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iommu/vt-d: Add a check for 1GB page support

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Add a check to verify IOMMU 1GB page support. If the CPU supports 1GB
pages but the IOMMU does not support it then disable SVM by not
allocating PASID tables.

Signed-off-by: Sohil Mehta <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
This commit is contained in:
Sohil Mehta 2017-12-20 11:59:25 -08:00 • committed by Joerg Roedel
commit 59103caa68
2 changed files with 5 additions and 0 deletions
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4
drivers/iommu/intel-svm.c
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@ -41,6 +41,10 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
struct page *pages;
int order;
if (cpu_feature_enabled(X86_FEATURE_GBPAGES) &&
!cap_fl1gp_support(iommu->cap))
return -EINVAL;
/* Start at 2 because it's defined as 2^(1+PSS) */
iommu->pasid_max = 2 << ecap_pss(iommu->ecap);