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

From: Paolo Bonzini
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 18:52:11 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

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.


> 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

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