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iommu/vt-d: Match CPU and IOMMU paging mode 

When setting up first level page tables for sharing with CPU, we need
to ensure IOMMU can support no less than the levels supported by the
CPU.

It is not adequate, as in the current code, to set up 5-level paging
in PASID entry First Level Paging Mode(FLPM) solely based on CPU.

Currently, intel_pasid_setup_first_level() is only used by native SVM
code which already checks paging mode matches. However, future use of
this helper function may not be limited to native SVM.
https://lkml.org/lkml/2019/11/18/1037

Fixes: 437f35e1cd ("iommu/vt-d: Add first level page table interface")
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jacob Pan 2020-01-02 08:18:04 +08:00 committed by Joerg Roedel
parent ff3dc6521f
commit 79db7e1b4c
1 changed files with 10 additions and 2 deletions
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10
drivers/iommu/intel-pasid.c
View File

@ -499,8 +499,16 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu,
}
#ifdef CONFIG_X86
if (cpu_feature_enabled(X86_FEATURE_LA57))
/* Both CPU and IOMMU paging mode need to match */
if (cpu_feature_enabled(X86_FEATURE_LA57)) {
if (cap_5lp_support(iommu->cap)) {
pasid_set_flpm(pte, 1);
} else {
pr_err("VT-d has no 5-level paging support for CPU\n");
pasid_clear_entry(pte);
return -EINVAL;
}
}
#endif /* CONFIG_X86 */
pasid_set_domain_id(pte, did);