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AMD IOMMU: allocate a new protection for hotplugged devices

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Impact: also hotplug devices benefit from device isolation

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel
2008-12-10 19:33:26 +01:00
parent e2dc14a2a6
commit 1ac4cbbc5e
1 changed files with 17 additions and 0 deletions
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17
arch/x86/kernel/amd_iommu.c
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@@ -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;