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([2001:b07:6468:f312:e4f4:3c00:2b79:d6dc]) by smtp.gmail.com with ESMTPSA id r17sm5880306wrx.46.2020.03.25.10.06.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 25 Mar 2020 10:06:17 -0700 (PDT) Subject: Re: [PATCH v3] piix: fix xenfv regression, add compat machine xenfv-qemu4 To: Olaf Hering References: <20200113174521.3336-1-olaf@aepfle.de> <20200325064736.22416-1-olaf@aepfle.de> <9123dcfd-862f-8986-b728-f4b3d806aea6@redhat.com> <20200325164522.39869e56.olaf@aepfle.de> From: Paolo Bonzini Message-ID: Date: Wed, 25 Mar 2020 18:06:16 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200325164522.39869e56.olaf@aepfle.de> Content-Language: en-US X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 63.128.21.74 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: "open list:All patches CC here" , "Michael S. Tsirkin" , Eduardo Habkost , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 25/03/20 16:45, Olaf Hering wrote: >> hw_compat_3_1 and pc_compat_3_1 > I have asked about this earlier, so again: >=20 > What do all these arrays do in the context of 'xenfv' to the emulated sys= tem? They change the hardware and CPU features that is presented to the VMs, if the respective devices are included in the virtual machine. For example USB devices will have a different serial number on 3.1 and 5.0, and VGA devices present EDID information on 4.1+. Paolo