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SubjectRe: [PATCH] iommu/vt-d: Allocate reserved region for ISA with correct permission
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Hi Jerry,

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@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>
> ---
> 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);


This also applies to the IOAPIC range. Can you please change them
together?

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0c8d81f56a30..256e48434f68 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);
@@ -5746,7 +5746,7 @@ static void intel_iommu_get_resv_regions(struct
device *device,

reg = iommu_alloc_resv_region(IOAPIC_RANGE_START,
IOAPIC_RANGE_END -
IOAPIC_RANGE_START + 1,
- 0, IOMMU_RESV_MSI);
+ prot, IOMMU_RESV_MSI);
if (!reg)
return;
list_add_tail(&reg->list, head);
Best regards,
baolu

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

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