From: Peter Maydell <peter.maydell@linaro.org>
To: Alexander Graf <agraf@suse.de>
Cc: "Anthony Liguori" <anthony@codemonkey.ws>,
"Blue Swirl" <blauwirbel@gmail.com>, 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: Fri, 5 Oct 2012 09:15:42 +0100 [thread overview]
Message-ID: <CAFEAcA8y0v4Ro1amw+LxH6sZMY5QW=cSzAM7S4hBhoXeftFq+Q@mail.gmail.com> (raw)
In-Reply-To: <9F3F356B-1A5A-44A8-A9D4-9CE9E4C61A8F@suse.de>
On 5 October 2012 03:24, Alexander Graf <agraf@suse.de> wrote:
> On 05.10.2012, at 04:17, Anthony Liguori wrote:
>> Alexander Graf <agraf@suse.de> writes:
>>> We get similar problems on PPC. Take the following example:
>>>
>>> $ qemu-system-ppc -M mpc8544ds -kernel uImage -nographic
>>
>> But do you really expect people to do this? I have to believe that
>> people running on PPC hardware and running qemu-system-ppc most likely
>> want to do KVM...
>
> Sure. But we wouldn't be able to even tell them what went wrong,
> as we don't have a negotiation mechanism right now that could tell
> user space "hey, the CPU you selected is unknown to me".
On ARM we will at least be able to say what happened, because
our kvm_arch_init_vcpu() will fail (when we try the ioctl to
tell the kernel "be this kind of CPU") and we can print a
message there. However QEMU as a whole doesn't have any way of
falling back to TCG at that point so it just bails out.
-- PMM
WARNING: multiple messages have this Message-ID (diff)
From: Peter Maydell <peter.maydell@linaro.org>
To: Alexander Graf <agraf@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>,
"Blue Swirl" <blauwirbel@gmail.com>,
"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: Fri, 5 Oct 2012 09:15:42 +0100 [thread overview]
Message-ID: <CAFEAcA8y0v4Ro1amw+LxH6sZMY5QW=cSzAM7S4hBhoXeftFq+Q@mail.gmail.com> (raw)
In-Reply-To: <9F3F356B-1A5A-44A8-A9D4-9CE9E4C61A8F@suse.de>
On 5 October 2012 03:24, Alexander Graf <agraf@suse.de> wrote:
> On 05.10.2012, at 04:17, Anthony Liguori wrote:
>> Alexander Graf <agraf@suse.de> writes:
>>> We get similar problems on PPC. Take the following example:
>>>
>>> $ qemu-system-ppc -M mpc8544ds -kernel uImage -nographic
>>
>> But do you really expect people to do this? I have to believe that
>> people running on PPC hardware and running qemu-system-ppc most likely
>> want to do KVM...
>
> Sure. But we wouldn't be able to even tell them what went wrong,
> as we don't have a negotiation mechanism right now that could tell
> user space "hey, the CPU you selected is unknown to me".
On ARM we will at least be able to say what happened, because
our kvm_arch_init_vcpu() will fail (when we try the ioctl to
tell the kernel "be this kind of CPU") and we can print a
message there. However QEMU as a whole doesn't have any way of
falling back to TCG at that point so it just bails out.
-- PMM
next prev parent reply other threads:[~2012-10-05 8:15 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 [this message]
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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