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Re: [Qemu-devel] [PATCH v4 1/3] target-i386: KVM: add basic Intel LMCE s

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v4 1/3] target-i386: KVM: add basic Intel LMCE support
Date: Thu, 16 Jun 2016 12:42:19 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0

On 16/06/2016 12:34, Haozhong Zhang wrote:
> On 06/16/16 12:23, Paolo Bonzini wrote:
>> On 16/06/2016 12:16, Haozhong Zhang wrote:
>>>>> +        has_msr_mcg_ext_ctl = true;
>>>>>      }
>>>>>      c = cpuid_find_entry(&cpuid_data.cpuid, 0x80000007, 0);
>>>> Which silicon has LMCE?  We may want to enable the property for some CPU
>>>> models.  Apart from this, the patch is pretty much okay.
>>> Skylake-EX
>> ... However, all virtual CPUs can use LMCE because the rendez-vous is
>> done in the host.  Is this correct?
> Yes, if it does not confuse the guest which sees LMCE available on
> lower end or earlier CPUs (though I think someone would feel
> happy).

Yes, that's what I expect too.  No confusion, and some happiness. :)

> Or do we add it only to qemu64 and kvm64?

I'm not sure where to add it, actually. :(  Let's wait for Eduardo's


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