Commit cde9319e authored Dec 12, 2019 by Jerry Snitselaar Committed by Joerg Roedel Dec 17, 2019

iommu/vt-d: Allocate reserved region for ISA with correct permission

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>
Cc: iommu@lists.linux-foundation.org
Cc: stable@vger.kernel.org # v5.3+
Fixes: d850c2ee ("iommu/vt-d: Expose ISA direct mapping region via iommu_get_resv_regions")
Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

parent d3602115

drivers/iommu/intel-iommu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -5728,7 +5728,7 @@ static void intel_iommu_get_resv_regions(struct device *device,
		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);

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