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    Subject[v5 03/19] KVM: Define a new interface kvm_intr_is_single_vcpu()
    Date
    This patch defines a new interface kvm_intr_is_single_vcpu(),
    which can returns whether the interrupt is for single-CPU or not.

    It is used by VT-d PI, since now we only support single-CPU
    interrupts, For lowest-priority interrupts, if user configures
    it via /proc/irq or uses irqbalance to make it single-CPU, we
    can use PI to deliver the interrupts to it. Full functionality
    of lowest-priority support will be added later.

    Signed-off-by: Feng Wu <feng.wu@intel.com>
    ---
    arch/x86/include/asm/kvm_host.h | 2 ++
    arch/x86/kvm/irq_comm.c | 24 ++++++++++++++++++++++++
    2 files changed, 26 insertions(+)

    diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
    index f8c0ec3..b8832e5 100644
    --- a/arch/x86/include/asm/kvm_host.h
    +++ b/arch/x86/include/asm/kvm_host.h
    @@ -1180,4 +1180,6 @@ int kvm_pmu_read_pmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data);
    void kvm_handle_pmu_event(struct kvm_vcpu *vcpu);
    void kvm_deliver_pmi(struct kvm_vcpu *vcpu);

    +bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
    + struct kvm_vcpu **dest_vcpu);
    #endif /* _ASM_X86_KVM_HOST_H */
    diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
    index 72298b3..9e42645 100644
    --- a/arch/x86/kvm/irq_comm.c
    +++ b/arch/x86/kvm/irq_comm.c
    @@ -299,6 +299,30 @@ out:
    return r;
    }

    +bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
    + struct kvm_vcpu **dest_vcpu)
    +{
    + int i, r = 0;
    + struct kvm_vcpu *vcpu;
    +
    + kvm_for_each_vcpu(i, vcpu, kvm) {
    + if (!kvm_apic_present(vcpu))
    + continue;
    +
    + if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand,
    + irq->dest_id, irq->dest_mode))
    + continue;
    +
    + r++;
    + *dest_vcpu = vcpu;
    + }
    +
    + if (r == 1)
    + return true;
    + else
    + return false;
    +}
    +
    #define IOAPIC_ROUTING_ENTRY(irq) \
    { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
    .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } }
    --
    2.1.0


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