Re: [Qemu-devel] [PATCH v14 08/22] vfio iommu type1: Add find_iommu_group() function

[Auger Eric]

Hi Kirti,

On 21/11/2016 12:55, Kirti Wankhede wrote:
> 
> Hi Eric,
> 
> Thanks for your reviews.
> Alex had already pulled this series into his next branch for v4.10.
> 
> http://www.mail-archive.com/address@hidden/msg1274745.html

Yes I am showing up too late and noticed that later :-(

Anyway I needed (and still need) to look at it.

Thanks

Eric
> 
> Thanks,
> Kirti
> 
> On 11/21/2016 4:59 PM, Auger Eric wrote:
>> Hi,
>> On 16/11/2016 21:46, Kirti Wankhede wrote:
>>> Add find_iommu_group()
>>>
>>> Signed-off-by: Kirti Wankhede <address@hidden>
>>> Signed-off-by: Neo Jia <address@hidden>
>>> Reviewed-by: Jike Song <address@hidden>
>>> Reviewed-by: Dong Jia Shi <address@hidden>
>>>
>>> Change-Id: I9d372f1ebe9eb01a5a21374b8a2b03f7df73601f
>>> ---
>>>  drivers/vfio/vfio_iommu_type1.c | 57 
>>> ++++++++++++++++++++++++-----------------
>>>  1 file changed, 33 insertions(+), 24 deletions(-)
>>>
>>> diff --git a/drivers/vfio/vfio_iommu_type1.c 
>>> b/drivers/vfio/vfio_iommu_type1.c
>>> index 52af5fc01d91..ffe2026f1341 100644
>>> --- a/drivers/vfio/vfio_iommu_type1.c
>>> +++ b/drivers/vfio/vfio_iommu_type1.c
>>> @@ -752,11 +752,24 @@ static void vfio_test_domain_fgsp(struct vfio_domain 
>>> *domain)
>>>     __free_pages(pages, order);
>>>  }
>>>  
>>> +static struct vfio_group *find_iommu_group(struct vfio_domain *domain,
>>> +                                      struct iommu_group *iommu_group)
>>> +{
>>> +   struct vfio_group *g;
>>> +
>>> +   list_for_each_entry(g, &domain->group_list, next) {
>>> +           if (g->iommu_group == iommu_group)
>>> +                   return g;
>>> +   }
>>> +
>>> +   return NULL;
>>> +}
>>> +
>>>  static int vfio_iommu_type1_attach_group(void *iommu_data,
>>>                                      struct iommu_group *iommu_group)
>>>  {
>>>     struct vfio_iommu *iommu = iommu_data;
>>> -   struct vfio_group *group, *g;
>>> +   struct vfio_group *group;
>>>     struct vfio_domain *domain, *d;
>>>     struct bus_type *bus = NULL;
>>>     int ret;
>>> @@ -764,10 +777,7 @@ static int vfio_iommu_type1_attach_group(void 
>>> *iommu_data,
>>>     mutex_lock(&iommu->lock);
>>>  
>>>     list_for_each_entry(d, &iommu->domain_list, next) {
>>> -           list_for_each_entry(g, &d->group_list, next) {
>>> -                   if (g->iommu_group != iommu_group)
>>> -                           continue;
>>> -
>>> +           if (find_iommu_group(d, iommu_group)) {
>>>                     mutex_unlock(&iommu->lock);
>>>                     return -EINVAL;
>>>             }
>>> @@ -887,27 +897,26 @@ static void vfio_iommu_type1_detach_group(void 
>>> *iommu_data,
>>>     mutex_lock(&iommu->lock);
>>>  
>>>     list_for_each_entry(domain, &iommu->domain_list, next) {
>>> -           list_for_each_entry(group, &domain->group_list, next) {
>>> -                   if (group->iommu_group != iommu_group)
>>> -                           continue;
>>> +           group = find_iommu_group(domain, iommu_group);
>>> +           if (!group)
>>> +                   continue;
>>>  
>>> -                   iommu_detach_group(domain->domain, iommu_group);
>>> -                   list_del(&group->next);
>>> -                   kfree(group);
>>> -                   /*
>>> -                    * Group ownership provides privilege, if the group
>>> -                    * list is empty, the domain goes away.  If it's the
>>> -                    * last domain, then all the mappings go away too.
>>> -                    */
>>> -                   if (list_empty(&domain->group_list)) {
>>> -                           if (list_is_singular(&iommu->domain_list))
>>> -                                   vfio_iommu_unmap_unpin_all(iommu);
>>> -                           iommu_domain_free(domain->domain);
>>> -                           list_del(&domain->next);
>>> -                           kfree(domain);
>>> -                   }
>>> -                   goto done;
>>> +           iommu_detach_group(domain->domain, iommu_group);
>>> +           list_del(&group->next);
>>> +           kfree(group);
>>> +           /*
>>> +            * Group ownership provides privilege, if the group
>>> +            * list is empty, the domain goes away.  If it's the
>>> +            * last domain, then all the mappings go away too.
>>> +            */
>>> +           if (list_empty(&domain->group_list)) {
>>> +                   if (list_is_singular(&iommu->domain_list))
>>> +                           vfio_iommu_unmap_unpin_all(iommu);
>>> +                   iommu_domain_free(domain->domain);
>>> +                   list_del(&domain->next);
>>> +                   kfree(domain);
>>>             }
>>> +           goto done;
>>>     }
>>>  
>>>  done:
>>>
>> Reviewed-by: Eric Auger <address@hidden>
>>
>> Eric
>>