We have that now, so why not use it.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hw/i386/intel_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index b477143..3240e5d 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1010,7 +1010,7 @@ out:
     entry->iova = addr & page_mask;
     entry->translated_addr = vtd_get_slpte_addr(slpte) & page_mask;
     entry->addr_mask = ~page_mask;
-    entry->perm = (writes ? 2 : 0) + (reads ? 1 : 0);
+    entry->perm = IOMMU_ACCESS_FLAG(reads, writes);
 }
 
 static void vtd_root_table_setup(IntelIOMMUState *s)
-- 
2.7.4