[Qemu-devel] [RFC PATCH v2 03/17] fuzz: Keep memory mapped for fork-based fuzzer

[Oleinik, Alexander]

Otherwise, the RAM is unmapped from the child-processes, which breaks
any fuzz tests relying on DMA.

Signed-off-by: Alexander Oleinik <address@hidden>
---
 exec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/exec.c b/exec.c
index 3e78de3b8f..b3b56db8f0 100644
--- a/exec.c
+++ b/exec.c
@@ -2317,7 +2317,9 @@ static void ram_block_add(RAMBlock *new_block, Error 
**errp, bool shared)
         qemu_ram_setup_dump(new_block->host, new_block->max_length);
         qemu_madvise(new_block->host, new_block->max_length, 
QEMU_MADV_HUGEPAGE);
         /* MADV_DONTFORK is also needed by KVM in absence of synchronous MMU */
+#ifndef CONFIG_FUZZ /* This conflicts with fork-based fuzzing */
         qemu_madvise(new_block->host, new_block->max_length, 
QEMU_MADV_DONTFORK);
+#endif
         ram_block_notify_add(new_block->host, new_block->max_length);
     }
 }
-- 
2.20.1