Signed-off-by: Feng Wu <feng...@intel.com>
> -----Original Message----- > From: iommu-boun...@lists.linux-foundation.org > [mailto:iommu-boun...@lists.linux-foundation.org] On Behalf Of Feng Wu > Sent: Friday, September 18, 2015 10:30 PM > To: pbonz...@redhat.com; alex.william...@redhat.com; j...@8bytes.org; > mtosa...@redhat.com > Cc: io...@lists.linux-foundation.org; linux-ker...@vger.kernel.org; > kvm@vger.kernel.org; eric.au...@linaro.org > Subject: [PATCH v9 04/18] KVM: create kvm_irqfd.h > > From: Eric Auger <eric.au...@linaro.org> > > Move _irqfd_resampler and _irqfd struct declarations in a new > public header: kvm_irqfd.h. They are respectively renamed into > kvm_kernel_irqfd_resampler and kvm_kernel_irqfd. Those datatypes > will be used by architecture specific code, in the context of > IRQ bypass manager integration. > > Signed-off-by: Eric Auger <eric.au...@linaro.org> > --- > include/linux/kvm_irqfd.h | 69 ++++++++++++++++++++++++++++++++++ > virt/kvm/eventfd.c | 95 > ++++++++++++----------------------------------- > 2 files changed, 92 insertions(+), 72 deletions(-) > create mode 100644 include/linux/kvm_irqfd.h > > diff --git a/include/linux/kvm_irqfd.h b/include/linux/kvm_irqfd.h > new file mode 100644 > index 0000000..f926b39 > --- /dev/null > +++ b/include/linux/kvm_irqfd.h > @@ -0,0 +1,69 @@ > +/* > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * irqfd: Allows an fd to be used to inject an interrupt to the guest > + * Credit goes to Avi Kivity for the original idea. > + */ > + > +#ifndef __LINUX_KVM_IRQFD_H > +#define __LINUX_KVM_IRQFD_H > + > +#include <linux/kvm_host.h> > +#include <linux/poll.h> > + > +/* > + * Resampling irqfds are a special variety of irqfds used to emulate > + * level triggered interrupts. The interrupt is asserted on eventfd > + * trigger. On acknowledgment through the irq ack notifier, the > + * interrupt is de-asserted and userspace is notified through the > + * resamplefd. All resamplers on the same gsi are de-asserted > + * together, so we don't need to track the state of each individual > + * user. We can also therefore share the same irq source ID. > + */ > +struct kvm_kernel_irqfd_resampler { > + struct kvm *kvm; > + /* > + * List of resampling struct _irqfd objects sharing this gsi. > + * RCU list modified under kvm->irqfds.resampler_lock > + */ > + struct list_head list; > + struct kvm_irq_ack_notifier notifier; > + /* > + * Entry in list of kvm->irqfd.resampler_list. Use for sharing > + * resamplers among irqfds on the same gsi. > + * Accessed and modified under kvm->irqfds.resampler_lock > + */ > + struct list_head link; > +}; > + > +struct kvm_kernel_irqfd { > + /* Used for MSI fast-path */ > + struct kvm *kvm; > + wait_queue_t wait; > + /* Update side is protected by irqfds.lock */ > + struct kvm_kernel_irq_routing_entry irq_entry; > + seqcount_t irq_entry_sc; > + /* Used for level IRQ fast-path */ > + int gsi; > + struct work_struct inject; > + /* The resampler used by this irqfd (resampler-only) */ > + struct kvm_kernel_irqfd_resampler *resampler; > + /* Eventfd notified on resample (resampler-only) */ > + struct eventfd_ctx *resamplefd; > + /* Entry in list of irqfds for a resampler (resampler-only) */ > + struct list_head resampler_link; > + /* Used for setup/shutdown */ > + struct eventfd_ctx *eventfd; > + struct list_head list; > + poll_table pt; > + struct work_struct shutdown; > +}; > + > +#endif /* __LINUX_KVM_IRQFD_H */ > diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c > index 9ff4193..647ffb8 100644 > --- a/virt/kvm/eventfd.c > +++ b/virt/kvm/eventfd.c > @@ -23,6 +23,7 @@ > > #include <linux/kvm_host.h> > #include <linux/kvm.h> > +#include <linux/kvm_irqfd.h> > #include <linux/workqueue.h> > #include <linux/syscalls.h> > #include <linux/wait.h> > @@ -39,68 +40,14 @@ > #include <kvm/iodev.h> > > #ifdef CONFIG_HAVE_KVM_IRQFD > -/* > - * -------------------------------------------------------------------- > - * irqfd: Allows an fd to be used to inject an interrupt to the guest > - * > - * Credit goes to Avi Kivity for the original idea. > - * -------------------------------------------------------------------- > - */ > - > -/* > - * Resampling irqfds are a special variety of irqfds used to emulate > - * level triggered interrupts. The interrupt is asserted on eventfd > - * trigger. On acknowledgement through the irq ack notifier, the > - * interrupt is de-asserted and userspace is notified through the > - * resamplefd. All resamplers on the same gsi are de-asserted > - * together, so we don't need to track the state of each individual > - * user. We can also therefore share the same irq source ID. > - */ > -struct _irqfd_resampler { > - struct kvm *kvm; > - /* > - * List of resampling struct _irqfd objects sharing this gsi. > - * RCU list modified under kvm->irqfds.resampler_lock > - */ > - struct list_head list; > - struct kvm_irq_ack_notifier notifier; > - /* > - * Entry in list of kvm->irqfd.resampler_list. Use for sharing > - * resamplers among irqfds on the same gsi. > - * Accessed and modified under kvm->irqfds.resampler_lock > - */ > - struct list_head link; > -}; > - > -struct _irqfd { > - /* Used for MSI fast-path */ > - struct kvm *kvm; > - wait_queue_t wait; > - /* Update side is protected by irqfds.lock */ > - struct kvm_kernel_irq_routing_entry irq_entry; > - seqcount_t irq_entry_sc; > - /* Used for level IRQ fast-path */ > - int gsi; > - struct work_struct inject; > - /* The resampler used by this irqfd (resampler-only) */ > - struct _irqfd_resampler *resampler; > - /* Eventfd notified on resample (resampler-only) */ > - struct eventfd_ctx *resamplefd; > - /* Entry in list of irqfds for a resampler (resampler-only) */ > - struct list_head resampler_link; > - /* Used for setup/shutdown */ > - struct eventfd_ctx *eventfd; > - struct list_head list; > - poll_table pt; > - struct work_struct shutdown; > -}; > > static struct workqueue_struct *irqfd_cleanup_wq; > > static void > irqfd_inject(struct work_struct *work) > { > - struct _irqfd *irqfd = container_of(work, struct _irqfd, inject); > + struct kvm_kernel_irqfd *irqfd = > + container_of(work, struct kvm_kernel_irqfd, inject); > struct kvm *kvm = irqfd->kvm; > > if (!irqfd->resampler) { > @@ -121,12 +68,13 @@ irqfd_inject(struct work_struct *work) > static void > irqfd_resampler_ack(struct kvm_irq_ack_notifier *kian) > { > - struct _irqfd_resampler *resampler; > + struct kvm_kernel_irqfd_resampler *resampler; > struct kvm *kvm; > - struct _irqfd *irqfd; > + struct kvm_kernel_irqfd *irqfd; > int idx; > > - resampler = container_of(kian, struct _irqfd_resampler, notifier); > + resampler = container_of(kian, > + struct kvm_kernel_irqfd_resampler, notifier); > kvm = resampler->kvm; > > kvm_set_irq(kvm, KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, > @@ -141,9 +89,9 @@ irqfd_resampler_ack(struct kvm_irq_ack_notifier *kian) > } > > static void > -irqfd_resampler_shutdown(struct _irqfd *irqfd) > +irqfd_resampler_shutdown(struct kvm_kernel_irqfd *irqfd) > { > - struct _irqfd_resampler *resampler = irqfd->resampler; > + struct kvm_kernel_irqfd_resampler *resampler = irqfd->resampler; > struct kvm *kvm = resampler->kvm; > > mutex_lock(&kvm->irqfds.resampler_lock); > @@ -168,7 +116,8 @@ irqfd_resampler_shutdown(struct _irqfd *irqfd) > static void > irqfd_shutdown(struct work_struct *work) > { > - struct _irqfd *irqfd = container_of(work, struct _irqfd, shutdown); > + struct kvm_kernel_irqfd *irqfd = > + container_of(work, struct kvm_kernel_irqfd, shutdown); > u64 cnt; > > /* > @@ -198,7 +147,7 @@ irqfd_shutdown(struct work_struct *work) > > /* assumes kvm->irqfds.lock is held */ > static bool > -irqfd_is_active(struct _irqfd *irqfd) > +irqfd_is_active(struct kvm_kernel_irqfd *irqfd) > { > return list_empty(&irqfd->list) ? false : true; > } > @@ -209,7 +158,7 @@ irqfd_is_active(struct _irqfd *irqfd) > * assumes kvm->irqfds.lock is held > */ > static void > -irqfd_deactivate(struct _irqfd *irqfd) > +irqfd_deactivate(struct kvm_kernel_irqfd *irqfd) > { > BUG_ON(!irqfd_is_active(irqfd)); > > @@ -224,7 +173,8 @@ irqfd_deactivate(struct _irqfd *irqfd) > static int > irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key) > { > - struct _irqfd *irqfd = container_of(wait, struct _irqfd, wait); > + struct kvm_kernel_irqfd *irqfd = > + container_of(wait, struct kvm_kernel_irqfd, wait); > unsigned long flags = (unsigned long)key; > struct kvm_kernel_irq_routing_entry irq; > struct kvm *kvm = irqfd->kvm; > @@ -274,12 +224,13 @@ static void > irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *wqh, > poll_table *pt) > { > - struct _irqfd *irqfd = container_of(pt, struct _irqfd, pt); > + struct kvm_kernel_irqfd *irqfd = > + container_of(pt, struct kvm_kernel_irqfd, pt); > add_wait_queue(wqh, &irqfd->wait); > } > > /* Must be called under irqfds.lock */ > -static void irqfd_update(struct kvm *kvm, struct _irqfd *irqfd) > +static void irqfd_update(struct kvm *kvm, struct kvm_kernel_irqfd *irqfd) > { > struct kvm_kernel_irq_routing_entry *e; > struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS]; > @@ -304,7 +255,7 @@ static void irqfd_update(struct kvm *kvm, struct _irqfd > *irqfd) > static int > kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) > { > - struct _irqfd *irqfd, *tmp; > + struct kvm_kernel_irqfd *irqfd, *tmp; > struct fd f; > struct eventfd_ctx *eventfd = NULL, *resamplefd = NULL; > int ret; > @@ -340,7 +291,7 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd > *args) > irqfd->eventfd = eventfd; > > if (args->flags & KVM_IRQFD_FLAG_RESAMPLE) { > - struct _irqfd_resampler *resampler; > + struct kvm_kernel_irqfd_resampler *resampler; > > resamplefd = eventfd_ctx_fdget(args->resamplefd); > if (IS_ERR(resamplefd)) { > @@ -525,7 +476,7 @@ kvm_eventfd_init(struct kvm *kvm) > static int > kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args) > { > - struct _irqfd *irqfd, *tmp; > + struct kvm_kernel_irqfd *irqfd, *tmp; > struct eventfd_ctx *eventfd; > > eventfd = eventfd_ctx_fdget(args->fd); > @@ -581,7 +532,7 @@ kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args) > void > kvm_irqfd_release(struct kvm *kvm) > { > - struct _irqfd *irqfd, *tmp; > + struct kvm_kernel_irqfd *irqfd, *tmp; > > spin_lock_irq(&kvm->irqfds.lock); > > @@ -604,7 +555,7 @@ kvm_irqfd_release(struct kvm *kvm) > */ > void kvm_irq_routing_update(struct kvm *kvm) > { > - struct _irqfd *irqfd; > + struct kvm_kernel_irqfd *irqfd; > > spin_lock_irq(&kvm->irqfds.lock); > > -- > 2.1.0 > > _______________________________________________ > iommu mailing list > io...@lists.linux-foundation.org > https://lists.linuxfoundation.org/mailman/listinfo/iommu -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
