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    Subject[PATCH v5 13/26] KVM: arm/arm64: GICv4: Propagate affinity changes to the physical ITS
    Date
    When the guest issues an affinity change, we need to tell the physical
    ITS that we're now targetting a new vcpu. This is done by extracting
    the current mapping, updating the target, and reapplying the mapping.

    Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
    Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
    ---
    virt/kvm/arm/vgic/vgic-its.c | 16 +++++++++++++++-
    1 file changed, 15 insertions(+), 1 deletion(-)

    diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
    index c9b1c0967426..42ffb9084bb7 100644
    --- a/virt/kvm/arm/vgic/vgic-its.c
    +++ b/virt/kvm/arm/vgic/vgic-its.c
    @@ -337,11 +337,25 @@ static int vgic_copy_lpi_list(struct kvm_vcpu *vcpu, u32 **intid_ptr)

    static int update_affinity(struct vgic_irq *irq, struct kvm_vcpu *vcpu)
    {
    + int ret = 0;
    +
    spin_lock(&irq->irq_lock);
    irq->target_vcpu = vcpu;
    spin_unlock(&irq->irq_lock);

    - return 0;
    + if (irq->hw) {
    + struct its_vlpi_map map;
    +
    + ret = its_get_vlpi(irq->host_irq, &map);
    + if (ret)
    + return ret;
    +
    + map.vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
    +
    + ret = its_map_vlpi(irq->host_irq, &map);
    + }
    +
    + return ret;
    }

    /*
    --
    2.11.0
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