linux-kernel - Re: [PATCH v2 1/3] KVM: x86: add support for user wait instructions

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Message-ID: <daf8ebd7-47bb-e4d8-fc67-38af8811000c@intel.com>
Date:   Wed, 29 May 2019 11:12:12 +0800
From:   Tao Xu <tao3.xu@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     rkrcmar@...hat.com, corbet@....net, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        sean.j.christopherson@...el.com, x86@...nel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, jingqi.liu@...el.com
Subject: Re: [PATCH v2 1/3] KVM: x86: add support for user wait instructions

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.