linux-kernel - Re: [PATCH v6 7/9] KVM VMX: Move MSR_IA32_VMX

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Message-ID: <ZfRsoQQFWqSxJIfs@intel.com>
Date: Fri, 15 Mar 2024 23:43:29 +0800
From: Zhao Liu <zhao1.liu@...el.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	Paolo Bonzini <pbonzini@...hat.com>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Shan Kang <shan.kang@...el.com>,
	Kai Huang <kai.huang@...el.com>, Xin Li <xin3.li@...el.com>
Subject: Re: [PATCH v6 7/9] KVM VMX: Move MSR_IA32_VMX_MISC bit defines to
 asm/vmx.h

On Fri, Mar 08, 2024 at 05:27:23PM -0800, Sean Christopherson wrote:
> Date: Fri,  8 Mar 2024 17:27:23 -0800
> From: Sean Christopherson <seanjc@...gle.com>
> Subject: [PATCH v6 7/9] KVM VMX: Move MSR_IA32_VMX_MISC bit defines to
>  asm/vmx.h
> X-Mailer: git-send-email 2.44.0.278.ge034bb2e1d-goog
> 
> Move the handful of MSR_IA32_VMX_MISC bit defines that are currently in
> msr-indx.h to vmx.h so that all of the VMX_MISC defines and wrappers can
> be found in a single location.
> 
> Opportunistically use BIT_ULL() instead of open coding hex values, add
> defines for feature bits that are architectural defined, and move the
> defines down in the file so that they are colocated with the helpers for
> getting fields from VMX_MISC.
> 
> No functional change intended.
> 
> Cc: Shan Kang <shan.kang@...el.com>
> Cc: Kai Huang <kai.huang@...el.com>
> Signed-off-by: Xin Li <xin3.li@...el.com>
> [sean: split to separate patch, write changelog]
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/x86/include/asm/msr-index.h |  5 -----
>  arch/x86/include/asm/vmx.h       | 19 ++++++++++++-------
>  arch/x86/kvm/vmx/capabilities.h  |  4 ++--
>  arch/x86/kvm/vmx/nested.c        |  2 +-
>  arch/x86/kvm/vmx/nested.h        |  2 +-
>  5 files changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> index 5ca81ad509b5..3531856def3d 100644
> --- a/arch/x86/include/asm/msr-index.h
> +++ b/arch/x86/include/asm/msr-index.h
> @@ -1138,11 +1138,6 @@
>  #define MSR_IA32_SMBA_BW_BASE		0xc0000280
>  #define MSR_IA32_EVT_CFG_BASE		0xc0000400
>  
> -/* MSR_IA32_VMX_MISC bits */
> -#define MSR_IA32_VMX_MISC_INTEL_PT                 (1ULL << 14)
> -#define MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS (1ULL << 29)
> -#define MSR_IA32_VMX_MISC_PREEMPTION_TIMER_SCALE   0x1F
> -
>  /* AMD-V MSRs */
>  #define MSR_VM_CR                       0xc0010114
>  #define MSR_VM_IGNNE                    0xc0010115
> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
> index ce6d166fc3c5..6ff179b11235 100644
> --- a/arch/x86/include/asm/vmx.h
> +++ b/arch/x86/include/asm/vmx.h
> @@ -120,13 +120,6 @@
>  
>  #define VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR	0x000011ff
>  
> -#define VMX_MISC_PREEMPTION_TIMER_RATE_MASK	0x0000001f
> -#define VMX_MISC_SAVE_EFER_LMA			0x00000020
> -#define VMX_MISC_ACTIVITY_HLT			0x00000040
> -#define VMX_MISC_ACTIVITY_WAIT_SIPI		0x00000100
> -#define VMX_MISC_ZERO_LEN_INS			0x40000000
> -#define VMX_MISC_MSR_LIST_MULTIPLIER		512
> -
>  /* VMFUNC functions */
>  #define VMFUNC_CONTROL_BIT(x)	BIT((VMX_FEATURE_##x & 0x1f) - 28)
>  
> @@ -155,6 +148,18 @@ static inline u32 vmx_basic_vmcs_mem_type(u64 vmx_basic)
>  	return (vmx_basic & GENMASK_ULL(53, 50)) >> 50;
>  }
>  
> +#define VMX_MISC_PREEMPTION_TIMER_RATE_MASK	GENMASK_ULL(4, 0)
> +#define VMX_MISC_SAVE_EFER_LMA			BIT_ULL(5)
> +#define VMX_MISC_ACTIVITY_HLT			BIT_ULL(6)
> +#define VMX_MISC_ACTIVITY_SHUTDOWN		BIT_ULL(7)
> +#define VMX_MISC_ACTIVITY_WAIT_SIPI		BIT_ULL(8)
> +#define VMX_MISC_INTEL_PT			BIT_ULL(14)
> +#define VMX_MISC_RDMSR_IN_SMM			BIT_ULL(15)
> +#define VMX_MISC_VMXOFF_BLOCK_SMI		BIT_ULL(28)
> +#define VMX_MISC_VMWRITE_SHADOW_RO_FIELDS	BIT_ULL(29)
> +#define VMX_MISC_ZERO_LEN_INS			BIT_ULL(30)
> +#define VMX_MISC_MSR_LIST_MULTIPLIER		512
> +

Maybe it's better to mention this patch also define some new bits:

* VMX_MISC_ACTIVITY_SHUTDOWN
* VMX_MISC_RDMSR_IN_SMM
* VMX_MISC_VMXOFF_BLOCK_SMI

Otherwise,

Reviewed-by: Zhao Liu <zhao1.liu@...el.com>