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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180622181108.GY7451@localhost.localdomain> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 22 Jun 2018 19:20:00 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 22 Jun 2018 19:20:00 +0000 (UTC) for IP:'10.11.54.4' DOMAIN:'int-mx04.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'thuth@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 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 19:20:05 -0000 On 22.06.2018 20:11, Eduardo Habkost wrote: > 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? The answer is (as almost always): Compatibility with migration. Nobody dares to sacrifice that chicken :-( Thomas