From: Peter Maydell <peter.maydell@linaro.org> To: Blue Swirl <blauwirbel@gmail.com> Cc: "Anthony Liguori" <anthony@codemonkey.ws>, 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>, "Avi Kivity" <avi@redhat.com>, "Cole Robinson" <crobinso@redhat.com>, "Paolo Bonzini" <pbonzini@redhat.com>, "Andreas Färber" <afaerber@suse.de>, "Aurelien Jarno" <aurelien@aurel32.net> Subject: Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it Date: Wed, 3 Oct 2012 21:26:27 +0100 [thread overview] Message-ID: <CAFEAcA8red0vEQpbV2onWNcdO+rhL1PJD5O0aBrDeG2Mb7ULpw@mail.gmail.com> (raw) In-Reply-To: <CAAu8pHuaGAsb22_rCBK0WCh+osWGBojmMtf16kDvbvk2B0f1XA@mail.gmail.com> On 3 October 2012 21:01, Blue Swirl <blauwirbel@gmail.com> wrote: > On Mon, Oct 1, 2012 at 4:20 PM, Anthony Liguori <anthony@codemonkey.ws> wrote: >> Jan Kiszka <jan.kiszka@siemens.com> writes: >>> + /* The default accelerator depends on the availability of KVM. */ >>> + p = kvm_configured ? "kvm" : "tcg"; >>> } >> Blue/Aurelien, any objections? > > No, maybe a message could be printed that says that the default has > changed, for a few releases. I've lost track of the conversation, are we currently proposing the accelerator default to be "kvm" (as per the original patch you quote here) or "kvm:tcg" ? I'm not entirely sure which I prefer from an ARM perspective For some time to come and for a lot of targets (ie any target CPU except A15), having a default of "kvm" is going to cause existing working commandlines to stop working. [I expect that ARM-host qemu binaries will be built with CONFIG_KVM once ARM KVM support lands, but the same binary will be run on hosts without virtualization extensions.] On the other hand, perhaps there just aren't really very many people who run QEMU on ARM hosts, and so we can ignore them :-) -- PMM
WARNING: multiple messages have this Message-ID (diff)
From: Peter Maydell <peter.maydell@linaro.org> To: Blue Swirl <blauwirbel@gmail.com> 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>, "Avi Kivity" <avi@redhat.com>, "Anthony Liguori" <anthony@codemonkey.ws>, "Cole Robinson" <crobinso@redhat.com>, "Paolo Bonzini" <pbonzini@redhat.com>, "Andreas Färber" <afaerber@suse.de>, "Aurelien Jarno" <aurelien@aurel32.net> Subject: Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it Date: Wed, 3 Oct 2012 21:26:27 +0100 [thread overview] Message-ID: <CAFEAcA8red0vEQpbV2onWNcdO+rhL1PJD5O0aBrDeG2Mb7ULpw@mail.gmail.com> (raw) In-Reply-To: <CAAu8pHuaGAsb22_rCBK0WCh+osWGBojmMtf16kDvbvk2B0f1XA@mail.gmail.com> On 3 October 2012 21:01, Blue Swirl <blauwirbel@gmail.com> wrote: > On Mon, Oct 1, 2012 at 4:20 PM, Anthony Liguori <anthony@codemonkey.ws> wrote: >> Jan Kiszka <jan.kiszka@siemens.com> writes: >>> + /* The default accelerator depends on the availability of KVM. */ >>> + p = kvm_configured ? "kvm" : "tcg"; >>> } >> Blue/Aurelien, any objections? > > No, maybe a message could be printed that says that the default has > changed, for a few releases. I've lost track of the conversation, are we currently proposing the accelerator default to be "kvm" (as per the original patch you quote here) or "kvm:tcg" ? I'm not entirely sure which I prefer from an ARM perspective For some time to come and for a lot of targets (ie any target CPU except A15), having a default of "kvm" is going to cause existing working commandlines to stop working. [I expect that ARM-host qemu binaries will be built with CONFIG_KVM once ARM KVM support lands, but the same binary will be run on hosts without virtualization extensions.] On the other hand, perhaps there just aren't really very many people who run QEMU on ARM hosts, and so we can ignore them :-) -- PMM
next prev parent reply other threads:[~2012-10-03 20:26 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 [this message] 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 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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