linux-kernel - Re: [PATCH 1/1] vfio iommu type1: WARN_ON if notifier block is not unregistered

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Date:   Tue, 6 Dec 2016 09:27:39 +0530
From:   Kirti Wankhede <kwankhede@...dia.com>
To:     Alex Williamson <alex.williamson@...hat.com>
CC:     <pbonzini@...hat.com>, <kraxel@...hat.com>, <cjia@...dia.com>,
        <qemu-devel@...gnu.org>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] vfio iommu type1: WARN_ON if notifier block is not
 unregistered



On 12/6/2016 4:56 AM, Alex Williamson wrote:
> On Tue, 6 Dec 2016 02:38:20 +0530
> Kirti Wankhede <kwankhede@...dia.com> wrote:
> 
>> mdev vendor driver should unregister the iommu notifier since the vfio
>> iommu can persist beyond the attachment of the mdev group. WARN_ON will
>> show warning if vendor driver doesn't unregister the notifier and is
>> forced to follow the implementations steps.
>>
>> Signed-off-by: Kirti Wankhede <kwankhede@...dia.com>
>> Signed-off-by: Neo Jia <cjia@...dia.com>
>> Change-Id: I75fd0a40e582a144fe7a037c7140d3513e8ff030
>> ---
>>  drivers/vfio/vfio_iommu_type1.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index 023fba7b8d5a..37871ee0c0c5 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -1361,6 +1361,8 @@ static void vfio_sanity_check_pfn_list(struct vfio_iommu *iommu)
>>  		if (WARN_ON(!RB_EMPTY_ROOT(&dma->pfn_list)))
>>  			break;
>>  	}
>> +	/* mdev venfor driver must unregister notifier */
> 
> s/venfor/vendor/
> 
>> +	WARN_ON(iommu->notifier.head);
>>  }
>>  
>>  static void vfio_iommu_type1_detach_group(void *iommu_data,
> 
> Applied for v4.10 with the above typo fix.  Thanks,
> 

Thanks Alex!