x86, AMD IOMMU: initialize device table properly
This patch adds device table initializations which forbids memory accesses
for devices per default and disables all page faults.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index d9a9da5..ceba338 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -801,6 +801,21 @@
}
/*
+ * Init the device table to not allow DMA access for devices and
+ * suppress all page faults
+ */
+static void init_device_table(void)
+{
+ u16 devid;
+
+ for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
+ set_dev_entry_bit(devid, DEV_ENTRY_VALID);
+ set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
+ set_dev_entry_bit(devid, DEV_ENTRY_NO_PAGE_FAULT);
+ }
+}
+
+/*
* This function finally enables all IOMMUs found in the system after
* they have been initialized
*/
@@ -931,6 +946,9 @@
if (amd_iommu_pd_alloc_bitmap == NULL)
goto free;
+ /* init the device table */
+ init_device_table();
+
/*
* let all alias entries point to itself
*/