2 files changed, 3 insertions, 1 deletions

diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index 4862a5be899c..1c769f4e6cdf 100644
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -203,6 +203,7 @@ struct protection_domain {
         int mode;               /* paging mode (0-6 levels) */
         u64 *pt_root;           /* page table root pointer */
         unsigned long flags;    /* flags to find out type of domain */
+        unsigned dev_cnt;       /* devices assigned to this domain */
         void *priv;             /* private data */
 };
 
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 5c465c91150e..8b45bc49d1c5 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -825,9 +825,10 @@ static void set_device_domain(struct amd_iommu *iommu,
                               u16 devid)
 {
         unsigned long flags;
-
         u64 pte_root = virt_to_phys(domain->pt_root);
 
+        domain->dev_cnt += 1;
+
         pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
                     << DEV_ENTRY_MODE_SHIFT;
         pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV;