From nobody Tue Nov 18 21:13:10 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1612784794; cv=none; d=zohomail.com; s=zohoarc; b=e8HWNIy2By7R9oZ0dHoQ8jGvoonQpT3bArqVbEr5HT767pMiTpvwD2kDkUqz6kPPHkfNuR3oNMMXB2s7UtYvCJEzIXcwloz/TsBT7vJmvccnOa+IC5wMq1MXAlnTzRfzEkJdjxd2cnDrFGb4JbCWf7erExjir+7FbsQ6WWIkSBo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1612784794; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=Euvvk8sj5sRKOUxH5idoLI7CSOp3Ke9pFU1VV1wY6wQ=; b=mxYgJ9w0wlsWn3vcqQjNZ4Iu43Pd8N6uQVIP/BveQrZVzjgefjtFqtdwdh6VNU499WLhluuMPum2ePIspIQziaowH9lTElgy/yDG8v6bSdL3NRR7s+m6Cwoxs/PY7uP37g3l1x8vdQ8QtJoadcuIDjDhTiHlHia97rgzVOpk/9g= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1612784794102524.6409226154342; Mon, 8 Feb 2021 03:46:34 -0800 (PST) Received: from localhost ([::1]:33824 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l94zw-0000zN-VL for importer@patchew.org; Mon, 08 Feb 2021 06:46:32 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:59048) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l8ziC-0002KD-Pj; Mon, 08 Feb 2021 01:07:52 -0500 Received: from bilbo.ozlabs.org ([203.11.71.1]:47717 helo=ozlabs.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l8ziA-0006ta-QO; Mon, 08 Feb 2021 01:07:52 -0500 Received: by ozlabs.org (Postfix, from userid 1007) id 4DYwY64qSJz9sWR; Mon, 8 Feb 2021 17:07:38 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1612764458; bh=EX4Wo8XL9ghYEf3SyZWEad+uxvbQlvG/RZ3Zj48wzzQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gE//jotXTS1nuRpkRS3lwTtC8TlpwYP3Nyqf9CTcvtXus/lLSCuVw3p7bQWa/J/7L zoQqN2N2z6pzJwbRJ9ayRrAy8ATieopI6qLpe7ASGR2L6HIzPYSE1Y6Lwu20/sD5ZM 1+cGw6Tz3Aw6ZFD37NoY9C2sFhHsIGeu0ZE3LNzw= From: David Gibson To: pair@us.ibm.com, qemu-devel@nongnu.org, peter.maydell@linaro.org, dgilbert@redhat.com, brijesh.singh@amd.com, pasic@linux.ibm.com Subject: [PULL v9 09/13] confidential guest support: Update documentation Date: Mon, 8 Feb 2021 17:07:31 +1100 Message-Id: <20210208060735.39838-10-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210208060735.39838-1-david@gibson.dropbear.id.au> References: <20210208060735.39838-1-david@gibson.dropbear.id.au> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=203.11.71.1; envelope-from=dgibson@ozlabs.org; helo=ozlabs.org X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.248, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action 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: qemu-ppc@nongnu.org, Thomas Huth , cohuck@redhat.com, berrange@redhat.com, ehabkost@redhat.com, kvm@vger.kernel.org, david@redhat.com, jun.nakajima@intel.com, mtosatti@redhat.com, richard.henderson@linaro.org, mdroth@linux.vnet.ibm.com, Greg Kurz , borntraeger@de.ibm.com, qemu-s390x@nongnu.org, frankja@linux.ibm.com, mst@redhat.com, pragyansri.pathi@intel.com, andi.kleen@intel.com, Paolo Bonzini , David Gibson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Now that we've implemented a generic machine option for configuring various confidential guest support mechanisms: 1. Update docs/amd-memory-encryption.txt to reference this rather than the earlier SEV specific option 2. Add a docs/confidential-guest-support.txt to cover the generalities of the confidential guest support scheme Signed-off-by: David Gibson Reviewed-by: Greg Kurz --- docs/amd-memory-encryption.txt | 2 +- docs/confidential-guest-support.txt | 43 +++++++++++++++++++++++++++++ 2 files changed, 44 insertions(+), 1 deletion(-) create mode 100644 docs/confidential-guest-support.txt diff --git a/docs/amd-memory-encryption.txt b/docs/amd-memory-encryption.txt index 80b8eb00e9..145896aec7 100644 --- a/docs/amd-memory-encryption.txt +++ b/docs/amd-memory-encryption.txt @@ -73,7 +73,7 @@ complete flow chart. To launch a SEV guest =20 # ${QEMU} \ - -machine ...,memory-encryption=3Dsev0 \ + -machine ...,confidential-guest-support=3Dsev0 \ -object sev-guest,id=3Dsev0,cbitpos=3D47,reduced-phys-bits=3D1 =20 Debugging diff --git a/docs/confidential-guest-support.txt b/docs/confidential-guest-= support.txt new file mode 100644 index 0000000000..bd439ac800 --- /dev/null +++ b/docs/confidential-guest-support.txt @@ -0,0 +1,43 @@ +Confidential Guest Support +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D + +Traditionally, hypervisors such as QEMU have complete access to a +guest's memory and other state, meaning that a compromised hypervisor +can compromise any of its guests. A number of platforms have added +mechanisms in hardware and/or firmware which give guests at least some +protection from a compromised hypervisor. This is obviously +especially desirable for public cloud environments. + +These mechanisms have different names and different modes of +operation, but are often referred to as Secure Guests or Confidential +Guests. We use the term "Confidential Guest Support" to distinguish +this from other aspects of guest security (such as security against +attacks from other guests, or from network sources). + +Running a Confidential Guest +---------------------------- + +To run a confidential guest you need to add two command line parameters: + +1. Use "-object" to create a "confidential guest support" object. The + type and parameters will vary with the specific mechanism to be + used +2. Set the "confidential-guest-support" machine parameter to the ID of + the object from (1). + +Example (for AMD SEV):: + + qemu-system-x86_64 \ + \ + -machine ...,confidential-guest-support=3Dsev0 \ + -object sev-guest,id=3Dsev0,cbitpos=3D47,reduced-phys-bits=3D1 + +Supported mechanisms +-------------------- + +Currently supported confidential guest mechanisms are: + +AMD Secure Encrypted Virtualization (SEV) + docs/amd-memory-encryption.txt + +Other mechanisms may be supported in future. --=20 2.29.2