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iommu/vt-d: Handle RMRR with PCI bridge device scopes 

When reading the vtd specification and especially the
Reserved Memory Region Reporting Structure chapter,
it is not obvious a device scope element cannot be a
PCI-PCI bridge, in which case all downstream ports are
likely to access the reserved memory region. Let's handle
this case in device_has_rmrr.

Fixes: ea2447f700 ("intel-iommu: Prevent devices with RMRRs from being placed into SI Domain")

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Eric Auger 2019-06-03 08:53:33 +02:00 committed by Joerg Roedel
parent b9a7f98164
commit e143fd4598
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/intel-iommu.c
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@ -2880,7 +2880,8 @@ static bool device_has_rmrr(struct device *dev)
*/
for_each_active_dev_scope(rmrr->devices,
rmrr->devices_cnt, i, tmp)
if (tmp == dev) {
if (tmp == dev ||
is_downstream_to_pci_bridge(dev, tmp)) {
rcu_read_unlock();
return true;
}