iommu/amd: Don't use 512GB pages
There is a bug in the hardware that will be triggered when
this page size is used. Make sure this does not happen.
Signed-off-by: Joerg Roedel <joro@8bytes.org>
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index cb63cc5..98d74ab 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -66,8 +66,10 @@
*
* If at some point we'd like to utilize the IOMMU core's new behavior,
* we could change this to advertise the real page sizes we support.
+ *
+ * 512GB Pages are not supported due to a hardware bug
*/
-#define AMD_IOMMU_PGSIZES (~0xFFFUL)
+#define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38))
static DEFINE_RWLOCK(amd_iommu_devtable_lock);
