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iommu/vt-d: Fix a bug in intel_iommu_iova_to_phys() for huge page 

commit 77a1bce84b 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>
This commit is contained in:
Yonghyun Hwang 2020-02-26 12:30:06 -08:00 committed by Greg Kroah-Hartman
parent 28ffabf65e
commit 8159e369d1
1 changed files with 4 additions and 2 deletions
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6
drivers/iommu/intel-iommu.c
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@ -5524,8 +5524,10 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
u64 phys = 0; u64 phys = 0;
pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level); pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level);
if (pte) if (pte && dma_pte_present(pte))
phys = dma_pte_addr(pte); phys = dma_pte_addr(pte) +
(iova & (BIT_MASK(level_to_offset_bits(level) +
VTD_PAGE_SHIFT) - 1));
return phys; return phys;
} }