Re: [PATCH 07/17] KVM: Move irq routing setup to irqchip.c

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Apr 19, 2013 at 04:06:18PM +0200, Alexander Graf wrote:
> Setting up IRQ routes is nothing IOAPIC specific. Extract everything
> that really is generic code into irqchip.c and only leave the ioapic
> specific bits to irq_comm.c.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  include/linux/kvm_host.h |    3 ++
>  virt/kvm/irq_comm.c      |   76 ++---------------------------------------
>  virt/kvm/irqchip.c       |   85 ++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 91 insertions(+), 73 deletions(-)
> 
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index a7bfe9d..dcef724 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -961,6 +961,9 @@ int kvm_set_irq_routing(struct kvm *kvm,
>  			const struct kvm_irq_routing_entry *entries,
>  			unsigned nr,
>  			unsigned flags);
> +int kvm_set_routing_entry(struct kvm_irq_routing_table *rt,
> +			  struct kvm_kernel_irq_routing_entry *e,
> +			  const struct kvm_irq_routing_entry *ue);
>  void kvm_free_irq_routing(struct kvm *kvm);
>  
>  int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
> diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
> index d5008f4..e2e6b44 100644
> --- a/virt/kvm/irq_comm.c
> +++ b/virt/kvm/irq_comm.c
> @@ -271,27 +271,14 @@ void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
>  	rcu_read_unlock();
>  }
>  
> -static int setup_routing_entry(struct kvm_irq_routing_table *rt,
> -			       struct kvm_kernel_irq_routing_entry *e,
> -			       const struct kvm_irq_routing_entry *ue)
> +int kvm_set_routing_entry(struct kvm_irq_routing_table *rt,
> +			  struct kvm_kernel_irq_routing_entry *e,
> +			  const struct kvm_irq_routing_entry *ue)
>  {
>  	int r = -EINVAL;
>  	int delta;
>  	unsigned max_pin;
> -	struct kvm_kernel_irq_routing_entry *ei;
>  
> -	/*
> -	 * Do not allow GSI to be mapped to the same irqchip more than once.
> -	 * Allow only one to one mapping between GSI and MSI.
> -	 */
> -	hlist_for_each_entry(ei, &rt->map[ue->gsi], link)
> -		if (ei->type == KVM_IRQ_ROUTING_MSI ||
> -		    ue->type == KVM_IRQ_ROUTING_MSI ||
> -		    ue->u.irqchip.irqchip == ei->irqchip.irqchip)
> -			return r;
> -
> -	e->gsi = ue->gsi;
> -	e->type = ue->type;
>  	switch (ue->type) {
>  	case KVM_IRQ_ROUTING_IRQCHIP:
>  		delta = 0;
> @@ -328,68 +315,11 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
>  		goto out;
>  	}
>  
> -	hlist_add_head(&e->link, &rt->map[e->gsi]);
>  	r = 0;
>  out:
>  	return r;
>  }
>  
> -int kvm_set_irq_routing(struct kvm *kvm,
> -			const struct kvm_irq_routing_entry *ue,
> -			unsigned nr,
> -			unsigned flags)
> -{
> -	struct kvm_irq_routing_table *new, *old;
> -	u32 i, j, nr_rt_entries = 0;
> -	int r;
> -
> -	for (i = 0; i < nr; ++i) {
> -		if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
> -			return -EINVAL;
> -		nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
> -	}
> -
> -	nr_rt_entries += 1;
> -
> -	new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
> -		      + (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
> -		      GFP_KERNEL);
> -
> -	if (!new)
> -		return -ENOMEM;
> -
> -	new->rt_entries = (void *)&new->map[nr_rt_entries];
> -
> -	new->nr_rt_entries = nr_rt_entries;
> -	for (i = 0; i < 3; i++)
> -		for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++)
> -			new->chip[i][j] = -1;
> -
> -	for (i = 0; i < nr; ++i) {
> -		r = -EINVAL;
> -		if (ue->flags)
> -			goto out;
> -		r = setup_routing_entry(new, &new->rt_entries[i], ue);
> -		if (r)
> -			goto out;
> -		++ue;
> -	}
> -
> -	mutex_lock(&kvm->irq_lock);
> -	old = kvm->irq_routing;
> -	kvm_irq_routing_update(kvm, new);
> -	mutex_unlock(&kvm->irq_lock);
> -
> -	synchronize_rcu();
> -
> -	new = old;
> -	r = 0;
> -
> -out:
> -	kfree(new);
> -	return r;
> -}
> -
>  #define IOAPIC_ROUTING_ENTRY(irq) \
>  	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,	\
>  	  .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
> diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
> index 12f7f26..20dc9e4 100644
> --- a/virt/kvm/irqchip.c
> +++ b/virt/kvm/irqchip.c
> @@ -150,3 +150,88 @@ void kvm_free_irq_routing(struct kvm *kvm)
>  	   at this stage */
>  	kfree(kvm->irq_routing);
>  }
> +
> +static int setup_routing_entry(struct kvm_irq_routing_table *rt,
> +			       struct kvm_kernel_irq_routing_entry *e,
> +			       const struct kvm_irq_routing_entry *ue)
> +{
> +	int r = -EINVAL;
> +	struct kvm_kernel_irq_routing_entry *ei;
> +
> +	/*
> +	 * Do not allow GSI to be mapped to the same irqchip more than once.
> +	 * Allow only one to one mapping between GSI and MSI.
> +	 */
> +	hlist_for_each_entry(ei, &rt->map[ue->gsi], link)
> +		if (ei->type == KVM_IRQ_ROUTING_MSI ||
> +		    ue->type == KVM_IRQ_ROUTING_MSI ||
> +		    ue->u.irqchip.irqchip == ei->irqchip.irqchip)
> +			return r;
> +
> +	e->gsi = ue->gsi;
> +	e->type = ue->type;
> +	r = kvm_set_routing_entry(rt, e, ue);
> +	if (r)
> +		goto out;
> +
> +	hlist_add_head(&e->link, &rt->map[e->gsi]);
> +	r = 0;
> +out:
> +	return r;
> +}
> +
> +int kvm_set_irq_routing(struct kvm *kvm,
> +			const struct kvm_irq_routing_entry *ue,
> +			unsigned nr,
> +			unsigned flags)
> +{
> +	struct kvm_irq_routing_table *new, *old;
> +	u32 i, j, nr_rt_entries = 0;
> +	int r;
> +
> +	for (i = 0; i < nr; ++i) {
> +		if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
> +			return -EINVAL;
> +		nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
> +	}
> +
> +	nr_rt_entries += 1;
> +
> +	new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
> +		      + (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
> +		      GFP_KERNEL);
> +
> +	if (!new)
> +		return -ENOMEM;
> +
> +	new->rt_entries = (void *)&new->map[nr_rt_entries];
> +
> +	new->nr_rt_entries = nr_rt_entries;
> +	for (i = 0; i < KVM_NR_IRQCHIPS; i++)
> +		for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++)
> +			new->chip[i][j] = -1;
> +
> +	for (i = 0; i < nr; ++i) {
> +		r = -EINVAL;
> +		if (ue->flags)
> +			goto out;
> +		r = setup_routing_entry(new, &new->rt_entries[i], ue);
> +		if (r)
> +			goto out;
> +		++ue;
> +	}
> +
> +	mutex_lock(&kvm->irq_lock);
> +	old = kvm->irq_routing;
> +	kvm_irq_routing_update(kvm, new);
> +	mutex_unlock(&kvm->irq_lock);
> +
> +	synchronize_rcu();
> +
> +	new = old;
> +	r = 0;
> +
> +out:
> +	kfree(new);
> +	return r;
> +}
> -- 
> 1.6.0.2
> 
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