linux-kernel - Re: [RFC PATCH v2 54/69] KVM: VMX: Define VMCS encodings for shared EPT pointer

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Date:   Tue, 6 Jul 2021 16:42:32 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     isaku.yamahata@...el.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     isaku.yamahata@...il.com,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [RFC PATCH v2 54/69] KVM: VMX: Define VMCS encodings for shared
 EPT pointer

On 03/07/21 00:05, isaku.yamahata@...el.com wrote:
> From: Sean Christopherson <sean.j.christopherson@...el.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@...el.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.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@...hat.com>