Commit 2cd1311a authored by Lu Baolu's avatar Lu Baolu Committed by Joerg Roedel
Browse files

iommu/vt-d: Add set domain DOMAIN_ATTR_NESTING attr 



This adds the Intel VT-d specific callback of setting
DOMAIN_ATTR_NESTING domain attribution. It is necessary
to let the VT-d driver know that the domain represents
a virtual machine which requires the IOMMU hardware to
support nested translation mode. Return success if the
IOMMU hardware suports nested mode, otherwise failure.

Signed-off-by: default avatarYi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent a1948f2e

drivers/iommu/intel-iommu.c

+56 −0
Original line number Diff line number Diff line
@@ -315,6 +315,12 @@ static int hw_pass_through = 1; 
 */

#define DOMAIN_FLAG_USE_FIRST_LEVEL		BIT(2)



/*

 * Domain represents a virtual machine which demands iommu nested

 * translation mode support.

 */

#define DOMAIN_FLAG_NESTING_MODE		BIT(3)



#define for_each_domain_iommu(idx, domain)			\

	for (idx = 0; idx < g_num_of_iommus; idx++)		\

		if (domain->iommu_refcnt[idx])
@@ -5640,6 +5646,24 @@ static inline bool iommu_pasid_support(void) 
	return ret;

}



static inline bool nested_mode_support(void)

{

	struct dmar_drhd_unit *drhd;

	struct intel_iommu *iommu;

	bool ret = true;



	rcu_read_lock();

	for_each_active_iommu(iommu, drhd) {

		if (!sm_supported(iommu) || !ecap_nest(iommu->ecap)) {

			ret = false;

			break;

		}

	}

	rcu_read_unlock();



	return ret;

}



static bool intel_iommu_capable(enum iommu_cap cap)

{

	if (cap == IOMMU_CAP_CACHE_COHERENCY)
@@ -6018,10 +6042,42 @@ static bool intel_iommu_is_attach_deferred(struct iommu_domain *domain, 
	return dev->archdata.iommu == DEFER_DEVICE_DOMAIN_INFO;

}



static int

intel_iommu_domain_set_attr(struct iommu_domain *domain,

			    enum iommu_attr attr, void *data)

{

	struct dmar_domain *dmar_domain = to_dmar_domain(domain);

	unsigned long flags;

	int ret = 0;



	if (domain->type != IOMMU_DOMAIN_UNMANAGED)

		return -EINVAL;



	switch (attr) {

	case DOMAIN_ATTR_NESTING:

		spin_lock_irqsave(&device_domain_lock, flags);

		if (nested_mode_support() &&

		    list_empty(&dmar_domain->devices)) {

			dmar_domain->flags |= DOMAIN_FLAG_NESTING_MODE;

			dmar_domain->flags &= ~DOMAIN_FLAG_USE_FIRST_LEVEL;

		} else {

			ret = -ENODEV;

		}

		spin_unlock_irqrestore(&device_domain_lock, flags);

		break;

	default:

		ret = -EINVAL;

		break;

	}



	return ret;

}



const struct iommu_ops intel_iommu_ops = {

	.capable		= intel_iommu_capable,

	.domain_alloc		= intel_iommu_domain_alloc,

	.domain_free		= intel_iommu_domain_free,

	.domain_set_attr	= intel_iommu_domain_set_attr,

	.attach_dev		= intel_iommu_attach_device,

	.detach_dev		= intel_iommu_detach_device,

	.aux_attach_dev		= intel_iommu_aux_attach_device,

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