linux-kernel - Re: [PATCH v2 01/15] kvm: x86: Modify kvm_x86_ops.get_enable

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Date:   Tue, 27 Aug 2019 09:15:18 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     "Suthikulpanit\, Suravee" <Suravee.Suthikulpanit@....com>
Cc:     "pbonzini\@redhat.com" <pbonzini@...hat.com>,
        "rkrcmar\@redhat.com" <rkrcmar@...hat.com>,
        "joro\@8bytes.org" <joro@...tes.org>,
        "graf\@amazon.com" <graf@...zon.com>,
        "jschoenh\@amazon.de" <jschoenh@...zon.de>,
        "karahmed\@amazon.de" <karahmed@...zon.de>,
        "rimasluk\@amazon.com" <rimasluk@...zon.com>,
        "Grimm\, Jon" <Jon.Grimm@....com>,
        "Suthikulpanit\, Suravee" <Suravee.Suthikulpanit@....com>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm\@vger.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 01/15] kvm: x86: Modify kvm_x86_ops.get_enable_apicv() to use struct kvm parameter

"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com> writes:

> Generally, APICv for all vcpus in the VM are enable/disable in the same
> manner. So, get_enable_apicv() should represent APICv status of the VM
> instead of each VCPU.
>
> Modify kvm_x86_ops.get_enable_apicv() to take struct kvm as parameter
> instead of struct kvm_vcpu.
>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  arch/x86/include/asm/kvm_host.h | 2 +-
>  arch/x86/kvm/svm.c              | 5 +++--
>  arch/x86/kvm/vmx/vmx.c          | 2 +-
>  arch/x86/kvm/x86.c              | 2 +-
>  4 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 26d1eb8..56bc702 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1077,7 +1077,7 @@ struct kvm_x86_ops {
>  	void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
>  	void (*enable_irq_window)(struct kvm_vcpu *vcpu);
>  	void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
> -	bool (*get_enable_apicv)(struct kvm_vcpu *vcpu);
> +	bool (*get_enable_apicv)(struct kvm *kvm);
>  	void (*refresh_apicv_exec_ctrl)(struct kvm_vcpu *vcpu);
>  	void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
>  	void (*hwapic_isr_update)(struct kvm_vcpu *vcpu, int isr);
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index ccd5aa6..6851bce 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -384,6 +384,7 @@ struct amd_svm_iommu_ir {
>  static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
>  static void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa);
>  static void svm_complete_interrupts(struct vcpu_svm *svm);
> +static bool svm_get_enable_apicv(struct kvm *kvm);

Why is this forward declaration needed [in this patch]?

>  
>  static int nested_svm_exit_handled(struct vcpu_svm *svm);
>  static int nested_svm_intercept(struct vcpu_svm *svm);
> @@ -5124,9 +5125,9 @@ static void svm_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
>  	return;
>  }
>  
> -static bool svm_get_enable_apicv(struct kvm_vcpu *vcpu)
> +static bool svm_get_enable_apicv(struct kvm *kvm)
>  {
> -	return avic && irqchip_split(vcpu->kvm);
> +	return avic && irqchip_split(kvm);
>  }
>  
>  static void svm_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr)
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index d98eac3..18a4b94 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -3610,7 +3610,7 @@ void pt_update_intercept_for_msr(struct vcpu_vmx *vmx)
>  	}
>  }
>  
> -static bool vmx_get_enable_apicv(struct kvm_vcpu *vcpu)
> +static bool vmx_get_enable_apicv(struct kvm *kvm)
>  {
>  	return enable_apicv;
>  }
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index fafd81d..7daf0dd 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -9150,7 +9150,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
>  		goto fail_free_pio_data;
>  
>  	if (irqchip_in_kernel(vcpu->kvm)) {
> -		vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(vcpu);
> +		vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(vcpu->kvm);
>  		r = kvm_create_lapic(vcpu, lapic_timer_advance_ns);
>  		if (r < 0)
>  			goto fail_mmu_destroy;

With the above question answered (or declaration moved to the patch
where it's actually needed)

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

-- 
Vitaly