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Re: [Qemu-devel] cpuid problem in upstream qemu with kvm
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] cpuid problem in upstream qemu with kvm |
Date: |
Sun, 20 Dec 2009 18:29:11 +0100 |
On 20.12.2009, at 18:23, Gleb Natapov wrote:
> 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.
Uh. It may lose activation I guess. But apart from that I can't see how it'd
break as long as you don't expect loadvm to work.
Anybody mind to go into a bit more detail here? :-)
Alex
- 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, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm,
Alexander Graf <=
- 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
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Dor Laor, 2009/12/22