Commit a97590e5 authored by Alex Williamson's avatar Alex Williamson Committed by David Woodhouse

intel-iommu: Unlink domain from iommu

When we remove a device, we unlink the iommu from the domain, but
we never do the reverse unlinking of the domain from the iommu.
This means that we never clear iommu->domain_ids, eventually leading
to resource exhaustion if we repeatedly bind and unbind a device
to a driver.  Also free empty domains to avoid a resource leak.
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Acked-by: default avatarDonald Dutile <ddutile@redhat.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org
parent 7a661013
...@@ -3260,9 +3260,15 @@ static int device_notifier(struct notifier_block *nb, ...@@ -3260,9 +3260,15 @@ static int device_notifier(struct notifier_block *nb,
if (!domain) if (!domain)
return 0; return 0;
if (action == BUS_NOTIFY_UNBOUND_DRIVER && !iommu_pass_through) if (action == BUS_NOTIFY_UNBOUND_DRIVER && !iommu_pass_through) {
domain_remove_one_dev_info(domain, pdev); domain_remove_one_dev_info(domain, pdev);
if (!(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) &&
!(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) &&
list_empty(&domain->devices))
domain_exit(domain);
}
return 0; return 0;
} }
...@@ -3411,6 +3417,11 @@ static void domain_remove_one_dev_info(struct dmar_domain *domain, ...@@ -3411,6 +3417,11 @@ static void domain_remove_one_dev_info(struct dmar_domain *domain,
domain->iommu_count--; domain->iommu_count--;
domain_update_iommu_cap(domain); domain_update_iommu_cap(domain);
spin_unlock_irqrestore(&domain->iommu_lock, tmp_flags); spin_unlock_irqrestore(&domain->iommu_lock, tmp_flags);
spin_lock_irqsave(&iommu->lock, tmp_flags);
clear_bit(domain->id, iommu->domain_ids);
iommu->domains[domain->id] = NULL;
spin_unlock_irqrestore(&iommu->lock, tmp_flags);
} }
spin_unlock_irqrestore(&device_domain_lock, flags); spin_unlock_irqrestore(&device_domain_lock, flags);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment