linux-kernel - Re: [PATCH v5 6/9] iommufd: Fault-capable hwpt attach/detach/replace

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Date: Fri, 10 May 2024 11:20:01 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: baolu.lu@...ux.intel.com, Kevin Tian <kevin.tian@...el.com>,
 Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>,
 Jean-Philippe Brucker <jean-philippe@...aro.org>,
 Nicolin Chen <nicolinc@...dia.com>, Yi Liu <yi.l.liu@...el.com>,
 Jacob Pan <jacob.jun.pan@...ux.intel.com>,
 Joel Granados <j.granados@...sung.com>, iommu@...ts.linux.dev,
 virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 6/9] iommufd: Fault-capable hwpt attach/detach/replace

On 5/8/24 8:18 AM, Jason Gunthorpe wrote:
> On Tue, Apr 30, 2024 at 10:57:07PM +0800, Lu Baolu wrote:
>> diff --git a/drivers/iommu/iommufd/fault.c b/drivers/iommu/iommufd/fault.c
>> index 13125c0feecb..6357229bf3b4 100644
>> --- a/drivers/iommu/iommufd/fault.c
>> +++ b/drivers/iommu/iommufd/fault.c
>> @@ -15,6 +15,124 @@
>>   #include "../iommu-priv.h"
>>   #include "iommufd_private.h"
>>   
>> +static int iommufd_fault_iopf_enable(struct iommufd_device *idev)
>> +{
>> +	int ret;
>> +
>> +	if (idev->iopf_enabled)
>> +		return 0;
>> +
>> +	ret = iommu_dev_enable_feature(idev->dev, IOMMU_DEV_FEAT_IOPF);
>> +	if (ret)
>> +		return ret;
>> +
>> +	idev->iopf_enabled = true;
>> +
>> +	return 0;
>> +}
> I would greatly prefer we remove this from the drivers :\ I guess it
> is Ok for now
> 
> Doesn't this need a counter? We can have many fault capable PASIDs?
> That will get changed in the PASID series?

Okay, let's design this more gracefully after the PASID interfaces are
landed. For now, we assume that the device driver will do this.

Best regards,
baolu