On 02/07/2015 15:17, Eric Auger wrote:
> This patch adds the registration/unregistration of an
> irq_bypass_consumer on irqfd assignment/deassignment.
>
> Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
> ---
> virt/kvm/eventfd.c | 22 +++++++++++++++++++---
> 1 file changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
> index f3da161..425a47b 100644
> --- a/virt/kvm/eventfd.c
> +++ b/virt/kvm/eventfd.c
> @@ -34,6 +34,7 @@
> #include <linux/srcu.h>
> #include <linux/slab.h>
> #include <linux/seqlock.h>
> +#include <linux/irqbypass.h>
> #include <trace/events/kvm.h>
>
> #include <kvm/iodev.h>
> @@ -93,6 +94,7 @@ struct _irqfd {
> struct list_head list;
> poll_table pt;
> struct work_struct shutdown;
> + struct irq_bypass_consumer *cons;
> };
>
> static struct workqueue_struct *irqfd_cleanup_wq;
> @@ -429,7 +431,21 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
> */
> fdput(f);
>
> - /* irq_bypass_register_consumer(); */
> + irqfd->cons = kzalloc(sizeof(struct irq_bypass_consumer),
> + GFP_KERNEL);
Apart from the struct embedding technique I suggested in patch 12, this
looks very reasonable. Thanks!
Paolo
> + if (!irqfd->cons) {
> + ret = -ENOMEM;
> + goto fail;
> + }
> + irqfd->cons->token = (void *)irqfd->eventfd;
> + irqfd->cons->gsi = irqfd->gsi;
> + irqfd->cons->kvm = kvm;
> + irqfd->cons->add_producer = kvm_arch_add_producer;
> + irqfd->cons->del_producer = kvm_arch_del_producer;
> + irqfd->cons->stop_consumer = kvm_arch_stop_consumer;
> + irqfd->cons->resume_consumer = kvm_arch_resume_consumer;
> + ret = irq_bypass_register_consumer(irqfd->cons);
> + WARN_ON(ret);
>
> return 0;
>
> @@ -530,8 +546,6 @@ kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args)
> struct _irqfd *irqfd, *tmp;
> struct eventfd_ctx *eventfd;
>
> - /* irq_bypass_unregister_consumer() */
> -
> eventfd = eventfd_ctx_fdget(args->fd);
> if (IS_ERR(eventfd))
> return PTR_ERR(eventfd);
> @@ -550,6 +564,8 @@ kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args)
> irqfd->irq_entry.type = 0;
> write_seqcount_end(&irqfd->irq_entry_sc);
> irqfd_deactivate(irqfd);
> + irq_bypass_unregister_consumer(irqfd->cons);
> + kfree(irqfd->cons);
> }
> }
>
>
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