From: "Andreas Färber" <afaerber@suse.de> To: Jan Kiszka <jan.kiszka@siemens.com> Cc: Anthony Liguori <anthony@codemonkey.ws>, 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>, Avi Kivity <avi@redhat.com>, Cole Robinson <crobinso@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Bruce Rogers <brogers@suse.com> Subject: Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it Date: Mon, 01 Oct 2012 18:43:00 +0200 [thread overview] Message-ID: <5069C814.7010201@suse.de> (raw) In-Reply-To: <5069A9DF.4040606@siemens.com> 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? Would be nice to at least amend the commit message with how they are expected to remedy that via command line. -machine accel=tcg? Regards, Andreas > > Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> > --- > kvm-all.c | 1 + > kvm-stub.c | 1 + > kvm.h | 1 + > vl.c | 4 ++-- > 4 files changed, 5 insertions(+), 2 deletions(-) > > diff --git a/kvm-all.c b/kvm-all.c > index 92a7137..4d5f86c 100644 > --- a/kvm-all.c > +++ b/kvm-all.c > @@ -103,6 +103,7 @@ struct KVMState > #endif > }; > > +bool kvm_configured = true; > KVMState *kvm_state; > bool kvm_kernel_irqchip; > bool kvm_async_interrupts_allowed; > diff --git a/kvm-stub.c b/kvm-stub.c > index 3c52eb5..86a6451 100644 > --- a/kvm-stub.c > +++ b/kvm-stub.c > @@ -17,6 +17,7 @@ > #include "gdbstub.h" > #include "kvm.h" > > +bool kvm_configured; > KVMState *kvm_state; > bool kvm_kernel_irqchip; > bool kvm_async_interrupts_allowed; > diff --git a/kvm.h b/kvm.h > index dea2998..9936e5f 100644 > --- a/kvm.h > +++ b/kvm.h > @@ -22,6 +22,7 @@ > #include <linux/kvm.h> > #endif > > +extern bool kvm_configured; > extern int kvm_allowed; > extern bool kvm_kernel_irqchip; > extern bool kvm_async_interrupts_allowed; > diff --git a/vl.c b/vl.c > index 8d305ca..f557bd1 100644 > --- a/vl.c > +++ b/vl.c > @@ -2215,8 +2215,8 @@ static int configure_accelerator(void) > } > > if (p == NULL) { > - /* Use the default "accelerator", tcg */ > - p = "tcg"; > + /* The default accelerator depends on the availability of KVM. */ > + p = kvm_configured ? "kvm" : "tcg"; > } > > while (!accel_initialised && *p != '\0') { > -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
WARNING: multiple messages have this Message-ID (diff)
From: "Andreas Färber" <afaerber@suse.de> To: Jan Kiszka <jan.kiszka@siemens.com> Cc: 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, 01 Oct 2012 18:43:00 +0200 [thread overview] Message-ID: <5069C814.7010201@suse.de> (raw) In-Reply-To: <5069A9DF.4040606@siemens.com> 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? Would be nice to at least amend the commit message with how they are expected to remedy that via command line. -machine accel=tcg? Regards, Andreas > > Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> > --- > kvm-all.c | 1 + > kvm-stub.c | 1 + > kvm.h | 1 + > vl.c | 4 ++-- > 4 files changed, 5 insertions(+), 2 deletions(-) > > diff --git a/kvm-all.c b/kvm-all.c > index 92a7137..4d5f86c 100644 > --- a/kvm-all.c > +++ b/kvm-all.c > @@ -103,6 +103,7 @@ struct KVMState > #endif > }; > > +bool kvm_configured = true; > KVMState *kvm_state; > bool kvm_kernel_irqchip; > bool kvm_async_interrupts_allowed; > diff --git a/kvm-stub.c b/kvm-stub.c > index 3c52eb5..86a6451 100644 > --- a/kvm-stub.c > +++ b/kvm-stub.c > @@ -17,6 +17,7 @@ > #include "gdbstub.h" > #include "kvm.h" > > +bool kvm_configured; > KVMState *kvm_state; > bool kvm_kernel_irqchip; > bool kvm_async_interrupts_allowed; > diff --git a/kvm.h b/kvm.h > index dea2998..9936e5f 100644 > --- a/kvm.h > +++ b/kvm.h > @@ -22,6 +22,7 @@ > #include <linux/kvm.h> > #endif > > +extern bool kvm_configured; > extern int kvm_allowed; > extern bool kvm_kernel_irqchip; > extern bool kvm_async_interrupts_allowed; > diff --git a/vl.c b/vl.c > index 8d305ca..f557bd1 100644 > --- a/vl.c > +++ b/vl.c > @@ -2215,8 +2215,8 @@ static int configure_accelerator(void) > } > > if (p == NULL) { > - /* Use the default "accelerator", tcg */ > - p = "tcg"; > + /* The default accelerator depends on the availability of KVM. */ > + p = kvm_configured ? "kvm" : "tcg"; > } > > while (!accel_initialised && *p != '\0') { > -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
next prev parent reply other threads:[~2012-10-01 16:43 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 [this message] 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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