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Re: [Qemu-devel] cpuid problem in upstream qemu with kvm
From: |
Gleb Natapov |
Subject: |
Re: [Qemu-devel] cpuid problem in upstream qemu with kvm |
Date: |
Sun, 20 Dec 2009 19:23:41 +0200 |
On Sun, Dec 20, 2009 at 07:18:22PM +0200, Michael S. Tsirkin wrote:
> On Sun, Dec 20, 2009 at 06:17:02PM +0100, Alexander Graf wrote:
> >
> > On 20.12.2009, at 17:56, Michael S. Tsirkin wrote:
> >
> > > On Sun, Dec 20, 2009 at 05:59:33PM +0200, Avi Kivity wrote:
> > >> On 12/20/2009 05:51 PM, Michael S. Tsirkin wrote:
> > >>>
> > >>>> Maybe we should make -cpu host the default. That will give the best
> > >>>> performance for casual users, more testing for newer features, and will
> > >>>> force management apps to treat migration much more seriously. The
> > >>>> downside is that casual users upgrading their machines might experience
> > >>>> issues with Windows. Feature compatibility is not just about
> > >>>> migration.
> > >>>>
> > >>> This seems very aggressive. Can't we whitelist features that we know
> > >>> about? Further, doesn't KVM already do this?
> > >>>
> > >>>
> > >>
> > >> It does, but without -cpuid host you're stuck with qemu64 (kvm.ko
> > >> doesn't add features userspace didn't request).
> > >
> > > Hmm, then, shouldn't either kvm or qemu mask features that we do not
> > > emulate well enough to make windows not crash?
> >
> > -cpu host does that already, no?
> >
> > Alex
>
> I expected so, but Avi here seems to say windows will crash if you
> use a new CPU with it ...
>
Windows _may_ crash if you'll _upgrade_ your _host_ CPU.
--
Gleb.
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, (continued)
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Michael S. Tsirkin, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Avi Kivity, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Michael S. Tsirkin, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Alexander Graf, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Michael S. Tsirkin, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Alexander Graf, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm,
Gleb Natapov <=
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Alexander Graf, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Gleb Natapov, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Anthony Liguori, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Alexander Graf, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Gleb Natapov, 2009/12/21
- [Qemu-devel] Re: cpuid problem in upstream qemu with kvm, Paolo Bonzini, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Michael S. Tsirkin, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Gleb Natapov, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Dor Laor, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, john cooper, 2009/12/21