x86/amd-iommu: Protect IOMMU-API map/unmap path
This patch introduces a mutex to lock page table updates in
the IOMMU-API path. We can't use the spin_lock here because
this patch might sleep.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index ba19ad4..5e46e78 100644
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -21,6 +21,7 @@
#define _ASM_X86_AMD_IOMMU_TYPES_H
#include <linux/types.h>
+#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/spinlock.h>
@@ -237,6 +238,7 @@
struct list_head list; /* for list of all protection domains */
struct list_head dev_list; /* List of all devices in this domain */
spinlock_t lock; /* mostly used to lock the page table*/
+ struct mutex api_lock; /* protect page tables in the iommu-api path */
u16 id; /* the domain id written to the device table */
int mode; /* paging mode (0-6 levels) */
u64 *pt_root; /* page table root pointer */