linux-kernel - Re: [PATCH 5/6] iommu: init pasid array while doing domain

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Message-ID: <71f61d8a-9188-4e67-88ca-e5b48a91e6b5@linux.intel.com>
Date: Thu, 12 Sep 2024 19:22:30 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Joel Granados <j.granados@...sung.com>
Cc: baolu.lu@...ux.intel.com, David Woodhouse <dwmw2@...radead.org>,
 Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, Jason Gunthorpe <jgg@...pe.ca>,
 Kevin Tian <kevin.tian@...el.com>, Klaus Jensen <its@...elevant.dk>,
 linux-kernel@...r.kernel.org, iommu@...ts.linux.dev
Subject: Re: [PATCH 5/6] iommu: init pasid array while doing domain_replace
 and iopf is active

On 2024/9/12 16:25, Joel Granados wrote:
>   /**
>    * iommu_attach_group_handle - Attach an IOMMU domain to an IOMMU group
>    * @domain: IOMMU domain to attach
> diff --git i/drivers/iommu/iommufd/fault.c w/drivers/iommu/iommufd/fault.c
> index ea7f1bf64892..51cb70465b87 100644
> --- i/drivers/iommu/iommufd/fault.c
> +++ w/drivers/iommu/iommufd/fault.c
> @@ -189,8 +189,15 @@ static int iommufd_init_pasid_array(struct iommu_domain *domain,
>   	if (!handle)
>   		return -ENOMEM;
>   	handle->idev = idev;
> +	handle->handle.domain = domain;
> +
> +	mutex_lock(&group->mutex);
> +	ret = xa_insert(&group->pasid_array, IOMMU_NO_PASID, handle, GFP_KERNEL);
> +	mutex_unlock(&group->mutex);
> +
> +	if (ret == -EBUSY)
> +		ret = 0;
>   
> -	ret = iommu_init_pasid_array(domain, group, &handle->handle);
>   	if (ret)
>   		kfree(handle);

This is supposed to be done automatically when an iopf capable domain is
attached to or replaced with a device. Please refer to
iommufd_fault_domain_attach_dev() and
iommufd_fault_domain_replace_dev().

Is there anything preventing this from happening?

Thanks,
baolu