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([2001:b07:6468:f312:197c:daa0:48d1:20b2]) by smtp.gmail.com with ESMTPSA id u126sm6565129wmu.9.2020.09.03.08.46.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Sep 2020 08:46:41 -0700 (PDT) Subject: Re: [RFC PATCH 00/12] hw: Forbid DMA write accesses to MMIO regions To: "Edgar E. Iglesias" , Peter Maydell References: <20200903110831.353476-1-philmd@redhat.com> <658fdd16-33da-af3a-6d8d-f7ea1253f061@redhat.com> <20200903142410.GX2954729@toto> From: Paolo Bonzini Message-ID: Date: Thu, 3 Sep 2020 17:46:39 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20200903142410.GX2954729@toto> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US Received-SPF: pass client-ip=205.139.110.61; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/03 01:28:33 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-2.403, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: "Michael S. Tsirkin" , Jason Wang , Mark Cave-Ayland , QEMU Developers , Peter Xu , Gerd Hoffmann , Robert Foley , "Edgar E . Iglesias" , Qemu-block , Li Qiang , "Emilio G . Cota" , Joel Stanley , Richard Henderson , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Eduardo Habkost , Alistair Francis , Richard Henderson , Beniamino Galvani , Eric Auger , qemu-arm , Jan Kiszka , =?UTF-8?Q?C=c3=a9dric_Le_Goater?= , Stefan Hajnoczi , John Snow , David Gibson , Tony Nguyen , Prasad J Pandit , Alexander Bulekov , Andrew Jeffery , Laszlo Ersek , Emanuele Giuseppe Esposito , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Andrew Baumann , qemu-ppc , Klaus Jensen , Peter Chubb Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 03/09/20 16:24, Edgar E. Iglesias wrote: >> [*] I do wonder about hardware-device-passthrough setups; I >> don't think I would care to pass through an arbitrary device >> to an untrusted guest... > Hmm, I guess it would make sense to have a configurable option in KVM > to isolate passthrough devices so they only can DMA to guest RAM... Passthrough devices are always protected by the IOMMU, anything else would be obviously insane^H^H^Hecure. :) Paolo