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iommu/vt-d: Add nested translation helper function

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Nested translation mode is supported in VT-d 3.0 Spec.CH 3.8.
With PASID granular translation type set to 0x11b, translation
result from the first level(FL) also subject to a second level(SL)
page table translation. This mode is used for SVA virtualization,
where FL performs guest virtual to guest physical translation and
SL performs guest physical to host physical translation.

This patch adds a helper function for setting up nested translation
where second level comes from a domain and first level comes from
a guest PGD.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20200516062101.29541-4-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jacob Pan
2020-05-16 14:20:46 +08:00
committed by Joerg Roedel
parent 3aef9ca6a4
commit b0d1f8741b
5 changed files with 206 additions and 28 deletions
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5
include/uapi/linux/iommu.h
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@@ -285,6 +285,11 @@ struct iommu_gpasid_bind_data_vtd {
__u32 emt;
};
#define IOMMU_SVA_VTD_GPASID_MTS_MASK (IOMMU_SVA_VTD_GPASID_CD | \
IOMMU_SVA_VTD_GPASID_EMTE | \
IOMMU_SVA_VTD_GPASID_PCD | \
IOMMU_SVA_VTD_GPASID_PWT)
/**
* struct iommu_gpasid_bind_data - Information about device and guest PASID binding
* @version: Version of this data structure