[PATCH 5.4 371/434] iommu/vt-d: Allocate reserved region for ISA with correct permission

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>

commit cde9319e884eb6267a0df446f3c131fe1108defb upstream.

Currently the reserved region for ISA is allocated with no
permissions. If a dma domain is being used, mapping this region will
fail. Set the permissions to DMA_PTE_READ|DMA_PTE_WRITE.

Cc: Joerg Roedel <jroedel@xxxxxxx>
Cc: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx # v5.3+
Fixes: d850c2ee5fe2 ("iommu/vt-d: Expose ISA direct mapping region via iommu_get_resv_regions")
Signed-off-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
Acked-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/iommu/intel-iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5697,7 +5697,7 @@ static void intel_iommu_get_resv_regions
 		struct pci_dev *pdev = to_pci_dev(device);
 
 		if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) {
-			reg = iommu_alloc_resv_region(0, 1UL << 24, 0,
+			reg = iommu_alloc_resv_region(0, 1UL << 24, prot,
 						   IOMMU_RESV_DIRECT_RELAXABLE);
 			if (reg)
 				list_add_tail(&reg->list, head);