linux-kernel - Re: [RFC 8/9] KVM: KVM-VFIO: add kvm_vfio_arch

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Date:	Tue, 26 Aug 2014 13:02:30 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Eric Auger <eric.auger@...aro.org>
Cc:	eric.auger@...com, christoffer.dall@...aro.org,
	marc.zyngier@....com, linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
	joel.schopp@....com, kim.phillips@...escale.com,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	will.deacon@....com, a.motakis@...tualopensystems.com,
	a.rigo@...tualopensystems.com, john.liuli@...wei.com
Subject: Re: [RFC 8/9] KVM: KVM-VFIO: add kvm_vfio_arch_data and accessors

On Mon, 2014-08-25 at 15:27 +0200, Eric Auger wrote:
> add a pointer to architecture specific data in kvm_vfio struct
> add accessors to keep kvm_vfio private
> 
> Signed-off-by: Eric Auger <eric.auger@...aro.org>
> ---
>  arch/arm/include/asm/kvm_host.h |  8 ++++++++
>  virt/kvm/vfio.c                 | 21 +++++++++++++++++++++
>  2 files changed, 29 insertions(+)
> 
> diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
> index 62cbf5b..4f1edbf 100644
> --- a/arch/arm/include/asm/kvm_host.h
> +++ b/arch/arm/include/asm/kvm_host.h
> @@ -177,6 +177,14 @@ void kvm_vfio_device_put_external_user(struct vfio_device *vdev);
>  int kvm_vfio_external_get_type(struct vfio_device *vdev);
>  struct device *kvm_vfio_external_get_base_device(struct vfio_device *vdev);
>  
> +struct kvm_vfio;
> +struct kvm_vfio_arch_data;
> +void kvm_vfio_device_set_arch_data(struct kvm_vfio *kv,
> +				   struct kvm_vfio_arch_data *ptr);
> +struct kvm_vfio_arch_data *kvm_vfio_device_get_arch_data(struct kvm_vfio *kv);
> +void kvm_vfio_lock(struct kvm_vfio *kv);
> +void kvm_vfio_unlock(struct kvm_vfio *kv);
> +
>  /* We do not have shadow page tables, hence the empty hooks */
>  static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva)
>  {
> diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
> index f1c4e35..177b71e 100644
> --- a/virt/kvm/vfio.c
> +++ b/virt/kvm/vfio.c
> @@ -28,6 +28,7 @@ struct kvm_vfio {
>  	struct list_head group_list;
>  	struct mutex lock;
>  	bool noncoherent;
> +	struct kvm_vfio_arch_data *arch_data;
>  };
>  
>  static struct vfio_group *kvm_vfio_group_get_external_user(struct file *filep)
> @@ -338,6 +339,26 @@ static int kvm_vfio_create(struct kvm_device *dev, u32 type)
>  	return 0;
>  }
>  
> +void kvm_vfio_device_set_arch_data(struct kvm_vfio *kv,
> +				   struct kvm_vfio_arch_data *ptr)
> +{
> +	kv->arch_data = ptr;
> +}
> +
> +struct kvm_vfio_arch_data *kvm_vfio_device_get_arch_data(struct kvm_vfio *kv)
> +{

My preference would be s/get_//

> +	return kv->arch_data;
> +}
> +
> +void kvm_vfio_lock(struct kvm_vfio *kv)
> +{
> +	mutex_lock(&kv->lock);
> +}
> +
> +void kvm_vfio_unlock(struct kvm_vfio *kv)
> +{
> +	mutex_unlock(&kv->lock);
> +}

Gosh, what could go wrong...

>  
>  struct kvm_device_ops kvm_vfio_ops = {
>  	.name = "kvm-vfio",



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