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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Thu, 31 Mar 2016 18:52:11 +0200
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Subject: Re: [Qemu-devel] [Qemu-stable] [PATCH] target-i386: do not
 read/write MSR_TSC_AUX from KVM if CPUID bit is not set
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To: Peter Lieven <pl@kamp.de>
Cc: qemu-devel@nongnu.org, Laszlo Ersek <lersek@redhat.com>, Michael Roth <mdroth@linux.vnet.ibm.com>, ehabkost@redhat.com, qemu-stable@nongnu.org



On 31/03/2016 17:38, Peter Lieven wrote:
> 
> 
>> Am 31.03.2016 um 15:23 schrieb Paolo Bonzini <pbonzini@redhat.com>:
>>
>>
>>
>>> On 31/03/2016 15:12, Peter Lieven wrote:
>>>>>
>>>>> KVM does not let you read or write this MSR if the corresponding CPUID
>>>>> bit is not set.  This in turn causes MSRs that come after MSR_TSC_AUX
>>>>> to be ignored by KVM_SET_MRSS.
>>>
>>> Is it possible that this causes a freeze when migrating vom qemu 2.2.0
>>> to 2.5.1?
>>
>> I wouldn't exclude it if the CPU model is Westmere or earlier.
> 
> the Host CPU or the Emulated CPU?

The guest.

Paolo

> We emulate Westmere and have also some old blades with Westmere CPUs.
> 
> anyway, i give this a try.
> 
> Michael, this should have gone into 2.5.1 i think...
> 
> Thanks,
> Peter
> 
>