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Subject: Re: [PATCH v2 1/3] KVM: x86: add support for user wait instructions
To:     Paolo Bonzini <pbonzini@redhat.com>
Cc:     rkrcmar@redhat.com, corbet@lwn.net, tglx@linutronix.de,
        mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
        sean.j.christopherson@intel.com, x86@kernel.org,
        kvm@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, jingqi.liu@intel.com
References: <20190524075637.29496-1-tao3.xu@intel.com>
 <20190524075637.29496-2-tao3.xu@intel.com>
 <419f62f3-69a8-7ec0-5eeb-20bed69925f2@redhat.com>
 <c1b27714-2eb8-055e-f26c-e17787d83bb6@intel.com>
 <b5daf72d-d764-baa4-8e7f-b09dff417786@redhat.com>
From:   Tao Xu <tao3.xu@intel.com>
Message-ID: <daf8ebd7-47bb-e4d8-fc67-38af8811000c@intel.com>
Date:   Wed, 29 May 2019 11:12:12 +0800
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On 5/29/2019 10:38 AM, Paolo Bonzini wrote:
> On 29/05/19 04:05, Tao Xu wrote:
>>>
>>
>> Thank you Paolo, but I have another question. I was wondering if it is
>> appropriate to enable X86_FEATURE_WAITPKG when QEMU uses "-overcommit
>> cpu-pm=on"?
> 
> "-overcommit" only establishes the behavior of KVM, it doesn't change
> the cpuid bits.  So you'd need "-cpu" as well.
> 
> Paolo
> 
OK I got it. Thank you for your review.