linux-kernel - Re: [PATCH 1/6] KVM: x86: Add callback functions for handling APIC ID, DFR and LDR update

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Message-ID: <15e1b25c-906a-03dd-cb69-6b99c8c98ff7@redhat.com>
Date:   Wed, 3 Jul 2019 23:16:41 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Cc:     "joro@...tes.org" <joro@...tes.org>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>
Subject: Re: [PATCH 1/6] KVM: x86: Add callback functions for handling APIC
 ID, DFR and LDR update

On 22/03/19 12:57, Suthikulpanit, Suravee wrote:
> Add hooks for handling the case when guest VM update APIC ID, DFR and LDR.
> This is needed during AMD AVIC is temporary deactivated.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

Why not do this later when AVIC is reactivated, in
svm_refresh_apicv_exec_ctrl?

Thanks,

Paolo

> ---
>  arch/x86/include/asm/kvm_host.h | 3 +++
>  arch/x86/kvm/lapic.c            | 6 ++++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index a5db4475e72d..1906e205e6a3 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1077,6 +1077,9 @@ struct kvm_x86_ops {
>  	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);
> +	void (*hwapic_apic_id_update)(struct kvm_vcpu *vcpu);
> +	void (*hwapic_dfr_update)(struct kvm_vcpu *vcpu);
> +	void (*hwapic_ldr_update)(struct kvm_vcpu *vcpu);
>  	bool (*guest_apic_has_interrupt)(struct kvm_vcpu *vcpu);
>  	void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
>  	void (*set_virtual_apic_mode)(struct kvm_vcpu *vcpu);
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 991fdf7fc17f..95295cf81283 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -262,12 +262,16 @@ static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
>  static inline void kvm_apic_set_xapic_id(struct kvm_lapic *apic, u8 id)
>  {
>  	kvm_lapic_set_reg(apic, APIC_ID, id << 24);
> +	if (kvm_x86_ops->hwapic_apic_id_update)
> +		kvm_x86_ops->hwapic_apic_id_update(apic->vcpu);
>  	recalculate_apic_map(apic->vcpu->kvm);
>  }
>  
>  static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
>  {
>  	kvm_lapic_set_reg(apic, APIC_LDR, id);
> +	if (kvm_x86_ops->hwapic_ldr_update)
> +		kvm_x86_ops->hwapic_ldr_update(apic->vcpu);
>  	recalculate_apic_map(apic->vcpu->kvm);
>  }
>  
> @@ -1836,6 +1840,8 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
>  	case APIC_DFR:
>  		if (!apic_x2apic_mode(apic)) {
>  			kvm_lapic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
> +			if (kvm_x86_ops->hwapic_dfr_update)
> +				kvm_x86_ops->hwapic_dfr_update(apic->vcpu);
>  			recalculate_apic_map(apic->vcpu->kvm);
>  		} else
>  			ret = 1;
>