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Subject: Re: [PATCH v2 3/3] KVM: vmx: handle vm-exit for UMWAIT and TPAUSE
To:     Tao Xu <tao3.xu@intel.com>, rkrcmar@redhat.com, corbet@lwn.net,
        tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
        sean.j.christopherson@intel.com
Cc:     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>
 <20190524075637.29496-4-tao3.xu@intel.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <b0958339-b23c-dd9d-8673-aae098769738@redhat.com>
Date:   Wed, 29 May 2019 03:28:19 +0200
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On 24/05/19 09:56, Tao Xu wrote:
> As the latest Intel 64 and IA-32 Architectures Software Developer's
> Manual, UMWAIT and TPAUSE instructions cause a VM exit if the
> “RDTSC exiting” and “enable user wait and pause” VM-execution controls
> are both 1.
> 
> This patch is to handle the vm-exit for UMWAIT and TPAUSE as invalid_op.

KVM never enables RDTSC exiting, so this is not necessary.

Paolo