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Date:   Wed, 29 May 2019 10:25:14 +0800
From:   Tao Xu <>
To:     Paolo Bonzini <>
Subject: Re: [PATCH v2 3/3] KVM: vmx: handle vm-exit for UMWAIT and TPAUSE

On 29/05/2019 09:28, Paolo Bonzini wrote:
> 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
OK, but should we just drop this patch?
Or add the VMX_EXIT_REASONS bits of UMWAIT and TPAUSE and handle like 
"WARN(1, "this should never happen\n");"

Looking forward to your reply.


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