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

[Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>]

Hi,

On 12/13/19 1:36 PM, Jerry Snitselaar wrote:
> 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>

This fix looks reasonable to me.

Acked-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Best regards,
baolu

> ---
>   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 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);
>   			if (reg)
>   				list_add_tail(&reg->list, head);