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authorJoerg Roedel <joro@8bytes.org>2012-12-02 15:35:37 +0100
committerJoerg Roedel <joro@8bytes.org>2012-12-02 16:07:38 +0100
commit954e3dd8308501bb00cae4ed655968282dc65314 (patch)
tree09bc84f6fc5a2907d637a48e82e36671317afd55 /drivers/iommu/amd_iommu.c
parent78bfa9f395f6bbab168b83f69b99659818517b02 (diff)
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>
Diffstat (limited to 'drivers/iommu/amd_iommu.c')
-rw-r--r--drivers/iommu/amd_iommu.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index cb63cc5d94d7..98d74ab564b6 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);