linux-kernel - Re: [PATCH v2 6/8] KVM: x86: Fold 'enum kvm_ex_reg' definitions into 'enum kvm

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Date:   Mon, 30 Sep 2019 11:25:26 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Reto Buerki <reet@...elabs.ch>,
        Liran Alon <liran.alon@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH v2 6/8] KVM: x86: Fold 'enum kvm_ex_reg' definitions into 'enum kvm_reg'

Sean Christopherson <sean.j.christopherson@...el.com> writes:

> Now that indexing into arch.regs is either protected by WARN_ON_ONCE or
> done with hardcoded enums, combine all definitions for registers that
> are tracked by regs_avail and regs_dirty into 'enum kvm_reg'.  Having a
> single enum type will simplify additional cleanup related to regs_avail
> and regs_dirty.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>  arch/x86/include/asm/kvm_host.h | 4 +---
>  arch/x86/kvm/kvm_cache_regs.h   | 2 +-
>  2 files changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 23edf56cf577..a27f7f6b6b7a 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -156,10 +156,8 @@ enum kvm_reg {
>  	VCPU_REGS_R15 = __VCPU_REGS_R15,
>  #endif
>  	VCPU_REGS_RIP,
> -	NR_VCPU_REGS
> -};
> +	NR_VCPU_REGS,
>  
> -enum kvm_reg_ex {
>  	VCPU_EXREG_PDPTR = NR_VCPU_REGS,

(Personally, I would've changed that to NR_VCPU_REGS + 1)

>  	VCPU_EXREG_CR3,
>  	VCPU_EXREG_RFLAGS,
> diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h
> index 3972e1b65635..b85fc4b4e04f 100644
> --- a/arch/x86/kvm/kvm_cache_regs.h
> +++ b/arch/x86/kvm/kvm_cache_regs.h
> @@ -95,7 +95,7 @@ static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
>  
>  	if (!test_bit(VCPU_EXREG_PDPTR,
>  		      (unsigned long *)&vcpu->arch.regs_avail))
> -		kvm_x86_ops->cache_reg(vcpu, (enum kvm_reg)VCPU_EXREG_PDPTR);
> +		kvm_x86_ops->cache_reg(vcpu, VCPU_EXREG_PDPTR);
>  
>  	return vcpu->arch.walk_mmu->pdptrs[index];
>  }

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

-- 
Vitaly