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Re: [Qemu-devel] -cpu check, rdtscp and AMD KVM


From: Paolo Bonzini
Subject: Re: [Qemu-devel] -cpu check, rdtscp and AMD KVM
Date: Thu, 12 Nov 2015 16:58:37 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0


On 12/11/2015 16:25, Eduardo Habkost wrote:
> On Thu, Nov 12, 2015 at 11:53:44AM +0100, Paolo Bonzini wrote:
>> Eduardo,
>>
>> running QEMU 2.5 on SVM causes a warning because rdtscp is not supported
>> by KVM.  While I can fix it, that leaves a warning on all existing kernels.
> 
> You mean when using Opteron_G2 or newer, right? qemu64 and kvm64
> don't have rdtscp enabled.
> 
>> What do you think is the best way forward?
> 
> To simply remove rdtscp from all Opteron_G* models?

Not sure this is the right thing to do...  Real hardware has it, and
going forward KVM will provide it.

Paolo



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