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Commit 1ac4cbbc authored by Joerg Roedel's avatar Joerg Roedel
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AMD IOMMU: allocate a new protection for hotplugged devices 



Impact: also hotplug devices benefit from device isolation

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent e2dc14a2

arch/x86/kernel/amd_iommu.c

+17 −0
Original line number Original line Diff line number Diff line
@@ -923,6 +923,8 @@ static int device_change_notifier(struct notifier_block *nb, 
	struct protection_domain *domain;

	struct protection_domain *domain;

	struct dma_ops_domain *dma_domain;

	struct dma_ops_domain *dma_domain;

	struct amd_iommu *iommu;

	struct amd_iommu *iommu;

	int order = amd_iommu_aperture_order;

	unsigned long flags;





	if (devid > amd_iommu_last_bdf)

	if (devid > amd_iommu_last_bdf)

		goto out;

		goto out;
@@ -954,6 +956,21 @@ static int device_change_notifier(struct notifier_block *nb, 
		if (!domain)

		if (!domain)

			goto out;

			goto out;

		detach_device(domain, devid);

		detach_device(domain, devid);

		break;

	case BUS_NOTIFY_ADD_DEVICE:

		/* allocate a protection domain if a device is added */

		dma_domain = find_protection_domain(devid);

		if (dma_domain)

			goto out;

		dma_domain = dma_ops_domain_alloc(iommu, order);

		if (!dma_domain)

			goto out;

		dma_domain->target_dev = devid;



		spin_lock_irqsave(&iommu_pd_list_lock, flags);

		list_add_tail(&dma_domain->list, &iommu_pd_list);

		spin_unlock_irqrestore(&iommu_pd_list_lock, flags);



		break;

		break;

	default:

	default:

		goto out;

		goto out;