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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 17:38:17 +0200

> 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?

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...


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