linux-kernel - Re: [RFCv2 PATCH 05/12] KVM: SVM: Update avic_kick_target

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Message-ID: <0ef090101aefbc3bb05bbfae5e7177c8a4cf5122.camel@redhat.com>
Date:   Thu, 24 Mar 2022 13:36:10 +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: [RFCv2 PATCH 05/12] KVM: SVM: Update avic_kick_target_vcpus to
 support 32-bit APIC ID

On Tue, 2022-03-08 at 10:39 -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 | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
> index f128b0189d4a..5329b93dc4cd 100644
> --- a/arch/x86/kvm/svm/avic.c
> +++ b/arch/x86/kvm/svm/avic.c
> @@ -307,9 +307,15 @@ static void avic_kick_target_vcpus(struct kvm *kvm, struct kvm_lapic *source,
>  	 * since entered the guest will have processed pending IRQs at VMRUN.
>  	 */
>  	kvm_for_each_vcpu(i, vcpu, kvm) {
> +		u32 dest;
> +
> +		if (apic_x2apic_mode(vcpu->arch.apic))
> +			dest = icrh;
> +		else
> +			dest = GET_XAPIC_DEST_FIELD(icrh);
> +
>  		if (kvm_apic_match_dest(vcpu, source, icrl & APIC_SHORT_MASK,
> -					GET_XAPIC_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,

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

Best regards,
	Maxim Levitsky