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Subject: Re: [RFC PATCH v2 54/69] KVM: VMX: Define VMCS encodings for shared
 EPT pointer
To:     isaku.yamahata@intel.com, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H . Peter Anvin" <hpa@zytor.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>, erdemaktas@google.com,
        Connor Kuehl <ckuehl@redhat.com>,
        Sean Christopherson <seanjc@google.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc:     isaku.yamahata@gmail.com,
        Sean Christopherson <sean.j.christopherson@intel.com>
References: <cover.1625186503.git.isaku.yamahata@intel.com>
 <9d24d2d63de110962f85f66ce84250967436f96b.1625186503.git.isaku.yamahata@intel.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <56866301-e218-fee4-1b79-2249db5a3bed@redhat.com>
Date:   Tue, 6 Jul 2021 16:42:32 +0200
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On 03/07/21 00:05, isaku.yamahata@intel.com wrote:
> From: Sean Christopherson <sean.j.christopherson@intel.com>
> 
> Add the VMCS field encoding for the shared EPTP, which will be used by
> TDX to have separate EPT walks for private GPAs (existing EPTP) versus
> shared GPAs (new shared EPTP).
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
> ---
>   arch/x86/include/asm/vmx.h | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
> index 132981276a2f..56b3d32941fd 100644
> --- a/arch/x86/include/asm/vmx.h
> +++ b/arch/x86/include/asm/vmx.h
> @@ -235,6 +235,8 @@ enum vmcs_field {
>   	ENCLS_EXITING_BITMAP_HIGH	= 0x0000202F,
>   	TSC_MULTIPLIER                  = 0x00002032,
>   	TSC_MULTIPLIER_HIGH             = 0x00002033,
> +	SHARED_EPT_POINTER		= 0x0000203C,
> +	SHARED_EPT_POINTER_HIGH		= 0x0000203D,
>   	GUEST_PHYSICAL_ADDRESS          = 0x00002400,
>   	GUEST_PHYSICAL_ADDRESS_HIGH     = 0x00002401,
>   	VMCS_LINK_POINTER               = 0x00002800,
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>