linux-kernel - Re: [PATCH v11 12/23] KVM: VMX: Introduce CET VMCS fields and control bits

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Message-ID: <b63275a2-8d7e-4e45-ae4b-f69e90644fe5@zytor.com>
Date: Mon, 28 Jul 2025 15:53:14 -0700
From: Xin Li <xin@...or.com>
To: Chao Gao <chao.gao@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org, seanjc@...gle.com,
        pbonzini@...hat.com, dave.hansen@...el.com
Cc: rick.p.edgecombe@...el.com, mlevitsk@...hat.com, john.allen@....com,
        weijiang.yang@...el.com, minipli@...ecurity.net,
        Zhang Yi Z <yi.z.zhang@...ux.intel.com>,
        Thomas Gleixner
 <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v11 12/23] KVM: VMX: Introduce CET VMCS fields and control
 bits

On 7/4/2025 1:49 AM, Chao Gao wrote:
> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
> index cca7d6641287..ce10a7e2d3d9 100644
> --- a/arch/x86/include/asm/vmx.h
> +++ b/arch/x86/include/asm/vmx.h
> @@ -106,6 +106,7 @@
>   #define VM_EXIT_CLEAR_BNDCFGS                   0x00800000
>   #define VM_EXIT_PT_CONCEAL_PIP			0x01000000
>   #define VM_EXIT_CLEAR_IA32_RTIT_CTL		0x02000000
> +#define VM_EXIT_LOAD_CET_STATE                  0x10000000
>   
>   #define VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR	0x00036dff
>   
> @@ -119,6 +120,7 @@
>   #define VM_ENTRY_LOAD_BNDCFGS                   0x00010000
>   #define VM_ENTRY_PT_CONCEAL_PIP			0x00020000
>   #define VM_ENTRY_LOAD_IA32_RTIT_CTL		0x00040000
> +#define VM_ENTRY_LOAD_CET_STATE                 0x00100000
>   
>   #define VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR	0x000011ff
>   
> @@ -369,6 +371,9 @@ enum vmcs_field {
>   	GUEST_PENDING_DBG_EXCEPTIONS    = 0x00006822,
>   	GUEST_SYSENTER_ESP              = 0x00006824,
>   	GUEST_SYSENTER_EIP              = 0x00006826,
> +	GUEST_S_CET                     = 0x00006828,
> +	GUEST_SSP                       = 0x0000682a,
> +	GUEST_INTR_SSP_TABLE            = 0x0000682c,
>   	HOST_CR0                        = 0x00006c00,
>   	HOST_CR3                        = 0x00006c02,
>   	HOST_CR4                        = 0x00006c04,
> @@ -381,6 +386,9 @@ enum vmcs_field {
>   	HOST_IA32_SYSENTER_EIP          = 0x00006c12,
>   	HOST_RSP                        = 0x00006c14,
>   	HOST_RIP                        = 0x00006c16,
> +	HOST_S_CET                      = 0x00006c18,
> +	HOST_SSP                        = 0x00006c1a,
> +	HOST_INTR_SSP_TABLE             = 0x00006c1c
>   };
>   
>   /*

A comment not on this patch itself.

Both spaces and tabs are currently used to align columns in 
arch/x86/include/asm/vmx.h.  Can we standardize on one, either spaces or 
tabs?

Thanks!
     Xin