redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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>
5.4-rM2-2.2.x-imx-squashed
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/iommu/intel-iommu.c
View File

@ -5524,8 +5524,10 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
u64 phys = 0;
pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level);
if (pte)
phys = dma_pte_addr(pte);
if (pte && dma_pte_present(pte))
phys = dma_pte_addr(pte) +
(iova & (BIT_MASK(level_to_offset_bits(level) +
VTD_PAGE_SHIFT) - 1));
return phys;
}