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

In the case the RMRR device scope is a PCI-PCI bridge, let's check
the device belongs to the PCI sub-hierarchy.

Fixes: 0659b8dc45a6 ("iommu/vt-d: Implement reserved region get/put callbacks")

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>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0d7d177673dd..5de48ed1f763 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5426,7 +5426,8 @@ static void intel_iommu_get_resv_regions(struct device *device,
                         struct iommu_resv_region *resv;
                         size_t length;
 
-                        if (i_dev != device)
+                        if (i_dev != device &&
+                            !is_downstream_to_pci_bridge(device, i_dev))
                                 continue;
 
                         length = rmrr->end_address - rmrr->base_address + 1;