linux-kernel - Re: [PATCH v2 3/3] KVM: vmx: handle vm-exit for UMWAIT and TPAUSE

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Message-ID: <f74f9223-cc6d-1f14-33a8-668aac415063@redhat.com>
Date:   Wed, 29 May 2019 04:39:16 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Tao Xu <tao3.xu@...el.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 3/3] KVM: vmx: handle vm-exit for UMWAIT and TPAUSE

On 29/05/19 04:25, Tao Xu wrote:
>>
> OK, but should we just drop this patch?
> Or add the VMX_EXIT_REASONS bits of UMWAIT and TPAUSE and handle like
> XSAVES/XRSTORS:
> "kvm_skip_emulated_instruction(vcpu);"
> "WARN(1, "this should never happen\n");"

Yes, this sounds good to me.

Paolo