[PATCH v2 3/3] fuzz: move some DMA hooks

[Alexander Bulekov <alxndr@bu.edu>]

For the sparse-mem device, we want the fuzzer to populate entire DMA
reads from sparse-mem, rather than hooking into the individual MMIO
memory_region_dispatch_read operations. Otherwise, the fuzzer will treat
each sequential read separately (and populate it with a separate
pattern). Work around this by rearranging some DMA hooks. Since the
fuzzer has it's own logic to skip accidentally writing to MMIO regions,
we can call the DMA cb, outside the flatview_translate loop.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
---
 softmmu/memory.c  | 1 -
 softmmu/physmem.c | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/softmmu/memory.c b/softmmu/memory.c
index 874a8fccde..3b8e428064 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1440,7 +1440,6 @@ MemTxResult memory_region_dispatch_read(MemoryRegion *mr,
     unsigned size = memop_size(op);
     MemTxResult r;
 
-    fuzz_dma_read_cb(addr, size, mr);
     if (!memory_region_access_valid(mr, addr, size, false, attrs)) {
         *pval = unassigned_mem_read(mr, addr, size);
         return MEMTX_DECODE_ERROR;
diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index 7e8b0fab89..6a58c86750 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -2831,6 +2831,7 @@ MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
     bool release_lock = false;
     uint8_t *buf = ptr;
 
+    fuzz_dma_read_cb(addr, len, mr);
     for (;;) {
         if (!memory_access_is_direct(mr, false)) {
             /* I/O case */
@@ -2841,7 +2842,6 @@ MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
             stn_he_p(buf, l, val);
         } else {
             /* RAM case */
-            fuzz_dma_read_cb(addr, len, mr);
             ram_ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l, false);
             memcpy(buf, ram_ptr, l);
         }
-- 
2.28.0