Messages in this thread | | | Subject | Re: [PATCH] iommu/vt-d: Allocate reserved region for ISA with correct permission | From | Lu Baolu <> | Date | Sun, 15 Dec 2019 13:39:31 +0800 |
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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@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>
This fix looks reasonable to me.
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
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(®->list, head); >
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