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Re: [Qemu-devel] [Qemu-stable] [PATCH] target-i386: do not read/write MS

From: Peter Lieven
Subject: Re: [Qemu-devel] [Qemu-stable] [PATCH] target-i386: do not read/write MSR_TSC_AUX from KVM if CPUID bit is not set
Date: Thu, 31 Mar 2016 21:21:51 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

Am 31.03.2016 um 18:52 schrieb Paolo Bonzini:
> On 31/03/2016 17:38, Peter Lieven wrote:
>>> Am 31.03.2016 um 15:23 schrieb Paolo Bonzini <address@hidden>:
>>>> 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.

I can confirm this seems to fix the migration for emulated Westmere CPUs. 
Regardless if its a 2.2.0 -> 2.5.1 or 2.5.1 -> 2.5.1


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