[RFC v2 6/6] KVM: eventfd: add irq bypass consumer management
Wu, Feng
feng.wu at intel.com
Tue Jul 7 01:47:55 PDT 2015
> -----Original Message-----
> From: Eric Auger [mailto:eric.auger at linaro.org]
> Sent: Monday, July 06, 2015 8:12 PM
> To: eric.auger at st.com; eric.auger at linaro.org;
> linux-arm-kernel at lists.infradead.org; kvmarm at lists.cs.columbia.edu;
> kvm at vger.kernel.org; christoffer.dall at linaro.org; marc.zyngier at arm.com;
> alex.williamson at redhat.com; pbonzini at redhat.com; avi.kivity at gmail.com;
> mtosatti at redhat.com; Wu, Feng; joro at 8bytes.org;
> b.reynal at virtualopensystems.com
> Cc: linux-kernel at vger.kernel.org; patches at linaro.org
> Subject: [RFC v2 6/6] KVM: eventfd: add irq bypass consumer management
>
> This patch adds the registration/unregistration of an
> irq_bypass_consumer on irqfd assignment/deassignment.
>
> Signed-off-by: Eric Auger <eric.auger at linaro.org>
>
> ---
>
> v1 -> v2:
> - populate of kvm and gsi removed
> - unregister the consumer on irqfd_shutdown
> ---
> include/linux/kvm_irqfd.h | 1 +
> virt/kvm/eventfd.c | 14 +++++++++++---
> 2 files changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/kvm_irqfd.h b/include/linux/kvm_irqfd.h
> index f926b39..3c0bd07 100644
> --- a/include/linux/kvm_irqfd.h
> +++ b/include/linux/kvm_irqfd.h
> @@ -64,6 +64,7 @@ struct kvm_kernel_irqfd {
> struct list_head list;
> poll_table pt;
> struct work_struct shutdown;
> + struct irq_bypass_consumer consumer;
> };
>
> #endif /* __LINUX_KVM_IRQFD_H */
> diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
> index b79dc61..9452754 100644
> --- a/virt/kvm/eventfd.c
> +++ b/virt/kvm/eventfd.c
> @@ -35,6 +35,7 @@
> #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>
> @@ -140,6 +141,7 @@ irqfd_shutdown(struct work_struct *work)
> /*
> * It is now safe to release the object's resources
> */
> + irq_bypass_unregister_consumer(&irqfd->consumer);
> eventfd_ctx_put(irqfd->eventfd);
> kfree(irqfd);
> }
> @@ -380,7 +382,14 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd
> *args)
> */
> fdput(f);
>
> - /* irq_bypass_register_consumer(); */
> + irqfd->consumer.token = (void *)irqfd->eventfd;
> + irqfd->consumer.add_producer = kvm_arch_irq_bypass_add_producer;
> + irqfd->consumer.del_producer = kvm_arch_irq_bypass_del_producer;
> + irqfd->consumer.stop = kvm_arch_irq_bypass_stop;
> + irqfd->consumer.resume = kvm_arch_irq_bypass_resume;
> + irqfd->consumer.update = kvm_arch_irq_bypass_update;
> + ret = irq_bypass_register_consumer(&irqfd->consumer);
> + WARN_ON(ret);
>
> return 0;
>
> @@ -481,8 +490,6 @@ kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd
> *args)
> struct kvm_kernel_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);
> @@ -501,6 +508,7 @@ 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->consumer);
consumer is unregistered in irqfd_shutdown(), why need we do it here?
Thanks,
Feng
> }
> }
>
> --
> 1.9.1
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