From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from list by lists.gnu.org with archive (Exim 4.71) id 1fWQWo-0001uq-5i for mharc-qemu-trivial@gnu.org; Fri, 22 Jun 2018 14:11:22 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60316) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fWQWm-0001tW-9j for qemu-trivial@nongnu.org; Fri, 22 Jun 2018 14:11:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fWQWl-0000iO-Fv for qemu-trivial@nongnu.org; Fri, 22 Jun 2018 14:11:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33480) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fWQWg-0000hK-4v; Fri, 22 Jun 2018 14:11:14 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0E8473082A39; Fri, 22 Jun 2018 18:11:13 +0000 (UTC) Received: from localhost (ovpn-116-16.gru2.redhat.com [10.97.116.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id AF89C413B; Fri, 22 Jun 2018 18:11:10 +0000 (UTC) Date: Fri, 22 Jun 2018 15:11:09 -0300 From: Eduardo Habkost To: Paolo Bonzini Cc: Cornelia Huck , Markus Armbruster , Daniel =?iso-8859-1?Q?P=2E_Berrang=E9?= , Thomas Huth , zhang.zhanghailiang@huawei.com, Ben Warren , qemu-trivial@nongnu.org, qemu-devel@nongnu.org, Stefan Hajnoczi Message-ID: <20180622181108.GY7451@localhost.localdomain> References: <1528866321-23886-1-git-send-email-thuth@redhat.com> <1528866321-23886-5-git-send-email-thuth@redhat.com> <20180613133840.GK24528@stefanha-x1.localdomain> <20180613134452.GU19901@redhat.com> <20180613151942.GC19901@redhat.com> <87k1r24quk.fsf@dusky.pond.sub.org> <20180619171539.0adc90d6.cohuck@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Fnord: you can see the fnord User-Agent: Mutt/1.9.2 (2017-12-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Fri, 22 Jun 2018 18:11:13 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-trivial] [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore X-BeenThere: qemu-trivial@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Jun 2018 18:11:21 -0000 On Tue, Jun 19, 2018 at 06:16:33PM +0200, Paolo Bonzini wrote: > On 19/06/2018 17:15, Cornelia Huck wrote: > >> Why does a user have to know how to enable KVM? Oh, because our default > >> is "run this guest much slower than necessary". Great! > > Should we try again to default to a better accelerator, if possible? I > > don't quite recall why we didn't do so the last time that came up... > > was it tests? > > My plan was to create qemu-{kvm,hax,hvf,whpx} binaries that default to a > better accelerator, and leave qemu-system-* as defaulting to TCG. This > matches what distributions already do. Why is this better than using KVM by default if it's available? -- Eduardo