memory: Add permissions in IOMMUAccessFlags

This will be necessary for devices implementing ATS.
We also define a new macro IOMMU_ACCESS_FLAG_FULL in addition to
IOMMU_ACCESS_FLAG to support more access flags.
IOMMU_ACCESS_FLAG is kept for convenience and backward compatibility.

Here are the flags added (defined by the PCIe 5 specification) :
    - Execute Requested
    - Privileged Mode Requested
    - Global
    - Untranslated Only

IOMMU_ACCESS_FLAG sets the additional flags to 0

Signed-off-by: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
Message-Id: <20250628180226.133285-3-clement.mathieu--drif@eviden.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 21 insertions, 2 deletions

diff --git a/include/system/memory.h b/include/system/memory.h
index 46248d4a52..1672622d70 100644
--- a/include/system/memory.h
+++ b/include/system/memory.h
@@ -109,15 +109,34 @@ struct MemoryRegionSection {
 
 typedef struct IOMMUTLBEntry IOMMUTLBEntry;
 
-/* See address_space_translate: bit 0 is read, bit 1 is write.  */
+/*
+ * See address_space_translate:
+ *      - bit 0 : read
+ *      - bit 1 : write
+ *      - bit 2 : exec
+ *      - bit 3 : priv
+ *      - bit 4 : global
+ *      - bit 5 : untranslated only
+ */
 typedef enum {
     IOMMU_NONE = 0,
     IOMMU_RO   = 1,
     IOMMU_WO   = 2,
     IOMMU_RW   = 3,
+    IOMMU_EXEC = 4,
+    IOMMU_PRIV = 8,
+    IOMMU_GLOBAL = 16,
+    IOMMU_UNTRANSLATED_ONLY = 32,
 } IOMMUAccessFlags;
 
-#define IOMMU_ACCESS_FLAG(r, w) (((r) ? IOMMU_RO : 0) | ((w) ? IOMMU_WO : 0))
+#define IOMMU_ACCESS_FLAG(r, w)     (((r) ? IOMMU_RO : 0) | \
+                                    ((w) ? IOMMU_WO : 0))
+#define IOMMU_ACCESS_FLAG_FULL(r, w, x, p, g, uo) \
+                                    (IOMMU_ACCESS_FLAG(r, w) | \
+                                    ((x) ? IOMMU_EXEC : 0) | \
+                                    ((p) ? IOMMU_PRIV : 0) | \
+                                    ((g) ? IOMMU_GLOBAL : 0) | \
+                                    ((uo) ? IOMMU_UNTRANSLATED_ONLY : 0))
 
 struct IOMMUTLBEntry {
     AddressSpace    *target_as;