linux-kernel - Re: [PATCH v5 09/26] KVM: VMX: nVMX: Support TSC scaling and PERF_GLOBAL

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Date:   Thu, 18 Aug 2022 17:19:57 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 09/26] KVM: VMX: nVMX: Support TSC scaling and
 PERF_GLOBAL_CTRL with enlightened VMCS

On Tue, Aug 02, 2022, Vitaly Kuznetsov wrote:
> diff --git a/arch/x86/kvm/vmx/evmcs.h b/arch/x86/kvm/vmx/evmcs.h
> index f886a8ff0342..4b809c79ae63 100644
> --- a/arch/x86/kvm/vmx/evmcs.h
> +++ b/arch/x86/kvm/vmx/evmcs.h
> @@ -37,16 +37,9 @@ DECLARE_STATIC_KEY_FALSE(enable_evmcs);
>   *	EPTP_LIST_ADDRESS               = 0x00002024,
>   *	VMREAD_BITMAP                   = 0x00002026,
>   *	VMWRITE_BITMAP                  = 0x00002028,
> - *
> - *	TSC_MULTIPLIER                  = 0x00002032,
>   *	PLE_GAP                         = 0x00004020,
>   *	PLE_WINDOW                      = 0x00004022,
>   *	VMX_PREEMPTION_TIMER_VALUE      = 0x0000482E,
> - *      GUEST_IA32_PERF_GLOBAL_CTRL     = 0x00002808,
> - *      HOST_IA32_PERF_GLOBAL_CTRL      = 0x00002c04,
> - *
> - * Currently unsupported in KVM:
> - *	GUEST_IA32_RTIT_CTL		= 0x00002814,

Almost forgot: is deleting this chunk of the comment intentional?

>   */
>  #define EVMCS1_UNSUPPORTED_PINCTRL (PIN_BASED_POSTED_INTR | \
>  				    PIN_BASED_VMX_PREEMPTION_TIMER)