AMD IOMMU: allocate a new protection for hotplugged devices

Impact: also hotplug devices benefit from device isolation

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index f295654..f226060 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -923,6 +923,8 @@ static int device_change_notifier(struct notifier_block *nb,
        struct protection_domain *domain;
        struct dma_ops_domain *dma_domain;
        struct amd_iommu *iommu;
+       int order = amd_iommu_aperture_order;
+       unsigned long flags;
 
        if (devid > amd_iommu_last_bdf)
                goto out;
@@ -954,6 +956,21 @@ static int device_change_notifier(struct notifier_block *nb,
                if (!domain)
                        goto out;
                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;
        default:
                goto out;