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From:   Jerry Snitselaar <jsnitsel@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     Joerg Roedel <jroedel@suse.de>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        iommu@lists.linux-foundation.org, stable@vger.kernel.org
Subject: [PATCH] iommu/vt-d: Allocate reserved region for ISA with correct permission
Date:   Thu, 12 Dec 2019 22:36:42 -0700
Message-Id: <20191213053642.5696-1-jsnitsel@redhat.com>
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Sender: linux-kernel-owner@vger.kernel.org
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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@suse.de>
Cc: Lu Baolu <baolu.lu@linux.intel.com>=20
Cc: iommu@lists.linux-foundation.org
Cc: stable@vger.kernel.org # v5.3+
Fixes: d850c2ee5fe2 ("iommu/vt-d: Expose ISA direct mapping region via io=
mmu_get_resv_regions")
Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
---
 drivers/iommu/intel-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0c8d81f56a30..998529cebcf2 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5736,7 +5736,7 @@ static void intel_iommu_get_resv_regions(struct dev=
ice *device,
 		struct pci_dev *pdev =3D to_pci_dev(device);
=20
 		if ((pdev->class >> 8) =3D=3D PCI_CLASS_BRIDGE_ISA) {
-			reg =3D iommu_alloc_resv_region(0, 1UL << 24, 0,
+			reg =3D iommu_alloc_resv_region(0, 1UL << 24, prot,
 						      IOMMU_RESV_DIRECT);
 			if (reg)
 				list_add_tail(&reg->list, head);
--=20
2.24.0