linux-kernel - Re: [PATCH RFC 05/11] KVM: x86: hyper-v: Introduce kvm_hv_synic_has

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Message-ID: <e9092c88813a9cfa9d02928eb818788a0af1147c.camel@redhat.com>
Date:   Thu, 12 Oct 2023 22:36:46 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 05/11] KVM: x86: hyper-v: Introduce
 kvm_hv_synic_has_vector()

У вт, 2023-10-10 у 18:02 +0200, Vitaly Kuznetsov пише:
> As a preparation to making Hyper-V emulation optional, create a dedicated
> kvm_hv_synic_has_vector() helper to avoid extra ifdefs in lapic.c.
> 
> No functional change intended.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/kvm/hyperv.h | 5 +++++
>  arch/x86/kvm/lapic.c  | 3 +--
>  2 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
> index 1897a219981d..ddb1d0b019e6 100644
> --- a/arch/x86/kvm/hyperv.h
> +++ b/arch/x86/kvm/hyperv.h
> @@ -105,6 +105,11 @@ int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint);
>  void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector);
>  int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages);
>  
> +static inline bool kvm_hv_synic_has_vector(struct kvm_vcpu *vcpu, int vector)
> +{
> +	return to_hv_vcpu(vcpu) && test_bit(vector, to_hv_synic(vcpu)->vec_bitmap);
> +}
> +
>  static inline bool kvm_hv_synic_auto_eoi_set(struct kvm_vcpu *vcpu, int vector)
>  {
>  	return to_hv_vcpu(vcpu) && test_bit(vector, to_hv_synic(vcpu)->auto_eoi_bitmap);
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 0e80c1fdf899..37904c5d421b 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -1475,8 +1475,7 @@ static int apic_set_eoi(struct kvm_lapic *apic)
>  	apic_clear_isr(vector, apic);
>  	apic_update_ppr(apic);
>  
> -	if (to_hv_vcpu(apic->vcpu) &&
> -	    test_bit(vector, to_hv_synic(apic->vcpu)->vec_bitmap))
> +	if (kvm_hv_synic_has_vector(apic->vcpu, vector))
>  		kvm_hv_synic_send_eoi(apic->vcpu, vector);
>  
>  	kvm_ioapic_send_eoi(apic, vector);

Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com

Best regards,
	Maxim Levitsky