Commit 9838f2bb authored by Yi Liu's avatar Yi Liu Committed by Jason Gunthorpe
Browse files

iommu/vt-d: Set the nested domain to a device 

This adds the helper for setting the nested domain to a device hence
enable nested domain usage on Intel VT-d.

Link: https://lore.kernel.org/r/20231026044216.64964-7-yi.l.liu@intel.com


Signed-off-by: default avatarJacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarYi Liu <yi.l.liu@intel.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
parent d86724d4

drivers/iommu/intel/nested.c

+54 −0
Original line number Diff line number Diff line
@@ -12,8 +12,61 @@ 
#define pr_fmt(fmt)	"DMAR: " fmt



#include <linux/iommu.h>

#include <linux/pci.h>

#include <linux/pci-ats.h>



#include "iommu.h"

#include "pasid.h"



static int intel_nested_attach_dev(struct iommu_domain *domain,

				   struct device *dev)

{

	struct device_domain_info *info = dev_iommu_priv_get(dev);

	struct dmar_domain *dmar_domain = to_dmar_domain(domain);

	struct intel_iommu *iommu = info->iommu;

	unsigned long flags;

	int ret = 0;



	if (info->domain)

		device_block_translation(dev);



	if (iommu->agaw < dmar_domain->s2_domain->agaw) {

		dev_err_ratelimited(dev, "Adjusted guest address width not compatible\n");

		return -ENODEV;

	}



	/*

	 * Stage-1 domain cannot work alone, it is nested on a s2_domain.

	 * The s2_domain will be used in nested translation, hence needs

	 * to ensure the s2_domain is compatible with this IOMMU.

	 */

	ret = prepare_domain_attach_device(&dmar_domain->s2_domain->domain, dev);

	if (ret) {

		dev_err_ratelimited(dev, "s2 domain is not compatible\n");

		return ret;

	}



	ret = domain_attach_iommu(dmar_domain, iommu);

	if (ret) {

		dev_err_ratelimited(dev, "Failed to attach domain to iommu\n");

		return ret;

	}



	ret = intel_pasid_setup_nested(iommu, dev,

				       IOMMU_NO_PASID, dmar_domain);

	if (ret) {

		domain_detach_iommu(dmar_domain, iommu);

		dev_err_ratelimited(dev, "Failed to setup pasid entry\n");

		return ret;

	}



	info->domain = dmar_domain;

	spin_lock_irqsave(&dmar_domain->lock, flags);

	list_add(&info->link, &dmar_domain->devices);

	spin_unlock_irqrestore(&dmar_domain->lock, flags);



	return 0;

}



static void intel_nested_domain_free(struct iommu_domain *domain)

{
@@ -21,6 +74,7 @@ static void intel_nested_domain_free(struct iommu_domain *domain) 
}



static const struct iommu_domain_ops intel_nested_domain_ops = {

	.attach_dev		= intel_nested_attach_dev,

	.free			= intel_nested_domain_free,

};