Commit b3e9b515 authored by Singh, Brijesh's avatar Singh, Brijesh Committed by Joerg Roedel

iommu/amd: Clear memory encryption mask from physical address

Boris Ostrovsky reported a memory leak with device passthrough when SME
is active.

The VFIO driver uses iommu_iova_to_phys() to get the physical address for
an iova. This physical address is later passed into vfio_unmap_unpin() to
unpin the memory. The vfio_unmap_unpin() uses pfn_valid() before unpinning
the memory. The pfn_valid() check was failing because encryption mask was
part of the physical address returned. This resulted in the memory not
being unpinned and therefore leaked after the guest terminates.

The memory encryption mask must be cleared from the physical address in
iommu_iova_to_phys().

Fixes: 2543a786 ("iommu/amd: Allow the AMD IOMMU to work with memory encryption")
Reported-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: <iommu@lists.linux-foundation.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: kvm@vger.kernel.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: <stable@vger.kernel.org> # 4.14+
Signed-off-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 17b57b18
...@@ -3069,7 +3069,7 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, ...@@ -3069,7 +3069,7 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
return 0; return 0;
offset_mask = pte_pgsize - 1; offset_mask = pte_pgsize - 1;
__pte = *pte & PM_ADDR_MASK; __pte = __sme_clr(*pte & PM_ADDR_MASK);
return (__pte & ~offset_mask) | (iova & offset_mask); return (__pte & ~offset_mask) | (iova & offset_mask);
} }
......
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