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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 18:23:27 +0100 |
On 20.12.2009, at 18:18, 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 ...
Avi, have you narrowed it down to a specific feature bit?
Alex
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, (continued)
- 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, Gleb Natapov, 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, 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, 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 <=
- 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, 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