linux-kernel - Re: [PATCH V9 10/10] iommu/vt-d: Report PASID format as domain attribute

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Date:   Thu, 30 Jan 2020 15:54:44 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     Yi Liu <yi.l.liu@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Eric Auger <eric.auger@...hat.com>
Subject: Re: [PATCH V9 10/10] iommu/vt-d: Report PASID format as domain
 attribute

Hi,

On 2020/1/29 14:01, Jacob Pan wrote:
> Report the domain attribute of PASID table format. As multiple formats
> of PASID table entry are supported, it is important for the guest to
> know which format to use in virtual IOMMU. The result will be used for
> binding device with guest PASID.
> 
> Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>   drivers/iommu/intel-iommu.c | 22 ++++++++++++++++++++++
>   include/linux/iommu.h       |  1 +
>   2 files changed, 23 insertions(+)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 2f0bf7cc70ce..b3778e86dc32 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -6413,6 +6413,27 @@ intel_iommu_domain_set_attr(struct iommu_domain *domain,
>   	return ret;
>   }
>   
> +static int intel_iommu_domain_get_attr(struct iommu_domain *domain,
> +				       enum iommu_attr attr, void *data)
> +{
> +	/* Only used for guest */
> +	switch (domain->type) {
> +	case IOMMU_DOMAIN_DMA:
> +		return -ENODEV;
> +	case IOMMU_DOMAIN_UNMANAGED:
> +		switch (attr) {
> +		case DOMAIN_ATTR_PASID_FORMAT:
> +			*(int *)data = IOMMU_PASID_FORMAT_INTEL_VTD;
> +			return 0;
> +		default:
> +			return -ENODEV;
> +		}
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
>   const struct iommu_ops intel_iommu_ops = {
>   	.capable		= intel_iommu_capable,
>   	.domain_alloc		= intel_iommu_domain_alloc,
> @@ -6432,6 +6453,7 @@ const struct iommu_ops intel_iommu_ops = {
>   	.put_resv_regions	= intel_iommu_put_resv_regions,
>   	.apply_resv_region	= intel_iommu_apply_resv_region,
>   	.device_group		= pci_device_group,
> +	.domain_get_attr	= intel_iommu_domain_get_attr,
>   	.dev_has_feat		= intel_iommu_dev_has_feat,
>   	.dev_feat_enabled	= intel_iommu_dev_feat_enabled,
>   	.dev_enable_feat	= intel_iommu_dev_enable_feat,
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index f2223cbb5fd5..9718c109ea0a 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -126,6 +126,7 @@ enum iommu_attr {
>   	DOMAIN_ATTR_FSL_PAMUV1,
>   	DOMAIN_ATTR_NESTING,	/* two stages of translation */
>   	DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
> +	DOMAIN_ATTR_PASID_FORMAT,
>   	DOMAIN_ATTR_MAX,
>   };

Need to separate the new domain attribution definition and the vt-d
implementation.

Best regards,
baolu