From: Jerry Snitselaar jsnitsel@redhat.com
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@suse.de Cc: Lu Baolu baolu.lu@linux.intel.com Cc: iommu@lists.linux-foundation.org Cc: stable@vger.kernel.org # v5.3+ Fixes: d850c2ee5fe2 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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(®->list, head);