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Tue, 14 Jan 2020 02:44:02 -0800 (PST) Subject: Re: Priority of -accel To: Markus Armbruster References: <20200106130951.29873-1-philmd@redhat.com> <12334054-4ae7-e580-9727-2d322bfa2bda@redhat.com> <1A5859EA-4403-4921-B527-DFD07C59C702@redhat.com> <360fa010-ba80-b02b-3a35-19c2b48a462d@redhat.com> <87d0bnwct1.fsf@dusky.pond.sub.org> <87lfqajtwh.fsf@dusky.pond.sub.org> From: Paolo Bonzini Message-ID: Date: Tue, 14 Jan 2020 11:44:01 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <87lfqajtwh.fsf@dusky.pond.sub.org> Content-Language: en-US X-MC-Unique: oF3dn6w2PuGRY24GUIcEiA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 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: Kevin Wolf , Thomas Huth , Daniel Berrange , qemu-block@nongnu.org, qemu-devel@nongnu.org, Wainer dos Santos Moschetta , Max Reitz , Christophe de Dinechin , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 14/01/20 09:59, Markus Armbruster wrote: > Paolo Bonzini writes: > >> On 13/01/20 17:17, Markus Armbruster wrote: >>> Perfect opportunity to change the default to something more useful. >> >> I am not sure acutally if it's that more useful, now that we have >> sanctioned qemu-kvm as the fast alternative. > > If there is a fast alternative, why ship the slow one? I find it more consistent that qemu-system-* is doing emulation (and can usually be ignored) and qemu-kvm is doing virtualization. It's more intuitive to launch qemu-system-x86_64 than "qemu-kvm --no-kvm". What we could do is automatically install a qemu-kvm binary for the "most suitable" target that has KVM enabled (i.e. for qemu-system-x86_64, not qemu-system-i386) instead of leaving it to distros. Paolo > No matter what we do, somebody is going to be confused. How to resolve > such a conundrum? Utilitarian philosophy teaches us to pursue the > greatest confusion of the greatest numbers. I think not using x86 > hardware virtualization by default has been admirably successful there.