linux-kernel - Re: [PATCH v3 4/4] vfio/type1: Use iommu_aux_at(de)tach

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Date:   Fri, 31 Jul 2020 09:39:37 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     "Liu, Yi L" <yi.l.liu@...el.com>, Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     baolu.lu@...ux.intel.com, Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Cornelia Huck <cohuck@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH v3 4/4] vfio/type1: Use iommu_aux_at(de)tach_group() APIs

Hi Yi,

On 7/30/20 5:36 PM, Liu, Yi L wrote:
>> From: Lu Baolu<baolu.lu@...ux.intel.com>
>> Sent: Tuesday, July 14, 2020 1:57 PM
>>
>> Replace iommu_aux_at(de)tach_device() with iommu_aux_at(de)tach_group().
>> It also saves the IOMMU_DEV_FEAT_AUX-capable physcail device in the vfio_group
>> data structure so that it could be reused in other places.
>>
>> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
>> ---
>>   drivers/vfio/vfio_iommu_type1.c | 44 ++++++---------------------------
>>   1 file changed, 7 insertions(+), 37 deletions(-)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index 5e556ac9102a..f8812e68de77 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -100,6 +100,7 @@ struct vfio_dma {
>>   struct vfio_group {
>>   	struct iommu_group	*iommu_group;
>>   	struct list_head	next;
>> +	struct device		*iommu_device;
> I know mdev group has only one device, so such a group has a single
> iommu_device. But I guess may be helpful to add a comment here or in
> commit message. Otherwise, it looks weird that a group structure
> contains a single iommu_device field instead of a list of iommu_device.
> 

Right! I will add some comments if this is still needed in the next
version.

Best regards,
baolu