linux-kernel - Re: [PATCH 1/2] iommu/vt-d: Detach domain before using a private one

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Date:   Fri, 9 Aug 2019 08:48:36 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, kevin.tian@...el.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH 1/2] iommu/vt-d: Detach domain before using a private one

Hi Alex,

On 8/9/19 4:10 AM, Alex Williamson wrote:
> On Tue,  6 Aug 2019 08:14:08 +0800
> Lu Baolu <baolu.lu@...ux.intel.com> wrote:
> 
>> When the default domain of a group doesn't work for a device,
>> the iommu driver will try to use a private domain. The domain
>> which was previously attached to the device must be detached.
>>
>> Cc: Ashok Raj <ashok.raj@...el.com>
>> Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
>> Cc: Kevin Tian <kevin.tian@...el.com>
>> Cc: Alex Williamson <alex.williamson@...hat.com>
>> Fixes: 942067f1b6b97 ("iommu/vt-d: Identify default domains replaced with private")
>> Reported-by: Alex Williamson <alex.williamson@...hat.com>
>> Link: https://lkml.org/lkml/2019/8/2/1379
>> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
>> ---
> 
> Tested-by: Alex Williamson <alex.williamson@...hat.com>
> 
> This series resolves the issue I reported against:
>   iommu/vt-d: Cleanup get_valid_domain_for_dev()

Thank you for testing it.

Best regards,
Baolu

> 
> Thanks,
> Alex
> 
>>   drivers/iommu/intel-iommu.c | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
>> index 3e22fa6ae8c8..37259b7f95a7 100644
>> --- a/drivers/iommu/intel-iommu.c
>> +++ b/drivers/iommu/intel-iommu.c
>> @@ -3449,6 +3449,7 @@ static bool iommu_need_mapping(struct device *dev)
>>   				dmar_domain = to_dmar_domain(domain);
>>   				dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
>>   			}
>> +			dmar_remove_one_dev_info(dev);
>>   			get_private_domain_for_dev(dev);
>>   		}
>>   
>> @@ -4803,7 +4804,8 @@ static void dmar_remove_one_dev_info(struct device *dev)
>>   
>>   	spin_lock_irqsave(&device_domain_lock, flags);
>>   	info = dev->archdata.iommu;
>> -	__dmar_remove_one_dev_info(info);
>> +	if (info)
>> +		__dmar_remove_one_dev_info(info);
>>   	spin_unlock_irqrestore(&device_domain_lock, flags);
>>   }
>>   
>> @@ -5281,6 +5283,7 @@ static int intel_iommu_add_device(struct device *dev)
>>   		if (device_def_domain_type(dev) == IOMMU_DOMAIN_IDENTITY) {
>>   			ret = iommu_request_dm_for_dev(dev);
>>   			if (ret) {
>> +				dmar_remove_one_dev_info(dev);
>>   				dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
>>   				domain_add_dev_info(si_domain, dev);
>>   				dev_info(dev,
>> @@ -5291,6 +5294,7 @@ static int intel_iommu_add_device(struct device *dev)
>>   		if (device_def_domain_type(dev) == IOMMU_DOMAIN_DMA) {
>>   			ret = iommu_request_dma_domain_for_dev(dev);
>>   			if (ret) {
>> +				dmar_remove_one_dev_info(dev);
>>   				dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
>>   				if (!get_private_domain_for_dev(dev)) {
>>   					dev_warn(dev,
> 
>