Hi Andre,
On 04/15/2016 04:04 PM, Andre Przywara wrote:
> From: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
>
> The communication of a Linux IRQ number from outside the VGIC to the
> vgic was a leftover from the day when the vgic code cared about how a
> particular device injects virtual interrupts mapped to a physical
> interrupt.
>
> We can safely remove this notion, leaving all physical IRQ handling to
> be done in the device driver (the arch timer in this case), which makes
> room for a saner API for the new VGIC.
>
> Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
> ---
> include/kvm/arm_vgic.h | 3 +--
> virt/kvm/arm/arch_timer.c | 22 ++++++++++++++++++++--
> virt/kvm/arm/vgic.c | 20 ++------------------
> 3 files changed, 23 insertions(+), 22 deletions(-)
>
> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
> index 43eeb18..49c559e 100644
> --- a/include/kvm/arm_vgic.h
> +++ b/include/kvm/arm_vgic.h
> @@ -157,7 +157,6 @@ struct vgic_io_device {
> struct irq_phys_map {
> u32 virt_irq;
> u32 phys_irq;
> - u32 irq;
> };
>
> struct irq_phys_map_entry {
> @@ -345,7 +344,7 @@ int kvm_vgic_inject_mapped_irq(struct kvm *kvm, int cpuid,
> void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
> int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
> struct irq_phys_map *kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu,
> - int virt_irq, int irq);
> + int virt_irq, int phys_irq);
> int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq);
> bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq);
>
> diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
> index b4d96b1..cfdf88f 100644
> --- a/virt/kvm/arm/arch_timer.c
> +++ b/virt/kvm/arm/arch_timer.c
> @@ -274,7 +274,7 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
> if (timer->active_cleared_last && !phys_active)
> return;
>
> - ret = irq_set_irqchip_state(timer->map->irq,
> + ret = irq_set_irqchip_state(host_vtimer_irq,
> IRQCHIP_STATE_ACTIVE,
> phys_active);
> WARN_ON(ret);
> @@ -307,6 +307,9 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
> {
> struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
> struct irq_phys_map *map;
> + struct irq_desc *desc;
> + struct irq_data *data;
> + int phys_irq;
>
> /*
> * The vcpu timer irq number cannot be determined in
> @@ -326,10 +329,25 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
> kvm_timer_update_state(vcpu);
>
> /*
> + * Find the physical IRQ number corresponding to the host_vtimer_irq
> + */
> + desc = irq_to_desc(host_vtimer_irq);
> + if (!desc) {
can this really happen?
> + kvm_err("%s: no interrupt descriptor\n", __func__);
> + return -EINVAL;
> + }
> +
> + data = irq_desc_get_irq_data(desc);
> + while (data->parent_data)
> + data = data->parent_data;
> +
> + phys_irq = data->hwirq;
> +
> + /*
> * Tell the VGIC that the virtual interrupt is tied to a
> * physical interrupt. We do that once per VCPU.
> */
> - map = kvm_vgic_map_phys_irq(vcpu, irq->irq, host_vtimer_irq);
> + map = kvm_vgic_map_phys_irq(vcpu, irq->irq, phys_irq);
> if (WARN_ON(IS_ERR(map)))
> return PTR_ERR(map);
>
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index 2d7ae35..ac5838b 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -1723,27 +1723,13 @@ static struct list_head *vgic_get_irq_phys_map_list(struct kvm_vcpu *vcpu,
> * Returns a valid pointer on success, and an error pointer otherwise
> */
the doc comment must be updated
* @irq: The Linux IRQ number
Besides
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Cheers
Eric
> struct irq_phys_map *kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu,
> - int virt_irq, int irq)
> + int virt_irq, int phys_irq)
> {
> struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
> struct list_head *root = vgic_get_irq_phys_map_list(vcpu, virt_irq);
> struct irq_phys_map *map;
> struct irq_phys_map_entry *entry;
> - struct irq_desc *desc;
> - struct irq_data *data;
> - int phys_irq;
>
> - desc = irq_to_desc(irq);
> - if (!desc) {
> - kvm_err("%s: no interrupt descriptor\n", __func__);
> - return ERR_PTR(-EINVAL);
> - }
> -
> - data = irq_desc_get_irq_data(desc);
> - while (data->parent_data)
> - data = data->parent_data;
> -
> - phys_irq = data->hwirq;
>
> /* Create a new mapping */
> entry = kzalloc(sizeof(*entry), GFP_KERNEL);
> @@ -1756,8 +1742,7 @@ struct irq_phys_map *kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu,
> map = vgic_irq_map_search(vcpu, virt_irq);
> if (map) {
> /* Make sure this mapping matches */
> - if (map->phys_irq != phys_irq ||
> - map->irq != irq)
> + if (map->phys_irq != phys_irq)
> map = ERR_PTR(-EINVAL);
>
> /* Found an existing, valid mapping */
> @@ -1767,7 +1752,6 @@ struct irq_phys_map *kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu,
> map = &entry->map;
> map->virt_irq = virt_irq;
> map->phys_irq = phys_irq;
> - map->irq = irq;
>
> list_add_tail_rcu(&entry->entry, root);
>
>
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