iommu/vt-d: Fix a bug in intel_iommu_iova_to_phys() for huge page
commit77a1bce84b
upstream. intel_iommu_iova_to_phys() has a bug when it translates an IOVA for a huge page onto its corresponding physical address. This commit fixes the bug by accomodating the level of page entry for the IOVA and adds IOVA's lower address to the physical address. Cc: <stable@vger.kernel.org> Acked-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Moritz Fischer <mdf@kernel.org> Signed-off-by: Yonghyun Hwang <yonghyun@google.com> Fixes:3871794642
("VT-d: Changes to support KVM") Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -5524,8 +5524,10 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
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u64 phys = 0;
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pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level);
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if (pte)
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phys = dma_pte_addr(pte);
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if (pte && dma_pte_present(pte))
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phys = dma_pte_addr(pte) +
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(iova & (BIT_MASK(level_to_offset_bits(level) +
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VTD_PAGE_SHIFT) - 1));
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return phys;
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}
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