linux-kernel - Re: [PATCH v2 1/6] kvm: Pass kvm

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Date:	Wed, 27 Jun 2012 12:35:00 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	avi@...hat.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	jan.kiszka@...mens.com
Subject: Re: [PATCH v2 1/6] kvm: Pass kvm_irqfd to functions

On Tue, Jun 26, 2012 at 11:09:04PM -0600, Alex Williamson wrote:
> Prune this down to just the struct kvm_irqfd so we can avoid
> changing function definition for every flag or field we use.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>

This is not needed anymore, right? We are not adding
new fields.

> ---
> 
>  include/linux/kvm_host.h |    4 ++--
>  virt/kvm/eventfd.c       |   20 ++++++++++----------
>  virt/kvm/kvm_main.c      |    2 +-
>  3 files changed, 13 insertions(+), 13 deletions(-)
> 
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 27ac8a4..ae3b426 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -824,7 +824,7 @@ static inline void kvm_free_irq_routing(struct kvm *kvm) {}
>  #ifdef CONFIG_HAVE_KVM_EVENTFD
>  
>  void kvm_eventfd_init(struct kvm *kvm);
> -int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags);
> +int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
>  void kvm_irqfd_release(struct kvm *kvm);
>  void kvm_irq_routing_update(struct kvm *, struct kvm_irq_routing_table *);
>  int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
> @@ -833,7 +833,7 @@ int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
>  
>  static inline void kvm_eventfd_init(struct kvm *kvm) {}
>  
> -static inline int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
> +static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
>  {
>  	return -EINVAL;
>  }
> diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
> index f59c1e8..c307c24 100644
> --- a/virt/kvm/eventfd.c
> +++ b/virt/kvm/eventfd.c
> @@ -198,7 +198,7 @@ static void irqfd_update(struct kvm *kvm, struct _irqfd *irqfd,
>  }
>  
>  static int
> -kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
> +kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
>  {
>  	struct kvm_irq_routing_table *irq_rt;
>  	struct _irqfd *irqfd, *tmp;
> @@ -212,12 +212,12 @@ kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
>  		return -ENOMEM;
>  
>  	irqfd->kvm = kvm;
> -	irqfd->gsi = gsi;
> +	irqfd->gsi = args->gsi;
>  	INIT_LIST_HEAD(&irqfd->list);
>  	INIT_WORK(&irqfd->inject, irqfd_inject);
>  	INIT_WORK(&irqfd->shutdown, irqfd_shutdown);
>  
> -	file = eventfd_fget(fd);
> +	file = eventfd_fget(args->fd);
>  	if (IS_ERR(file)) {
>  		ret = PTR_ERR(file);
>  		goto fail;
> @@ -298,19 +298,19 @@ kvm_eventfd_init(struct kvm *kvm)
>   * shutdown any irqfd's that match fd+gsi
>   */
>  static int
> -kvm_irqfd_deassign(struct kvm *kvm, int fd, int gsi)
> +kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args)
>  {
>  	struct _irqfd *irqfd, *tmp;
>  	struct eventfd_ctx *eventfd;
>  
> -	eventfd = eventfd_ctx_fdget(fd);
> +	eventfd = eventfd_ctx_fdget(args->fd);
>  	if (IS_ERR(eventfd))
>  		return PTR_ERR(eventfd);
>  
>  	spin_lock_irq(&kvm->irqfds.lock);
>  
>  	list_for_each_entry_safe(irqfd, tmp, &kvm->irqfds.items, list) {
> -		if (irqfd->eventfd == eventfd && irqfd->gsi == gsi) {
> +		if (irqfd->eventfd == eventfd && irqfd->gsi == args->gsi) {
>  			/*
>  			 * This rcu_assign_pointer is needed for when
>  			 * another thread calls kvm_irq_routing_update before
> @@ -338,12 +338,12 @@ kvm_irqfd_deassign(struct kvm *kvm, int fd, int gsi)
>  }
>  
>  int
> -kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
> +kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
>  {
> -	if (flags & KVM_IRQFD_FLAG_DEASSIGN)
> -		return kvm_irqfd_deassign(kvm, fd, gsi);
> +	if (args->flags & KVM_IRQFD_FLAG_DEASSIGN)
> +		return kvm_irqfd_deassign(kvm, args);
>  
> -	return kvm_irqfd_assign(kvm, fd, gsi);
> +	return kvm_irqfd_assign(kvm, args);
>  }
>  
>  /*
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 02cb440..b4ad14cc 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2059,7 +2059,7 @@ static long kvm_vm_ioctl(struct file *filp,
>  		r = -EFAULT;
>  		if (copy_from_user(&data, argp, sizeof data))
>  			goto out;
> -		r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
> +		r = kvm_irqfd(kvm, &data);
>  		break;
>  	}
>  	case KVM_IOEVENTFD: {
--
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