linux-kernel - Re: [PATCH] KVM: VMX: Add helpers to identify interrupt type from intr

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Message-ID: <9ee673cd-29b5-3e9a-ce34-9314c736df59@redhat.com>
Date:   Mon, 15 Jun 2020 18:12:18 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: VMX: Add helpers to identify interrupt type from
 intr_info

On 09/06/20 03:45, Sean Christopherson wrote:
> Add is_intr_type() and is_intr_type_n() to consolidate the boilerplate
> code for querying a specific type of interrupt given an encoded value
> from VMCS.VM_{ENTER,EXIT}_INTR_INFO, with and without an associated
> vector respectively.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
> 
> I wrote and proposed a version of this patch a while back[*], but AFAICT
> never posted it as a formal patch.
> 
> [*] https://lkml.kernel.org/r/20190819233537.GG1916@linux.intel.com
> 
>  arch/x86/kvm/vmx/vmcs.h | 32 ++++++++++++++++++++------------
>  1 file changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx/vmcs.h b/arch/x86/kvm/vmx/vmcs.h
> index 5c0ff80b85c0..7a3675fddec2 100644
> --- a/arch/x86/kvm/vmx/vmcs.h
> +++ b/arch/x86/kvm/vmx/vmcs.h
> @@ -72,11 +72,24 @@ struct loaded_vmcs {
>  	struct vmcs_controls_shadow controls_shadow;
>  };
>  
> +static inline bool is_intr_type(u32 intr_info, u32 type)
> +{
> +	const u32 mask = INTR_INFO_VALID_MASK | INTR_INFO_INTR_TYPE_MASK;
> +
> +	return (intr_info & mask) == (INTR_INFO_VALID_MASK | type);
> +}
> +
> +static inline bool is_intr_type_n(u32 intr_info, u32 type, u8 vector)
> +{
> +	const u32 mask = INTR_INFO_VALID_MASK | INTR_INFO_INTR_TYPE_MASK |
> +			 INTR_INFO_VECTOR_MASK;
> +
> +	return (intr_info & mask) == (INTR_INFO_VALID_MASK | type | vector);
> +}
> +
>  static inline bool is_exception_n(u32 intr_info, u8 vector)
>  {
> -	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
> -			     INTR_INFO_VALID_MASK)) ==
> -		(INTR_TYPE_HARD_EXCEPTION | vector | INTR_INFO_VALID_MASK);
> +	return is_intr_type_n(intr_info, INTR_TYPE_HARD_EXCEPTION, vector);
>  }
>  
>  static inline bool is_debug(u32 intr_info)
> @@ -106,28 +119,23 @@ static inline bool is_gp_fault(u32 intr_info)
>  
>  static inline bool is_machine_check(u32 intr_info)
>  {
> -	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
> -			     INTR_INFO_VALID_MASK)) ==
> -		(INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
> +	return is_exception_n(intr_info, MC_VECTOR);
>  }
>  
>  /* Undocumented: icebp/int1 */
>  static inline bool is_icebp(u32 intr_info)
>  {
> -	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
> -		== (INTR_TYPE_PRIV_SW_EXCEPTION | INTR_INFO_VALID_MASK);
> +	return is_intr_type(intr_info, INTR_TYPE_PRIV_SW_EXCEPTION);
>  }
>  
>  static inline bool is_nmi(u32 intr_info)
>  {
> -	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
> -		== (INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK);
> +	return is_intr_type(intr_info, INTR_TYPE_NMI_INTR);
>  }
>  
>  static inline bool is_external_intr(u32 intr_info)
>  {
> -	return (intr_info & (INTR_INFO_VALID_MASK | INTR_INFO_INTR_TYPE_MASK))
> -		== (INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR);
> +	return is_intr_type(intr_info, INTR_TYPE_EXT_INTR);
>  }
>  
>  enum vmcs_field_width {
> 

Queued, thnkas.

Paolo