memory: tune last param of iommu_ops.translate()

This patch converts the old "is_write" bool into IOMMUAccessFlags. The
difference is that "is_write" can only express either read/write, but
sometimes what we really want is "none" here (neither read nor write).
Replay is an good example - during replay, we should not check any RW
permission bits since thats not an actual IO at all.

CC: Paolo Bonzini <pbonzini@redhat.com>
CC: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 99e0f54d86..97fd0c242b 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -185,8 +185,14 @@ struct MemoryRegionOps {
 typedef struct MemoryRegionIOMMUOps MemoryRegionIOMMUOps;
 
 struct MemoryRegionIOMMUOps {
-    /* Return a TLB entry that contains a given address. */
-    IOMMUTLBEntry (*translate)(MemoryRegion *iommu, hwaddr addr, bool is_write);
+    /*
+     * Return a TLB entry that contains a given address. Flag should
+     * be the access permission of this translation operation. We can
+     * set flag to IOMMU_NONE to mean that we don't need any
+     * read/write permission checks, like, when for region replay.
+     */
+    IOMMUTLBEntry (*translate)(MemoryRegion *iommu, hwaddr addr,
+                               IOMMUAccessFlags flag);
     /* Returns minimum supported page size */
     uint64_t (*get_min_page_size)(MemoryRegion *iommu);
     /* Called when IOMMU Notifier flag changed */