RE: [PATCH v1 05/11] vfio: Introduce host_iommu_device_create callback

[Duan, Zhenzhong]

Hi Eric,

>-----Original Message-----
>From: Eric Auger <eric.auger@redhat.com>
>Subject: Re: [PATCH v1 05/11] vfio: Introduce host_iommu_device_create
>callback
>
>Hi ZHenzhong,
>
>On 2/28/24 04:58, Zhenzhong Duan wrote:
>> Introduce host_iommu_device_create callback and a wrapper for it.
>>
>> This callback is used to allocate a host iommu device instance and
>> initialize it based on type.
>>
>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>> ---
>>  include/hw/vfio/vfio-common.h         | 1 +
>>  include/hw/vfio/vfio-container-base.h | 1 +
>>  hw/vfio/common.c                      | 8 ++++++++
>>  3 files changed, 10 insertions(+)
>>
>> diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-
>common.h
>> index b6676c9f79..9fefea4b89 100644
>> --- a/include/hw/vfio/vfio-common.h
>> +++ b/include/hw/vfio/vfio-common.h
>> @@ -208,6 +208,7 @@ struct vfio_device_info *vfio_get_device_info(int
>fd);
>>  int vfio_attach_device(char *name, VFIODevice *vbasedev,
>>                         AddressSpace *as, Error **errp);
>>  void vfio_detach_device(VFIODevice *vbasedev);
>> +void host_iommu_device_create(VFIODevice *vbasedev);
>>
>>  int vfio_kvm_device_add_fd(int fd, Error **errp);
>>  int vfio_kvm_device_del_fd(int fd, Error **errp);
>> diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-
>container-base.h
>> index b2813b0c11..dc003f6eb2 100644
>> --- a/include/hw/vfio/vfio-container-base.h
>> +++ b/include/hw/vfio/vfio-container-base.h
>> @@ -120,6 +120,7 @@ struct VFIOIOMMUClass {
>>      int (*attach_device)(const char *name, VFIODevice *vbasedev,
>>                           AddressSpace *as, Error **errp);
>>      void (*detach_device)(VFIODevice *vbasedev);
>> +    void (*host_iommu_device_create)(VFIODevice *vbasedev);
>>      /* migration feature */
>>      int (*set_dirty_page_tracking)(const VFIOContainerBase *bcontainer,
>>                                     bool start);
>> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
>> index 059bfdc07a..41e9031c59 100644
>> --- a/hw/vfio/common.c
>> +++ b/hw/vfio/common.c
>> @@ -1521,3 +1521,11 @@ void vfio_detach_device(VFIODevice
>*vbasedev)
>>      }
>>      vbasedev->bcontainer->ops->detach_device(vbasedev);
>>  }
>> +
>> +void host_iommu_device_create(VFIODevice *vbasedev)
>> +{
>> +    const VFIOIOMMUClass *ops = vbasedev->bcontainer->ops;
>> +
>> +    assert(ops->host_iommu_device_create);
>at this stage ops actual implementation do not exist yet so this will
>break the bisection

This patch only introcudes host_iommu_device_create but no one call
into it. Patch6-7 implement callback for different backend,
patch8 call host_iommu_device_create(), so I think the order is ok.
Let me know if I missed your points.

Thanks
Zhenzhong

>
>Eric
>> +    ops->host_iommu_device_create(vbasedev);
>> +}