> From: Jan Kiszka
> Sent: Tuesday, September 13, 2011 12:58 AM
>
> The threaded IRQ handler for MSI-X has almost nothing in common with the
> INTx/MSI handler. Move its code into a dedicated handler.
if it's desired to further go down this cleanup path, there's also no need to
register ack notifier for MSI-X type device since all the logic there is simply
a nop:
static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
{
struct kvm_assigned_dev_kernel *dev;
if (kian->gsi == -1)
return;
dev = container_of(kian, struct kvm_assigned_dev_kernel,
ack_notifier);
kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
/* The guest irq may be shared so this ack may be
* from another device.
*/
spin_lock(&dev->intx_lock);
if (dev->host_irq_disabled) {
enable_irq(dev->host_irq);
dev->host_irq_disabled = false;
}
spin_unlock(&dev->intx_lock);
}
Thanks
Kevin
>
> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
> ---
> virt/kvm/assigned-dev.c | 32 +++++++++++++++++++-------------
> 1 files changed, 19 insertions(+), 13 deletions(-)
>
> diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
> index 84ead54..7debe8c 100644
> --- a/virt/kvm/assigned-dev.c
> +++ b/virt/kvm/assigned-dev.c
> @@ -58,8 +58,6 @@ static int find_index_from_host_irq(struct
> kvm_assigned_dev_kernel
> static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
> {
> struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
> - u32 vector;
> - int index;
>
> if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) {
> spin_lock(&assigned_dev->intx_lock);
> @@ -68,20 +66,28 @@ static irqreturn_t kvm_assigned_dev_thread(int irq,
> void *dev_id)
> spin_unlock(&assigned_dev->intx_lock);
> }
>
> - if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
> - index = find_index_from_host_irq(assigned_dev, irq);
> - if (index >= 0) {
> - vector = assigned_dev->
> - guest_msix_entries[index].vector;
> - kvm_set_irq(assigned_dev->kvm,
> - assigned_dev->irq_source_id, vector, 1);
> - }
> - } else
> + kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
> + assigned_dev->guest_irq, 1);
> +
> + return IRQ_HANDLED;
> +}
> +
> +#ifdef __KVM_HAVE_MSIX
> +static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
> +{
> + struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
> + int index = find_index_from_host_irq(assigned_dev, irq);
> + u32 vector;
> +
> + if (index >= 0) {
> + vector = assigned_dev->guest_msix_entries[index].vector;
> kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
> - assigned_dev->guest_irq, 1);
> + vector, 1);
> + }
>
> return IRQ_HANDLED;
> }
> +#endif
>
> /* Ack the irq line for an assigned device */
> static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
> @@ -279,7 +285,7 @@ static int assigned_device_enable_host_msix(struct
> kvm *kvm,
>
> for (i = 0; i < dev->entries_nr; i++) {
> r = request_threaded_irq(dev->host_msix_entries[i].vector,
> - NULL, kvm_assigned_dev_thread,
> + NULL, kvm_assigned_dev_thread_msix,
> 0, dev->irq_name, dev);
> if (r)
> goto err;
> --
> 1.7.3.4
> --
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