From: "Daniel P. Berrange" <berrange@redhat.com>
To: "Andreas Färber" <afaerber@suse.de>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, kvm <kvm@vger.kernel.org>,
Scott Moser <smoser@ubuntu.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Michael Tokarev <mjt@tls.msk.ru>,
qemu-devel <qemu-devel@nongnu.org>,
Bruce Rogers <brogers@suse.com>, Avi Kivity <avi@redhat.com>,
Anthony Liguori <anthony@codemonkey.ws>,
Cole Robinson <crobinso@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it
Date: Mon, 1 Oct 2012 17:47:30 +0100 [thread overview]
Message-ID: <20121001164730.GC15554@redhat.com> (raw)
In-Reply-To: <5069C814.7010201@suse.de>
On Mon, Oct 01, 2012 at 06:43:00PM +0200, Andreas Färber wrote:
> Hello Jan,
>
> Am 01.10.2012 16:34, schrieb Jan Kiszka:
> > If we built a target for a host that supports KVM in principle, set the
> > default accelerator to KVM as well. This also means the start of QEMU
> > will fail to start if KVM support turns out to be unavailable at
> > runtime.
>
> From a distro point of view this of course means that we will build
> against KVM and that the new KVM default will start to fail for users on
> very old hardware. Can't we do a runtime check to select the default?
NB, this is *not* only about old hardware. There are plenty of users who
use QEMU inside VMs. One very common usage I know of is image building
tools which are run inside Amazon VMs, using libguestfs & QEMU.
IMHO, default to KVM, fallback to TCG is the most friendly default
behaviour.
Daniel
--
|: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org -o- http://virt-manager.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
WARNING: multiple messages have this Message-ID (diff)
From: "Daniel P. Berrange" <berrange@redhat.com>
To: "Andreas Färber" <afaerber@suse.de>
Cc: kvm <kvm@vger.kernel.org>, Scott Moser <smoser@ubuntu.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Michael Tokarev <mjt@tls.msk.ru>,
qemu-devel <qemu-devel@nongnu.org>,
Bruce Rogers <brogers@suse.com>, Avi Kivity <avi@redhat.com>,
Anthony Liguori <anthony@codemonkey.ws>,
Cole Robinson <crobinso@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it
Date: Mon, 1 Oct 2012 17:47:30 +0100 [thread overview]
Message-ID: <20121001164730.GC15554@redhat.com> (raw)
In-Reply-To: <5069C814.7010201@suse.de>
On Mon, Oct 01, 2012 at 06:43:00PM +0200, Andreas Färber wrote:
> Hello Jan,
>
> Am 01.10.2012 16:34, schrieb Jan Kiszka:
> > If we built a target for a host that supports KVM in principle, set the
> > default accelerator to KVM as well. This also means the start of QEMU
> > will fail to start if KVM support turns out to be unavailable at
> > runtime.
>
> From a distro point of view this of course means that we will build
> against KVM and that the new KVM default will start to fail for users on
> very old hardware. Can't we do a runtime check to select the default?
NB, this is *not* only about old hardware. There are plenty of users who
use QEMU inside VMs. One very common usage I know of is image building
tools which are run inside Amazon VMs, using libguestfs & QEMU.
IMHO, default to KVM, fallback to TCG is the most friendly default
behaviour.
Daniel
--
|: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org -o- http://virt-manager.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
next prev parent reply other threads:[~2012-10-01 16:47 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-30 19:11 qemu-kvm: remove "boot=on|off" drive parameter compatibility Marcelo Tosatti
2012-10-01 1:02 ` Amos Kong
2012-10-01 8:05 ` Jan Kiszka
2012-10-01 9:31 ` Marcelo Tosatti
2012-10-01 10:21 ` Jan Kiszka
2012-10-01 13:03 ` Marcelo Tosatti
2012-10-01 13:14 ` Jan Kiszka
2012-10-01 13:19 ` Anthony Liguori
2012-10-01 13:19 ` [Qemu-devel] " Anthony Liguori
2012-10-01 13:26 ` Jan Kiszka
2012-10-01 13:26 ` [Qemu-devel] " Jan Kiszka
2012-10-03 9:55 ` Gleb Natapov
2012-10-03 9:55 ` Gleb Natapov
2012-10-03 10:06 ` Jan Kiszka
2012-10-03 10:06 ` Jan Kiszka
2012-10-03 10:11 ` Gleb Natapov
2012-10-03 10:11 ` Gleb Natapov
2012-10-03 10:57 ` Lucas Meneghel Rodrigues
2012-10-03 10:57 ` [Qemu-devel] " Lucas Meneghel Rodrigues
2012-10-03 13:19 ` Paolo Bonzini
2012-10-03 13:19 ` [Qemu-devel] " Paolo Bonzini
2012-10-03 13:27 ` Gleb Natapov
2012-10-03 13:27 ` [Qemu-devel] " Gleb Natapov
2012-10-04 10:48 ` Jan Kiszka
2012-10-04 10:48 ` [Qemu-devel] " Jan Kiszka
2012-10-04 12:10 ` Lucas Meneghel Rodrigues
2012-10-04 12:10 ` [Qemu-devel] " Lucas Meneghel Rodrigues
2012-10-04 12:27 ` Jan Kiszka
2012-10-04 12:27 ` [Qemu-devel] " Jan Kiszka
2012-10-04 17:21 ` Lucas Meneghel Rodrigues
2012-10-04 17:21 ` [Qemu-devel] " Lucas Meneghel Rodrigues
2012-10-04 17:24 ` Jan Kiszka
2012-10-04 17:24 ` [Qemu-devel] " Jan Kiszka
2012-10-01 13:31 ` Marcelo Tosatti
2012-10-01 13:31 ` [Qemu-devel] " Marcelo Tosatti
2012-10-01 13:36 ` Jan Kiszka
2012-10-01 13:36 ` [Qemu-devel] " Jan Kiszka
2012-10-01 13:44 ` Michael Tokarev
2012-10-01 13:44 ` [Qemu-devel] " Michael Tokarev
2012-10-01 13:48 ` Jan Kiszka
2012-10-01 13:48 ` [Qemu-devel] " Jan Kiszka
2012-10-01 13:38 ` Paolo Bonzini
2012-10-01 13:38 ` [Qemu-devel] " Paolo Bonzini
2012-10-01 13:46 ` Jan Kiszka
2012-10-01 13:46 ` [Qemu-devel] " Jan Kiszka
2012-10-01 14:04 ` Anthony Liguori
2012-10-01 14:04 ` [Qemu-devel] " Anthony Liguori
2012-10-01 14:34 ` [PATCH] kvm: Set default accelerator to "kvm" if the host supports it Jan Kiszka
2012-10-01 14:34 ` [Qemu-devel] " Jan Kiszka
2012-10-01 16:20 ` Anthony Liguori
2012-10-01 16:20 ` [Qemu-devel] " Anthony Liguori
2012-10-01 16:56 ` Aurelien Jarno
2012-10-01 16:56 ` [Qemu-devel] " Aurelien Jarno
2012-10-03 9:02 ` Jan Kiszka
2012-10-03 9:02 ` [Qemu-devel] " Jan Kiszka
2012-10-03 20:01 ` Blue Swirl
2012-10-03 20:01 ` [Qemu-devel] " Blue Swirl
2012-10-03 20:26 ` Peter Maydell
2012-10-03 20:26 ` Peter Maydell
2012-10-05 1:15 ` Alexander Graf
2012-10-05 1:15 ` Alexander Graf
2012-10-05 2:17 ` Anthony Liguori
2012-10-05 2:17 ` [Qemu-devel] " Anthony Liguori
2012-10-05 2:24 ` Alexander Graf
2012-10-05 2:24 ` Alexander Graf
2012-10-05 8:15 ` Peter Maydell
2012-10-05 8:15 ` Peter Maydell
2012-10-08 14:03 ` Andreas Färber
2012-10-08 14:03 ` Andreas Färber
2012-10-08 14:08 ` Alexander Graf
2012-10-08 14:08 ` Alexander Graf
2012-10-01 16:43 ` Andreas Färber
2012-10-01 16:43 ` Andreas Färber
2012-10-01 16:47 ` Daniel P. Berrange [this message]
2012-10-01 16:47 ` Daniel P. Berrange
2012-10-01 19:03 ` Anthony Liguori
2012-10-01 19:03 ` Anthony Liguori
2012-10-01 19:25 ` Paolo Bonzini
2012-10-01 19:25 ` [Qemu-devel] " Paolo Bonzini
2012-10-01 20:07 ` Anthony Liguori
2012-10-01 20:07 ` Anthony Liguori
2012-10-02 7:46 ` Markus Armbruster
2012-10-02 7:46 ` [Qemu-devel] " Markus Armbruster
2012-10-02 8:15 ` Aurelien Jarno
2012-10-02 8:15 ` Aurelien Jarno
2012-10-03 6:58 ` Michael Tokarev
2012-10-03 6:58 ` Michael Tokarev
2012-10-03 9:05 ` Jan Kiszka
2012-10-03 9:05 ` [Qemu-devel] " Jan Kiszka
2012-10-01 14:07 ` qemu-kvm: remove "boot=on|off" drive parameter compatibility Alexander Graf
2012-10-01 14:07 ` [Qemu-devel] " Alexander Graf
2012-10-01 14:20 ` Paolo Bonzini
2012-10-01 14:20 ` [Qemu-devel] " Paolo Bonzini
2012-10-01 15:39 ` Bruce Rogers
2012-10-01 15:39 ` Bruce Rogers
2012-10-02 8:14 ` Daniel P. Berrange
2012-10-02 8:14 ` [Qemu-devel] " Daniel P. Berrange
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