linux-kernel - Re: [RFC PATCH 07/13] KVM: SVM: Update avic_kick_target

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Date:   Thu, 24 Feb 2022 19:35:26 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     pbonzini@...hat.com, seanjc@...gle.com, joro@...tes.org,
        jon.grimm@....com, wei.huang2@....com, terry.bowman@....com
Subject: Re: [RFC PATCH 07/13] KVM: SVM: Update avic_kick_target_vcpus to
 support 32-bit APIC ID

On Sun, 2022-02-20 at 20:19 -0600, Suravee Suthikulpanit wrote:
> In x2APIC mode, ICRH contains 32-bit destination APIC ID.
> So, update the avic_kick_target_vcpus() accordingly.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  arch/x86/kvm/svm/avic.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
> index 60f30e48d816..215d8a7dbc1d 100644
> --- a/arch/x86/kvm/svm/avic.c
> +++ b/arch/x86/kvm/svm/avic.c
> @@ -307,10 +307,16 @@ void avic_ring_doorbell(struct kvm_vcpu *vcpu)
>  }
>  
>  static void avic_kick_target_vcpus(struct kvm *kvm, struct kvm_lapic *source,
> -				   u32 icrl, u32 icrh)
> +				   u32 icrl, u32 icrh, bool x2apic_enabled)
>  {
>  	struct kvm_vcpu *vcpu;
>  	unsigned long i;
> +	u32 dest;
> +
> +	if (x2apic_enabled)
> +		dest = icrh;
> +	else
> +		dest = GET_APIC_DEST_FIELD(icrh);


Just use 'apic_x2apic_mode(apic)', no need for x2apic_enabled parameter
as I said in patch 6.

Also maybe rename GET_APIC_DEST_FIELD to GET_XAPIC_DEST_FIELD or something as it is
wrong for x2apic.

Best regards,
	Maxim Levitsky

>  
>  	/*
>  	 * Wake any target vCPUs that are blocking, i.e. waiting for a wake
> @@ -320,8 +326,7 @@ static void avic_kick_target_vcpus(struct kvm *kvm, struct kvm_lapic *source,
>  	 */
>  	kvm_for_each_vcpu(i, vcpu, kvm) {
>  		if (kvm_apic_match_dest(vcpu, source, icrl & APIC_SHORT_MASK,
> -					GET_APIC_DEST_FIELD(icrh),
> -					icrl & APIC_DEST_MASK)) {
> +					dest, icrl & APIC_DEST_MASK)) {
>  			vcpu->arch.apic->irr_pending = true;
>  			svm_complete_interrupt_delivery(vcpu,
>  							icrl & APIC_MODE_MASK,
> @@ -364,7 +369,7 @@ int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu)
>  		 * set the appropriate IRR bits on the valid target
>  		 * vcpus. So, we just need to kick the appropriate vcpu.
>  		 */
> -		avic_kick_target_vcpus(vcpu->kvm, apic, icrl, icrh);
> +		avic_kick_target_vcpus(vcpu->kvm, apic, icrl, icrh, svm->x2apic_enabled);
>  		break;
>  	case AVIC_IPI_FAILURE_INVALID_TARGET:
>  		break;