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    Subject[PATCH v9 06/18] KVM: eventfd: add irq bypass consumer management
    Date
    From: Eric Auger <eric.auger@linaro.org>

    This patch adds the registration/unregistration of an
    irq_bypass_consumer on irqfd assignment/deassignment.

    Signed-off-by: Eric Auger <eric.auger@linaro.org>
    Signed-off-by: Feng Wu <feng.wu@intel.com>
    ---
    v4 -> v5:
    - due to removal of static inline stubs, add
    #ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
    around consumer registration/unregistration
    - add pr_info when registration fails

    v2 -> v3 (Feng Wu):
    - Use kvm_arch_irq_bypass_start
    - Remove kvm_arch_irq_bypass_update
    - Add member 'struct irq_bypass_producer *producer' in
    'struct kvm_kernel_irqfd', it is needed by posted interrupt.
    - Remove 'irq_bypass_unregister_consumer' in kvm_irqfd_deassign()

    v1 -> v2:
    - populate of kvm and gsi removed
    - unregister the consumer on irqfd_shutdown

    include/linux/kvm_irqfd.h | 2 ++
    virt/kvm/eventfd.c | 15 +++++++++++++++
    2 files changed, 17 insertions(+)

    diff --git a/include/linux/kvm_irqfd.h b/include/linux/kvm_irqfd.h
    index f926b39..0c1de05 100644
    --- a/include/linux/kvm_irqfd.h
    +++ b/include/linux/kvm_irqfd.h
    @@ -64,6 +64,8 @@ struct kvm_kernel_irqfd {
    struct list_head list;
    poll_table pt;
    struct work_struct shutdown;
    + struct irq_bypass_consumer consumer;
    + struct irq_bypass_producer *producer;
    };

    #endif /* __LINUX_KVM_IRQFD_H */
    diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
    index 647ffb8..d7a230f 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 +141,9 @@ irqfd_shutdown(struct work_struct *work)
    /*
    * It is now safe to release the object's resources
    */
    +#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
    + irq_bypass_unregister_consumer(&irqfd->consumer);
    +#endif
    eventfd_ctx_put(irqfd->eventfd);
    kfree(irqfd);
    }
    @@ -379,6 +383,17 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
    * we might race against the POLLHUP
    */
    fdput(f);
    +#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
    + 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.start = kvm_arch_irq_bypass_start;
    + ret = irq_bypass_register_consumer(&irqfd->consumer);
    + if (ret)
    + pr_info("irq bypass consumer (token %p) registration fails: %d\n",
    + irqfd->consumer.token, ret);
    +#endif

    return 0;

    --
    2.1.0


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