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

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Date:	Wed, 27 Aug 2014 17:22:30 +0200
From:	Eric Auger <eric.auger@...aro.org>
To:	Alex Williamson <alex.williamson@...hat.com>
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 08/26/2014 09:02 PM, Alex Williamson wrote:
> 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_//
ok
> 
>> +	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...
Hum sorry I did not understand what you meant here

Thanks

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

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