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authorSohil Mehta <sohil.mehta@intel.com>2017-12-20 22:59:25 +0300
committerJoerg Roedel <jroedel@suse.de>2018-01-17 17:02:50 +0300
commit59103caa6839592788e7ad58b35863aac034631a (patch)
treeb645989c4381eb78047b628f04be37a602c08538 /drivers/iommu
parent5e3b4a15dd8da6bded2092694c8db3b505cbf711 (diff)
downloadlinux-59103caa6839592788e7ad58b35863aac034631a.tar.xz
iommu/vt-d: Add a check for 1GB page support
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 <sohil.mehta@intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel-svm.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 6643277e321e..e9a56ad09a76 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -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);