linux-kernel - Re: [RFC PATCH v2 03/69] KVM: X86: move out the definition vmcs

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Date:   Tue, 6 Jul 2021 14:33:43 +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
Subject: Re: [RFC PATCH v2 03/69] KVM: X86: move out the definition
 vmcs_hdr/vmcs from kvm to x86

On 03/07/21 00:04, isaku.yamahata@...el.com wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
> 
> This is preparation for TDX support.
> 
> Because SEAMCALL instruction requires VMX enabled, it needs to initialize
> struct vmcs and load it before SEAMCALL instruction.[1] [2]  Move out the
> definition of vmcs into a common x86 header, arch/x86/include/asm/vmx.h, so
> that seamloader code can share the same definition.
> 
> [1] Intel Trust Domain CPU Architectural Extensions
> https://software.intel.com/content/dam/develop/external/us/en/documents/intel-tdx-cpu-architectural-specification.pdf
> 
> [2] TDX Module spec
> https://software.intel.com/content/dam/develop/external/us/en/documents/tdx-module-1eas-v0.85.039.pdf
> 
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> ---
>   arch/x86/include/asm/vmx.h | 11 +++++++++++
>   arch/x86/kvm/vmx/vmcs.h    | 11 -----------
>   2 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
> index 0ffaa3156a4e..035dfdafa2c1 100644
> --- a/arch/x86/include/asm/vmx.h
> +++ b/arch/x86/include/asm/vmx.h
> @@ -17,6 +17,17 @@
>   #include <uapi/asm/vmx.h>
>   #include <asm/vmxfeatures.h>
>   
> +struct vmcs_hdr {
> +	u32 revision_id:31;
> +	u32 shadow_vmcs:1;
> +};
> +
> +struct vmcs {
> +	struct vmcs_hdr hdr;
> +	u32 abort;
> +	char data[];
> +};
> +
>   #define VMCS_CONTROL_BIT(x)	BIT(VMX_FEATURE_##x & 0x1f)
>   
>   /*
> diff --git a/arch/x86/kvm/vmx/vmcs.h b/arch/x86/kvm/vmx/vmcs.h
> index 1472c6c376f7..ac09bc4996a5 100644
> --- a/arch/x86/kvm/vmx/vmcs.h
> +++ b/arch/x86/kvm/vmx/vmcs.h
> @@ -11,17 +11,6 @@
>   
>   #include "capabilities.h"
>   
> -struct vmcs_hdr {
> -	u32 revision_id:31;
> -	u32 shadow_vmcs:1;
> -};
> -
> -struct vmcs {
> -	struct vmcs_hdr hdr;
> -	u32 abort;
> -	char data[];
> -};
> -
>   DECLARE_PER_CPU(struct vmcs *, current_vmcs);
>   
>   /*
> 

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