Subject: [PATCH V2 2/3] Add iommu driver for hi6220 SoC platform

From: [email-masked] (chenfeng)
Date: Fri, 23 Oct 2015 17:10:31 +0800

Hi Robin,

On 2015/10/20 23:02, Robin Murphy wrote:
> On 20/10/15 09:45, Chen Feng wrote:
>> iommu/hisilicon: Add hi6220-SoC smmu driver
> 

>> +
>> +static int hi6220_smmu_attach_dev(struct iommu_domain *domain,
>> +                  struct device *dev)
>> +{
>> +    dev->archdata.iommu = &iova_allocator;
> 
> If the hardware doesn't offer any kind of device isolation (i.e. multiple translation contexts), then you should probably have more logic here to ensure only a single domain can ever be active at once.
> 
>> +    return 0;
>> +}
>> +
I feel confused about your above comments. Could you help explain "ensure only a single domain can ever be active at once"?

> Robin.
> .