From nobody Tue Feb 10 06:58:03 2026 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=1610582698; cv=none; d=zohomail.com; s=zohoarc; b=NhXIQR9loqU9mP2B/8MEOprjNXveMz/7k9xpb9lsEMC7CdeyuucO661PfVxsAU8J4MsGltHcrm+X1poMuKP0USueDQodzw6zmnsKilReDZgEQ6jCxqo5AfsHcABykZQralCxS/AM0GgA3WmAZTJZULdzrgg+gCoBWmEkLSK9wRY= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1610582698; 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=Mb69v1PZ9dWjdM9+DrYmfZqLz/fYTIyH1SaCTINwAbU=; b=FC6SjN5PbuzxY7RFRcpifk2v1IuNNywPw6OWd51rcQhgDOc0tJdqI4NvNt1XgDU58D7LVo/D6AI60V7BhU/9oxRVFLTVbTnl5xMPA1DLPDnnr7T/zydlbKvH4RZC5v5+XuPzzx9Cli3a1HzwO1G3H2yZEKZq3xh4BlpgLZzv5P0= 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 16105826987621003.7803863563687; Wed, 13 Jan 2021 16:04:58 -0800 (PST) Received: from localhost ([::1]:41114 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kzq8H-00055T-L2 for importer@patchew.org; Wed, 13 Jan 2021 19:04:57 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:36516) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kzq28-0007J8-2m; Wed, 13 Jan 2021 18:58:36 -0500 Received: from ozlabs.org ([2401:3900:2:1::2]:42003) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kzq25-0006fH-Ts; Wed, 13 Jan 2021 18:58:35 -0500 Received: by ozlabs.org (Postfix, from userid 1007) id 4DGPXR0hDnz9sX1; Thu, 14 Jan 2021 10:58:15 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1610582295; bh=XAe7Xx+YpNUPHcyhxW/cHKgMuEbgQoNbc1c/1ol/ah8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WHrQo0CpGmuAyajbdwUMx7qgn9Kr7iTclU8Uk3Goi3mgJfMWU9Nzex3+mn0SUfPIy xecXjdlhCJ1+mTEjl5fbqWu0n2T0lKHXdsVYiVX+tGC9y732Yulz2rRkTGA0sx0BfA V3fI8nw9ocNIb/PNhEsP0m0vgGwV8LbBBaXzbDoM= From: David Gibson To: brijesh.singh@amd.com, pair@us.ibm.com, dgilbert@redhat.com, pasic@linux.ibm.com, qemu-devel@nongnu.org Subject: [PATCH v7 09/13] confidential guest support: Update documentation Date: Thu, 14 Jan 2021 10:58:07 +1100 Message-Id: <20210113235811.1909610-10-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210113235811.1909610-1-david@gibson.dropbear.id.au> References: <20210113235811.1909610-1-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=2401:3900:2:1::2; 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, thuth@redhat.com, Marcelo Tosatti , berrange@redhat.com, jun.nakajima@intel.com, kvm@vger.kernel.org, David Hildenbrand , cohuck@redhat.com, Richard Henderson , Greg Kurz , mdroth@linux.vnet.ibm.com, 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 , Eduardo Habkost 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..2790425b38 --- /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