From: "Roedel, Joerg" <Joerg.Roedel@amd.com>
To: Alexander Graf <agraf@suse.de>
Cc: Avi Kivity <avi@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [PATCH 3/3] Add svm cpuid features
Date: Thu, 16 Sep 2010 16:35:50 +0200 [thread overview]
Message-ID: <20100916143549.GD7972@amd.com> (raw)
In-Reply-To: <4C922971.2020408@suse.de>
On Thu, Sep 16, 2010 at 10:28:01AM -0400, Alexander Graf wrote:
> Roedel, Joerg wrote:
> > I'll remove it then. It would have been nice to have it there because it
> > will improve performance of svm emulation. But if it is about emulating
> > the real cpu then I'll just drop it.
>
> speed == -cpu host :). If the performance increase is significant, we
> can always add a new cpu type for a cpu that does support those flags so
> people can use it there and still be migration safe. In fact, that would
> even benefit you guys as you'd sell more new machines for speed ;).
Well, since its emulated completly in software it would be available on
all hosts that start with -cpu phenom (at least if they use the same kvm
version). So this would not break migration.
Joerg
--
AMD Operating System Research Center
Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632
WARNING: multiple messages have this Message-ID (diff)
From: "Roedel, Joerg" <Joerg.Roedel@amd.com>
To: Alexander Graf <agraf@suse.de>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
Avi Kivity <avi@redhat.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: [Qemu-devel] Re: [PATCH 3/3] Add svm cpuid features
Date: Thu, 16 Sep 2010 16:35:50 +0200 [thread overview]
Message-ID: <20100916143549.GD7972@amd.com> (raw)
In-Reply-To: <4C922971.2020408@suse.de>
On Thu, Sep 16, 2010 at 10:28:01AM -0400, Alexander Graf wrote:
> Roedel, Joerg wrote:
> > I'll remove it then. It would have been nice to have it there because it
> > will improve performance of svm emulation. But if it is about emulating
> > the real cpu then I'll just drop it.
>
> speed == -cpu host :). If the performance increase is significant, we
> can always add a new cpu type for a cpu that does support those flags so
> people can use it there and still be migration safe. In fact, that would
> even benefit you guys as you'd sell more new machines for speed ;).
Well, since its emulated completly in software it would be available on
all hosts that start with -cpu phenom (at least if they use the same kvm
version). So this would not break migration.
Joerg
--
AMD Operating System Research Center
Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632
next prev parent reply other threads:[~2010-09-16 14:38 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-14 15:52 [PATCH 0/3] SVM feature support for qemu Joerg Roedel
2010-09-14 15:52 ` [Qemu-devel] " Joerg Roedel
2010-09-14 15:52 ` [PATCH 1/3] Make kvm64 the default cpu model when kvm_enabled() Joerg Roedel
2010-09-14 15:52 ` [Qemu-devel] " Joerg Roedel
2010-09-14 15:58 ` Alexander Graf
2010-09-14 15:58 ` [Qemu-devel] " Alexander Graf
2010-09-14 16:21 ` Roedel, Joerg
2010-09-14 16:21 ` [Qemu-devel] " Roedel, Joerg
2010-09-16 14:03 ` Avi Kivity
2010-09-16 14:03 ` [Qemu-devel] " Avi Kivity
2010-09-16 14:21 ` Roedel, Joerg
2010-09-16 14:21 ` [Qemu-devel] " Roedel, Joerg
2010-09-16 14:22 ` Avi Kivity
2010-09-16 14:22 ` [Qemu-devel] " Avi Kivity
2010-09-14 15:52 ` [PATCH 2/3] Set cpuid definition to 0 before initializing it Joerg Roedel
2010-09-14 15:52 ` [Qemu-devel] " Joerg Roedel
2010-09-14 15:52 ` [PATCH 3/3] Add svm cpuid features Joerg Roedel
2010-09-14 15:52 ` [Qemu-devel] " Joerg Roedel
2010-09-16 14:06 ` Avi Kivity
2010-09-16 14:06 ` [Qemu-devel] " Avi Kivity
2010-09-16 14:12 ` Roedel, Joerg
2010-09-16 14:12 ` [Qemu-devel] " Roedel, Joerg
2010-09-16 14:17 ` Alexander Graf
2010-09-16 14:17 ` [Qemu-devel] " Alexander Graf
2010-09-16 14:26 ` Roedel, Joerg
2010-09-16 14:26 ` [Qemu-devel] " Roedel, Joerg
2010-09-16 14:28 ` Alexander Graf
2010-09-16 14:28 ` [Qemu-devel] " Alexander Graf
2010-09-16 14:35 ` Roedel, Joerg [this message]
2010-09-16 14:35 ` Roedel, Joerg
2010-09-14 20:27 ` [Qemu-devel] [PATCH 0/3] SVM feature support for qemu Alexander Graf
2010-09-14 20:27 ` Alexander Graf
-- strict thread matches above, loose matches on Subject: below --
2010-09-27 13:16 [PATCH 0/3] SVM feature support for qemu v3 Joerg Roedel
2010-09-27 13:16 ` [PATCH 3/3] Add svm cpuid features Joerg Roedel
2010-09-27 14:58 ` Avi Kivity
2010-09-27 15:02 ` Avi Kivity
2010-09-27 15:40 ` Roedel, Joerg
2010-09-27 16:22 ` Avi Kivity
2010-09-28 9:28 ` Roedel, Joerg
2010-09-28 9:37 ` Avi Kivity
2010-09-28 10:05 ` Roedel, Joerg
2010-09-28 10:16 ` Avi Kivity
2010-10-06 18:57 ` Marcelo Tosatti
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