linux-kernel - Re: [PATCH v10 10/19] vfio iommu: Add blocking notifier to notify DMA

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Date:   Mon, 31 Oct 2016 14:05:07 +0800
From:   Jike Song <jike.song@...el.com>
To:     Kirti Wankhede <kwankhede@...dia.com>
CC:     alex.williamson@...hat.com, pbonzini@...hat.com, kraxel@...hat.com,
        cjia@...dia.com, qemu-devel@...gnu.org, kvm@...r.kernel.org,
        kevin.tian@...el.com, bjsdjshi@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 10/19] vfio iommu: Add blocking notifier to notify
 DMA_UNMAP

On 10/31/2016 01:59 PM, Kirti Wankhede wrote:
> On 10/31/2016 9:20 AM, Jike Song wrote:
>> On 10/27/2016 05:29 AM, Kirti Wankhede wrote:
>>> Added blocking notifier to IOMMU TYPE1 driver to notify vendor drivers
>>> about DMA_UNMAP.
>>> Exported two APIs vfio_register_notifier() and vfio_unregister_notifier().
>>> Vendor driver should register notifer using these APIs.
>>> Vendor driver should use VFIO_IOMMU_NOTIFY_DMA_UNMAP action to invalidate
>>> mappings.
>>>
>>> Signed-off-by: Kirti Wankhede <kwankhede@...dia.com>
>>> Signed-off-by: Neo Jia <cjia@...dia.com>
>>> Change-Id: I5910d0024d6be87f3e8d3e0ca0eaeaaa0b17f271
>>> ---
>>>  drivers/vfio/vfio.c             | 73 +++++++++++++++++++++++++++++++++
>>>  drivers/vfio/vfio_iommu_type1.c | 89 ++++++++++++++++++++++++++++++++++++-----
>>>  include/linux/vfio.h            | 11 +++++
>>>  3 files changed, 163 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
>>> index 28b50ca14c52..ff05ac6b1e90 100644
>>> --- a/drivers/vfio/vfio.c
>>> +++ b/drivers/vfio/vfio.c
>>> @@ -1891,6 +1891,79 @@ err_unpin_pages:
>>>  }
>>>  EXPORT_SYMBOL(vfio_unpin_pages);
>>>  
>>> +int vfio_register_notifier(struct device *dev, struct notifier_block *nb)
>>> +{
>>
>> Hi Kirti,
>>
>> Given that below 4 methods are members of vfio_iommu_driver_ops:
>>
>> 	pin_pages
>> 	unpin_pages
>> 	register_notifier
>> 	unregister_notifier
>>
>> the names of exposed VFIO APIs could possibly be clearer:
>>
>> 	vfio_iommu_pin_pages
>> 	vfio_iommu_unpin_pages
>> 	vfio_iommu_register_notifier
>> 	vfio_iommu_unreigster_nodier
>>
> 
> Hey Jike,
> 
> I had followed the same style as other members in this structure:
> 
> 	attach_group
> 	detach_group
> 

I mean the APIs exposed. For example, vfio_register_notifier() is somehow
by the name too generic to know what it is provided for.

--
Thanks,
Jike