) From: Michael Roth To: qemu-devel@nongnu.org Date: Thu, 11 Jul 2019 20:19:33 -0500 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190712011934.29863-1-mdroth@linux.vnet.ibm.com> References: <20190712011934.29863-1-mdroth@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19071201-0064-0000-0000-000003FA8FFF X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011412; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000286; SDB=6.01230877; UDB=6.00648363; IPR=6.01012152; MB=3.00027683; MTD=3.00000008; XFM=3.00000015; UTC=2019-07-12 01:21:00 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19071201-0065-0000-0000-00003E3A2A2E Message-Id: <20190712011934.29863-2-mdroth@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-07-11_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907120020 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PATCH 1/2] docs/specs: initial spec summary for Ultravisor-related hcalls X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxram@us.ibm.com, qemu-ppc@nongnu.org, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" For now this only covers hcalls relating to TPM communication since it's the only one particularly important from a QEMU perspective atm, but others can be added here where it makes sense. The full specification for all hcalls/ucalls will eventually be made available in the public/OpenPower version of the PAPR specification. Signed-off-by: Michael Roth --- docs/specs/ppc-spapr-uv-hcalls.txt | 74 ++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 docs/specs/ppc-spapr-uv-hcalls.txt diff --git a/docs/specs/ppc-spapr-uv-hcalls.txt b/docs/specs/ppc-spapr-uv-hcalls.txt new file mode 100644 index 0000000000..0278f89190 --- /dev/null +++ b/docs/specs/ppc-spapr-uv-hcalls.txt @@ -0,0 +1,74 @@ +On PPC64 systems supporting Protected Execution Facility (PEF), system +memory can be placed in a secured region where only an "ultravisor" +running in firmware can provide to access it. pseries guests on such +systems can communicate with the ultravisor (via ultracalls) to switch to a +secure VM mode (SVM) where the guest's memory is relocated to this secured +region, making its memory inaccessible to normal processes/guests running on +the host. + +The various ultracalls/hypercalls relating to SVM mode are currently +only documented internally, but are planned for direct inclusion into the +public OpenPOWER version of the PAPR specification (LoPAPR/LoPAR). An internal +ACR has been filed to reserve a hypercall number range specific to this +use-case to avoid any future conflicts with the internally-maintained PAPR +specification. This document summarizes some of these details as they relate +to QEMU. + +== hypercalls needed by the ultravisor == + +Switching to SVM mode involves a number of hcalls issued by the ultravisor +to the hypervisor to orchestrate the movement of guest memory to secure +memory and various other aspects SVM mode. The below documents the hcalls +relevant to QEMU. + +- H_TPM_COMM (0xef10) + + For TPM_COMM_OP_EXECUTE operation: + Send a request to a TPM and receive a response, opening a new TPM session + if one has not already been opened. + + For TPM_COMM_OP_CLOSE_SESSION operation: + Close the existing TPM session, if any. + + Arguments: + + r3 : H_TPM_COMM (0xef10) + r4 : TPM operation, one of: + TPM_COMM_OP_EXECUTE (0x1) + TPM_COMM_OP_CLOSE_SESSION (0x2) + r5 : in_buffer, guest physical address of buffer containing the request + - Caller may use the same address for both request and response + r6 : in_size, size of the in buffer, must + - Must be less than or equal to 4KB + r7 : out_buffer, guest physical address of buffer to store the response + - Caller may use the same address for both request and response + r8 : out_size, size of the out buffer + - Must be at least 4KB, as this is the maximum request/response size + supported by most TPM implementations, including the TPM Resource + Manager in the linux kernel. + + Return values: + + r3 : H_Success request processed successfully + H_PARAMETER invalid TPM operation + H_P2 in_buffer is invalid + H_P3 in_size is invalid + H_P4 out_buffer is invalid + H_P5 out_size is invalid + H_RESOURCE TPM is unavailable + r4 : For TPM_COMM_OP_EXECUTE, the size of the response will be stored here + upon success. + + Use-case/notes: + + SVM filesystems are encrypted using a symmetric key. This key is then + wrapped/encrypted using the public key of a trusted system which has the + private key stored in the system's TPM. An Ultravisor will use this + hcall to unwrap/unseal the symmetric key using the system's TPM device + or a TPM Resource Manager associated with the device. + + The Ultravisor sets up a separate session key with the TPM in advance + during host system boot. All sensitive in and out values will be + encrypted using the session key. Though the hypervisor will see the 'in' + and 'out' buffers in raw form, any sensitive contents will generally be + encrypted using this session key. -- 2.17.1